Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...588..264k&link_type=abstract
The Astrophysical Journal, Volume 588, Issue 1, pp. 264-280.
Astronomy and Astrophysics
Astronomy
21
Galaxies: Halos, Galaxies: Individual: Messier Number: M101, Galaxies: Individual: Ngc Number: Ngc 5457, Galaxies: Ism, X-Rays: Diffuse Background, X-Rays: Galaxies, X-Rays: Ism
Scientific paper
The total 0.45-1.0 keV luminosity of M101 is 3.2×1039 ergs s-1, of which 2.3×1039 ergs s-1 is due to diffuse emission. (Chandra observes only ~60% of the diffuse emission observed by ROSAT because of its superior point-source detection.) Of the diffuse emission seen by Chandra, no more than 6% can be due to luminous unresolved point sources, such as X-ray binaries, and ~10% is likely due to dwarf stars. The diffuse emission traces the spiral arms and is roughly correlated with the Hα and far-UV emission. The radial distribution closely follows the optical profile. The bulk of the diffuse emission is characterized by a two-thermal component spectrum with kT=0.20 and 0.75 keV, and the ratio of the emission measures of the two components is roughly constant as a function of both radius and surface brightness. The softer component has a sufficiently large covering factor that the bulk of the emission is likely extraplanar. We find no evidence of an extended axisymmetric X-ray halo, suggesting that any such halo has a strength much smaller than current predictions.
Kuntz Kip D.
Mukai Kazuhiko
Pence William D.
Snowden Steve L.
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