Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Pedagogiczna Biblioteka Wojewódzka im. Komisji Edukacji Narodowej w Lublinie Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaPedagogiczna Biblioteka Wojewódzka im. Komisji Edukacji Narodowej w Lublinie
Zmień bibliotekę

Wyszukujesz frazę "Reville, B." wg kryterium: Autor

  Lista filtrów
Wyrównaj
Wyświetlanie 1-10 z 41
Tytuł:
X-ray spectral analysis of the jet termination shock in pictor A on subarcsecond scales with Chandra
Autorzy:
Reville, B.
Stawarz, Łukasz
Thimmappa, Rameshan
Neilsen, J.
Ostrowski, Michał
Opis:
Hot spots observed at the edges of extended radio lobes in high-power radio galaxies and quasars mark the position of mildly relativistic termination shock, where the jet bulk kinetic energy is converted to the internal energy of the jet particles. These are the only astrophysical systems where mildly relativistic shocks can be directly resolved at various wavelengths of the electromagnetic spectrum. The western hot spot in the radio galaxy Pictor A is an exceptionally good target in this respect, due to the combination of its angular size and high surface brightness. In our previous work, after a careful Chandra image deconvolution, we resolved this hot spot into a disk-like feature perpendicular to the jet axis, and identified it as the front of the jet termination shock. We argued for a synchrotron origin of the observed X-ray photons, which implied electron energies reaching at least 10–100 TeV at the shock front. Here, we present a follow-up on that analysis, proposing, in particular, a novel method for constraining the shape of the X-ray continuum emission with subarcsecond resolution. The method is based on a Chandra hardness map analysis, using separately deconvolved maps in the soft and hard X-ray bands. In this way, we have found there is a systematic, yet statistically significant gradient in the hardness ratio across the shock, such that the implied electron energy index ranges from s $\leq$ 2.2 at the shock front to s > 2.7 in the near downstream. We discuss the implications of the obtained results for a general understanding of particle acceleration at mildly relativistic shocks.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Giant lobes of Centaurus a radio galaxy observed with the Suzaku X-ray satellite
Autorzy:
Cheung, C. C.
Madejski, G.
Reville, B.
Feain, I. J.
Siemiginowska, A.
Simionescu, A.
Kataoka, J.
Hardcastle, M. J.
Ostrowski, Michał
Takahashi, T.
Takeuchi, Y.
Werner, N.
Tanaka, Y. T.
Stawarz, Łukasz
Fukazawa, Y.
Gandhi, P.
Takei, Y.
O’Sullivan, S. P.
Opis:
We report on Suzaku observations of selected regions within the southern giant lobe of the radio galaxy Centaurus A. In our analysis we focus on distinct X-ray features detected with the X-ray Imaging Spectrometer within the range 0.5-10 keV, some of which are likely associated with fine structure of the lobe revealed by recent high-quality radio intensity and polarization maps. With the available photon statistics, we find that the spectral properties of the detected X-ray features are equally consistent with thermal emission from hot gas with temperatures kT > 1 keV, or with a power-law radiation continuum characterized by photon indices $\Gamma \sim 2.0 \pm 0.5$. However, the plasma parameters implied by these different models favor a synchrotron origin for the analyzed X-ray spots, indicating that a very efficient acceleration of electrons up to $_{\sim }^{>} 10$ TeV energies is taking place within the giant structure of Centaurus A, albeit only in isolated and compact regions associated with extended and highly polarized radio filaments. We also present a detailed analysis of the diffuse X-ray emission filling the whole field of view of the instrument, resulting in a tentative detection of a soft excess component best fitted by a thermal model with a temperature of $\mathit{kT} \sim 0.5$ keV. The exact origin of the observed excess remains uncertain, although energetic considerations point to thermal gas filling the bulk of the volume of the lobe and mixed with the non-thermal plasma, rather than to the alternative scenario involving a condensation of the hot intergalactic medium around the edges of the expanding radio structure. If correct, this would be the first detection of the thermal content of the extended lobes of a radio galaxy in X-rays. The corresponding number density of the thermal gas in such a case is ng $\mathit{n_{g}} \sim 10^{-4} \mathrm{cm}^{-3}$, while its pressure appears to be in almost exact equipartition with the volume-averaged non-thermal pressure provided by the radio-emitting electrons and the lobes' magnetic field. A prominent large-scale fluctuation of the Galactic foreground emission, resulting in excess foreground X-ray emission aligned with the lobe, cannot be ruled out. Although tentative, our findings potentially imply that the structure of the extended lobes in active galaxies is likely to be highly inhomogeneous and non-uniform, with magnetic reconnection and turbulent acceleration processes continuously converting magnetic energy to internal energy of the plasma particles, leading to possibly significant spatial and temporal variations in the plasma \beta parameter around the volume-averaged equilibrium condition \beta.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Constraints on the Intergalactic Magnetic Field using Fermi-LAT and H.E.S.S. Blazar Observations
Autorzy:
Mitchell, A.
