Gamma-ray/x-ray Observations Of The Be-pulsar Binary 1a0535+262 During A Major Outburst

Details Gamma-ray/x-ray Observations Of The Be-pulsar Binary 1a0535+262 During A Major Outburst Gamma-ray/x-ray Observations Of The Be-pulsar Binary 1a0535+262 During A Major Outburst

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714429v&link_type=abstract

American Astronomical Society, AAS Meeting #217, #144.29; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The detection of Cyg X-1, PSR B1259-63, LS 5039 and LS I +61 303 at TeV energies have established X-ray binaries as a new class of VHE gamma-ray emitters. In this work, we report results from gamma-ray and X-ray observations of 1A035+262 during a major outburst in December 2009. The TeV gamma-ray data were obtained with VERITAS (0.1-30 TeV). We also used public Fermi/LAT data to cover the GeV band (0.1-300 GeV). The X-ray data were obtained with the RXTE/PCA (2-60 keV) and Swift/XRT (0.3-10 keV). The observations provided a good coverage of the X-ray outburst, as well as the binary orbit. 1A0535+262 was not detected at TeV or GeV energies. This is consistent with the fact that the observed X-ray continuum can be described as the combination of blackbody and Comptonized emission from thermal electrons (presumably in the accretion disk and "corona") and that the source radiates little at radio wavelengths. The lack of non-thermal electrons distinguishes the source from those Be X-ray binaries (such as PSR B1259-63 and LS I +61 303) that have been detected at GeV-TeV energies. We discuss the implications of the results on theoretical models.

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