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Title: VHE gamma-ray discovery and multiwavelength study of the blazar 1ES 2322-409
Authors: Abdalla, H
Aharonian, F
Benkhali, FA
Anguner, EO
Arakawa, M
Arcaro, C
Armand, C
Arrieta, M
Backes, M
Barnard, M
Becherini, Y
Tjus, JB
Berge, D
Bernhard, S
Bernloehr, K
Blackwell, R
Bottcher, M
Boisson, C
Bolmont, J
Bonnefoy, S
Bordas, P
Bregeon, J
Brun, F
Brun, P
Bryan, M
Buechele, M
Bulik, T
Bylund, T
Capasso, M
Caroff, S
Carosi, A
Casanova, S
Cerruti, M
Chakraborty, N
Chandra, S
Chaves, RCG
Chen, A
Colafrancesco, S
Condon, B
Davids, ID
Dei, C
Devin, J
deWilt, P
Dirson, L
Djannati-Atai, A
Dmytriiev, A
Donath, A
Drury, LOC
Dyks, J
Egberts, K
Emery, G
Ernenwein, J-P
Eschbach, S
Fegan, S
Fiasson, A
Fontaine, G
Funk, S
Fuessling, M
Gabici, S
Gallant, YA
Garrigoux, T
Gate, F
Giavitto, G
Glawion, D
Glicenstein, JF
Gottschall, D
Grondin, M-H
Hahn, J
Haupt, M
Heinzelmann, G
Henri, G
Hermann, G
Hinton, JA
Hofmann, W
Hoischen, C
Holch, TL
Holler, M
Horns, D
Huber, D
Iwasaki, H
Jacholkowska, A
Jamrozy, M
Jankowsky, D
Jankowsky, F
Jouvin, L
Jung-Richardt, I
Kastendieck, MA
Katarzynski, K
Katsuragawa, M
Katz, U
Kerszberg, D
Khangulyan, D
Khelifi, B
King, J
Klepser, S
Kluzniak, W
Komin, N
Kosack, K
Krakau, S
Kraus, M
Kruger, RR
Lamanna, G
Lau, J
Lefaucheur, J
Lemiere, A
Lemoine-Goumard, M
Lenain, J-P
Leser, E
Lohse, T
Lorentz, M
Lopez-Coto, R
Lypova, I
Malyshev, D
Marandon, V
Marcowith, A
Mariaud, C
Marti-Devesa, G
Marx, R
Maurin, G
Meintjes, PJ
Mitche, AMW
Moderski, R
Mohamed, M
Mohrmann, L
Moulin, E
Murach, T
Nakashima, S
de Naurois, M
Ndiyavala, H
Niederwanger, F
Niemiec, J
Oakes, L
O'Brien, P
Odaka, H
Ohm, S
Ostrowski, M
Oya, I
Padovani, M
Panter, M
Parsons, RD
Perennes, C
Petrucci, P-O
Peyaud, B
Piel, Q
Pita, S
Poireau, V
Noel, AP
Prokhorov, DA
Prokoph, H
Puehlhofer, G
Punch, M
Quirrenbach, A
Raab, S
Rauth, R
Reimer, A
Reimer, O
Renaud, M
Rieger, F
Rinchiuso, L
Romoli, C
Rowell, G
Rudak, B
Ruiz-Velasco, E
Sahakian, V
Saito, S
Sanchez, DA
Santangelo, A
Sasaki, M
Schlickeiser, R
Schussler, F
Schulz, A
Schwanke, U
Schwemmer, S
Seglar-Arroyo, M
Senniappan, M
Seyffert, AS
Shafi, N
Shilon, I
Shiningayamwe, K
Simoni, R
Sinha, A
Sol, H
Spanier, F
Specovius, A
Spir-Jacob, M
Stawarz, L
Steenkamp, R
Stegmann, C
Steppa, C
Sushch, I
Takahashi, T
Tavernet, J-P
Tavernier, T
Taylor, AM
Terrier, R
Tibaldo, L
Tiziani, D
Tluczykont, M
Trichard, C
Tsirou, M
Tsuji, N
Tuffs, R
Uchiyama, Y
van der Walt, DJ
van Eldik, C
van Rensburg, C
van Soelen, B
Vasileiadis, G
Veh, J
Venter, C
Viana, A
Vincent, P
Vink, J
Voisin, F
Voelk, HJ
Vuillaume, T
Wadiasingh, Z
Wagner, SJ
Wagner, P
Wagner, RM
White, R
Wierzcholska, A
Woernlein, A
Yang, R
Zaborov, D
Zacharias, M
Zanin, R
Zdziarski, AA
Zech, A
Zefi, F
Ziegler, A
Zorn, J
Zywucka, N
First Published: 5-Oct-2018
Publisher: Oxford University Press (OUP), Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2019, 482 (3), pp. 3011-3022 (12)
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 > 100 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 = 3.40 ± 0.66stat ± 0.20sys and an integral flux (E > 200 GeV) = (3.11 ± 0.71stat ± 0.62sys) × 10−12 cm−2 s−1, which corresponds to 1.1 per cent of the Crab nebula flux above 200 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 synchrotronself-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.
DOI Link: 10.1093/mnras/sty2686
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2018, Oxford University Press (OUP), Royal Astronomical Society. Deposited with reference to the publisher’s open access archiving policy. (
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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