Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 391, Issue 1, Pages L108-L112Publisher
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1745-3933.2008.00566.x
Keywords
binaries: eclipsing; stars: individual: IGRJ16479-4514; stars: neutron; X-rays: binaries; X-rays: stars
Categories
Funding
- ASI
- MIUR
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Supergiant fast X-ray transients (SFXTs) are a new class of high-mass X-ray binaries recently discovered with INTEGRAL. Hours-long outbursts from these sources have been observed on numerous occasions at luminosities of similar to 10(36)-10(37) erg s(-1), whereas their low-level activity at similar to 10(32)-10(34) erg s(-1) has not been deeply investigated yet due to the paucity of long pointed observations with high-sensitivity X-ray telescopes. Here, we report on the first long (similar to 32 ks) pointed XMM-Newton observation of IGRJ16479-4514, a member of this new class. This observation was carried out in 2008 March, shortly after an outburst from this source, with the main goal of investigating its low-level emission and physical mechanisms that drive the source activity. Results from the timing, spectral and spatial analysis of the EPIC-PN XMM-Newton observation show that the X-ray source IGR J16479-4514 underwent an episode of sudden obscuration, possibly an X-ray eclipse by the supergiant companion. We also found evidence for a soft X-ray extended halo around the source that is most readily interpreted as due to scattering by dust along the line of sight to IGR J16479-4514. We discuss this result in the context of the gated accretion scenarios that have been proposed to interpret the behaviour of SFXT.
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