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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
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:
The imprint of the extragalactic background light in the gamma-ray spectra of blazars
Autorzy:
Schady, P.
Bouvier, A.
Murgia, S.
Dermer, C. D.
Porter, T. A.
Vasileiou, V.
Hadasch, D.
Ohno, M.
Brigida, M.
Bloom, E. D.
Gehrels, N.
Morselli, A.
Romoli, C.
Vitale, V.
Rau, A.
Chekhtman, A.
Chiang, J.
Knödlseder, J.
Rainò, S.
Cecchi, C.
Reyes, L. C.
Razzaque, S.
Usher, T. L.
Sanchez, D. A.
Roth, M.
Waite, A. P.
Ciprini, S.
Drlica-Wagner, A.
Orienti, M.
Michelson, P. F.
Focke, W. B.
D’Ammando, F.
Guiriec, S.
Tibaldo, L.
Hays, E.
Favuzzi, C.
Reimer, O.
Ritz, S.
Gustafsson, M.
Scargle, J. D.
Moskalenko, I. V.
Tosti, G.
Conrad, J.
Larsson, S.
Mehault, J.
Caraveo, P. A.
Fukazawa, Y.
Godfrey, G.
Baldini, L.
Rando, R.
Hayashida, M.
Mazziotta, M. N.
Perkins, J. S.
Giordano, F.
Stawarz, Łukasz
Drell, P. S.
Jackson, M. S.
Mizuno, T.
Bottacini, E.
Troja, E.
Gasparrini, D.
Reimer, A.
Spinelli, P.
Digel, S. W.
Fusco, P.
Ajello, M.
Franckowiak, A.
Nuss, E.
Giroletti, M.
Kuss, M.
Greiner, J.
Sgrò, C.
Giglietto, N.
Bellazzini, R.
Piron, F.
Torres, D. F.
Spandre, G.
Sánchez-Conde, M.
Monte, C.
Funk, S.
Cavazzuti, E.
Pivato, G.
Ohsugi, T.
Domínguez, A.
Pesce-Rollins, M.
de Palma, F.
Vianello, G.
Wood, M.
Charles, E.
Glanzman, T.
Grenier, I. A.
Thayer, J. G.
Cohen-Tanugi, J.
do Couto e Silva, E.
Omodei, N.
Lubrano, P.
Cheung, C. C.
Cutini, S.
Tanaka, T.
Allafort, A.
Borgland, A. W.
Jogler, T.
Barbiellini, G.
Monzani, M. E.
Fegan, S. J.
Gargano, F.
Razzano, M.
Winer, B. L.
Vandenbroucke, J.
Wood, K. S.
Caliandro, G. A.
Kataoka, J.
Claus, R.
Ballet, J.
Loparco, F.
Tinivella, M.
Orlando, E.
Blandford, R. D.
Bregeon, J.
Ackermann, M.
Germani, S.
Buson, S.
Takahashi, H.
Lovellette, M. N.
Grove, J. E.
Chiaro, G.
Chaves, R. C. G.
Cameron, R. A.
Thompson, D. J.
Lande, J.
McEnery, J. E.
Suson, D. J.
Bastieri, D.
Latronico, L.
Longo, F.
Bruel, P.
Paneque, D.
Tramacere, A.
Ormes, J. F.
Siskind, E. J.
Buehler, R.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Search for gamma-ray emission from X-ray-selected Seyfert galaxies with Fermi-LAT
Autorzy:
Norris, J. P.
Loparco, F.
Orlando, E.
Hays, E.
Wood, K. S.
Ohno, M.
Tinivella, M.
D'Ammando, F.
Baldini, L.
Berenji, B.
Pesce-Rollins, M.
Fortin, P.
Thayer, J. B.
Ohsugi, T.
Brigida, M.
Bruel, P.
Bonamente, E.
Reimer, A.
Madejski, G. M.
Hadasch, D.
Winer, B. L.
