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Title: A NEW TeV BINARY: THE DISCOVERY OF AN ORBITAL PERIOD IN HESS J0632+057

Abstract

HESS J0632+057 is a variable, point-like source of very high energy (>100 GeV) gamma rays located in the Galactic plane. It is positionally coincident with a Be star, it is a variable radio and X-ray source, has a hard X-ray spectrum, and has low radio flux. These properties suggest that the object may be a member of the rare class of TeV/X-ray binary systems. The definitive confirmation of this would be the detection of a periodic orbital modulation of the flux at any wavelength. We have obtained Swift X-Ray Telescope observations of the source from MJD 54857 to 55647 (2009 January-2011 March) to test the hypothesis that HESS J0632+057 is an X-ray/TeV binary. We show that these data exhibit flux modulation with a period of 321 {+-} 5 days and we evaluate the significance of this period by calculating the null hypothesis probability, allowing for stochastic flaring. This periodicity establishes the binary nature of HESS J0632+057.

Authors:
; ;  [1];  [2];  [3];  [4];  [5];  [6]
  1. Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)
  2. Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, DE 19716 (United States)
  3. Max-Plank-Institut fuer Kernphysik, Saupferchekweg, Bothe-Labor, D-69117 Heidelberg (Germany)
  4. Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH (United Kingdom)
  5. NASA Goddard Space Flight Center, Greenbelt, MD (United States)
  6. Alder Planetarium, Chicago, IL 60605 (United States)
Publication Date:
OSTI Identifier:
21562487
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 737; Journal Issue: 1; Other Information: DOI: 10.1088/2041-8205/737/1/L11; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; GAMMA RADIATION; HARD X RADIATION; X-RAY SOURCES; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; RADIATION SOURCES; RADIATIONS; STARS; X RADIATION

Citation Formats

Bongiorno, S D, Falcone, A D, Stroh, M, Holder, J, Skilton, J L, Hinton, J A, Gehrels, N, and Grube, J. A NEW TeV BINARY: THE DISCOVERY OF AN ORBITAL PERIOD IN HESS J0632+057. United States: N. p., 2011. Web. doi:10.1088/2041-8205/737/1/L11.
Bongiorno, S D, Falcone, A D, Stroh, M, Holder, J, Skilton, J L, Hinton, J A, Gehrels, N, & Grube, J. A NEW TeV BINARY: THE DISCOVERY OF AN ORBITAL PERIOD IN HESS J0632+057. United States. doi:10.1088/2041-8205/737/1/L11.
Bongiorno, S D, Falcone, A D, Stroh, M, Holder, J, Skilton, J L, Hinton, J A, Gehrels, N, and Grube, J. Wed . "A NEW TeV BINARY: THE DISCOVERY OF AN ORBITAL PERIOD IN HESS J0632+057". United States. doi:10.1088/2041-8205/737/1/L11.
@article{osti_21562487,
title = {A NEW TeV BINARY: THE DISCOVERY OF AN ORBITAL PERIOD IN HESS J0632+057},
author = {Bongiorno, S D and Falcone, A D and Stroh, M and Holder, J and Skilton, J L and Hinton, J A and Gehrels, N and Grube, J},
abstractNote = {HESS J0632+057 is a variable, point-like source of very high energy (>100 GeV) gamma rays located in the Galactic plane. It is positionally coincident with a Be star, it is a variable radio and X-ray source, has a hard X-ray spectrum, and has low radio flux. These properties suggest that the object may be a member of the rare class of TeV/X-ray binary systems. The definitive confirmation of this would be the detection of a periodic orbital modulation of the flux at any wavelength. We have obtained Swift X-Ray Telescope observations of the source from MJD 54857 to 55647 (2009 January-2011 March) to test the hypothesis that HESS J0632+057 is an X-ray/TeV binary. We show that these data exhibit flux modulation with a period of 321 {+-} 5 days and we evaluate the significance of this period by calculating the null hypothesis probability, allowing for stochastic flaring. This periodicity establishes the binary nature of HESS J0632+057.},
doi = {10.1088/2041-8205/737/1/L11},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 737,
place = {United States},
year = {2011},
month = {8}
}