NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T23:28:53 PDT
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For refcode 1999A&A...349...88K:
Retrieve 13 NED objects in this reference.
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1999A&A...349...88K X-ray properties of LINERs. KOMOSSA S., BOEHRINGER H., HUCHRA J.P. Received 6 April 1999/Accepted 17 June 1999 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}_x_= ~-2.0 or thermal emission from gas with very subsolar abundances. The luminosities range between logL_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. Keywords: galaxies: active - galaxies: fundamental parameters - galaxies: ISM - galaxies: nuclei - X-rays: galaxies
Retrieve 13 NED objects in this reference.
Please click here for ADS abstract

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