Ultraviolet extensions measured with ROSAT HRI around active galaxies

Details Ultraviolet extensions measured with ROSAT HRI around active galaxies Ultraviolet extensions measured with ROSAT HRI around active galaxies

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294l..45a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 294, no. 3, p. L45-L48

Astronomy and Astrophysics

Astronomy

4

High Resolution, Seyfert Galaxies, Ultraviolet Astronomy, Ultraviolet Radiation, Rosat Mission, X Rays

Scientific paper

Extended emissions around two active galaxies have been detected with the High Resolution Images (HRI) of ROSAT in locations where there is no emission present in more sensitive Position Sensitive Proportional Counter (PSPC) images. The extended emission in HRI is only present in PHA channels 1 through 3 which implies that it is ultraviolet radiation of predominantly wavelengths 1500 to 1700 A. The ultraviolet emission is registered with count rates from 0.7 cts/ks for faint filaments, to 2.5 cts/ks in associated condensations and bright spots. It would seem necessary to check all HRI observations in order to guard against interpreting signal from this ultraviolet leak as X-rays in the expected 0.1 to 2.4 keV band.

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