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For refcode 1999ApJ...520..130W:
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1999ApJ...520..130W X-Ray Emission from the Prototypical LINER Galaxy NGC 1052 K. A. WEAVER Code 662, NASA Goddard Space Flight Center, Greenbelt, MD 20771; kweaver@milkyway.gsfc.nasa.gov A. S. WILSON Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 C. HENKEL Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, D-53121 Bonn, Germany; p220hen@mpifr-bonn.mpg.de AND J. A. BRAATZ National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944; jbraatz@nrao.edu Received 1998 August 25; accepted 1999 February 27 ABSTRACT We examine the 0.1-10.0 keV X-ray spectrum of the bright nuclear LINER galaxy NGC 1052, one of two elliptical galaxies known to contain a luminous H_2_O maser. The observed 2.0-10.0 keV spectrum is unusually flat (photon index {GAMMA}~0.2) and is best described as intrinsically power-law shaped nuclear flux that is either (1) attenuated by a complex absorber with ~70% of the nuclear flux absorbed by a column density of N_H_ ~ 3 x 10^23^ cm^- 2^ and ~30% absorbed by a column density of N_H_ ~ 3-5 x 10^22^ cm^-2^ or (2) reprocessed, with the nuclear source blocked and the X-rays Compton reflected in our direction by high column density (>=10^24^ cm^-2^) gas. The moderate equivalent width of the Fe K{alpha} line favors the dual absorption model as the most likely scenario. The 0.1-2.0 keV spectrum does not resemble the few times 10^6^-10^7^ K thermal emission typically found in other elliptical galaxies, but instead is best described as nuclear X- rays leaking through a patchy absorber or scattered in our direction by low-density, ionized gas plus a 15%-20% contribution from a thermal component, which is most likely due to the galaxy. The absorption-corrected 2-10 keV luminosity of the nuclear source is L_X_ ~ 8 x 10^41^ ergs s^-1^ or L_X_ ~ 2 x 10^43^ ergs s^-1^ for the dual-absorption and Compton- reflection models, respectively. The absorbing and H_2_O masing gases appear to be spatially separate in this galaxy. Subject headings: galaxies: individual (NGC 1052)-galaxies: nuclei - galaxies: Seyfert-masers-X-rays: galaxies
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