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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:
Search for dark matter annihilation signals in the H.E.S.S. Inner Galaxy Survey
Autorzy:
de Clairfontaine, G. Fichet
Holler, M.
Funk, S.
Renaud, M.
Baghmanyan, V.
Katz, U.
Senniappan, M.
Zargaryan, D.
Komin, Nu.
Ruiz-Velasco, E.
Cerruti, M.
de Lavergne, M. de Bony
Armand, C.
Noel, Angel
Reimer, A.
Egberts, K.
White, R.
Fontaine, G.
Chen, A.
Gabici, S.
Kluźniak, W.
Kostunin, D.
Montanari, A.
Żywucka, N.
Bi, B.
Lamanna, G.
Lemoine-Goumard, M.
Moulin, E.
de Naurois, M.
Lohse, T.
Leuschner, F.
Malyshev, D.
Veh, J.
Zech, A.
Steinmassl, S.
Böttcher, M.
Chand, T.
Giavitto, G.
Khélifi, B.
Angüner, E. O.
Batzofin, R.
Meyer, M.
Moderski, R.
Schwanke, U.
Lypova, I.
Santangelo, A.
Fiasson, A.
Brose, R.
Specovius, A.
Jamrozy, Marek
Tsuji, N.
Devin, J.
Thorpe-Morgan, C.
Ohm, S.
Bernlöhr, K.
Lenain, J. -P.
Huang, Zhiqiu
Becherini, Y.
Doroshenko, V.
Kosack, K.
Ricarte, H. Rueda
Spencer, S.
Holch, T. L.
Takahashi, T.
Berge, D.
Wagner, S. J.
Marchegiani, P.
Marx, R.
Ashkar, H.
Peron, G.
Prokoph, H.
Parsons, R. D.
Punch, M.
Tsirou, M.
Horns, D.
Uchiyama, Y.
Cangemi, F.
Zacharias, M.
Djannati-Ataï, A.
Niemiec, J.
Mitchell, A.
Panter, M.
Salzmann, H.
Kasai, E.
Wierzcholska, Alicja
Olivera-Nieto, L.
Rudak, B.
Abdalla, H.
Stawarz, Łukasz
Grondin, M. -H.
Glawion, D.
Hofmann, W.
Panny, S.
Brun, F.
Cotter, G.
Marandon, V.
Mackey, J.
Luashvili, A.
Tanaka, T.
Wong, Yu Wun
Katarzyński, K.
Zouari, S.
Dmytriiev, A.
Shapopi, J. N. S.
Aharonian, F.
van Eldik, C.
Glicenstein, J. F.
Terrier, R.
Muller, J.
Bolmont, J.
Sasaki, M.
Stegmann, C.
Maurin, G.
Reimer, O.
Wilhelmi, E. de Ona
Steppa, C.
Reichherzer, P.
Martins, V. Barbosa
Sahakian, V.
Rowell, G.
Hinton, J. A.
Ostrowski, Michał
Zhu, S. J.
Pühlhofer, G.
Quirrenbach, A.
Backes, M.
Schüssler, F.
Schutte, H. M.
Zdziarski, A. A.
Tluczykont, M.
Jankowsky, F.
Vink, J.
Caroff, S.
Martí-Devesa, G.
Mbarubucyeye, J. Damascene
Sol, H.
Rieger, F.
Poireau, V.
Benkhali, F. Ait
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:
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:
The Cherenkov Telescope Array potential for the study of young supernova remnants
Autorzy:
Rovero, A. C.
Huovelin, J.
Siejkowski, H.
Majumdar, P.
Hrupec, D.
Baushev, A.
Garcia, B.
Lucarelli, F.
Katz, U.
Orito, R.
Bulik, T.
Weinstein, A.
Nievas, M.
Hrabovsky, M.
Kubo, H.
Gaug, M.
Ohishi, M.
Kaufmann, S.
Di Giulio, C.
Mirabal, N.
Nosek, D.
Szanecki, M.
Dournaux, J.-L.
Komin, N.
Maccarone, M. C.
Ebr, J.
Nunio, F.
Yoshikoshi, T.
Bonardi, A.
Egberts, K.
Fontaine, G.
Lee, W. H.
Pech, M.
Kluźniak, W.
De Lotto, B.
Pareschi, G.
Lamanna, G.
Lenain, J.-P.
Kocot, J.
Persic, M.
Moulin, E.
Carr, J.
Chudoba, J.
Lohse, T.
Tibolla, O.
Meagher, K.
de los Reyes Lopez, R.
Hörandel, J.
Wilhelm, A.
Lombardi, S.
Nishijima, K.
Ong, R. A.
Romano, P.
Vallania, P.
Khélifi, B.
Fesquet, M.
Telezhinsky, I.
Jamrozy, Marek
de la Calle, I.
Rodriguez Fernandez, G.
Szepieniec, T.
Pohl, M.
Ohm, S.
Di Girolamo, T.
Palatka, M.
Font, L.
De Palma, F.
Mazziotta, M. N.
Giordano, F.
Acharya, B. S.
Di Pierro, F.
Stefanik, S.
Fleischhack, H.
Rainò, S.
Chadwick, P.
Kaaret, P. E.
Berge, D.
Wagner, S. J.
Becker Tjus, J.
Maier, G.
Morselli, A.
Gonzalez, M. M.
Wakely, S. P.
Giuliani, A.
Dwarkadas, V.
Niemiec, J.
Grabarczyk, T.
Caraveo, P.