Takahashi, T.
Glicenstein, J. F.
Thorpe-Morgan, C.
de Bony, M.
Chibueze, O.
Marx, R.
Funk, S.
Schwanke, U.
Martí-Devesa, G.
Marcowith, A.
de Ona Wilhelmi, E.
Backes, M.
Aharonian, F.
Quirrenbach, A.
Lenain, J. -P.
Lang, R. G.
Ohm, S.
Steinmassl, S.
Mohrmann, L.
Goswami, P.
Malyshev, D.
Venter, C.
Le Stum, S.
Lemière, A.
Kluźniak, W.
Tanaka, T.
Füssling, M.
Jamrozy, Marek
Panter, M.
Jankowsky, F.
Bylund, T.
Wong, Yu Wun
Reimer, A.
Reichherzer, P.
Egberts, K.
Murach, T.
Burger-Scheidlin, C.
White, R.
Leuschner, F.
Chen, A.
Ghafourizadeh, S.
Leitl, F.
Schüssler, F.
Martins, V. Barbosa
Bulik, T.
Sanchez, D. A.
Marchegiani, P.
Breuhaus, M.
Pühlhofer, G.
Aschersleben, J.
Wagner, S. J.
Joshi, V.
Zdziarski, A. A.
Terrier, R.
Uchiyama, Y.
Sasaki, M.
Jung-Richardt, I.
Ruiz-Velasco, E.
Panny, S.
Niemiec, J.
Peron, G.
Bouyahiaoui, M.
Muller, J.
Grondin, M. -H.
Marandon, V.
Rudak, B.
Taylor, A. M.
Holch, T. L.
Horns, D.
Kosack, K.
Montanari, A.
Katarzyński, K.
Sol, H.
Wierzcholska, Alicja
Glawion, D.
Meyer, M.
Celic, J.
Lohse, T.
Brun, F.
Reville, B.
Fontaine, G.
Chandra, S.
Caroff, S.
Zargaryan, D.
Brose, R.
Gabici, S.
Sahakian, V.
Spencer, S.
Lypova, I.
Kostunin, D.
Berge, D.
Mackey, J.
Khatoon, R.
Kasai, E.
Rowell, G.
Suzuki, H.
Punch, M.
Parsons, R. D.
Tsuji, N.
Veh, J.
Ernenwein, J. -P.
Cotter, G.
Giavitto, G.
Prokhorov, D. A.
Prokoph, H.
Żywucka, N.
Chand, T.
Tsirou, M.
Casanova, S.
Reimer, O.
Haerer, L.
Fichet de Clairfontaine, G.
Nakashima, K.
Rieger, F.
Moulin, E.
Shapopi, J. N. S.
Becherini, Y.
Batzofin, R.
van Eldik, C.
Zacharias, M.
Khélifi, B.
Holler, M.
Bi, B.
Luashvili, A.
Bruno, B.
Cerruti, M.
Filipovic, M.
Zouari, S.
Chibueze, J.
Komin, Nu.
Moderski, R.
Olivera-Nieto, L.
Schutte, H. M.
Opis:
Magnetic fields in galaxies and galaxy clusters are believed to be the result of the amplification of intergalactic seed fields during the formation of large-scale structures in the universe. However, the origin, strength, and morphology of this intergalactic magnetic field (IGMF) remain unknown. Lower limits on (or indirect detection of) the IGMF can be obtained from observations of high-energy gamma rays from distant blazars. Gamma rays interact with the extragalactic background light to produce electron−positron pairs, which can subsequently initiate electromagnetic cascades. The gamma-ray signature of the cascade depends on the IGMF since it deflects the pairs. Here we report on a new search for this cascade emission using a combined data set from the Fermi Large Area Telescope and the High Energy Stereoscopic System. Using state-of-the-art Monte Carlo predictions for the cascade signal, our results place a lower limit on the IGMF of B > 7.1 × 10$^{-16}$ G for a coherence length of 1 Mpc even when blazar duty cycles as short as 10 yr are assumed. This improves on previous lower limits by a factor of 2. For longer duty cycles of 10$^{4}$ (10$^{7}$) yr, IGMF strengths below 1.8 × 10$^{-14}$ G (3.9 × 10$^{-14}$ G) are excluded, which rules out specific models for IGMF generation in the early universe.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Very-high-energy γ-ray emission from young massive star clusters in the Large Magellanic Cloud
Autorzy:
Schutte, H. M.
