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Title:
The origin of the soft X-ray excess in the Seyfert 2 galaxy NGC 2110
Authors:
Weaver, K. A.; Mushotzky, R. F.; Serlemitsos, P. J.; Wilson, A. S.; Elvis, M.; Briel, U.
Affiliation:
AA(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AB(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AC(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AD(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US)
Publication:
Astrophysical Journal (ISSN 0004-637X), vol. 442, no. 2, Part 1, p. 597-609 (ApJ Homepage)
Publication Date:
04/1995
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Galactic Nuclei, Interstellar Gas, Seyfert Galaxies, X Ray Astronomy, X Ray Imagery, X Ray Spectra, Astronomical Spectroscopy, Image Analysis, Radiation Sources, Rosat Mission, Shock Heating, Spaceborne Astronomy, Spectrum Analysis
DOI:
10.1086/175463
Bibliographic Code:
1995ApJ...442..597W

Abstract

We present and discuss an X-ray image and a medium-resolution X-ray spectrum of the Seyfert 2 galaxy NGC 2110 obtained with the high-resolution imager (HRI) on ROSAT (0.1-2.4 keV) and Goddard's Broad Band X-ray Telescope (BBXRT; 0.3-11 keV), respectively. Spatially resolved soft X-ray emission, which peaks 4 arcsecs to the north of the nucleus and near the position of the highest excitation optical emission line gas is seen in the HRI observation. The extent has a flux of approximately 3 x 10-13 ergs/sq cm/s and accounts for 11% +/- 3% of the total 0.1-2.4 keV flux. To model the BBXRT spectrum, a soft excess component is required which has a flux of approximately 3.5 x 10-13 ergs/sq cm/s and accounts for approximately 14% +/- 6% of the total 0.1-2.4 keV flux. In addition, BBXRT confirms the presence of an approximately 175 eV equivalent width Fe K alpha flourescence line in NGC 2110. Because of the good agreement between their fluxes, we propose that the soft excess in NGC 2110 is due to leakage of the X-ray continuum through a patchy absorber. The temperature of the gas responsible for the soft excess is too high to be accounted for by local shock heating. In order to explain the soft excess and extent as either scattered continuum X-rays or flourescence from gas photoionized by the nuclear source, the hard X-rays must be emitted anisotropically. However, the soft excess and extent can be well modeled as thermal emission from a hot, outflowing wind, which may also be responsible for confirming at least some portion of the optical narrow line-emitting clouds.

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