LUMINOSITY FUNCTIONS AND POINT-SOURCE PROPERTIES FROM MULTIPLE CHANDRA OBSERVATIONS OF M81
Name
Sell-2011-LUMINOSITY FUNCTIONS.pdf
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1.63 MB
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Author(s)
Sell, P. H.
Pooley, D.
Zezas, A.
Heinz, Sebastian
Homan, Jeroen
Lewin, Walter H. G.
Date Issued
June 2011
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Sell, P. H., D. Pooley, A. Zezas, S. Heinz, J. Homan, and W. H. G. Lewin. “ LUMINOSITY FUNCTIONS AND POINT-SOURCE PROPERTIES FROM MULTIPLE CHANDRA OBSERVATIONS OF M81 .” The Astrophysical Journal 735, no. 1 (June 10, 2011): 26. © 2011 The American Astronomical Society
Version
Final published version
Abstract
We present an analysis of 15 Chandra observations of the nearby spiral galaxy M81 taken over the course of six weeks in 2005 May-July. Each observation reaches a sensitivity of ~10[superscript 37] erg s[superscript –1]. With these observations and one previous deeper Chandra observation, we compile a master source list of 265 point sources, extract and fit their spectra, and differentiate basic populations of sources through their colors. We also carry out variability analyses of individual point sources and of X-ray luminosity functions (XLFs) in multiple regions of M81 on timescales of days, months, and years. We find that, despite measuring significant variability in a considerable fraction of sources, snapshot observations provide a consistent determination of the XLF of M81. We also fit the XLFs for multiple regions of M81 and, using common parameterizations, compare these luminosity functions to those of two other spiral galaxies, M31 and the Milky Way.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1088/0004-637x/735/1/26
