Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856

A. Abramowski; F. Aharonian; F. Ait Benkhali; A. G. Akhperjanian; E. O. Angüner; M. Backes; Agnès Balzer; Y. Becherini; J. Becker Tjus; D. Berge; S. Bernhard; K. Bernlöhr; E. Birsin; R. Blackwell; M. Böttcher; C. Boisson; J. Bolmont; P. Bordas; J. Bregeon; F. Brun; P. Brun; M. Bryan; T. Bulik; J. Carr; S. Casanova; N. Chakraborty; R. Chalme-Calvet; R. C. G. Chaves; A. Chen; M. Chrétien; S. Colafrancesco; G. Cologna; J. Conrad; C. Couturier; Y. Cui; I. D. Davids; B. Degrange; C. Deil; P. Dewilt; A. Djannati-Ataï; W. Domainko; A. Donath; L. O'C. Drury; G. Dubus; K. Dutson; J. Dyks; M. Dyrda; T. Edwards; K. Egberts; P. Eger; J.-P. Ernenwein; P. Espigat; C. Farnier; S. Fegan; F. Feinstein; M. V. Fernandes; D. Fernandez; A. Fiasson; G. Fontaine; A. Förster; M. Füssling; S. Gabici; M. Gajdus; Y. A. Gallant; T. Garrigoux; G. Giavitto; B. Giebels; J. F. Glicenstein; D. Gottschall; A. Goyal; M. -H. Grondin; M. Grudzińska; D. Hadasch; S. Häffner; J. Hahn; J. Hawkes; G. Heinzelmann; G. Henri; G. Hermann; O. Hervet; A. Hillert; J. A. Hinton; W. Hofmann; P. Hofverberg; C. Hoischen; M. Holler; D. Horns; A. Ivascenko; A. Jacholkowska; C. Jahn; M. Jamrozy; M. Janiak; F. Jankowsky; I. Jung-Richardt; M. A. Kastendieck; K. Katarzyński; U. Katz; D. Kerszberg; B. Khélifi; Michel Kieffer; S. Klepser; D. Klochkov; W. Kluźniak; D. Kolitzus; Nu. Komin; K. Kosack; S. Krakau; F. Krayzel; P. P. Krüger; H. Laffon; G. Lamanna; J. Lau; J. Lefaucheur; V. Lefranc; A. Lemière; M. Lemoine-Goumard; J. -P. Lenain; T. Lohse; A. Lopatin; C. -C. Lu; R. Lui; V. Marandon; Alexandre Marcowith; C. Mariaud; R. Marx; G. Maurin; N. Maxted; M. Mayer; P. J. Meintjes; U. Menzler; M. Meyer; A. M. W. Mitchell; R. Moderski; M. Mohamed; K. Morå; Emmanuel Moulin; T. Murach; M. de Naurois; J. Niemiec; L. Oakes; H. Odaka; S. Öttl; S. Ohm; E. de Oña Wilhelmi; B. Opitz; M. Ostrowski; I. Oya; M. Panter; R. D. Parsons; M. Paz Arribas; N. W. Pekeur; G. Pelletier; P. -O. Petrucci; B. Peyaud; S. Pita; H. Poon; H. Prokoph; G. Pühlhofer; M. Punch; A. Quirrenbach; S. Raab; I. Reichardt; A. Reimer; O. Reimer; Matthieu Renaud; R. de Los Reyes; F. Rieger; C. Romoli; S. Rosier-Lees; G. Rowell; B. Rudak; C. B. Rulten; V. Sahakian; D. Salek; D. A. Sanchez; A. Santangelo; M. Sasaki; R. Schlickeiser; F. Schüssler; A. Schulz; U. Schwanke; S. Schwemmer; A. S. Seyffert; R. Simoni; H. Sol; F. Spanier; G. Spengler; F. Spies; Ł. Stawarz; R. Steenkamp; C. Stegmann; F. Stinzing; K. Stycz; I. Sushch; J. -P. Tavernet; T. Tavernier; A. M. Taylor; R. Terrier; M. Tluczykont; C. Trichard; K. Valerius; J. van Der Walt; C. van Eldik; B. van Soelen; George Vasileiadis; J. Veh; C. Venter; A. Viana; P. Vincent; J. Vink; F. Voisin; H. J. Völk; T. Vuillaume; S. J. Wagner; P. Wagner; R. M. Wagner; M. Weidinger; Q. Weitzel; R. White; A. Wierzcholska; P. Willmann; A. Wörnlein; D. Wouters; R. Yang; V. Zabalza; D. Zaborov; M. Zacharias; A. A. Zdziarski; A. Zech; F. Zefi; N. Żywucka

doi:10.1051/0004-6361/201525699

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Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856