Rowell, G.
Montanari, A.
Marx, R.
Kundu, A.
Glicenstein, J. F.
Żywucka, N.
Jamrozy, Marek
Pühlhofer, G.
Martins, V. Barbosa
Benkhali, F. Ait
Ostrowski, Michał
Brown, A.
Böttcher, M.
Le Stum, S.
Leuschner, F.
Chibueze, O.
Ren, H.
Sushch, I.
Aschersleben, J.
White, R.
de Bony de Lavergne, M.
Mackey, J.
Kluźniak, W.
Renaud, M.
Mitchell, A.
Reimer, A.
Reville, B.
Vecchi, M.
de Naurois, M.
Lenain, J.-P.
Cristofari, P.
Ravikularaman, S.
Chandra, S.
Reimer, O.
Funk, S.
Horns, D.
Filipovic, M.
Sahakian, V.
Lang, R. G.
Egberts, K.
Casanova, S.
Moghadam, M. O.
Brose, R.
Hofmann, W.
Lemoine-Goumard, M.
Feijen, K.
Tsirou, M.
Schüssler, F.
Batzofin, R.
Ruiz-Velasco, E.
Mehta, A.
Borowska, J.
Wagner, S. J.
Bernlöhr, K.
Kosack, K.
Rudak, B.
Santangelo, A.
Spencer, S.
Zdziarski, A. A.
Jankowsky, F.
Bruno, B.
Cotter, G.
Khatoon, R.
Celic, J.
Jung-Richardt, I.
Katarzyński, K.
Brun, F.
Einecke, S.
Dmytriiev, A.
Devin, J.
Panny, S.
Chibueze, J.
Steppa, C.
Hinton, J. A.
Rieger, F.
Ashkar, H.
Heß, B.
Cerruti, M.
Lemière, A.
Sasaki, M.
Chand, T.
Stawarz, Łukasz
Niemiec, J.
Bolmont, J.
de Ona Wilhelmi, E.
Backes, M.
Berge, D.
Venter, C.
Pensec, U.
Aharonian, F.
Terrier, R.
Tsuji, N.
Khélifi, B.
Moderski, R.
Taylor, A. M.
Chen, A.
Becherini, Y.
Regeard, M.
Haerer, L.
Huang, Zhiqiu
Zacharias, M.
Marandon, V.
Peron, G.
Burger-Scheidlin, C.
Holch, T. L.
Sabri, K.
Gabici, S.
Vink, J.
Kostunin, D.
Djuvsland, J.
Grolleron, G.
Wierzcholska, A.
Djannati-Ataï, A.
Moulin, E.
Steinmassl, S.
van Eldik, C.
Martí-Devesa, G.
Ohm, S.
Olivera-Nieto, L.
Kasai, E.
Streil, K.
Zech, A.
Gallant, Y. A.
Komin, Nu.
Salzmann, H.
Schäfer, J.
Fontaine, G.
Mohrmann, L.
Quirrenbach, A.
Glombitza, J.
Sol, H.
Opis:
The Tarantula Nebula in the Large Magellanic Cloud is known for its high star formation activity. At its center lies the young massive star cluster R136, providing a significant amount of the energy that makes the nebula shine so brightly at many wavelengths. Recently, young massive star clusters have been suggested to also efficiently produce very high-energy cosmic rays, potentially beyond PeV energies. Here, we report the detection of very-high-energy γ-ray emission from the direction of R136 with the High Energy Stereoscopic System, achieved through a multicomponent, likelihood-based modeling of the data. This supports the hypothesis that R136 is indeed a very powerful cosmic-ray accelerator. Moreover, from the same analysis, we provide an updated measurement of the γ-ray emission from 30 Dor C, the only superbubble detected at TeV energies presently. The γ-ray luminosity above 0.5 TeV of both sources is (2–3) × 10$^{35}$ erg s$^{−1}$. This exceeds by more than a factor of 2 the luminosity of HESS J1646−458, which is associated with the most massive young star cluster in the Milky Way, Westerlund 1. Furthermore, the γ-ray emission from each source is extended with a significance of >3σ and a Gaussian width of about 30 pc. For 30 Dor C, a connection between the γ-ray emission and the nonthermal X-ray emission appears likely. Different interpretations of the γ-ray signal from R136 are discussed.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
H.E.S.S. programme searching for VHE gamma rays associated with FRBs
Autorzy:
Schüssler, F.
