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Limits on Hot Galactic Halo Gas from X-Ray Absorption Lines
4U 1957+11 Mrk 421 LMC X–3
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2014/12/23
Although the existence of large-scale hot gaseous halos around massive disk galaxies has been theorized for a long time, there is yet very little observational evidence. We report the Chandra and XMM-...
Variability of Extragalactic Objects in Relation to Redshift, Color, Radio Spectral Index and Absorption Lines
Galaxies active galaxies quasars
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2009/5/20
Optical variability of extragalactic objects, viz., QSOs, BL Lacs and Seyfert galaxies has been monitored systematically over an appreciable period of time and a large amount of data have accumulated....
ON DETERMINATION OF THE COSMIC RAY FLUX USING MOLECULAR HYDROGEN ABSORPTION LINES
Molecular processes-SM molecules-quasars absorption lines
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2009/3/11
We outline a procedure for estimating the cosmic ray flux at remote
locations where molecular hydrogen absorption lines have been detected. The
method relies on several assumptions whose validity in...