Study of X-ray Spectral Parameters from Large Sample of RXTE Active Galaxies

Details Study of X-ray Spectral Parameters from Large Sample of RXTE Active Galaxies Study of X-ray Spectral Parameters from Large Sample of RXTE Active Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7220m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #72.20; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We report preliminary results of an on-going systematic X-ray spectral variability study of bright Seyfert galaxies observed by the Rossi X-Ray Timing Explorer (RXTE). The RXTE public archive contains data for 40 Seyfert galaxies with suitable temporal coverage to perform variability studies covering short (days/weeks) to long (years) timescales. We have developed a data pipeline to automate the data reduction. The pipeline produces a series of spectra for each source divided temporally in such a way that each has at least 125,000 net photons to ensure a good spectral fit. To fit the spectra, we have assumed an intrinsic powerlaw X-ray spectrum produced close to the central black hole that is reprocessed and absorbed by material around the black hole. We fit each X-ray spectrum with a model of this reflected emission, including fluorescent Fe K$\alpha$ emission, Compton reflection component and absorption. We have also performed Monte Carlo simulations of the spectral sample and fitted them to the same model to test the robustness of our results. The goal of this research is first to build a database of spectral parameters for a large sample of AGN, and then to seek correlations between spectral parameters and determine which correlations are specific to various classes of AGN (e.g. Seyfert type or radio-loudness). The results will constrain the geometry of the nuclear region, providing tests for current reflection and unification models of AGN. Our current results show a complex relationship between the photon index and iron line equivalent width. In addition, our Monte Carlo results confirm the strength of the systematic correlation between the photon index and reflection fraction.

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