Batzofin, R.
Mehta, A.
Holler, M.
Niemiec, J.
Fontaine, G.
Santangelo, A.
Lenain, J.-P.
Aharonian, F.
Kostunin, D.
Ren, H.
de Ona Wilhelmi, E.
Regeard, M.
Khatoon, R.
Kasai, E.
Wierzcholska, Alicja
Takahashi, T.
Sasaki, M.
Spencer, S.
Steppa, C.
Schäfer, J.
Barbosa Martins, V.
Sharma, A.
Punch, M.
Brose, R.
Reimer, O.
Boisson, C.
Casanova, S.
Huang, Zhiqiu
Wach, T.
Bradascio, F.
Katarzyński, K.
Venter, C.
Chibueze, O.
Kluźniak, W.
Bernlöhr, K.
Böttcher, M.
Brun, F.
Panny, S.
Cerruti, M.
Marandon, V.
van Eldik, C.
Borowska, J.
Sabri, K.
Stawarz, Łukasz
Salzmann, H.
Rudak, B.
Bolmont, J.
Kerszberg, D.
Schutte, H.M.
Parsons, R.D.
Escañuela Nieves, C.
Jaitly, A.
de Naurois, M.
Moulin, E.
Kosack, K.
Żywucka-Hejzner, Natalia
Chand, T.
Mitchell, A.
Archaryya, A.
Lang, R.G.
Gabici, S.
Funk, S.
Ravikularaman, S.
Chen, A.
Steinmassl, S.
Olivera-Nieto, L.
Tsirou, M.
Dmytriiev, A.
Heß, B.
Chandra, S.
Ernenwein, J.-P.
Ostrowski, Michał
Moghadam, M.O.
Djannati-Ataï, A.
Kundu, A.
Khélifi, B.
Le Stum, S.
Jamrozy, Marek
Mackey, J.
Moderski, R.
Einecke, S.
O'Brien, P.
Becherini, Y.
Quirrenbach, A.
Aschersleben, J.
Tanaka, T.
Rowell, G.
Damascene Mbarubucyeye, J.
Meyer, M.
Jung-Richardt, I.
Chibueze, J.
Bruno, B.
Lemoine-Goumard, M.
Pensec, U.
Backes, M.
Djuvsland, J.
Vecchi, M.
Filipovic, M.
Horns, D.
Malyshev, D.
Zdziarski, A.A.
Grolleron, G.
Glicenstein, J.F.
Marx, R.
Rieger, F.
Berge, D.
Lemière, A.
de Assis Scarpin, J.
Pühlhofer, G.
Celic, J.
Brown, A.
Ashkar, H.
de Bony de Lavergne, M.
Hofmann, W.
Luashvili, A.
Egberts, K.
Wagner, S.J.
Shapopi, J.N.S.
Panter, M.
Jankowsky, F.
Burger-Scheidlin, C.
Glombitza, J.
Holch, T.L.
Pita, S.
Sahakian, V.
Reville, B.
Zech, A.
Steenkamp, R.
Komin, Nu.
