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Long-term TeV and X-ray observations of the gamma-ray binary HESS J0632+057.

Aliu, E. and Archambault, S. and Aune, T. and Behera, B. and Beilicke, M. and Benbow, W. and Berger, K. and Bird, R. and Bouvier, A. and Buckley, J.H. and Bugaev, V. and Byrum, K. and Cerruti, M. and Chen, X. and Ciupik, L. and Connolly, M.P. and Cui, W. and Duke, C. and Dumm, J. and Errando, M. and Falcone, A. and Federici, S. and Feng, Q. and Finley, J.P. and Fortin, P. and Fortson, L. and Furniss, A. and Galante, N. and Gillanders, G.H. and Griffin, S. and Griffiths, S.T. and Grube, J. and Gyuk, G. and Hanna, D. and Holder, J. and Hughes, G. and Humensky, T.B. and Kaaret, P. and Kertzman, M. and Khassen, Y. and Kieda, D. and Krawczynski, H. and Krennrich, F. and Lang, M.J. and Madhavan, A.S. and Maier, G. and Majumdar, P. and McCann, A. and Moriarty, P. and Mukherjee, R. and Nieto, D. and O'Faoláin de Bhróithe, A. and Ong, R.A. and Otte, A.N. and Park, N. and Perkins, J.S. and Pohl, M. and Popkow, A. and Prokoph, H. and Quinn, J. and Ragan, K. and Rajotte, J. and Reyes, L.C. and Reynolds, P.T. and Richards, G.T. and Roache, E. and Rousselle, J. and Sembroski, G.H. and Sheidaei, F. and Skole, C. and Smith, A.W. and Staszak, D. and Stroh, M. and Telezhinsky, I. and Theiling, M. and Tucci, J.V. and Tyler, J. and Varlotta, A. and Vincent, S. and Wakely, S. 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(2014) 'Long-term TeV and X-ray observations of the gamma-ray binary HESS J0632+057.', Astrophysical journal., 780 (2). p. 168.

Abstract

HESS J0632+057 is the only gamma-ray binary known so far whose position in the sky allows observations with ground-based observatories in both the northern and southern hemispheres. Here we report on long-term observations of HESS J0632+057 conducted with the Very Energetic Radiation Imaging Telescope Array System and High Energy Stereoscopic System 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 very-high-energy (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 ± 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 (>6.5σ) 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.

Item Type:Article
Keywords:Acceleration of particles, Binaries: general, Gamma rays: general.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1088/0004-637X/780/2/168
Publisher statement:© 2013. The American Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:03 July 2014
Date of first online publication:January 2014
Date first made open access:No date available

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