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Long-term TeV and X-ray Observations of the Gamma-ray Binary HESS J0632+057

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arxiv 1311.6083 v1 pith:RHKKDYOU submitted 2013-11-24 astro-ph.HE

VERITAS Collaboration , E. Aliu , S. Archambault , T. Aune , B. Behera , M. Beilicke , W. Benbow , K. Berger
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R. Bird A. Bouvier J. H. Buckley V. Bugaev K. Byrum M. Cerruti X. Chen L. Ciupik M. P. Connolly W. Cui C. Duke J. Dumm M. Errando A. Falcone S. Federici Q. Feng J. P. Finley P. Fortin L. Fortson A. Furniss N. Galante G. H. Gillanders S. Griffin S. T. Griffiths J. Grube G. Gyuk D. Hanna J. Holder G. Hughes T. B. Humensky P. Kaaret M. Kertzman Y. Khassen D. Kieda H. Krawczynski F. Krennrich M. J. Lang A. S Madhavan G. Maier P. Majumdar A. McCann P. Moriarty R. Mukherjee D. Nieto A. O'Faoláin de Bhróithe R. A. Ong A. N. Otte N. Park J. S. Perkins M. Pohl A. Popkow H. Prokoph J. Quinn K. Ragan J. Rajotte L. C. Reyes P. T. Reynolds G. T. Richards E. Roache J. Rousselle G. H. Sembroski F. Sheidaei C. Skole A. W. Smith D. Staszak M. Stroh I. Telezhinsky M. Theiling J. V. Tucci J. Tyler A. Varlotta S. Vincent S. P. Wakely A. Weinstein R. Welsing D. A. Williams A. Zajczyk B. Zitzer H.E.S.S. Collaboration: A. Abramowski F. Aharonian F. Ait Benkhali A.G. Akhperjanian E. Angüner G. Anton S. Balenderan A. Balzer A. Barnacka Y. Becherini J. Becker Tjus K. Bernlöhr E. Birsin E. Bissaldi J. Biteau M. Böttcher C. Boisson J. Bolmont P. Bordas J. Brucker F. Brun P. Brun T. Bulik S. Carrigan S. Casanova P.M. Chadwick R. Chalme-Calvet R.C.G. Chaves A. Cheesebrough M. Chrétien S. Colafrancesco G. Cologna J. Conrad C. Couturier M. Dalton M.K. Daniel I.D. Davids B. Degrange C. Deil P. deWilt H.J. Dickinson A. Djannati-Ataï W. Domainko L.O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda T. Edwards K. Egberts P. Eger P. Espigat C. Farnier S. Fegan F. Feinstein M.V. Fernandes D. Fernandez A. Fiasson G. Fontaine A. For̈ster M. Fü{ss}ling M. Gajdus Y.A. Gallant T. Garrigoux G. Giavitto B. Giebels J.F. Glicenstein M.-H. Grondin M. Grudzińska S. Häffner J. Hahn J. Harris G. Heinzelmann G. Henri G. Hermann O. Hervet A. Hillert J.A. Hinton W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska C. Jahn M. Jamrozy M. Janiak F. Jankowsky I. Jung M.A. Kastendieck K. Katarzyński U. Katz S. Kaufmann B. Khélifi M. Kieffer S. Klepser D. Klochkov W. Kluźniak T. Kneiske D. Kolitzus Nu. Komin K. Kosack S. Krakau F. Krayzel P.P. Krüger H. Laffon G. Lamanna J. Lefaucheur A. Lemiére M. Lemoine-Goumard J.-P. Lenain D. Lennarz T. Lohse A. Lopatin C.-C. Lu V. Marandon A. Marcowith R. Marx G. Maurin N. Maxted M. Mayer T.J.L. McComb J. Méhault U. Menzler M. Meyer R. Moderski M. Mohamed E. Moulin T. Murach C.L. Naumann M. de Naurois J. Niemiec S.J. Nolan L. Oakes S. Ohm E. de Onña Wilhelmi B. Opitz M. Ostrowski I. Oya M. Panter R.D. Parsons M. Paz Arribas N.W. Pekeur G. Pelletier J. Perez P.-O. Petrucci B. Peyaud S. Pita H. Poon G. Pühlhofer M. Punch A. Quirrenbach S. Raab M. Raue A. Reimer O. Reimer M. Renaud R. de los Reyes F. Rieger L. Rob C. Romoli S. Rosier-Lees G. Rowell B. Rudak C.B. Rulten V. Sahakian D.A. Sanchez A. Santangelo R. Schlickeiser F. Schüssler A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer H. Sol G. Spengler F. Spies L.Stawarz R.Steenkamp C.Stegmann F.Stinzing K.Stycz I.Sushch A. Szostek J.-P. Tavernet T. Tavernier A.M. Taylor R. Terrier M. Tluczykont C. Trichard K. Valerius C. van Eldik G. Vasileiadis C. Venter A. Viana P. Vincent H.J. Völk F. Volpe M. Vorster S.J. Wagner P. Wagner M. Ward M. Weidinger Q. Weitzel R. White A. Wierzcholska P. Willmann A. Wörnlein D. Wouters M. Zacharias A.A. Zdziarski A. Zech H.-S. Zechlin
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classification astro-ph.HE
keywords x-raygamma-raydaysemissionhessj0632observationsorbital
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abstract

HESS J0632+057 is the only gamma-ray binary known so far whose position in the sky allows observations with ground-based observatories both in the northern and southern hemispheres. Here we report on long-term observations of HESS J0632+057 conducted with the VERITAS and H.E.S.S. Cherenkov Telescopes and the X-ray Satellite Swift, spanning a time range from 2004 to 2012 and covering most of the system's orbit. The VHE emission is found to be variable, and is correlated with that at X-ray energies. An orbital period of $315 ^{+6}_{-4}$ days is derived from the X-ray data set, which is compatible with previous results, $P = (321 \pm 5$) days. The VHE light curve shows a distinct maximum at orbital phases close to 0.3, or about 100 days after periastron passage, which coincides with the periodic enhancement of the X-ray emission. Furthermore, the analysis of the TeV data shows for the first time a statistically significant ($> 6.5 \sigma$) detection at orbital phases 0.6--0.9. The obtained gamma-ray and X-ray light curves and the correlation of the source emission at these two energy bands are discussed in the context of the recent ephemeris obtained for the system. Our results are compared to those reported for other gamma-ray binaries.

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  1. Combined VERITAS and NuSTAR observations of the gamma-ray binary HESS J0632+057

    astro-ph.HE 2019-08 conditional novelty 5.0 of 10

    New NuSTAR and VERITAS spectra of HESS J0632+057 are well fitted by a pulsar-wind shock model, yielding a degenerate constraint with wind magnetization around 0.003 to 0.03 at the shock.

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