Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.230..207b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 230, Jan. 15, 1988, p. 207-213. SERC-supported research
Astronomy and Astrophysics
Astronomy
4
Active Galactic Nuclei, Seyfert Galaxies, Variability, X Ray Sources, Degenerate Matter, Exosat Satellite, Galactic Radiation, Infrared Photometry, Light Curve
Scientific paper
A serendipitous X-ray source, discovered by EXOSAT in the field of the hot, helium-rich degenerate star PG1159-035, has been identified with the 15.1-mag galaxy ZWG 013.024. The object is classified as Seyfert 1 and has a redshift of 0.019, implying a distance of 117 Mpc. ZWG 013.024 has an unusually soft-medium-energy (0.5-6keV) X-ray spectrum (photon index 2.1) and is variable on a time-scale of 7-14 hr. Variations in the low-energy telescope (thin lexan filter) and medium-energy array count rates are correlated and have similar amplitudes, a factor of 3. The softness ratio is constant throughout the observation indicating that there is no associated spectral variability. This object appears to be a further addition to the small group of rapidly variable AGNs.
Barstow Martin Adrian
Stanger V. J.
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