Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.

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

doi:10.1051/0004-6361/201936761

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Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.

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Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.

H. Abdalla, R. Adam, F. Aharonian, F. Ait Benkhali, E. O. Angüner, M. Arakawa, C. Arcaro, C. Armand, T. Armstrong, H. Ashkar, …

Astronomy & Astrophysics - A&A, Vol.635

2020

DOI: https://doi.org/10.1051/0004-6361/201936761

Abstract

astroparticle physics

radiation mechanisms: non-thermal

binaries: general

stars: individual: η Car

stars: Wolf-Rayet

cosmic rays

<BR /> Aims: Colliding wind binary systems have long been suspected to be high-energy (HE; 100 MeV < E < 100 GeV) γ-ray emitters. η Car is the most prominent member of this object class and is confirmed to emit phase-locked HE γ rays from hundreds of MeV to ~100 GeV energies. This work aims to search for and characterise the very-high-energy (VHE; E >100 GeV) γ-ray emission from η Car around the last periastron passage in 2014 with the ground-based High Energy Stereoscopic System (H.E.S.S.). <BR /> Methods: The region around η Car was observed with H.E.S.S. between orbital phase p = 0.78-1.10, with a closer sampling at p ≈ 0.95 and p ≈ 1.10 (assuming a period of 2023 days). Optimised hardware settings as well as adjustments to the data reduction, reconstruction, and signal selection were needed to suppress and take into account the strong, extended, and inhomogeneous night sky background (NSB) in the η Car field of view. Tailored run-wise Monte-Carlo simulations (RWS) were required to accurately treat the additional noise from NSB photons in the instrument response functions. <BR /> Results: H.E.S.S. detected VHE γ-ray emission from the direction of η Car shortly before and after the minimum in the X-ray light-curve close to periastron. Using the point spread function provided by RWS, the reconstructed signal is point-like and the spectrum is best described by a power law. The overall flux and spectral index in VHE γ rays agree within statistical and systematic errors before and after periastron. The γ-ray spectrum extends up to at least ~400 GeV. This implies a maximum magnetic field in a leptonic scenario in the emission region of 0.5 Gauss. No indication for phase-locked flux variations is detected in the H.E.S.S. data.

