VHE γ-ray discovery and multiwavelength study of the blazar 1ES 2322-409

Journal
Date Issued
2019
Author(s)
Abdalla, H.
•
Aharonian, F.
•
Ait Benkhali, F.
•
Angüner, E. O.
•
Arakawa, M.
•
Arcaro, C.
•
Armand, C.
•
Arrieta, M.
•
Backes, M.
•
Barnard, M.
•
Becherini, Y.
•
Becker Tjus, J.
•
Berge, D.
•
Bernhard, S.
•
Bernlöhr, K.
•
Blackwell, R.
•
Böttcher, M.
•
Boisson, C.
•
Bolmont, J.
•
Bonnefoy, S.
•
Bordas, P.
•
Bregeon, J.
•
Brun, F.
•
Brun, P.
•
Bryan, M.
•
Büchele, M.
•
Bulik, T.
•
Bylund, T.
•
Capasso, M.
•
Caroff, S.
•
•
Casanova, S.
•
Cerruti, M.
•
Chakraborty, N.
•
Chandra, S.
•
Chaves, R. C. G.
•
Chen, A.
•
Colafrancesco, S.
•
Condon, B.
•
Davids, I. D.
•
Deil, C.
•
Devin, J.
•
deWilt, P.
•
Dirson, L.
•
Djannati-Ataï, A.
•
Dmytriiev, A.
•
Donath, A.
•
Drury, L. O'C.
•
Dyks, J.
•
Egberts, K.
•
Emery, G.
•
Ernenwein, J. -P.
•
Eschbach, S.
•
Fegan, S.
•
Fiasson, A.
•
Fontaine, G.
•
Funk, S.
•
Füßling, M.
•
Gabici, S.
•
Gallant, Y. A.
•
Garrigoux, T.
•
Gaté, F.
•
Giavitto, G.
•
Glawion, D.
•
Glicenstein, J. F.
•
Gottschall, D.
•
Grondin, M. -H.
•
Hahn, J.
•
Haupt, M.
•
Heinzelmann, G.
•
Henri, G.
•
Hermann, G.
•
Hinton, J. A.
•
Hofmann, W.
•
Hoischen, C.
•
Holch, T. L.
•
Holler, M.
•
Horns, D.
•
Huber, D.
•
Iwasaki, H.
•
Jacholkowska, A.
•
Jamrozy, M.
•
Jankowsky, D.
•
Jankowsky, F.
•
Jouvin, L.
•
Jung-Richardt, I.
•
Kastendieck, M. A.
•
Katarzyński, K.
•
Katsuragawa, M.
•
Katz, U.
•
Kerszberg, D.
•
Khangulyan, D.
•
Khélifi, B.
•
King, J.
•
Klepser, S.
•
Kluźniak, W.
•
Komin, Nu
•
Kosack, K.
•
Krakau, S.
•
Kraus, M.
•
Krüger, P. P.
•
Lamanna, G.
•
Lau, J.
•
Lefaucheur, J.
•
Lemière, A.
•
Lemoine-Goumard, M.
•
Lenain, J. -P.
•
Leser, E.
•
Lohse, T.
•
Lorentz, M.
•
López-Coto, R.
•
Lypova, I.
•
Malyshev, D.
•
Marandon, V.
•
Marcowith, A.
•
Mariaud, C.
•
Martí-Devesa, G.
•
Marx, R.
•
Maurin, G.
•
Meintjes, P. J.
•
Mitchell, A. M. W.
•
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.
•
•
Panter, M.
•
Parsons, R. D.
•
Perennes, C.
•
Petrucci, P. -O.
•
Peyaud, B.
•
Piel, Q.
•
Pita, S.
•
Poireau, V.
•
Priyana Noel, A.
•
Prokhorov, D. A.
•
Prokoph, H.
•
Pühlhofer, 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, D. A.
•
Santangelo, A.
•
Sasaki, M.
•
Schlickeiser, R.
•
Schüssler, F.
•
Schulz, A.
•
Schwanke, U.
•
Schwemmer, S.
•
Seglar-Arroyo, M.
•
Senniappan, M.
•
Seyffert, A. S.
•
Shafi, N.
•
Shilon, I.
•
Shiningayamwe, K.
•
Simoni, R.
•
Sinha, A.
•
Sol, H.
•
Spanier, F.
•
Specovius, A.
•
Spir-Jacob, M.
•
Stawarz, Ł.
•
Steenkamp, R.
•
Stegmann, C.
•
Steppa, C.
•
Sushch, I.
•
Takahashi, T.
•
Tavernet, J. -P.
•
Tavernier, T.
•
Taylor, A. M.
•
Terrier, R.
•
Tibaldo, L.
•
Tiziani, D.
•
Tluczykont, M.
•
Trichard, C.
•
Tsirou, M.
•
Tsuji, N.
•
Tuffs, R.
•
Uchiyama, Y.
•
van der Walt, D. J.
•
van Eldik, C.
•
van Rensburg, C.
•
van Soelen, B.
•
Vasileiadis, G.
•
Veh, J.
•
Venter, C.
•
Viana, A.
•
Vincent, P.
•
Vink, J.
•
Voisin, F.
•
Völk, H. J.
•
Vuillaume, T.
•
Wadiasingh, Z.
•
Wagner, S. J.
•
Wagner, P.
•
Wagner, R. M.
•
White, R.
•
Wierzcholska, A.
•
Wörnlein, A.
•
Yang, R.
•
Zaborov, D.
•
Zacharias, M.
•
Zanin, R.
•
Zdziarski, A. A.
•
Zech, A.
•
Zefi, F.
•
Ziegler, A.
•
Zorn, J.
•
Żywucka, N.
•
H. E. S. S. Collaboration
DOI
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 Γ = 3.40 ± 0.66stat ± 0.20sys and an integral flux Φ (E> 200 GeV) = (3.11± 0.71_stat± 0.62_sys)× 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 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.
Volume
482
Issue
3
Start page
3011
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2019MNRAS.482.3011A
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

1810.04641.pdf

Description
postprint
Size

989.18 KB

Format

Adobe PDF

Checksum (MD5)

302105ecadd3b0c1a5b2f6f9698ab7c5

Loading...
Thumbnail Image
Name

sty2686.pdf

Description
Pdf editoriale
Size

1.74 MB

Format

Adobe PDF

Checksum (MD5)

05ebdf74f98c878d4441d38072d2c901