Mathematics – Probability
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010fym..confp..50k&link_type=abstract
"The First Year of MAXI: Monitoring Variable X-ray Sources", Poster Presentations, 4th International MAXI Workshop held November
Mathematics
Probability
Scientific paper
X-ray variability is a well-known property of active galactic nuclei (AGNs). Variability on short timescales implies the presence of a relatively low-mass supermassive black hole, which is of great interest to understand evolution of AGNs and physics of growth of black holes. We made our sample consisting of objects showing strong variability from the Second XMM-Newton Serendipitous Source Catalogue (DR3) to search for such a class of objects. We required sources to satisfy the following conditions: (1) the probability that the source is constant < 10^-5 , (2) the count rate for EPIC-pn in 0.2-12 keV >= 0.1 cts/s and (3) Galactic latitude |b| >= 10 deg. 718 sources fulfilled these criteria, and 53 among them were selected as AGNs based on X-ray and optical properties. Four of these were not recognized as AGN in the past and detailed analysis of these four was performed. Their lightcurves show intensity changes by a factor of two or more on timescales of several thousand seconds. The high energy part of their X-ray spectra were fitted by a power-law model with a photon index 1.8-1.9 for two objects and 2.3-2.6 for the others, which are the ranges for broad-line and narrow-line Seyfert 1s, respectively. Soft X-ray excess was seen in three of these objects, and expressed by a blackbody with kT ˜ 0.10-0.17 keV.
Awaki Hisamitsu
Kamizasa N.
Terashima Yoshinosuke
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