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Title: Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.
Creators - without role: H. Abdalla - North-West University
R. Adam - Centre National de la Recherche Scientifique
F. Aharonian - Max Planck Institute for Nuclear Physics
F. Ait Benkhali
E. O. Angüner - Aix-Marseille Université
M. Arakawa - Rikkyo University
C. Arcaro - North-West University
C. Armand - Laboratoire d’Annecy de Physique des Particules
T. Armstrong - University of Oxford
H. Ashkar - Institut de Recherche sur les Lois Fondamentales de l'Univers
M. Backes - University of Namibia
V. Barbosa Martins
M. Barnard - North-West University
Y. Becherini - Linnaeus University
D. Berge
K. Bernlöhr - Max Planck Institute for Nuclear Physics
R. Blackwell - University of Adelaide
M. Böttcher - North-West University
C. Boisson - Délégation Paris 7
J. Bolmont - Laboratoire de Physique Nucléaire et de Hautes Énergies
S. Bonnefoy
J. Bregeon - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
M. Breuhaus - Max Planck Institute for Nuclear Physics
F. Brun - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
P. Brun - Institut de Recherche sur les Lois Fondamentales de l'Univers
M. Bryan - University of Amsterdam
M. Büchele - Friedrich-Alexander-Universität Erlangen-Nürnberg
T. Bulik - University of Warsaw
T. Bylund - Linnaeus University
S. Caroff - Université Paris Cité
A. Carosi - Laboratoire d’Annecy de Physique des Particules
S. Casanova - Max Planck Institute for Nuclear Physics
M. Cerruti - Sorbonne Paris Cité
T. Chand - North-West University
S. Chandra - North-West University
A. Chen - University of the Witwatersrand
S. Colafrancesco - University of the Witwatersrand
G. Cotter - University of Oxford
M. Curyło - University of Warsaw
I. D. Davids - University of Namibia
J. Davies - University of Oxford
C. Deil - Max Planck Institute for Nuclear Physics
J. Devin - Institut National de Physique Nucléaire et de Physique des Particules
P. Dewilt - University of Adelaide
L. Dirson - Universität Hamburg
A. Djannati-Ataï - AstroParticule et Cosmologie
A. Dmytriiev - Université Paris Sciences et Lettres
A. Donath - Max Planck Institute for Nuclear Physics
V. Doroshenko - University of Tübingen
J. Dyks - Polish Academy of Sciences
K. Egberts - University of Potsdam
F. Eichhorn - Friedrich-Alexander-Universität Erlangen-Nürnberg
G. Emery - Sorbonne Paris Cité
J. -P. Ernenwein - Centre National de la Recherche Scientifique
S. Eschbach - Friedrich-Alexander-Universität Erlangen-Nürnberg
K. Feijen - University of Adelaide
S. Fegan - Laboratoire Leprince-Ringuet
A. Fiasson - Laboratoire d’Annecy de Physique des Particules
G. Fontaine - Laboratoire Leprince-Ringuet
S. Funk - Friedrich-Alexander-Universität Erlangen-Nürnberg
M. Füßling
S. Gabici - Université Paris Cité
Y. A. Gallant - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
F. Gaté - Laboratoire d’Annecy de Physique des Particules
G. Giavitto
L. Giunti - Délégation Paris 7
D. Glawion - Heidelberg University
J. F. Glicenstein - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
D. Gottschall - University of Tübingen
M. -H. Grondin - Laboratoire de Physique des deux infinis Bordeaux
J. Hahn - Max Planck Institute for Nuclear Physics
M. Haupt
G. Heinzelmann - Universität Hamburg
G. Henri - Centre National de la Recherche Scientifique
G. Hermann - Max Planck Institute for Nuclear Physics
J. A. Hinton - Max Planck Institute for Nuclear Physics
W. Hofmann - Max Planck Institute for Nuclear Physics
C. Hoischen - University of Potsdam
T. L. Holch - Humboldt-Universität zu Berlin
M. Holler - Universität Innsbruck
M. Hörbe - University of Oxford
D. Horns - Universität Hamburg
D. Huber - Universität Innsbruck
H. Iwasaki - Rikkyo University
M. Jamrozy - Jagiellonian University
D. Jankowsky - Friedrich-Alexander-Universität Erlangen-Nürnberg
F. Jankowsky - Heidelberg University
A. Jardin-Blicq - Max Planck Institute for Nuclear Physics
V. Joshi - Friedrich-Alexander-Universität Erlangen-Nürnberg
I. Jung-Richardt - Friedrich-Alexander-Universität Erlangen-Nürnberg
M. A. Kastendieck - Universität Hamburg
K. Katarzyński - Nicolaus Copernicus University
M. Katsuragawa - Kavli Institute for the Physics and Mathematics of the Universe
U. Katz - Friedrich-Alexander-Universität Erlangen-Nürnberg
D. Khangulyan - Rikkyo University
B. Khélifi - Délégation Paris 7
J. King - Heidelberg University
S. Klepser
W. Kluźniak - Nicolaus Copernicus Astronomical Center
Nu. Komin - University of the Witwatersrand
K. Kosack - Institut de Recherche sur les Lois Fondamentales de l'Univers
D. Kostunin
M. Kreter - North-West University
G. Lamanna - Centre National de la Recherche Scientifique
A. Lemière - Centre National de la Recherche Scientifique
M. Lemoine-Goumard - Laboratoire de Physique des deux infinis Bordeaux
J. -P. Lenain - Laboratoire de Physique Nucléaire et de Hautes Énergies
E. Leser - University of Potsdam
C. Levy - Laboratoire de Physique Nucléaire et de Hautes Énergies
T. Lohse - Humboldt-Universität zu Berlin
I. Lypova
J. Mackey - Dublin Institute For Advanced Studies
J. Majumdar
D. Malyshev - Friedrich-Alexander-Universität Erlangen-Nürnberg
D. Malyshev - Friedrich-Alexander-Universität Erlangen-Nürnberg
V. Marandon - Max Planck Institute for Nuclear Physics
P. Marchegiani