Opis:
Fast Radio Bursts (FRBs) are highly energetic, extremely short-lived bursts of radio flashes. Despite extensive research, the exact cause of these outbursts remains speculative. The high luminosity, short duration, and high dispersion measure of these events suggest they result from extreme, high-energy extragalactic sources, such as highly magnetized and rapidly spinning neutron stars known as magnetars. The number of detected FRBs, including repeating ones, has grown rapidly in recent years. Except for FRB 20200428D, and FRB-like radio burst that is associated to Galactic magnetar SGR 1935+2154, no multi-wavelength counterpart to any FRB has been detected yet. The High Energy Stereoscopic System (H.E.S.S.) telescope has developed a program to follow up FRBs searching for their gamma-ray counterparts, helping to uncover the nature of FRBs and FRB sources. This paper provides an overview of the searches for FRB sources conducted by H.E.S.S., including follow-up observations and simultaneous multi-wavelength campaigns with radio and X-ray observatories. Among the FRB sources observed by H.E.S.S., nine are localized with redshifts ranging between 0.11 and 0.492 from 2015 to 2022. No significant very high energy (VHE) emission was detected during these observations. We report constraints on the VHE luminosity ranging from 10$^{44}$ erg s$^{-1}$ and 10$^{48}$ erg s$^{-1}$, placing limits on the FRB's region persistent VHE emission and potential FRB afterglow emission across timescales from hours to years.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Curvature in the very-high energy gamma-ray spectrum of M 87
Autorzy:
Schutte, H. M.
Montanari, A.
Marx, R.
Kundu, A.
Glicenstein, J. F.
Żywucka, N.
Jamrozy, Marek
Pühlhofer, G.
Meyer, M.
Damascene Mbarubucyeye, J.
Pita, S.
Zilberman, P.
Joshi, V.
Le Stum, S.
Böttcher, M.
Chibueze, O.
Ren, H.
Aschersleben, J.
Bradascio, F.
de Bony de Lavergne, M.
Mackey, J.
Kluźniak, W.
Fegan, S.
Mitchell, A.
Reimer, A.
Reville, B.
de Naurois, M.
Lenain, J.-P.
Chandra, S.
Reimer, O.
Funk, S.
Bulik, T.
Horns, D.
Sahakian, V.
Lang, R. G.
Egberts, K.
Casanova, S.
Moghadam, M. O.
Holler, M.
Brose, R.
Hofmann, W.
Tanaka, T.
Ait Benkhali, F.
Lemoine-Goumard, M.
Tsirou, M.
Takahashi, T.
Schüssler, F.
Batzofin, R.
Ruiz-Velasco, E.
Collins, T.
Mehta, A.
Wagner, S. J.
Bernlöhr, K.
Kosack, K.
Rudak, B.
Santangelo, A.
Spencer, S.
Zdziarski, A. A.
Boisson, C.
Jankowsky, F.
Shapopi, J. N. S.
Bruno, B.
Luashvili, A.
Cotter, G.
Khatoon, R.
Celic, J.
Leitl, F.
Jung-Richardt, I.
Katarzyński, K.
Brun, F.
Einecke, S.
Dmytriiev, A.
Panny, S.
Chibueze, J.
Steppa, C.
Rieger, F.
Ashkar, H.
Cerruti, M.
Barbosa Martins, V.
Lemière, A.
Sasaki, M.
Chand, T.
Stawarz, Łukasz
Niemiec, J.
Bolmont, J.
de Ona Wilhelmi, E.
Backes, M.
Berge, D.
Venter, C.
Pensec, U.
Aharonian, F.
Terrier, R.
Malyshev, D.
Khélifi, B.
Steenkamp, R.
Moderski, R.
Taylor, A. M.
Chen, A.
Becherini, Y.
Parsons, R. D.
Haerer, L.
Regeard, M.
Zacharias, M.
Burger-Scheidlin, C.
Holch, T. L.
Gabici, S.
Vink, J.
Kostunin, D.
Djuvsland, J.
Grolleron, G.
Wierzcholska, A.
Lypova, I.
Djannati-Ataï, A.
Moulin, E.
Steinmassl, S.
van Eldik, C.
Martí-Devesa, G.
Ohm, S.
Olivera-Nieto, L.
Bylund, T.
Kasai, E.
Streil, K.
Wach, T.
Cecil, R.
Zech, A.
Komin, Nu.
Salzmann, H.
Murach, T.
Punch, M.
Fontaine, G.
Mohrmann, L.
Quirrenbach, A.
Glombitza, J.
Sol, H.
Panter, M.
Opis:
The radio galaxy M 87 is a variable very-high energy (VHE) gamma-ray source, exhibiting three major flares, which were reported in 2005, 2008, and 2010. Despite extensive studies, the origin of the VHE gamma-ray emission is not yet fully understood. In this study, we investigate the VHE gamma-ray spectrum of M 87 during states of high gamma-ray activity, utilizing 20.2 h of H.E.S.S. observations. Our findings indicate a preference for a curved spectrum, characterized by a log-parabola model with extra-galactic background light (EBL) model above 0.3 TeV at the 4σ level, compared to a power-law spectrum with EBL. We investigate the degeneracy between the absorption feature and the EBL normalization and derive upper limits on EBL models that are mainly sensitive in the wavelength range of 12.4 μm–40 μm.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
High-statistics measurement of the cosmic-ray electron spectrum with H.E.S.S.
