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Title:
AXJ1749+684: a narrow-emission-line galaxy with a flat X-ray spectrum
Authors:
Iwasawa, K.; Fabian, A. C.; Brandt, W. N.; Crawford, C. S.; Almaini, O.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA), AD(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AE(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 291, Issue 1, pp. L17-L22. (MNRAS Homepage)
Publication Date:
10/1997
Origin:
MNRAS
MNRAS Keywords:
GALAXIES: ACTIVE, GALAXIES: INDIVIDUAL: AXJ1749+684, X-RAYS: GALAXIES
Bibliographic Code:
1997MNRAS.291L..17I

Abstract

We report the serendipitous detection of an X-ray source, AXJ1749+684, with the ASCA Gas Imaging Spectrometer. AXJ1749+684 is identified with a LINER/starburst-type spiral galaxy KUG1750+683A at a redshift z=0.05. It has a hard X-ray spectrum, consistent with that of the X-ray background (XRB) in the 1-10 keV band. Despite the optical classification, the X-ray luminosity cannot be explained by starburst activity. Combined with spatial variations in the optical emission-line ratios, this suggests the presence of an obscured Seyfert nucleus embedded within a star-forming galaxy. Similar behaviour could explain the ambiguous properties of the faint narrow-line X-ray galaxies (NLXGs) emerging from deep X-ray surveys.

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