H.E.S.S. detection of very high-energy γ-ray emission from the quasar PKS 0736+017 - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2020

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

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H. Abdalla
  • Function : Author
R. Adam
F. Aharonian
F. Ait Benkhali
  • Function : Author
M. Arakawa
C. Arcaro
M. Backes
M. Barnard
Y. Becherini
  • Function : Author
D. Berge
K. Bernlöhr
R. Blackwell
  • Function : Author
M. Böttcher
C. Boisson
J. Bregeon
M. Breuhaus
M. Bryan
  • Function : Author
M. Büchele
  • Function : Author
T. Bulik
  • Function : Author
T. Bylund
M. Capasso
  • Function : Author
S. Casanova
M. Cerruti
T. Chand
S. Chandra
A. Chen
  • Function : Author
S. Colafrancesco
  • Function : Author
M. Curyło
  • Function : Author
I. D. Davids
  • Function : Author
C. Deil
  • Function : Author
P. Dewilt
  • Function : Author
L. Dirson
  • Function : Author
A. Donath
V. Doroshenko
L. O’c. Drury
  • Function : Author
J. Dyks
  • Function : Author
K. Egberts
  • Function : Author
S. Eschbach
  • Function : Author
K. Feijen
  • Function : Author
S. Fegan
A. Fiasson
S. Funk
  • Function : Author
G. Giavitto
D. Glawion
D. Gottschall
  • Function : Author
J. Hahn
  • Function : Author
G. Heinzelmann
  • Function : Author
G. Hermann
  • Function : Author
J. A. Hinton
  • Function : Author
W. Hofmann
  • Function : Author
C. Hoischen
T. L. Holch
  • Function : Author
M. Holler
  • Function : Author
D. Horns
D. Huber
  • Function : Author
H. Iwasaki
  • Function : Author
M. Jamrozy
D. Jankowsky
  • Function : Author
F. Jankowsky
  • Function : Author
A. Jardin-Blicq
I. Jung-Richardt
  • Function : Author
M. A. Kastendieck
  • Function : Author
K. Katarzyński
  • Function : Author
M. Katsuragawa
  • Function : Author
U. Katz
D. Khangulyan
B. Khélifi
J. King
  • Function : Author
S. Klepser
W. Kluźniak
  • Function : Author
Nu. Komin
D. Kostunin
M. Kraus
  • Function : Author
J. Lau
  • Function : Author
T. Lohse
J. Mackey
D. Malyshev
V. Marandon
G. Martí-Devesa
R. Marx
P. J. Meintjes
  • Function : Author
A. M. W. Mitchell
  • Function : Author
R. Moderski
  • Function : Author
M. Mohamed
  • Function : Author
L. Mohrmann
J. Muller
C. Moore
T. Murach
S. Nakashima
  • Function : Author
M. de Naurois
H. Ndiyavala
F. Niederwanger
  • Function : Author
J. Niemiec
L. Oakes
  • Function : Author
P. O’brien
  • Function : Author
H. Odaka
  • Function : Author
S. Ohm
M. Ostrowski
M. Panter
  • Function : Author
R. D. Parsons
  • Function : Author
A. Priyana Noel
  • Function : Author
D. A. Prokhorov
  • Function : Author
H. Prokoph
  • Function : Correspondent author
G. Pühlhofer
  • Function : Author
M. Punch
A. Quirrenbach
  • Function : Author
S. Raab
  • Function : Author
R. Rauth
A. Reimer
O. Reimer
  • Function : Author
F. Rieger
C. Romoli
G. Rowell
B. Rudak
E. Ruiz-Velasco
V. Sahakian
  • Function : Author
S. Saito
  • Function : Author
A. Santangelo
M. Sasaki
R. Schlickeiser
  • Function : Author
H. Schutte
U. Schwanke
S. Schwemmer
  • Function : Author
M. Senniappan
A. S. Seyffert
  • Function : Author
N. Shafi
  • Function : Author
K. Shiningayamwe
  • Function : Author
R. Simoni
  • Function : Author
A. Specovius
  • Function : Author
Ł. Stawarz
  • Function : Author
R. Steenkamp
  • Function : Author
C. Steppa
D. Tiziani
  • Function : Author
M. Tluczykont
  • Function : Author
N. Tsuji
R. Tuffs
  • Function : Author
Y. Uchiyama
  • Function : Author
D. J. van Der Walt
  • Function : Author
C. van Eldik
C. van Rensburg
  • Function : Author
B. van Soelen
J. Veh
  • Function : Author
C. Venter
J. Vink
F. Voisin
  • Function : Author
H. J. Völk
  • Function : Author
Z. Wadiasingh
S. J. Wagner
  • Function : Author
A. Wierzcholska
H. Yoneda
  • Function : Author
M. Zacharias
R. Zanin
A. A. Zdziarski
  • Function : Author
A. Zech
A. Ziegler
  • Function : Author
J. Zorn
N. Żywucka
P. S. Smith
  • Function : Author

Abstract

Context. Flat-spectrum radio-quasars (FSRQs) are rarely detected at very high energies (E ≥ 100 GeV) due to their low-frequency-peaked spectral energy distributions. At present, only six FSRQs are known to emit very high-energy (VHE) photons, representing only 7% of the VHE extragalactic catalog, which is largely dominated by high-frequency-peaked BL Lacertae objects.Aims. Following the detection of MeV–GeV γ-ray flaring activity from the FSRQ PKS 0736+017 (z = 0.189) with Fermi-LAT, the H.E.S.S. array of Cherenkov telescopes triggered target-of-opportunity (ToO) observations on February 18, 2015, with the goal of studying the γ-ray emission in the VHE band.Methods. 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-ray and optical-UV bands, and optical monitoring (photometry and spectro-polarimetry) by the Steward Observatory, and the ATOM, the KAIT, and the ASAS-SN telescopes.Results. VHE emission from PKS 0736+017 was detected with H.E.S.S. only during the night of February 19, 2015. Fermi-LAT data indicate the presence of a γ-ray flare, peaking at the time of the H.E.S.S. detection, with a flux doubling timescale of around six hours. The γ-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 γ-ray observations with H.E.S.S. and Fermi-LAT are used to put constraints on the location of the γ-ray emitting region during the flare: it is constrained to be just outside the radius of the broad-line region rBLR with a bulk Lorentz factor Γ ≃ 20, or at the level of the radius of the dusty torus rtorus with Γ ≃ 60.Conclusions. 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 γ-ray emitting region during the flare can be tightly constrained thanks to opacity, variability, and collimation arguments.
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Dates and versions

cea-02458766 , version 1 (28-01-2020)

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H. Abdalla, R. Adam, F. Aharonian, F. Ait Benkhali, E. O. Angüner, et al.. H.E.S.S. detection of very high-energy γ-ray emission from the quasar PKS 0736+017. Astronomy and Astrophysics - A&A, 2020, 633, pp.A162. ⟨10.1051/0004-6361/201935906⟩. ⟨cea-02458766⟩
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