aa9027-07.pdf (282.04 kB)
XMMU J134736.6+173403: An eclipsing LMXB in quiescence or a peculiar AGN?
journal contribution
posted on 2012-10-24, 09:22 authored by S. Carpano, A. Nucita, B. Altieri, A. R. King, P. LeisyAims.We report the discovery of a peculiar object observed serendipitously with XMM-Newton. We present its timing and spectral properties and investigate its optical counterpart.
Methods.The light curve of the X-ray source, its spectrum, and the spectrum of the best optical counterpart are presented and analyzed.
Results.The X-ray flux decreases by a factor of 6.5 within 1 h and stays in a low state for at least 10 h, thereby suggesting the presence of an eclipse. The spectrum is very soft, a power law with a slope of $\Gamma\sim2.8$, and does not change significantly before and after the flux drop. The source is spatially coincident within few arc-seconds with a Seyfert 2 galaxy belonging to a galaxy pair.
Conclusions.Although the background AGN seems the best counterpart, neither the temporal nor the spectral properties of the X-ray source are compatible with it. We investigate the possibility of having a foreground low-mass X-ray binary in quiescence, where the companion is not detected in the optical wavelength.
History
Citation
Astronomy & Astrophysics, 2008, 480 (3), pp. 807-810Version
- VoR (Version of Record)
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Astronomy & AstrophysicsPublisher
EDP Sciences for European Southern Observatory (ESO)issn
0004-6361eissn
1432-0746Copyright date
2008Available date
2012-10-24Publisher DOI
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http://www.aanda.org/articles/aa/abs/2008/12/aa9027-07/aa9027-07.htmlLanguage
enAdministrator link
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