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Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2

A. Abramowski 1 Fabio Acero 2 F. Aharonian 3, 4, 5 F. Ait Benkhali 3 A. G. Akhperjanian 5 E. Angüner 6 G. Anton 7 S. Balenderan 8 Agnès Balzer 9, 10 A. Barnacka 11 Y. Becherini 12 J. Becker Tjus 13 K. Bernlöhr 3, 6 E. Birsin 6 E. Bissaldi 14 J. Biteau 15 M. Böttcher 16 C. Boisson 17 J. Bolmont 18 P. Bordas 19 J. Brucker 7 F. Brun 3 P. Brun 20 T. Bulik 2 S. Carrigan 3 S. Casanova 16, 3 M. Cerruti 21, 22 P. M. Chadwick 8 R. Chalme-Calvet 18 R. C. G. Chaves 2 A. Cheesebrough 8 M. Chrétien 18 S. Colafrancesco 23 G. Cologna 24 J. Conrad 25 C. Couturier 18 Y. Cui 19 M. Dalton 26 M. K. Daniel 8 I. D. Davids 16, 27 B. Degrange 15 C. Deil 3 P. Dewilt 28 H. J. Dickinson 29 A. Djannati-Ataï 30 W. Domainko 3 L. O'C. Drury 4 G. Dubus 31 K. Dutson 32 J. Dyks 11 M. Dyrda 33 T. Edwards 3 K. Egberts 14 P. Eger 3 P. Espigat 30 C. Farnier 29 S. Fegan 15 F. Feinstein 34 M. V. Fernandes 1 D. Fernandez 34 A. Fiasson 35 G. Fontaine 15 A. Förster 3 M. Füßling 36 M. Gajdus 6 Y. A. Gallant 34 T. Garrigoux 18 G. Giavitto 9 B. Giebels 15 J. F. Glicenstein 2 M. -H. Grondin 3, 24 M. Grudzińska 11 S. Häffner 7 J. Hahn 3 J. Harris 8 G. Heinzelmann 1 G. Henri 31 G. Hermann 3 O. Hervet 21 A. Hillert 3 J. A. Hinton 32 W. Hofmann 3 P. Hofverberg 3 M. Holler 36 D. Horns 1 A. Jacholkowska 18 C. Jahn 7 M. Jamrozy 37 M. Janiak 11 F. Jankowsky 24 I. Jung 7 M. A. Kastendieck 1 K. Katarzyński 38 U. Katz 7 S. Kaufmann 24 B. Khélifi 15 Michel Kieffer 18 S. Klepser 9 D. Klochkov 19 W. Kluźniak 11 T. Kneiske 1 D. Kolitzus 14 Nu. Komin 35 K. Kosack 2 S. Krakau 13 F. Krayzel 35 P. P. Krüger 16, 3 H. Laffon 26 G. Lamanna 35 J. Lefaucheur 30 A. Lemière 30 M. Lemoine-Goumard 26 J. -P. Lenain 18 D. Lennarz 3 T. Lohse 6 A. Lopatin 7 C. -C. Lu 3 V. Marandon 3 Alexandre Marcowith 34 R. Marx 3 G. Maurin 35 N. Maxted 28 M. Mayer 36 T. J. L. Mccomb 8 J. Méhault 34 P. J. Meintjes 39 U. Menzler 13 M. Meyer 29 R. Moderski 11 M. Mohamed 24 Emmanuel Moulin 40 T. Murach 6 C. L. Naumann 18 M. de Naurois 15 J. Niemiec 41 S. J. Nolan 8 L. Oakes 6 S. Ohm 32 E. de O Na Wilhelmi 3 B. Opitz 1 M. Ostrowski 41 I. Oya 6 M. Panter 3 R. D. Parsons 3 M. Paz Arribas 6 N. W. Pekeur 16 G. Pelletier 31 J. Perez 42 P. -O. Petrucci 31 B. Peyaud 2 S. Pita 30 H. Poon 3 G. Pühlhofer 19 M. Punch 30 A. Quirrenbach 24 S. Raab 7 M. Raue 1 A. Reimer 14 O. Reimer 14 M. Renaud 34 R. de Los Reyes 3 F. Rieger 3 L. Rob 43 C. Romoli 4 S. Rosier-Lees 35 G. Rowell 28 B. Rudak 11 C. B. Rulten 21 V. Sahakian 5 D. A. Sanchez 35 A. Santangelo 19 R. Schlickeiser 13 F. Schüssler 2 A. Schulz 9 U. Schwanke 6 S. Schwarzburg 19 S. Schwemmer 29 H. Sol 21 G. Spengler 6 F. Spies 1 L. Stawarz 44 R. Steenkamp 27 C. Stegmann 9 F. Stinzing 7 K. Stycz 9 I. Sushch 6 A. Szostek 37 J. -P. Tavernet 18 T. Tavernier 30 A. M. Taylor 4 R. Terrier 30 M. Tluczykont 1 C. Trichard 35 K. Valerius 7 C. van Eldik 7 B. van Soelen 39 G. Vasileiadis 34 C. Venter 16 A. Viana 3 P. Vincent 18 H. J. Völk 3 F. Volpe 3 M. Vorster 16 T. Vuillaume 31 S. J. Wagner 24 P. Wagner 6 M. Ward 8 M. Weidinger 13 Q. Weitzel 3 R. White 32 A. Wierzcholska 44 P. Willmann 7 A. Wörnlein 7 D. Wouters 2 V. Zabalza 3 M. Zacharias 13 A. Zajczyk 11 A. A. Zdziarski 11 A. Zech 21 H. -S. Zechlin 1
Abstract : The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the H.E.S.S. Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1832−093, at the position RA = 18h32m50s ± 3s stat ± 2s syst, Dec = −9◦22′36′′ ± 32′′stat ± 20′′syst (J2000), spatially coincident with a part of the radio shell of the neigh TeV of Φ0 = (4.8 ± 0.8stat ± 1.0syst) × 10−13 cm−2s−1 TeV−1. The location of the gamma-ray emission on the edge of the SNR rim first suggested a signature of escaping cosmic-rays illuminating a nearby molecular cloud. Then a dedicated XMM-Newton observation led to the discovery of a new X-ray point source spatially coincident with the TeV excess. Two other scenarios were hence proposed to identify the nature of HESS J1832−093. Gamma-rays from inverse Compton radiation in the framework of a pulsar wind nebula scenario or the possibility of gamma-ray production within a binary system are therefore also considered. Deeper multi-wavelength observations will help to shed new light on this intriguing VHE source.
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A. Abramowski, Fabio Acero, F. Aharonian, F. Ait Benkhali, A. G. Akhperjanian, et al.. Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2015, 446, pp.1163-1169. ⟨10.1093/mnras/stu2148⟩. ⟨in2p3-01085027⟩

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