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Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856

A. Abramowski, F. Aharonian, F. Ait Benkhali, A. G. Akhperjanian, E. O. Angüner, M. Backes, Agnès Balzer, Y. Becherini, J. Becker Tjus, D. Berge, …

Astronomy & Astrophysics - A&A, Vol.577

2015

DOI: https://doi.org/10.1051/0004-6361/201525699

Abstract

Re-observations with the H.E.S.S. telescope array of the very-high-energy (VHE) source HESS J1018-589 A coincident with the Fermi-LAT $\gamma$-ray binary 1FGL J1018.6-5856 have resulted in a source detection significance of more than 9$\sigma$, and the detection of variability ($\chi^2$/$\nu$ of 238.3/155) in the emitted $\gamma$-ray flux. This variability confirms the association of HESS J1018-589 A with the high-energy $\gamma$-ray binary detected by Fermi-LAT, and also confirms the point-like source as a new very-high-energy binary system. The spectrum of HESS J1018-589 A is best fit with a power-law function with photon index $\Gamma = 2.20 \pm 0.14_{\rm stat} \pm 0.2_{\rm sys}$. Emission is detected up to ~20 TeV. The mean differential flux level is $(2.9 \pm 0.4)\times10^{-13}$ TeV$^{-1}$ cm$^{-2}$ s$^{-1}$ at 1 TeV, equivalent to ~1% of the flux from the Crab Nebula at the same energy. Variability is clearly detected in the night-by-night lightcurve. When folded on the orbital period of 16.58 days, the rebinned lightcurve peaks in phase with the observed X-ray and high-energy phaseograms. The fit of the H.E.S.S. phaseogram to a constant flux provides evidence of periodicity at the level of 3$\sigma$. The shape of the VHE phaseogram and measured spectrum suggest a low inclination, low eccentricity system with a modest impact from VHE $\gamma$-ray absorption due to pair production ($\tau$ < 1 at 300 GeV).

