Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010scchg..53..102l&link_type=abstract
Science China Physics, Mechanics and Astronomy, Volume 53, Issue 1, pp.102-105
Astronomy and Astrophysics
Astronomy
Accretion: Accretion Disks, Ultraviolet: Galaxies, X-Rays: Galaxies
Scientific paper
To study the origin of the soft X-ray excess, we compile a sample of 94 unobscured, radio-quiet QSOs and Seyfert galaxies with available data from GALEX and ROSAT. We find that 50 sources show strong soft X-ray excess and the other 44 show weak/no soft X-ray excess. Systematic analyses of the data indicate that the difference in soft X-rays is mainly but not only resulting from different accretion rates (in units of Eddington rate). The statistical study of the sources with soft X-ray excess shows that the strength of soft X-ray excess weakly and positively correlates with the Eddington ratio and increases with the increase of the strength of UV radiations relative to the X-rays. Provided that the UV emissions are from the thin disk, the correlations imply that the origin of soft X-ray excess is associated with the thin disk, either by means of Comptonization of the disk photons or in some other ways.
Liu Jieying
Qiao Erlin
No associations
LandOfFree
A statistical study of the relation between soft X-ray excess and accretion disk does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A statistical study of the relation between soft X-ray excess and accretion disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A statistical study of the relation between soft X-ray excess and accretion disk will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-804468