Monte, C.
Bloom, E. D.
Takahashi, H.
Kamae, T.
Lubrano, P.
Cecchi, C.
Giommi, P.
Wood, M.
Tosti, G.
Lott, B.
Okumura, A.
Sbarra, C.
Hayashida, M.
Siskind, E. J.
Mizuno, T.
Nishino, S.
Porter, T. A.
Waite, A. P.
Fusco, P.
Ajello, M.
Kataoka, J.
Borgland, A. W.
Spinelli, P.
Buehler, R.
Johnson, A. S.
Rando, R.
Bellazzini, R.
Longo, F.
Barbiellini, G.
Ballet, J.
Bastieri, D.
Lovellette, M. N.
Ritz, S.
Guiriec, S.
Sanchez, D. A.
Bregeon, J.
Monzani, M. E.
Gasparrini, D.
Mazziotta, M. N.
Giordano, F.
Llena Garde, M.
Fukazawa, Y.
Moskalenko, I. V.
Vandenbroucke, J.
Ozaki, M.
Michelson, P. F.
Pierbattista, M.
Piron, F.
de Angelis, A.
Ferrara, E. C.
Rainò, S.
Takahashi, T.
Lande, J.
Enoto, T.
Buson, S.
Kuss, M.
Ciprini, S.
Drlica-Wagner, A.
Morselli, A.
Cohen-Tanugi, J.
Gehrels, N.
Caraveo, P. A.
Uchiyama, Y.
Pivato, G.
Katagiri, H.
Sgrò, C.
Cavazzuti, E.
Stawarz, Łukasz
Bechtol, K.
Spandre, G.
Murgia, S.
Gargano, F.
Chiang, J.
Cutini, S.
Jóhannesson, G.
Vasileiou, V.
Tanaka, T.
Yang, Z.
Casandjian, J. M.
Germani, S.
Hughes, R. E.
Charles, E.
Paneque, D.
Allafort, A.
Cheung, C. C.
Conrad, J.
Ackermann, M.
Reimer, O.
Claus, R.
Knödlseder, J.
de Palma, F.
Giroletti, M.
Usher, T. L.
Cameron, R. A.
Thompson, D. J.
Godfrey, G.
Troja, E.
Vitale, V.
Razzano, M.
Chekhtman, A.
Fegan, S. J.
Roth, M.
Vianello, G.
Dermer, C. D.
Favuzzi, C.
Strong, A. W.
Grove, J. E.
do Couto e Silva, E.
Torres, D. F.
Drell, P. S.
Giglietto, N.
Zimmer, S.
Nuss, E.
Tibaldo, L.
Caliandro, G. A.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Search for the evaporation of primordial black holes with H.E.S.S.
Autorzy:
Bi, B.
Jamrozy, Marek
Ghafourizadeh, S.
Berge, D.
Fiasson, A.
Steinmassl, S.
Jung-Richardt, I.
Grondin, M. -H.
Spencer, S.
Zdziarski, A. A.
de Naurois, M.
Barbosa Martins, V.
Mitchell, A.
Fichet de Clairfontaine, G.
Borowska, J.
Bulik, T.
O'Brien, P.
Glicenstein, J. F.
Moderski, R.
Füßling, M.
Zargaryan, D.
Malyshev, D.
Zouari, S.
Fontaine, G.
Zech, A.
Reichherzer, P.
Bradascio, F.
Sushch, I.
Leitl, F.
Noel, Angel
Jankowsky, F.
Cerruti, M.
Batzofin, R.
Marinos, P.
Sol, H.
Rudak, B.
Venter, C.
Caroff, S.
de Ona Wilhelmi, E.
Rueda Ricarte, H.
Kosack, K.
Lohse, T.
Schwanke, U.
Brose, R.
Quirrenbach, A.
Tanaka, T.
Leuschner, F.
Horns, D.
Pühlhofer, G.
Burger-Scheidlin, C.