Barrio, J. A.
Wierzcholska, Alicja
Rudak, B.
Busetto, G.
Contreras, J. L.
Burton, M.
Tovmassian, G.
Gargano, F.
Hassan, T.
Cotter, G.
Prouza, M.
Vigorito, C.
Bohacova, M.
Fuessling, M.
Brown, A.
Babic, A.
van Eldik, C.
Sillanpää, A.
Carosi, R.
Stolarczyk, T.
Aramo, C.
De Franco, A.
Malaguti, G.
Mandat, D.
Humensky, T. B.
López-Coto, R.
Wojcik, P.
Travnicek, P.
Kushida, J.
Janecek, P.
Quirrenbach, A.
Shayduk, M.
Vercellone, S.
Dazzi, F.
Garrido, D.
Otte, N.
López-Oramas, A.
Garcia López, R.
Connaughton, V.
Conforti, V.
Förster, A.
Godinovic, N.
Tejedor, L. A.
Bugaev, V.
Giglietto, N.
Trzeciak, M.
Schovanek, P.
Tibaldo, L.
Teshima, M.
Garczarczyk, M.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
TeV flaring activity of the AGN PKS 0625–354 in November 2018
Autorzy:
Schüssler, F.
Holch, T. L.
Batzofin, R.
Mehta, A.
Holler, M.
Niemiec, J.
Barnard, J.
Fontaine, G.
Wierzcholska, A.
Lenain, J.-P.
Aharonian, F.
Kostunin, D.
Lang, R. G.
de Ona Wilhelmi, E.
Ren, H.
Streil, K.
Giavitto, G.
Caroff, S.
Ohm, S.
Glawion, D.
O’Brien, P.
Khatoon, R.
Kasai, E.
Sanchez, D. A.
Takahashi, T.
Sasaki, M.
Leitl, F.
Spencer, S.
Barbosa Martins, V.
Ait Benkhali, F.
Punch, M.
Brose, R.
Reimer, O.
Boisson, C.
Casanova, S.
Bradascio, F.
Katarzyński, K.
Venter, C.
Chibueze, O.
Kluźniak, W.
Bernlöhr, K.
Bulik, T.
Böttcher, M.
Brun, F.
Panny, S.
Cerruti, M.
Veh, J.
van Eldik, C.
Borowska, J.
Schutte, H. M.
Stawarz, Łukasz
Hinton, J. A.
Salzmann, H.
Bylund, T.
Rudak, B.
Bolmont, J.
Reimer, A.
Joshi, V.
Bi, B.
de Naurois, M.
Suzuki, H.
Moulin, E.
Kosack, K.
Wagner, S. J.
Zargaryan, D.
Chand, T.
Mitchell, A.
Gabici, S.
Funk, S.
Chen, A.
Baktash, A.
Steinmassl, S.
Olivera-Nieto, L.
Breuhaus, M.
Dmytriiev, A.
Chandra, S.
Davids, I. D.
Ernenwein, J.-P.
Ostrowski, Michał
Doroshenko, V.
Khélifi, B.
Le Stum, S.
Jamrozy, Marek
Shapopi, J. N. S.
Cotter, G.
Mackey, J.
Moderski, R.
Leuschner, F.
Ghafourizadeh, S.
Einecke, S.
Becherini, Y.
Quirrenbach, A.
Cecil, R.
Aschersleben, J.
Specovius, A.
Tanaka, T.
Damascene Mbarubucyeye, J.
Meyer, M.
Jung-Richardt, I.
Chibueze, J.
Bruno, B.
Haerer, L.
Backes, M.
Prokhorov, D. A.
Djuvsland, J.
Vecchi, M.
Żywucka, N.
Horns, D.
Grolleron, G.
Marx, R.
Glicenstein, J. F.
Reichherzer, P.
Zouari, S.
Goswami, P.
Rieger, F.
Berge, D.
Lemière, A.
Parsons, R. D.
Pühlhofer, G.
Celic, J.
Brown, A.
Ashkar, H.
de Bony de Lavergne, M.
Luashvili, A.
Egberts, K.
Sol, H.
Montanari, A.
Sushch, I.
Jankowsky, F.
Burger-Scheidlin, C.
Glombitza, J.
Füßling, M.
Pita, S.
Sahakian, V.
Zdziarski, A. A.
Zech, A.
Steenkamp, R.
Zacharias, M.
Komin, Nu.
Opis:
Most γ-ray detected active galactic nuclei are blazars with one of their relativistic jets pointing towards the Earth. Only a few objects belong to the class of radio galaxies or misaligned blazars. Here, we investigate the nature of the object PKS 0625−354, its γ-ray flux and spectral variability and its broad-band spectral emission with observations from H.E.S.S., Fermi-LAT, Swift-XRT, and UVOT taken in November 2018. The H.E.S.S. light curve above 200 GeV shows an outburst in the first night of observations followed by a declining flux with a halving time scale of 5.9 h. The γγ-opacity constrains the upper limit of the angle between the jet and the line of sight to ∼10°. The broad-band spectral energy distribution shows two humps and can be well fitted with a single-zone synchrotron self Compton emission model. We conclude that PKS 0625−354, as an object showing clear features of both blazars and radio galaxies, can be classified as an intermediate active galactic nuclei. Multi-wavelength studies of such intermediate objects exhibiting features of both blazars and radio galaxies are sparse but crucial for the understanding of the broad-band emission of γ-ray detected active galactic nuclei in general.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 184

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