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X-ray properties of LINERs | | Stefanie Komossa
; Hans Boehringer
; John P. Huchra
; | | Date: |
9 Jul 1999 | | Subject: | astro-ph | | Affiliation: | MPE Garching), Hans Boehringer (MPE Garching), John P. Huchra (Harvard-Smithsonian Center for Astrophysics | | Abstract: | We present an investigation of the X-ray properties of 13 LINERs based on ROSAT all-sky survey and pointed PSPC and HRI observations. Several sources are studied for the first time in X-rays. The X-ray spectra are best described by a powerlaw with photon index Gamma ~ -2.0 or thermal emission from gas with very subsolar abundances. The luminosities range between log L_x = 37.7 (NGC 404) and 40.8 (NGC 4450). No X-ray variability on the timescale of hours/days is detected. This is in line with the suggestion that LINERs may accrete in the advection-dominated mode. On a longer term, one of the objects, NGC 2768, turns out to be slightly variable. Some sources appear to be extended at weak emission levels whereas the bulk of the X-ray emission is consistent with arising from a point source within the PSPC instrumental resolution. L_x/L_B ratios are derived and emission mechanisms that potentially contribute to the observed X-ray luminosities are discussed. We also examine the presence of second X-ray sources near the target sources both in terms of instrumental effects and in terms of `real’ sources within the LINER galaxies. | | Source: | arXiv, astro-ph/9907119 | | Services: | Forum | Review | PDF | Favorites | |
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