A new TeV binary

The discovery of an orbital period in HESS J0632+057

S. D. Bongiorno, Abraham David Falcone, M. Stroh, J. Holder, J. L. Skilton, J. A. Hinton, N. Gehrels, J. Grube

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

HESS J0632+057 is a variable, point-like source of very high energy (>100GeV) 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 ofTeV/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.

Original languageEnglish (US)
Article numberL11
JournalAstrophysical Journal Letters
Volume737
Issue number1
DOIs
StatePublished - Aug 10 2011

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orbitals
x rays
radio
null hypothesis
modulation
point sources
periodicity
periodic variations
gamma rays
telescopes
wavelength
stars
wavelengths
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bongiorno, S. D., Falcone, A. D., Stroh, M., Holder, J., Skilton, J. L., Hinton, J. A., ... Grube, J. (2011). A new TeV binary: The discovery of an orbital period in HESS J0632+057. Astrophysical Journal Letters, 737(1), [L11]. https://doi.org/10.1088/2041-8205/737/1/L11
Bongiorno, S. D. ; Falcone, Abraham David ; 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. In: Astrophysical Journal Letters. 2011 ; Vol. 737, No. 1.
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Bongiorno, SD, Falcone, AD, Stroh, M, Holder, J, Skilton, JL, Hinton, JA, Gehrels, N & Grube, J 2011, 'A new TeV binary: The discovery of an orbital period in HESS J0632+057', Astrophysical Journal Letters, vol. 737, no. 1, L11. https://doi.org/10.1088/2041-8205/737/1/L11

A new TeV binary : The discovery of an orbital period in HESS J0632+057. / Bongiorno, S. D.; Falcone, Abraham David; Stroh, M.; Holder, J.; Skilton, J. L.; Hinton, J. A.; Gehrels, N.; Grube, J.

In: Astrophysical Journal Letters, Vol. 737, No. 1, L11, 10.08.2011.

Research output: Contribution to journalArticle

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