VHE $\gamma$-ray discovery and multiwavelength study of the blazar 1ES 2322−409

H. Abdalla F. Aharonian F. Ait Benkhali E.O. Angüner 1 M. Arakawa C. Arcaro C. Armand 2 M. Arrieta 3 M. Backes M. Barnard Y. Becherini J. Becker Tjus D. Berge S. Bernhard K. Bernlöhr R. Blackwell M. Böttcher C. Boisson 3 J. Bolmont 4 S. Bonnefoy P. Bordas J. Bregeon 5 F. Brun 6 P. Brun 7 M. Bryan M. Büchele T. Bulik T. Bylund M. Capasso S. Caroff 2 A. Carosi 2 S. Casanova M. Cerruti 4 N. Chakraborty S. Chandra R.C.G. Chaves 5 A. Chen S. Colafrancesco B. Condon 6 I.D. Davids C. Deil J. Devin 5 P. Dewilt L. Dirson A. Djannati-Ataï 8 A. Dmytriiev 3 A. Donath L.O'C. Drury J. Dyks K. Egberts G. Emery 4 J.P. Ernenwein 1 S. Eschbach S. Fegan 9 A. Fiasson 2 G. Fontaine 10 S. Funk M. Füßling S. Gabici 8 Y.A. Gallant 5 T. Garrigoux F. Gaté 2 G. Giavitto D. Glawion J.F. Glicenstein 7 D. Gottschall M.H. Grondin 6 J. Hahn M. Haupt G. Heinzelmann G. Henri 11 G. Hermann J.A. Hinton W. Hofmann C. Hoischen T.L. Holch M. Holler D. Horns D. Huber H. Iwasaki A. Jacholkowska 4 M. Jamrozy D. Jankowsky F. Jankowsky L. Jouvin 8 I. Jung-Richardt M.A. Kastendieck K. Katarzyński M. Katsuragawa U. Katz D. Kerszberg 4 D. Khangulyan B. Khélifi 8 J. King S. Klepser W. Kluźniak Nu. Komin K. Kosack 7 S. Krakau M. Kraus P.P. Krüger G. Lamanna J. Lau J. Lefaucheur 7 A. Lemière 8 M. Lemoine-Goumard 6 J.P. Lenain 4 E. Leser T. Lohse M. Lorentz 7 R. López-Coto I. Lypova D. Malyshev V. Marandon A. Marcowith 5 C. Mariaud 9 G. Guillem Martí-Devesa R. Marx G. Maurin 2 P.J. Meintjes A.M.W. Mitchell R. Moderski M. Mohamed L. Mohrmann E. Moulin 7 T. Murach S. Nakashima M. de Naurois 9 H. Ndiyavala F. Niederwanger J. Niemiec L. Oakes P. O'Brien H. Odaka S. Ohm M. Ostrowski I. Oya M. Padovani 5 M. Panter R.D. Parsons C. Perennes 4 P.O. Petrucci 11 B. Peyaud 7 Q. Piel 2 S. Pita 8 V. Poireau 2 A. Priyana Noel D.A. Prokhorov H. Prokoph G. Pühlhofer M. Punch 8 A. Quirrenbach S. Raab R. Rauth A. Reimer O. Reimer M. Renaud 5 F. Rieger L. Rinchiuso 12 C. Romoli G. Rowell B. Rudak E. Ruiz-Velasco V. Sahakian S. Saito D.A. Sanchez 2 A. Santangelo M. Sasaki R. Schlickeiser F. Schüssler 7 A. Schulz U. Schwanke S. Schwemmer M. Seglar-Arroyo M. Senniappan A.S. Seyffert N. Shafi I. Shilon K. Shiningayamwe R. Simoni A. Sinha 8 H. Sol 3 F. Spanier A. Specovius M. Spir-Jacob 8 Ł. Stawarz R. Steenkamp C. Stegmann C. Steppa I. Sushch T. Takahashi J.P. Tavernet 4 T. Tavernier 7 A.M. Taylor R. Terrier 10 L. Tibaldo D. Tiziani M. Tluczykont C. Trichard 9 M. Tsirou 5 N. Tsuji R. Tuffs Y. Uchiyama D.J. van der Walt C. van Eldik C. van Rensburg B. van Soelen G. Vasileiadis 5 J. Veh C. Venter A. Viana P. Vincent 13 J. Vink F. Voisin 8 H.J. Völk T. Vuillaume 2 Z. Wadiasingh S.J. Wagner P. Wagner R.M. Wagner R. White A. Wierzcholska A. Wörnlein R. Yang D. Zaborov 1 M. Zacharias R. Zanin A.A. Zdziarski A. Zech 3 F. Zefi 9 A. Ziegler J. Zorn N. Żywucka
Abstract : A hotspot at a position compatible with the BL Lac object 1ES 2322−409 was serendipitously detected with H.E.S.S. during observations performed in 2004 and 2006 on the blazar PKS 2316−423. Additional data on 1ES 2322−409 were taken in 2011 and 2012, leading to a total live-time of 22.3 h. Point-like very-high-energy (VHE; |$E\gt 100\, \mathrm{GeV}$|⁠) γ-ray emission is detected from a source centred on the 1ES 2322−409 position, with an excess of 116.7 events at a significance of 6.0σ. The average VHE γ-ray spectrum is well described with a power law with a photon index Γ = 3.40 ± 0.66_stat ± 0.20_sys and an integral flux |$\Phi (E\gt 200\, \mathrm{GeV}) = (3.11\pm 0.71_{\rm stat}\pm 0.62_{\rm sys})\times 10^{-12} \, \mathrm{cm}^{-2} \, \mathrm{s}^{-1}$|⁠, which corresponds to 1.1 |${{\ \rm per\ cent}}$| of the Crab nebula flux above |$200\, \mathrm{GeV}$|⁠. Multiwavelength data obtained with Fermi LAT, Swift XRT and UVOT, RXTE PCA, ATOM, and additional data from WISE, GROND, and Catalina are also used to characterize the broad-band non-thermal emission of 1ES 2322−409. The multiwavelength behaviour indicates day-scale variability. Swift UVOT and XRT data show strong variability at longer scales. A spectral energy distribution (SED) is built from contemporaneous observations obtained around a high state identified in Swift data. A modelling of the SED is performed with a stationary homogeneous one-zone synchrotron-self-Compton leptonic model. The redshift of the source being unknown, two plausible values were tested for the modelling. A systematic scan of the model parameters space is performed, resulting in a well-constrained combination of values providing a good description of the broad-band behaviour of 1ES 2322−409.
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H. Abdalla, F. Aharonian, F. Ait Benkhali, E.O. Angüner, M. Arakawa, et al.. VHE $\gamma$-ray discovery and multiwavelength study of the blazar 1ES 2322−409. Mon.Not.Roy.Astron.Soc., 2019, 482 (3), pp.3011-3022. ⟨10.1093/mnras/sty2686⟩. ⟨hal-01921605⟩

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