Holler, M.
Kasai, E.
Lypova, I.
Prokhorov, D. A.
Backes, M.
Martí-Devesa, G.
Veh, J.
Sahakian, V.
Becherini, Y.
Kluźniak, W.
Lemière, A.
Ostrowski, Michał
Ait Benkhali, F.
Lenain, J. -P.
Haupt, M.
Suzuki, H.
Kostunin, D.
Haerer, L.
Nakashima, K.
Shapopi, J. N. S.
de Bony de Lavergne, M.
Khélifi, B.
Katarzyński, K.
Żywucka, N.
Aharonian, F.
Glawion, D.
Takahashi, T.
Gabici, S.
Chen, A.
Sanchez, D. A.
Giavitto, G.
Zacharias, M.
Ohm, S.
Mohrmann, L.
Marx, R.
Panter, M.
Wierzcholska, Alicja
Muller, J.
Bolmont, J.
Huang, Z. -Q.
Specovius, A.
White, R.
Prokoph, H.
Hofmann, W.
Mackey, J.
Holch, T. L.
Rieger, F.
Olivera-Nieto, L.
Salzmann, H.
Casanova, S.
Chibueze, O.
Djannati-Ataï, A.
Marandon, V.
Thorpe-Morgan, C.
Brun, F.
Rowell, G.
Hinton, J. A.
Böttcher, M.
van Eldik, C.
Wagner, S. J.
Damascene Mbarubucyeye, J.
Panny, S.
Steppa, C.
Bruno, B.
Ernenwein, J. -P.
Stawarz, Łukasz
Sasaki, M.
Vink, J.
Schutte, H. M.
Luashvili, A.
Moulin, E.
Steenkamp, R.
Punch, M.
Montanari, A.
Niemiec, J.
Wong, Y. W.
Egberts, K.
Chand, T.
Le Stum, S.
Joshi, V.
Komin, N.
Uchiyama, Y.
Cotter, G.
Vecchi, M.
Marchegiani, P.
Aschersleben, J.
Lang, R. G.
Peron, G.
Tsuji, N.
Tavernier, T.
Reimer, O.
Klepser, S.
Santangelo, A.
Celic, J.
Parsons, R. D.
Boisson, C.
Grolleron, G.
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
Tytuł:
A deep spectromorphological study of the $\gamma$-ray emission surrounding the young massive stellar cluster Westerlund 1
Autorzy:
Panter, M.
Tsuji, N.
Blackwell, R.
Ohm, S.
Vecchi, M.
Holler, M.
Tothill, N.
Mezek, G. Kukec
Prokhorov, D. A.
Zacharias, M.
Murach, T.
Venter, C.
Zargaryan, D.
Goswami, P.
Peron, G.
Reichherzer, P.
Malyshev, D.
Martins, V. Barbosa
Cangemi, F.
Jung-Richardt, I.
Żywucka, N.
Fontaine, G.
Joshi, V.
Djannati-Ataï, A.
Grondin, M.-H.
Lavergne, M. de Bony de
Rauth, R.
Thorpe-Morgan, C.
Reville, B.
Martí-Devesa, G.
Kostunin, D.
Backes, M.
Montanari, A.
Lemoine-Goumard, M.
Marchegiani, P.
Ostrowski, Michał
Brun, F.
Marx, R.
Gabici, S.
Hinton, J. A.
Lenain, J.-P.
Sushch, I.
Tuffs, R.
Katarzyński, K.
Lypova, I.
Jamrozy, Marek
Zhu, S. J.
Braiding, C.
Marcowith, A.
Kosack, K.
Ghafourizadeh, S.
Vink, J.
Feijen, K.
Komin, Nu
Meyer, M.
Stawarz, Łukasz
Muller, J.
Reimer, A.
Haupt, M.
Rowell, G.
Härer, L. K.
Reimer, O.
Glawion, D.
Sahakian, V.
