The properties of the absorbing and line emitting material in IGR J16318-4848

Details The properties of the absorbing and line emitting material in IGR J16318-4848 The properties of the absorbing and line emitting material in IGR J16318-4848

2003-03-28

arxiv.org/abs/astro-ph/0303626v1

Mon.Not.Roy.Astron.Soc. 341 (2003) L13

Astronomy and Astrophysics

Astrophysics

accepted for publication in MNRAS, pink pages

Scientific paper

10.1046/j.1365-8711.2003.06658.x

We have performed a detailed analysis of the XMM-Newton observation of IGR J16318-4848, to study the properties of the matter responsible for the obscuration and for the emission of Fe and Ni lines. Even if the line of sight material has a column density of about 2x10^24 cm^-2, from the Fe Kalpha line EW and Compton Shoulder we argue that the matter should have an average column density of a few x10^23 cm^-2, along with a covering factor of about 0.1-0.2. The iron Kalpha line varies on time scales as short as 1000 s, implying a size of the emitting region smaller than about 3x10^13 cm. The flux of the line roughly follows the variations of the continuum, but not exactly, suggesting a variation of the geometrical properties of the emitting region on similar time scales.

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