1999ApJ...511..142T -
Astrophys. J., 511, 142-148 (1999/January-3)
X-ray observations of Markarian 231.
TURNER T.J.
Abstract (from CDS):
This paper presents new X-ray observations of Mrk 231, an active galaxy of particular interest because of its large infrared luminosity and the presence of several blueshifted broad absorption line (BAL) systems, a phenomenon observed in a small fraction of QSOs. A ROSAT HRI image of Mrk 231 is presented, which shows an extended region of soft X-ray emission covering several tens of kiloparsecs, consistent with the extent of the host galaxy. An ASCA observation of Mrk 231 is also presented. Hard X-rays are detected, but the data show no significant variability in X-ray flux. The hard X-ray continuum is heavily attenuated, and X-ray column estimates range from ∼2x1022 to 1023 cm–2, depending on whether the material is assumed to be neutral or ionized, and depending on the model assumed for the extended X-ray component. These ASCA data provide only the second hard X-ray spectrum of a BAL active galactic nucleus presented to date. The broadband spectral energy distribution of the source is discussed. While Mrk 231 is X-ray weak compared to Seyfert 1 galaxies, it has an optical-to-X-ray spectrum typical of a QSO.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Active - Galaxies: Individual: Name: Markarian 231 - Galaxies: Nuclei - X-Rays: Galaxies
Simbad objects:
4
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