X-ray emission mechanisms of LINERs

Details X-ray emission mechanisms of LINERs X-ray emission mechanisms of LINERs

1999-07-07

arxiv.org/abs/astro-ph/9907092v1

Astrophys.Space Sci. 272 (2000) 295-298

Astronomy and Astrophysics

Astrophysics

4 pages incl. 2 figures (needs crckapb.sty); contribution to the proc. of `Astrophysical Dynamics' (Evora, April 14-16, 1999),

Scientific paper

10.1023/A:1002617101356

We present here an analysis of the X-ray properties of a sample of LINER galaxies observed with the ROSAT PSPC and HRI instruments. A spatial analysis shows that the bulk of the X-ray emission is consistent with arising from a point source; some extended emission appears at weak emission levels. The X-ray spectra are formally best described by a powerlaw with photon index Gamma_x ~ -2 or thermal emission from a Raymond-Smith plasma with highly subsolar abundances (Z < 0.1). Several emission mechanisms that might contribute to the observed X-ray spectra are discussed. In particular, we take the very subsolar abundances derived from Raymond-Smith fits as an indication of a more complex emission mechanism, like the presence of a second hard component or plasma out of collisional-ionization equilibrium.

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