Zouari, S.
Salzmann, H.
Rieger, F.
Mbarubucyeye, J. Damascene
Zdziarski, A. A.
Ruiz-Velasco, E.
Funk, S.
Unbehaun, T.
Hofmann, W.
Becherini, Y.
Quirrenbach, A.
Bradascio, F.
Holch, T. L.
Steinmassl, S.
Chibueze, O.
Veh, J.
Cristofari, P.
Ernenwein, J.-P.
Mohrmann, L.
Panny, S.
Cerruti, M.
Maurin, G.
Tanaka, T.
Nakashima, K.
Specovius, A.
Schüssler, F.
Burton, M.
Lemière, A.
Wagner, S. J.
Glicenstein, J. F.
Niemiec, J.
Moulin, E.
Mitchell, A.
Clairfontaine, G. Fichet de
Stum, S. Le
Kasai, E.
Eldik, C. van
Mackey, J.
Steppa, C.
Wong, G.
Burger-Scheidlin, C.
Spencer, S.
Chand, T.
Berge, D.
Lohse, T.
Naurois, M. de
Parsons, R. D.
Giavitto, G.
Giunti, L.
Pühlhofer, G.
Soelen, B. van
Cubuk, K.
Sasaki, M.
Chen, A.
Renaud, M.
Santangelo, A.
White, R.
Marandon, V.
Schwanke, U.
Wong, Y. Wun
Brose, R.
Takahashi, T.
Schutte, H. M.
Horns, D.
Leuschner, F.
Olivera-Nieto, L.
Khélifi, B.
Nayerhoda, A.
Wierzcholska, Alicja
Majumdar, J.
Suzuki, H.
Filipović, M.
Shapopi, J. N. S.
Aharonian, F.
Gallant, Y. A.
Punch, M.
Casanova, S.
Chandra, S.
Ashkar, H.
Luashvili, A.
Hörbe, M.
Rudak, B.
Tsirou, M.
Caroff, S.
Lang, R. G.
Bulik, T.
Kluźniak, W.
Wilhelmi, E. de Ona
Sanchez, D. A.
Bi, B.
Moderski, R.
Böttcher, M.
Terrier, R.
Katz, U.
Steenkamp, R.
Opis:
Context. Young massive stellar clusters are extreme environments and potentially provide the means for efficient particle acceleration. Indeed, they are increasingly considered as being responsible for a significant fraction of cosmic rays (CRs) that are accelerated within the Milky Way. Westerlund 1, the most massive known young stellar cluster in our Galaxy, is a prime candidate for studying this hypothesis. While the very-high-energy γ-ray source HESS J1646−458 has been detected in the vicinity of Westerlund 1 in the past, its association could not be firmly identified. Aims. We aim to identify the physical processes responsible for the γ-ray emission around Westerlund 1 and thus to understand the role of massive stellar clusters in the acceleration of Galactic CRs better. Methods. Using 164 h of data recorded with the High Energy Stereoscopic System (H.E.S.S.), we carried out a deep spectromorphological study of the γ-ray emission of HESS J1646−458. We furthermore employed H I and CO observations of the region to infer the presence of gas that could serve as target material for interactions of accelerated CRs. Results. We detected large-scale (∼2° diameter) γ-ray emission with a complex morphology, exhibiting a shell-like structure and showing no significant variation with γ-ray energy. The combined energy spectrum of the emission extends to several tens of TeV, and it is uniform across the entire source region. We did not find a clear correlation of the γ-ray emission with gas clouds as identified through H I and CO observations. Conclusions. We conclude that, of the known objects within the region, only Westerlund 1 can explain the majority of the γ-ray emission. Several CR acceleration sites and mechanisms are conceivable and discussed in detail. While it seems clear that Westerlund 1 acts as a powerful particle accelerator, no firm conclusions on the contribution of massive stellar clusters to the flux of Galactic CRs in general can be drawn at this point.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 276

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