H.E.S.S. detection of very-high-energy gamma-ray emission from the quasar PKS 
0736+017

H. E. S. S. Collaboration; Abdalla, H.; Adam, R.; Aharonian, F.; Ait Benkhali, Faical; Angüner, E. O.; Arakawa, M.; Arcaro, C.; Armand, C.; Ashkar, H.; Backes, M.; Martins, V. Barbosa; Barnard, M.; Becherini, Y.; Berge, D.; Bernlöhr, K.; Blackwell, R.; Böttcher, M.; Boisson, C.; Bolmont, J.; Bonnefoy, S.; Bregeon, J.; Breuhaus, M.; Brun, F.; Brun, P.; Bryan, M.; Büchele, M.; Bulik, T.; Bylund, T.; Capasso, M.; Caroff, S.; Carosi, A.; Casanova, S.; Cerruti, M.; Chand, T.; Chandra, S.; Chen, A.; Colafrancesco, S.; Curylo, M.; Davids, I. D.; Deil, C.; Devin, J.; deWilt, P.; Dirson, L.; Djannati-Ataï, A.; Dmytriiev, A.; Donath, A.; Doroshenko, V.; Drury, L. O'C.; Dyks, J.; Egberts, K.; Emery, G.; Ernenwein, J. -P.; Eschbach, S.; Feijen, K.; Fegan, S.; Fiasson, A.; Fontaine, G.; Funk, S.; Füßling, M.; Gabici, S.; Gallant, Y. A.; 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.; Jamrozy, M.; Jankowsky, D.; Jankowsky, F.; Jardin-Blicq, A.; Jung-Richardt, I.; Kastendieck, M. A.; Katarzynski, K.; Katsuragawa, M.; Katz, U.; Khangulyan, D.; Khélifi, B.; King, J.; Klepser, S.; Kluzniak, W.; Komin, Nu.; Kosack, K.; Kostunin, D.; Kraus, M.; Lamanna, G.; Lau, J.; Lemière, A.; Lemoine-Goumard, M.; Lenain, J. -P.; Leser, E.; Levy, C.; Lohse, T.; Lypova, I.; Mackey, J.; Majumdar, J.; Malyshev, D.; Marandon, Vincent; Marcowith, A.; Mares, A.; Mariaud, C.; Martí-Devesa, G.; Marx, Ramin; Maurin, G.; Meintjes, P. J.; Mitchell, A.; Moderski, R.; Mohamed, M.; Mohrmann, L.; Muller, J.; Moore, C.; Moulin, E.; Murach, T.; Nakashima, S.; de Naurois, M.; Ndiyavala, H.; Niederwanger, F.; Niemiec, J.; Oakes, L.; O'Brien, P.; Odaka, H.; Ohm, S.; Wilhelmi, E. de Oña; Ostrowski, M.; Oya, I.; 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.; Remy, Q.; 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.; Schutte, H.; Schwanke, U.; Schwemmer, S.; Seglar-Arroyo, M.; Senniappan, M.; Seyffert, A. S.; Shafi, N.; Shiningayamwe, K.; Simoni, R.; Sinha, A.; Sol, H.; Specovius, A.; Spir-Jacob, M.; Stawarz, L.; Steenkamp, R.; Stegmann, C.; Steppa, C.; Takahashi, T.; Tavernier, T.; Taylor, A. M.; Terrier, R.; 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.; Vincent, P.; Vink, J.; Voisin, F.; Voelk, H. J.; Vuillaume, T.; Wadiasingh, Z.; Wagner, S. J.; White, R.; Wierzcholska, A.; Yang, R.; Yoneda, H.; Zacharias, M.; Zanin, R.; Zdziarski, A. A.; Zech, A.; Ziegler, A.; Zorn, J.; Zywucka, N.; Smith, P. S.

doi:10.1051/0004-6361/201935906

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H.E.S.S. detection of very-high-energy gamma-ray emission from the quasar PKS 0736+017

MPS-Authors

/persons/resource/persons30244

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

/persons/resource/persons73513

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

/persons/resource/persons30300

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

/persons/resource/persons30369

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

/persons/resource/persons30584

Hermann, G.
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.
Prof. Werner Hofmann, Emeriti, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons185147

Jardin-Blicq, A.
Division Prof. Dr. James A. Hinton, 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/persons30878

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

/persons/resource/persons31117

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

/persons/resource/persons31141

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

/persons/resource/persons216888

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

/persons/resource/persons192818

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

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Citation

H. E. S. S. Collaboration, Abdalla, H., Adam, R., Aharonian, F., Ait Benkhali, F., Angüner, E. O., et al. (2020). H.E.S.S. detection of very-high-energy gamma-ray emission from the quasar PKS 0736+017. Astronomy and Astrophysics, A162. doi:10.1051/0004-6361/201935906.

Cite as: https://hdl.handle.net/21.11116/0000-0007-69BA-2

Abstract

Flat-spectrum radio-quasars (FSRQs) are rarely detected at very-high-energies
(VHE; E>100 GeV) due to their low-frequency-peaked SEDs. At present, only 6
FSRQs are known to emit VHE photons, representing only 7% of the VHE
extragalactic catalog. Following the detection of MeV-GeV gamma-ray flaring
activity from the FSRQ PKS 0736+017 (z=0.189) with Fermi, the H.E.S.S. array of
Cherenkov telescopes triggered ToO observations on February 18, 2015, with the
goal of studying the gamma-ray emission in the VHE band. H.E.S.S. ToO
observations were carried out during the nights of February 18, 19, 21, and 24,
2015. Together with Fermi-LAT, the multi-wavelength coverage of the flare
includes Swift observations in soft-X-rays and optical/UV, and optical
monitoring (photometry and spectro-polarimetry) by the Steward Observatory, the
ATOM, the KAIT and the ASAS-SN telescope. VHE emission from PKS 0736+017 was
detected with H.E.S.S. during the night of February 19, 2015, only. Fermi data
indicate the presence of a gamma-ray flare, peaking at the time of the H.E.S.S.
detection, with a flux doubling time-scale of around six hours. The gamma-ray
flare was accompanied by at least a 1 mag brightening of the non-thermal
optical continuum. No simultaneous observations at longer wavelengths are
available for the night of the H.E.S.S. detection. The gamma-ray observations
with H.E.S.S. and Fermi are used to put constraints on the location of the
gamma-ray emitting region during the flare: it is constrained to be just
outside the radius of the broad-line-region with a bulk Lorentz factor $\simeq
20$, or at the level of the radius of the dusty torus with Gamma > 60. PKS
0736+017 is the seventh FSRQ known to emit VHE photons and, at z=0.189, is the
nearest so far. The location of the gamma-ray emitting region during the flare
can be tightly constrained thanks to opacity, variability, and collimation
arguments.