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Title: Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856
Creators - without role: A. Abramowski - Universität Hamburg
F. Aharonian - Dublin Institute For Advanced Studies
F. Ait Benkhali - Max Planck Institute for Nuclear Physics
A. G. Akhperjanian - National Academy of Sciences of Armenia
E. O. Angüner - Humboldt-Universität zu Berlin
M. Backes - University of Namibia
Agnès Balzer - University of Amsterdam
Y. Becherini - Linnaeus University
J. Becker Tjus - Ruhr University Bochum
D. Berge - University of Amsterdam
S. Bernhard - Universität Innsbruck
K. Bernlöhr - Max Planck Institute for Nuclear Physics
E. Birsin - Humboldt-Universität zu Berlin
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
P. Bordas - Max Planck Institute for Nuclear Physics
J. Bregeon - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
F. Brun - Institut de Recherche sur les Lois Fondamentales de l'Univers
P. Brun - CEA Paris-Saclay
M. Bryan - University of Amsterdam
T. Bulik - University of Warsaw
J. Carr - Aix-Marseille Université
S. Casanova - Max Planck Institute for Nuclear Physics
N. Chakraborty - Max Planck Institute for Nuclear Physics
R. Chalme-Calvet - Sorbonne Université
R. C. G. Chaves - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
A. Chen - University of the Witwatersrand
M. Chrétien - Sorbonne Université
S. Colafrancesco - University of the Witwatersrand
G. Cologna - Heidelberg University
J. Conrad - Stockholm University
C. Couturier - Sorbonne Université
Y. Cui - University of Tübingen
I. D. Davids - North-West University
B. Degrange - École Polytechnique
C. Deil - Max Planck Institute for Nuclear Physics
P. Dewilt - University of Adelaide
A. Djannati-Ataï - AstroParticule et Cosmologie
W. Domainko - Max Planck Institute for Nuclear Physics
A. Donath - Max Planck Institute for Nuclear Physics
L. O'C. Drury
G. Dubus - Institut de Planétologie et d'Astrophysique de Grenoble
K. Dutson - University of Leicester
J. Dyks - Nicolaus Copernicus Astronomical Center
M. Dyrda - Institute of Nuclear Physics, Polish Academy of Sciences
T. Edwards - Max Planck Institute for Nuclear Physics
K. Egberts - University of Potsdam
P. Eger - Max Planck Institute for Nuclear Physics
J.-P. Ernenwein - Aix-Marseille Université
P. Espigat - Université Paris Cité
C. Farnier - Stockholm University
S. Fegan - Centre National de la Recherche Scientifique
F. Feinstein - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
M. V. Fernandes - Universität Hamburg
D. Fernandez - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
A. Fiasson - Laboratoire d’Annecy de Physique des Particules
G. Fontaine - Laboratoire Leprince-Ringuet
A. Förster - Max Planck Institute for Nuclear Physics
M. Füssling
S. Gabici - Université Paris Cité
M. Gajdus - Humboldt-Universität zu Berlin
Y. A. Gallant - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Garrigoux - Laboratoire de Physique Nucléaire et de Hautes Énergies
G. Giavitto
B. Giebels - Laboratoire Leprince-Ringuet
J. F. Glicenstein - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
D. Gottschall - University of Tübingen
A. Goyal - Jagiellonian University
M. -H. Grondin - Laboratoire de Physique des deux infinis Bordeaux
M. Grudzińska - University of Warsaw
D. Hadasch - Universität Innsbruck
S. Häffner - Friedrich-Alexander-Universität Erlangen-Nürnberg
J. Hahn - Max Planck Institute for Nuclear Physics
J. Hawkes - University of Adelaide
G. Heinzelmann - Universität Hamburg
G. Henri - Centre National de la Recherche Scientifique
G. Hermann - Max Planck Institute for Nuclear Physics
O. Hervet - Délégation Paris 7
A. Hillert - Max Planck Institute for Nuclear Physics
J. A. Hinton - University of Leicester
W. Hofmann - Max Planck Institute for Nuclear Physics
P. Hofverberg - Max Planck Institute for Nuclear Physics
C. Hoischen - University of Potsdam
M. Holler - École Polytechnique
D. Horns - Universität Hamburg
A. Ivascenko - North-West University
A. Jacholkowska - Laboratoire de Physique Nucléaire et de Hautes Énergies
C. Jahn - Friedrich-Alexander-Universität Erlangen-Nürnberg
M. Jamrozy - Jagiellonian University
M. Janiak - Nicolaus Copernicus Astronomical Center
F. Jankowsky - Heidelberg University
I. Jung-Richardt - Friedrich-Alexander-Universität Erlangen-Nürnberg
M. A. Kastendieck - Universität Hamburg
K. Katarzyński - Nicolaus Copernicus University
U. Katz - Friedrich-Alexander-Universität Erlangen-Nürnberg
D. Kerszberg - Laboratoire de Physique Nucléaire et de Hautes Énergies
B. Khélifi - Délégation Paris 7
Michel Kieffer - Sorbonne Université
S. Klepser
D. Klochkov - University of Tübingen
W. Kluźniak - Nicolaus Copernicus Astronomical Center
D. Kolitzus - Universität Innsbruck
Nu. Komin - University of the Witwatersrand
K. Kosack - Institut de Recherche sur les Lois Fondamentales de l'Univers
S. Krakau - Ruhr University Bochum
F. Krayzel - Laboratoire d’Annecy de Physique des Particules
P. P. Krüger - North-West University
H. Laffon - Laboratoire de Physique des deux infinis Bordeaux
G. Lamanna - Université Savoie Mont Blanc
J. Lau - University of Adelaide
J. Lefaucheur - Sorbonne Paris Cité
V. Lefranc - Institut de Recherche sur les Lois Fondamentales de l'Univers
