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Physical Sciences and Mathematics Commons™
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Astronomy Department Faculty Publication Series
Galaxies: individual (M81); galaxies: general; galaxies: spiral; X-rays: galaxies; X-rays: general; X-rays: ISM
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Rosat X-Ray Observations Of The Spiral Galaxy M81, S Immler, Qd Wang
Rosat X-Ray Observations Of The Spiral Galaxy M81, S Immler, Qd Wang
Astronomy Department Faculty Publication Series
We present results from the analysis of deep ROSAT HRI and PSPC observations of the spiral galaxy M81. The inferred total (0.5-2 keV band) luminosity of M81 is ~3 × 1040 ergs s-1, excluding the contribution from identified interlopers found within the D25 ellipse. The nucleus of the galaxy alone accounts for about 65% of this luminosity. The rest is due to 26 other X-ray sources (contributing ~10%) and to apparently diffuse emission, which is seen across much of the galactic disk and is particularly bright in the bulge region around the nucleus. Spectral analysis further …