H.E.S.S. detection of very high-energy γ-ray emission from the quasar PKS 0736+017 - CEA - Commissariat à l’énergie atomique et aux énergies alternatives 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

H. Abdalla , R. Adam (1) , F. Aharonian , F. Ait Benkhali , E. O. Angüner (2) , M. Arakawa , C. Arcaro , C. Armand (3) , H. Ashkar (4) , M. Backes , V. Barbosa Martins (5) , M. Barnard , Y. Becherini , D. Berge (5) , K. Bernlöhr , R. Blackwell , M. Böttcher , C. Boisson (6) , J. Bolmont (7) , S. Bonnefoy (5) , J. Bregeon (8) , M. Breuhaus , F. Brun (4) , P. Brun (4) , M. Bryan , M. Büchele , T. Bulik , T. Bylund , M. Capasso , S. Caroff (7) , A. Carosi (3) , S. Casanova , M. Cerruti (7) , T. Chand , S. Chandra , A. Chen , S. Colafrancesco , M. Curyło , I. D. Davids , C. Deil , J. Devin (9) , P. Dewilt , L. Dirson , A. Djannati-Ataï (10) , A. Dmytriiev (6) , A. Donath , V. Doroshenko , L. O’c. Drury , J. Dyks , K. Egberts , G. Emery (7) , J.-P. Ernenwein (2) , S. Eschbach , K. Feijen , S. Fegan (1) , A. Fiasson (3) , G. Fontaine (1) , S. Funk , M. Füssling (5) , S. Gabici (10) , Y. A. Gallant (8) , F. Gaté (3) , G. Giavitto (5) , D. Glawion , J. F. Glicenstein (4) , D. Gottschall , M.-H. Grondin (9) , J. Hahn , M. Haupt (5) , G. Heinzelmann , G. Henri (11) , G. Hermann , J. A. Hinton , W. Hofmann , C. Hoischen , T. L. Holch , M. Holler , D. Horns , D. Huber , H. Iwasaki , M. Jamrozy , D. Jankowsky , F. Jankowsky , A. Jardin-Blicq , I. Jung-Richardt , M. A. Kastendieck , K. Katarzyński , M. Katsuragawa , U. Katz , D. Khangulyan , B. Khélifi (10) , J. King , S. Klepser (5) , W. Kluźniak , Nu. Komin , K. Kosack (4) , D. Kostunin (5) , M. Kraus , G. Lamanna (3) , J. Lau , A. Lemière (10) , M. Lemoine-Goumard (9) , J.-P. Lenain (7) , E. Leser (5) , C. Levy (7) , T. Lohse , I. Lypova (5) , J. Mackey , J. Majumdar (5) , D. Malyshev , V. Marandon , Alexandre Marcowith (8) , A. Mares (9) , C. Mariaud (1) , G. Martí-Devesa , R. Marx , G. Maurin (3) , P. J. Meintjes , A. M. W. Mitchell , R. Moderski , M. Mohamed , L. Mohrmann , J. Muller (1) , C. Moore , Emmanuel Moulin (4) , T. Murach (5) , S. Nakashima , M. de Naurois (1) , H. Ndiyavala , F. Niederwanger , J. Niemiec , L. Oakes , P. O’brien , H. Odaka , S. Ohm (5) , E. de Oña Wilhelmi (5) , M. Ostrowski , I. Oya (5) , M. Panter , R. D. Parsons , C. Perennes (7) , P.-O. Petrucci (11) , B. Peyaud (4) , Q. Piel (3) , S. Pita (10) , V. Poireau (3) , A. Priyana Noel , D. A. Prokhorov , H. Prokoph (5) , G. Pühlhofer , M. Punch (10) , A. Quirrenbach , S. Raab , R. Rauth , A. Reimer , O. Reimer , Q. Remy (8) , Matthieu Renaud (8) , F. Rieger , L. Rinchiuso (4) , C. Romoli , G. Rowell , B. Rudak , E. Ruiz-Velasco , V. Sahakian , S. Saito , D. A. Sanchez (3) , A. Santangelo , M. Sasaki , R. Schlickeiser , F. Schüssler (4) , A. Schulz (5) , H. Schutte , U. Schwanke , S. Schwemmer , M. Seglar-Arroyo (4) , M. Senniappan , A. S. Seyffert , N. Shafi , K. Shiningayamwe , R. Simoni , A. Sinha (10) , H. Sol (6) , A. Specovius , M. Spir-Jacob (10) , Ł. Stawarz , R. Steenkamp , C. Stegmann (5) , C. Steppa , T. Takahashi (12) , T. Tavernier (4) , A. M. Taylor (5) , R. Terrier (10) , D. Tiziani , M. Tluczykont , C. Trichard (1) , M. Tsirou (8) , N. Tsuji , R. Tuffs , Y. Uchiyama , D. J. van Der Walt , C. van Eldik , C. van Rensburg , B. van Soelen , George Vasileiadis (8) , J. Veh , C. Venter , P. Vincent (7) , J. Vink , F. Voisin , H. J. Völk , T. Vuillaume (3) , Z. Wadiasingh , S. J. Wagner , R. White (13) , A. Wierzcholska , R. Yang (13) , H. Yoneda , M. Zacharias , R. Zanin , A. A. Zdziarski , A. Zech (6) , A. Ziegler , J. Zorn , N. Żywucka , P. S. Smith
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
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
M.-H. Grondin
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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