A. Lemière - Sorbonne Paris Cité
M. Lemoine-Goumard - Institut National de Physique Nucléaire et de Physique des Particules
J. -P. Lenain - Sorbonne Université
T. Lohse - Humboldt-Universität zu Berlin
A. Lopatin - Friedrich-Alexander-Universität Erlangen-Nürnberg
C. -C. Lu - Max Planck Institute for Nuclear Physics
R. Lui - Max Planck Institute for Nuclear Physics
V. Marandon - Max Planck Institute for Nuclear Physics
Alexandre Marcowith - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
C. Mariaud - Laboratoire Leprince-Ringuet
R. Marx - Max Planck Institute for Nuclear Physics
G. Maurin - Laboratoire d’Annecy de Physique des Particules
N. Maxted - Laboratoire Univers et Particules de Montpellier
M. Mayer - Humboldt-Universität zu Berlin
P. J. Meintjes - University of the Free State
U. Menzler - Ruhr University Bochum
M. Meyer - Stockholm University
A. M. W. Mitchell
R. Moderski - Nicolaus Copernicus Astronomical Center
M. Mohamed - Heidelberg University
K. Morå - Stockholm University
Emmanuel Moulin - CEA Paris-Saclay
T. Murach - Humboldt-Universität zu Berlin
M. de Naurois - École Polytechnique
J. Niemiec - Institute of Nuclear Physics, Polish Academy of Sciences
L. Oakes - Humboldt-Universität zu Berlin
H. Odaka - Max Planck Institute for Nuclear Physics
S. Öttl - Universität Innsbruck
S. Ohm
E. de Oña Wilhelmi
B. Opitz - Universität Hamburg
M. Ostrowski - Jagiellonian University
I. Oya
M. Panter - Max Planck Institute for Nuclear Physics
R. D. Parsons - Max Planck Institute for Nuclear Physics
M. Paz Arribas - Humboldt-Universität zu Berlin
N. W. Pekeur - North-West University
G. Pelletier - Centre National de la Recherche Scientifique
P. -O. Petrucci - Institut de Planétologie et d'Astrophysique de Grenoble
B. Peyaud - CEA Paris-Saclay
S. Pita - Sorbonne Paris Cité
H. Poon - Max Planck Institute for Nuclear Physics
H. Prokoph - Linnaeus University
G. Pühlhofer - University of Tübingen
M. Punch - Délégation Paris 7
A. Quirrenbach - Heidelberg University
S. Raab - Friedrich-Alexander-Universität Erlangen-Nürnberg
I. Reichardt - Délégation Paris 7
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
Matthieu Renaud - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
R. de Los Reyes
F. Rieger - Max Planck Institute for Nuclear Physics
C. Romoli - Dublin Institute For Advanced Studies
S. Rosier-Lees - Laboratoire d’Annecy de Physique des Particules
G. Rowell - University of Adelaide
B. Rudak - Nicolaus Copernicus Astronomical Center
C. B. Rulten - Délégation Paris 7
V. Sahakian - A. Alikhanyan National Laboratory
D. Salek - University of Amsterdam
D. A. Sanchez - Centre National de la Recherche Scientifique
A. Santangelo - University of Tübingen
M. Sasaki - University of Tübingen
R. Schlickeiser - Ruhr University Bochum
F. Schüssler
A. Schulz
U. Schwanke - Humboldt-Universität zu Berlin
S. Schwemmer - Heidelberg University
A. S. Seyffert - North-West University
R. Simoni - University of Amsterdam
H. Sol - Université Paris Cité
F. Spanier - North-West University
G. Spengler - Stockholm University
F. Spies - Universität Hamburg
Ł. Stawarz - Jagiellonian University
R. Steenkamp - University of Namibia
C. Stegmann - University of Potsdam
F. Stinzing - Friedrich-Alexander-Universität Erlangen-Nürnberg
K. Stycz
I. Sushch - North-West University
J. -P. Tavernet - Laboratoire de Physique Nucléaire et de Hautes Énergies
T. Tavernier - Délégation Paris 7
A. M. Taylor - Dublin Institute For Advanced Studies
R. Terrier - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
M. Tluczykont - Universität Hamburg
C. Trichard - Laboratoire d’Annecy de Physique des Particules
K. Valerius - Friedrich-Alexander-Universität Erlangen-Nürnberg
J. van Der Walt
C. van Eldik - Friedrich-Alexander-Universität Erlangen-Nürnberg
B. van Soelen - University of the Free State
George Vasileiadis - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
J. Veh - Friedrich-Alexander-Universität Erlangen-Nürnberg
C. Venter - North-West University
A. Viana - Max Planck Institute for Nuclear Physics
P. Vincent - Laboratoire de Physique Nucléaire et de Hautes Énergies
J. Vink - University of Amsterdam
F. Voisin - University of Adelaide
H. J. Völk - Max Planck Institute for Nuclear Physics
T. Vuillaume - Institut de Planétologie et d'Astrophysique de Grenoble
S. J. Wagner - Heidelberg University
P. Wagner - Humboldt-Universität zu Berlin
R. M. Wagner - Stockholm University
M. Weidinger - Ruhr University Bochum
Q. Weitzel - Max Planck Institute for Nuclear Physics
R. White - University of Leicester
A. Wierzcholska - Heidelberg University
P. Willmann - Friedrich-Alexander-Universität Erlangen-Nürnberg
A. Wörnlein - Friedrich-Alexander-Universität Erlangen-Nürnberg
D. Wouters - Institut de Recherche sur les Lois Fondamentales de l'Univers
R. Yang - Max Planck Institute for Nuclear Physics
V. Zabalza - University of Leicester
D. Zaborov - École Polytechnique
M. Zacharias - Heidelberg University
A. A. Zdziarski - Nicolaus Copernicus Astronomical Center
A. Zech - Université Paris Cité
F. Zefi - École Polytechnique
N. Żywucka - Jagiellonian University
Publication Details: Astronomy & Astrophysics - A&A, Vol.577
Identifiers: 9937845509311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-01139213