A. Marcowith - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
A. Mares - Laboratoire de Physique des deux infinis Bordeaux
G. Martí-Devesa - Universität Innsbruck
R. Marx - Max Planck Institute for Nuclear Physics
G. Maurin - Centre National de la Recherche Scientifique
P. J. Meintjes - University of the Free State
R. Moderski - Polish Academy of Sciences
M. Mohamed - Heidelberg University
L. Mohrmann - Friedrich-Alexander-Universität Erlangen-Nürnberg
C. Moore - University of Leicester
P. Morris - University of Oxford
E. Moulin - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
J. Muller - École Polytechnique
T. Murach
S. Nakashima - Friedrich-Alexander-Universität Erlangen-Nürnberg
K. Nakashima - Friedrich-Alexander-Universität Erlangen-Nürnberg
M. de Naurois - Laboratoire Leprince-Ringuet
H. Ndiyavala - North-West University
F. Niederwanger - Universität Innsbruck
J. Niemiec - Institute of Nuclear Physics, Polish Academy of Sciences
L. Oakes - Humboldt-Universität zu Berlin
P. O'Brien
H. Odaka - The University of Tokyo
S. Ohm
E. de Ona Wilhelmi
M. Ostrowski - Jagiellonian University
M. Panter - Max Planck Institute for Nuclear Physics
R. D. Parsons - Max Planck Institute for Nuclear Physics
C. Perennes - Laboratoire de Physique Nucléaire et de Hautes Énergies
P. -O. Petrucci - Centre National de la Recherche Scientifique
B. Peyaud - Université Paris-Saclay
Q. Piel - Laboratoire d’Annecy de Physique des Particules
S. Pita - Université Paris Cité
V. Poireau - Centre National de la Recherche Scientifique
A. Priyana Noel
D. A. Prokhorov - University of the Witwatersrand
H. Prokoph
G. Pühlhofer - University of Tübingen
M. Punch - Délégation Paris 7
A. Quirrenbach - Heidelberg University
S. Raab - Friedrich-Alexander-Universität Erlangen-Nürnberg
R. Rauth - Universität Innsbruck
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
Q. Remy - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
M. Renaud - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
F. Rieger - Max Planck Institute for Nuclear Physics
L. Rinchiuso - Université Paris-Saclay
C. Romoli - Max Planck Institute for Nuclear Physics
G. Rowell - University of Adelaide
B. Rudak - Nicolaus Copernicus Astronomical Center
E. Ruiz-Velasco - Max Planck Institute for Nuclear Physics
V. Sahakian - A. Alikhanyan National Laboratory
S. Sailer - Max Planck Institute for Nuclear Physics
S. Saito - Rikkyo University
D. A. Sanchez - Centre National de la Recherche Scientifique
A. Santangelo - University of Tübingen
M. Sasaki - Friedrich-Alexander-Universität Erlangen-Nürnberg
M. Scalici - University of Tübingen
R. Schlickeiser - Ruhr University Bochum
F. Schüssler
A. Schulz
H. M. Schutte - North-West University
U. Schwanke - Humboldt-Universität zu Berlin
S. Schwemmer - Heidelberg University
M. Seglar-Arroyo - Institut de Recherche sur les Lois Fondamentales de l'Univers
M. Senniappan - Linnaeus University
A. S. Seyffert - North-West University
N. Shafi - University of the Witwatersrand
K. Shiningayamwe - University of Namibia
R. Simoni - University of Amsterdam
A. Sinha - Délégation Paris 7
H. Sol - Délégation Paris 7
A. Specovius - Friedrich-Alexander-Universität Erlangen-Nürnberg
S. Spencer - University of Oxford
M. Spir-Jacob - Délégation Paris 7
Ł. Stawarz - Jagiellonian University
R. Steenkamp - University of Namibia
C. Stegmann - University of Potsdam
C. Steppa - University of Potsdam
T. Takahashi - Kavli Institute for the Physics and Mathematics of the Universe
T. Tavernier - CEA Paris-Saclay
A. M. Taylor
R. Terrier - Délégation Paris 7
D. Tiziani - Friedrich-Alexander-Universität Erlangen-Nürnberg
M. Tluczykont - Universität Hamburg
L. Tomankova - Friedrich-Alexander-Universität Erlangen-Nürnberg
C. Trichard - Laboratoire Leprince-Ringuet
M. Tsirou - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
N. Tsuji - Rikkyo University
R. Tuffs - Max Planck Institute for Nuclear Physics
Y. Uchiyama - Rikkyo University
D. J. van der Walt - North-West University
C. van Eldik - Friedrich-Alexander-Universität Erlangen-Nürnberg
C. van Rensburg - North-West University
B. van Soelen - University of the Free State
G. Vasileiadis - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
J. Veh - Friedrich-Alexander-Universität Erlangen-Nürnberg
C. Venter - North-West University
P. Vincent - Sorbonne Paris Cité
J. Vink - University of Amsterdam
H. J. Völk - Max Planck Institute for Nuclear Physics
T. Vuillaume - Laboratoire d’Annecy de Physique des Particules
Z. Wadiasingh - North-West University
S. J. Wagner - Heidelberg University
J. Watson - University of Oxford
F. Werner - Max Planck Institute for Nuclear Physics
R. White - Max Planck Institute for Nuclear Physics
A. Wierzcholska - Heidelberg University
R. Yang - Max Planck Institute for Nuclear Physics
H. Yoneda - Kavli Institute for the Physics and Mathematics of the Universe
M. Zacharias - North-West University
R. Zanin - Max Planck Institute for Nuclear Physics
A. A. Zdziarski - Nicolaus Copernicus Astronomical Center
A. Zech - Centre National de la Recherche Scientifique
J. Zorn - Max Planck Institute for Nuclear Physics
N. Żywucka - North-West University
Publication Details: Astronomy & Astrophysics - A&A, Vol.635
Identifiers: 9935277809311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: insu-03705219