2003A&A...400..145P


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET02:20:44

2003A&A...400..145P - Astronomy and Astrophysics, volume 400, 145-151 (2003/3-2)

X-ray emission line gas in the LINER galaxy M 81.

PAGE M.J., BREEVELD A.A., SORIA R., WU K., BRANDUARDI-RAYMONT G., MASON K.O., STARLING R.L.C. and ZANE S.

Abstract (from CDS):

We present the soft X-ray spectrum of the LINER galaxy M 81 derived from a long observation with the XMM-Newton RGS. The spectrum is dominated by continuum emission from the active nucleus, but also contains emission lines from Fe L, and H-like and He-like N, O, and Ne. The emission lines are significantly broader than the RGS point-source spectral resolution; in the cross dispersion direction the emission lines are detected adjacent to, as well as coincident with, the active nucleus. This implies that they originate in a region of a few arcminutes spatial extent (1arcmin∼1kpc in M 81). The flux ratios of the O VII triplet suggest that collisional processes are responsible for the line emission. A good fit to the whole RGS spectrum is obtained using a model consisting of an absorbed power law from the active nucleus and a 3 temperature optically thin thermal plasma. Two of the thermal plasma components have temperatures of 0.18±0.04keV and 0.64±0.04keV, characteristic of the hot interstellar medium produced by supernovae; the combined luminosity of the plasma at these two temperatures accounts for all the unresolved bulge X-ray emission seen in the Chandra observation by Tennant et al. (2001ApJ...549L..43T). The third component has a higher temperature (1.7+2.1–0.5keV), and we argue that this, along with some of the 0.64keV emission, comes from X-ray binaries in the bulge of M 81.

Abstract Copyright:

Journal keyword(s): X-rays: galaxies - ISM: supernova remnants - galaxies: individual: M 81 - galaxies: active

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4030 5
2 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2418 1

    Equat.    Gal    SGal    Ecl

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2021.01.24-02:20:44

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