Physics – High Energy Physics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1206..328c&link_type=abstract
ASTROPHYSICS AND COSMOLOGY AFTER GAMOW: Proceedings of the 4th Gamow International Conference on Astrophysics and Cosmology Afte
Physics
High Energy Physics
Galactic Nuclei, Photometry, Clusters Of Galaxies, X-Ray Sources (Astronomical), Galactic Nuclei, Circumnuclear Matter, And Bulges, Photography And Photometry, Small And Compact Galaxy Groups, X-Ray Sources, X-Ray Bursts
Scientific paper
We present the results of a study on the optical and X-ray variability properties of eight Seyfert galaxies NGC 5548, NGC 7469, NGC 4051, NGC 4151, NGC 3227, Ark 564, Mrk 509, Mrk 79. Two objects, NGC 5548 and NGC 4051, show the highest probability for the positive lag (i.e., optical variations lag behind the X-ray) at about 97% confidence level. The lag is found to be 2.8-1.0+3.7 days for NGC 5548 and 2.1-0.4+3.9 days for NGC 4051 that testifies in favor of the re-radiation mechanism by Compton upscattering. Two objects, NGC 5548 and NGC 7469, show the highest degree of correlation between optical and X-ray fluxes, though this correlation is lower for other objects, and completely absent for Ark 564. The width of the auto-correlation function and the slope of the structure function are greater for the optic light curves than for X-ray light curves. It means the rapid flux variations are manifested better in the X-rays, while the long-term variations are manifested better in optical bands.
We discuss also the first results of studying the kinematic and photometric properties of AGNs selected from the new 2 MIG (2-Micron Isolated Galaxies) catalogue for estimating environmental influence in case of AGNs with companions.
Chesnok N.
Sergeev Sergei
Vavilova I.
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