Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291l..49e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 291, p. L49-L52
Astronomy and Astrophysics
Astronomy
3
Quasars, Active Galactic Nuclei, Interstellar Matter, X Ray Sources, Absorption Spectra, X Ray Spectra, H I Regions, High Speed
Scientific paper
PHL 6625, a z = 0.38, radio-quiet quasar, shows a clear excess of low-energy absorption in its ROSAT PSPC soft X-ray spectrum. This absorption is almost certainly produced by the ISM in NGC 247, a foreground spiral galaxy, which lies about 3.4 kpc (4.6 arcmin) away in projection. Comparison of the X-ray absorption and the 21-cm H I column density through NGC 247 suggests a larger than expected effect in X-rays. Several possibilities are considered to explain this apparent discrepancy. Additional high-velocity H I components of the ISM are currently the most plausible cause. PHL 6625 also clearly decreased in its soft X-ray flux by a factor of two in six months.
Elvis Martin
Fiore Fabrizio
Giommi Paolo
Padovani Paolo
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