Autorzy:
Holler, M.
Funk, S.
Reville, B.
Collins, T.
Komin, Nu.
Bulik, T.
Ruiz-Velasco, E.
Taylor, A. M.
Cerruti, M.
de Lavergne, M. de Bony
Pensec, U.
Reimer, A.
Egberts, K.
Fontaine, G.
Chen, A.
Gabici, S.
Kluźniak, W.
Kostunin, D.
Montanari, A.
Żywucka, N.
Venter, C.
Moghadam, M. O.
Bi, B.
Kerszberg, D.
Lenain, J.-P.
Gallant, Y. A.
Lemoine-Goumard, M.
Moulin, E.
de Naurois, M.
Leuschner, F.
Wach, T.
Aschersleben, J.
Malyshev, D.
Zech, A.
Schäfer, J.
Glombitza, J.
Steinmassl, S.
Suzuki, H.
Böttcher, M.
Chand, T.
Einecke, S.
Joshi, V.
Khélifi, B.
Wierzcholska, A.
Batzofin, R.
Meyer, M.
Moderski, R.
Sharma, A.
Santangelo, A.
Schutte, H. M.
Brose, R.
Bouyahiaoui, M.
Jamrozy, Marek
Devin, J.
Ohm, S.
Bernlöhr, K.
Ravikularaman, S.
Huang, Zhiqiu
Becherini, Y.
Shapopi, J. N. S.
Heß, B.
Leitl, F.
Regeard, M.
Chibueze, O.
Chandra, S.
Le Stum, S.
Reis, I.
Kosack, K.
Spencer, S.
Takahashi, T.
Bylund, T.
Berge, D.
Ren, H.
Lang, R. G.
Marx, R.
Borowska, J.
Parsons, D.
Ashkar, H.
Peron, G.
Tsirou, M.
Punch, M.
Horns, D.
Boisson, C.
Kundu, A.
Wagner, S. J.
Zacharias, M.
Niemiec, J.
Mitchell, A.
Panter, M.
Salzmann, H.
Kasai, E.
Olivera-Nieto, L.
Fegan, S.
Rudak, B.
Stawarz, Łukasz
Hofmann, W.
Marinos, P.
Panny, S.
Brun, F.
Cotter, G.
Marandon, V.
Mackey, J.
Luashvili, A.
Tanaka, T.
Brown, A.
Katarzyński, K.
Dmytriiev, A.
Holch, T. L.
Aharonian, F.
van Eldik, C.
Chibueze, J.
Burger-Scheidlin, C.
Terrier, R.
Feijen, K.
Bolmont, J.
Glicenstein, J. F.
Sasaki, M.
Reimer, O.
Wilhelmi, E. de Ona
Steppa, C.
Lemière, A.
Martins, V. Barbosa
Bruno, B.
Sahakian, V.
Rowell, G.
Ernenwein, J.-P.
Ostrowski, Michał
Vecchi, M.
Casanova, S.
Jung-Richardt, I.
Pühlhofer, G.
Quirrenbach, A.
Backes, M.
Schüssler, F.
Grolleron, G.
Jankowsky, F.
Celic, J.
Vink, J.
Zdziarski, A. A.
Martí-Devesa, G.
Mbarubucyeye, J. Damascene
Sol, H.
Rieger, F.
Djuvsland, J.
Mohrmann, L.
Khatoon, R.
Benkhali, F. Ait
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Unveiling extended gamma-ray emission around HESS J1813-178
Autorzy:
Holler, M.
Funk, S.
Renaud, M.
Cecil, R.
Reville, B.
Barnard, J.
Zargaryan, D.
Komin, Nu.
Bulik, T.
Cerruti, M.
Gallant, Y. A.
Noel, Angel
Reimer, A.
Fontaine, G.
Chen, A.
Steenkamp, R.
Mehta, A.
Gabici, S.
Kluźniak, W.
Kostunin, D.
Montanari, A.
Żywucka, N.
Venter, C.
Bi, B.
Lenain, J.-P.
Lemoine-Goumard, M.
Moulin, E.
de Naurois, M.
