Chandra Observation of the Big Dipper X 1624-490

Details Chandra Observation of the Big Dipper X 1624-490 Chandra Observation of the Big Dipper X 1624-490

2006-12-11

arxiv.org/abs/astro-ph/0612269v2

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, accepted by A&A on 13/11/2006. Revised version with minor points corrected and reference added to the used

Scientific paper

10.1051/0004-6361:20065862

We present the results of a 73 ks long Chandra observation of the dipping source X 1624-490. During the observation a complex dip lasting 4 hours is observed. We analyse the persistent emission detecting, for the first time in the 1st-order spectra of X 1624-490, an absorption line associated to \ion{Ca}{xx}. We confirm the presence of the \ion{Fe}{xxv} K$_\alpha$ and \ion{Fe}{xxvi} K$_\alpha$ absorption lines with a larger accuracy with respect to a previous XMM observation. Assuming that the line widths are due to a bulk motion or a turbulence associated to the coronal activity, we estimate that the lines have been produced in a photoionized absorber between the coronal radius and the outer edge of the accretion disk.

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