VHE gamma-ray discovery and multi-wavelength study of the blazar 1ES 2322-409

H.E.S.S. Collaboration; Abdalla, H.; Aharonian, F.; Ait Benkhali, Faical; Angüner, E. O.; Arakawa, M.; Arcaro, C.; Armand, C.; Arrieta, M.; Backes, M.; Barnard, M.; Becherini, Y.; Tjus, J. Becker; Berge, D.; Bernhard, S.; Bernloehr, 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.; Carosi, A.; Casanova, Sabrina; 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, Axel; 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, Joachim; Haupt, M.; Heinzelmann, G.; Henri, G.; Hermann, German; 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, Vincent; Marcowith, A.; Mariaud, C.; Martí-Devesa, G. Guillem; Marx, Ramin; Maurin, G.; Meintjes, P. J.; Mitchell, A.; 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, R. D.; Perennes, C.; Petrucci, P. -O.; Peyaud, B.; Piel, Q.; Pita, S.; Poireau, V.; Noel, A. Priyana; 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, Rui-zhi; Zaborov, D.; Zacharias, M.; Zanin, R.; Zdziarski, A. A.; Zech, A.; Zefi, F.; Ziegler, A.; Zorn, J.; Żywucka, N.

doi:10.1093/mnras/sty2686

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VHE gamma-ray discovery and multi-wavelength study of the blazar 1ES 2322-409

MPS-Authors

/persons/resource/persons30244

Aharonian, F.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons73513

Ait Benkhali, Faical
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30300

Bernloehr, K.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30369

Casanova, Sabrina
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30391

Deil, C.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30418

Donath, Axel
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30555

Hahn, Joachim
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30584

Hermann, German
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30597

Hinton, J. A.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30605

Hofmann, W.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons37725

Marandon, Vincent
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons59477

Marx, Ramin
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons104499

Mitchell, A.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30878

Panter, M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons73254

Parsons, R. D.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30943

Rieger, F.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons226684

Ruiz Velasco, E.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons31117

Tuffs, R.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons31141

Völk, H.J.
Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons146341

White, R.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons37755

Yang, Rui-zhi
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons216888

Zanin, R.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

H.E.S.S. Collaboration, Abdalla, H., Aharonian, F., Ait Benkhali, F., Angüner, E. O., Arakawa, M., et al. (2018). VHE gamma-ray discovery and multi-wavelength study of the blazar 1ES 2322-409. Monthly Notices of the Royal Astronomical Society, 482(3), 3011-3022. doi:10.1093/mnras/sty2686.

Cite as: https://hdl.handle.net/21.11116/0000-0004-F8FA-B

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 22.3h. Point-like
very-high-energy (VHE; E>100GeV) $\gamma$-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 6.0$\sigma$. The average VHE $\gamma$-ray spectrum is well
described with a power law with a photon index
$\Gamma=3.40\pm0.66_{\text{stat}}\pm0.20_{\text{sys}}$ and an integral flux
$\Phi(E>200GeV) = (3.11\pm0.71_{\rm stat}\pm0.62_{\rm sys})\times10^{-12}
cm^{-2} s^{-1}$, which corresponds to 1.1$\%$ of the Crab nebula flux above 200
GeV. Multi-wavelength data obtained with Fermi LAT, Swift XRT and UVOT, RXTE
PCA, ATOM, and additional data from WISE, GROND and Catalina, are also used to
characterise the broad-band non-thermal emission of 1ES 2322-409. The
multi-wavelength 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 (SSC) 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.