Leuschner, F.
Wach, T.
Aschersleben, J.
Sushch, I.
Malyshev, D.
Veh, J.
Steinmassl, S.
Suzuki, H.
Goswami, P.
Böttcher, M.
Chand, T.
Giavitto, G.
Einecke, S.
de Ona Wilhelmi, E.
Joshi, V.
Barbosa Martins, V.
Khélifi, B.
Wierzcholska, A.
Ghafourizadeh, S.
Batzofin, R.
Damascene Mbarubucyeye, J.
Moderski, R.
O’Brien, P.
Brose, R.
Bouyahiaoui, M.
Baktash, A.
Jamrozy, Marek
Murach, T.
Specovius, A.
Tsuji, N.
Ohm, S.
Bernlöhr, K.
Becherini, Y.
Leitl, F.
Regeard, M.
Doroshenko, V.
Chibueze, O.
Le Stum, S.
Kosack, K.
Spencer, S.
Holch, T. L.
Takahashi, T.
Berge, D.
Wagner, S. J.
Ren, H.
Marx, R.
Borowska, J.
Ashkar, H.
Parsons, R. D.
Punch, M.
Boisson, C.
Kundu, A.
Roellinghoff, G.
Zacharias, M.
Djannati-Ataï, A.
Niemiec, J.
Mitchell, A.
Panter, M.
Salzmann, H.
Olivera-Nieto, L.
Rudak, B.
Glawion, D.
Hofmann, W.
Marinos, P.
Panny, S.
Füßling, M.
Brun, F.
Cotter, G.
Filipovic, M.
Marandon, V.
Chambery, P.
Breuhaus, M.
Mackey, J.
de Bony de Lavergne, M.
Tanaka, T.
Katarzyński, K.
Zouari, S.
Dmytriiev, A.
Shapopi, J. N. S.
Aharonian, F.
van Eldik, C.
Chibueze, J.
Burger-Scheidlin, C.
Glicenstein, J. F.
Terrier, R.
Feijen, K.
Bolmont, J.
Sasaki, M.
Lang, R. G.
Reimer, O.
Steppa, C.
Lemière, A.
Unbehaun, T.
Reichherzer, P.
Bruno, B.
Ait Benkhali, F.
Sahakian, V.
Ernenwein, J.-P.
Hinton, J. A.
Grondin, M.-H.
Ostrowski, Michał
Vecchi, M.
Casanova, S.
Jung-Richardt, I.
Pühlhofer, G.
Quirrenbach, A.
Prokhorov, D. A.
Backes, M.
Schüssler, F.
Schutte, H. M.
Zdziarski, A. A.
Tluczykont, M.
Grolleron, G.
Jankowsky, F.
Celic, J.
Vink, J.
Klepser, S.
Caroff, S.
Martí-Devesa, G.
Rieger, F.
Mohrmann, L.
Khatoon, R.
Opis:
Context. HESS J1813–178 is a very-high-energy γ-ray source spatially coincident with the young and energetic pulsar PSR J1813–1749 and thought to be associated with its pulsar wind nebula (PWN). Recently, evidence for extended high-energy emission in the vicinity of the pulsar has been revealed in the Fermi Large Area Telescope (LAT) data. This motivates revisiting the HESS J1813–178 region, taking advantage of improved analysis methods and an extended dataset. Aims. Using data taken by the High Energy Stereoscopic System (H.E.S.S.) experiment and the Fermi-LAT, we aim to describe the γ-ray emission in the region with a consistent model, to provide insights into its origin. Methods. We performed a likelihood-based analysis on 32 hours of H.E.S.S. data and 12 yr of Fermi-LAT data and we fitted a spectro-morphological model to the combined datasets. These results allowed us to develop a physical model for the origin of the observed γ-ray emission in the region. Results. In addition to the compact very-high-energy γ-ray emission centred on the pulsar, we find a significant yet previously undetected component along the Galactic plane. With Fermi-LAT data, we confirm extended high-energy emission consistent with the position and elongation of the extended emission observed with H.E.S.S. These results establish a consistent description of the emission in the region from GeV energies to several tens of TeV. Conclusions. This study suggests that HESS J1813–178 is associated with a γ-ray PWN powered by PSR J1813–1749. A possible origin of the extended emission component is inverse Compton emission from electrons and positrons that have escaped the confines of the pulsar and form a halo around the PWN.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The H.E.S.S. extragalactic sky survey with the first decade of observations
Autorzy:
Rowell, G.
