XMM-NEWTON OBSERVATIONS OF LUMINOUS SOURCES IN NEARBY GALAXIES NGC 4395, NGC 4736, AND NGC 4258

We present the results of a study of non-nuclear discrete sources in a sample of three nearby spiral galaxies (NGC 4395, NGC 4736, and NGC 4258) based on XMM-Newton archival data supplemented with Chandra data for spectral and timing analyses. A total of 75 X-ray sources have been detected within th...

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Bibliographic Details
Published in:The Astronomical journal 2013-03, Vol.145 (3), p.1-19
Main Authors: Akyuz, A, KAYACI, S, Avdan, H, Ozel, M E, SONBAS, E, Balman, S
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Binary stars
GALAXIES
NUCLEI
POINT SOURCES
Pollution sources
Spectra
SPIRAL CONFIGURATION
SUPERNOVA REMNANTS
Time measurements
TRANSIENTS
X RADIATION
X-RAY GALAXIES
X-RAY SOURCES
X-ray stars
XMM (spacecraft)
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Summary:We present the results of a study of non-nuclear discrete sources in a sample of three nearby spiral galaxies (NGC 4395, NGC 4736, and NGC 4258) based on XMM-Newton archival data supplemented with Chandra data for spectral and timing analyses. A total of 75 X-ray sources have been detected within the D sub(25) regions of the target galaxies. The large collecting area of XMM-Newton makes the statistics sufficient to obtain spectral fitting for 16 (about 20%) of these sources. Compiling the extensive archival exposures available, we were able to obtain the detailed spectral shapes of diverse classes of point sources. We have also studied temporal properties of these luminous sources. Eleven of them are found to show short-term (less than 80 ks) variation while eight of them show long-term variation within factors of ~2-5 during a time interval of ~2-12 years. Timing analysis provides strong evidence that most of these sources are accreting X-ray binary systems. One source that has properties different from others was suspected to be a supernova remnant, and our follow-up optical observation confirmed this. Our results indicate that sources within the three nearby galaxies are showing a variety of source populations, including several ultraluminous X-ray sources, X-ray binaries, transients together with a super soft source, and a background active galactic nucleus candidate.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.1088/0004-6256/145/3/67