NDLI: Spectral monitoring of ngc 1365: nucleus and variable ulx

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Spectral monitoring of ngc 1365: nucleus and variable ulx

Content Provider	NASA Technical Reports Server (NTRS)
Author	Mushotzky, Richard Technical Monitor Fabbiano, G.
Copyright Year	2004
Description	A letter has been submitted to ApJ, and is in the final stages of revision on the spectral variability of the nuclear source. We presented multiple Chandra and XMM-Newton observations of the Seyfert Galaxy NGC 1365, which shows the most dramatic X-ray spectral changes observed so far in an AGN: the source switched from reflection dominated to Compton- thin and back in just 6 weeks. During this time the soft thermal component, arising from a 1-kpc region around the center, remained constant. The reflection component is constant at all timescales, and its flux is a fraction of 5% or higher of the direct 2-10 keV emission, implying the presence of thick gas covering a big fraction of the solid angle. The presence of this gas, and the hst variability time scale, suggest that the Compton-thick to Compton thin change is due to variation in the line-of-sight absorber, rather than to extreme intrinsic emission variability. We discuss a structure of the circumnuclear absorbed reflector which can explain the observed X-ray spectral and temporal properties. But these important results come only from scratching the surface of the data, since we did not need any detailed spectral analysis to distinguish between the Compton thick and Compton thin states of the source, the difference in both spectral shape and flux being huge.
File Size	144646
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20050009885
Archival Resource Key	ark:/13960/t4jm7749r
Language	English
Publisher Date	2004-12-01
Access Restriction	Open
Subject Keyword	Astrophysics Seyfert Galaxies Reflectors X Rays Variability Spectrum Analysis Monitors Spectra Line of Sight Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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