Montanari, A.
Marx, R.
Kundu, A.
Glicenstein, J. F.
Goswami, P.
Sanchez, D. A.
Völk, H. J.
Jamrozy, Marek
Pühlhofer, G.
Suzuki, H.
Ostrowski, Michał
Brown, A.
Böttcher, M.
Le Stum, S.
Leuschner, F.
Chibueze, O.
Ren, H.
Aschersleben, J.
Bradascio, F.
de Bony de Lavergne, M.
Mackey, J.
Fegan, S.
Mitchell, A.
Reimer, A.
Reville, B.
Vecchi, M.
de Naurois, M.
Lenain, J.-P.
Cristofari, P.
Ravikularaman, S.
Chandra, S.
Reimer, O.
O’Brien, P.
Funk, S.
Bulik, T.
Horns, D.
Sahakian, V.
Lang, R. G.
Egberts, K.
Casanova, S.
Żywucka-Hejzner, Natalia
Holler, M.
Brose, R.
Hofmann, W.
Tanaka, T.
Ait Benkhali, F.
Lemoine-Goumard, M.
Tsirou, M.
Takahashi, T.
Schüssler, F.
Batzofin, R.
Ruiz-Velasco, E.
Mehta, A.
Sharma, A.
Borowska, J.
Wagner, S. J.
Bernlöhr, K.
Kosack, K.
Rudak, B.
Santangelo, A.
Spencer, S.
Zdziarski, A. A.
Boisson, C.
Jankowsky, F.
Shapopi, J. N. S.
Bruno, B.
Davids, I. D.
Luashvili, A.
Cotter, G.
Khatoon, R.
Celic, J.
Katarzyński, K.
Brun, F.
Einecke, S.
Dmytriiev, A.
Mbarubucyeye, J. D.
Devin, J.
Panny, S.
Chibueze, J.
Steppa, C.
Hinton, J. A.
Rieger, F.
Ashkar, H.
Heß, B.
Wierzcholska, Alicja
Cerruti, M.
Barbosa Martins, V.
Lemière, A.
Sasaki, M.
Chand, T.
Jardin-Blicq, A.
Stawarz, Łukasz
Niemiec, J.
Bolmont, J.
de Ona Wilhelmi, E.
Backes, M.
Berge, D.
Venter, C.
Pensec, U.
Aharonian, F.
Terrier, R.
Thakur, A.
Malyshev, D.
Khélifi, B.
Steenkamp, R.
Moderski, R.
Taylor, A. M.
Chen, A.
Becherini, Y.
Regeard, M.
Haerer, L.
Huang, Zhiqiu
Zacharias, M.
Marandon, V.
Bouyahiaoui, M.
Burger-Scheidlin, C.
Holch, T. L.
Gabici, S.
Vink, J.
Kostunin, D.
Djuvsland, J.
Grolleron, G.
Steinmassl, S.
van Eldik, C.
Martí-Devesa, G.
Olivera-Nieto, L.
Bylund, T.
Kasai, E.
Wach, T.
Zech, A.
Komin, Nu.
Salzmann, H.
Reis, I.
Schäfer, J.
Punch, M.
Fontaine, G.
Mohrmann, L.
Quirrenbach, A.
Glombitza, J.
Sol, H.
Panter, M.
Opis:
The results of the first extragalactic gamma-ray survey by the High Energy Stereoscopic System (H.E.S.S.) are presented. The survey comprises 2720 hours of very high-energy gamma-ray observations of the extragalactic sky, recorded with H.E.S.S. from 2004 up to the end of 2012. These data have been re-analysed using a common consistent set of up-to-date data calibration and analysis tools. From this analysis, a list of 23 detected objects, predominantly blazars, was obtained. This catalogue was assessed in terms of the source class populations that it contains. The level of source parameter bias for the blazar sources, probed by this observational dataset, was evaluated using Monte-Carlo simulations. Spectral results obtained with the H.E.S.S. data were compared with the Fermi-LAT catalogues to present the full gamma-ray picture of the detected objects. Lastly, this unique dataset was used to assess the contribution of BL Lacertae objects and flat-spectrum radio quasars to the extragalactic gamma-ray background light at several hundreds of gigaelectronvolts. These results are accompanied by the release of the high-level data to the astrophysical community.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 41

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies