Discovery of Extreme-Ultraviolet Radiation from the Seyfert Galaxy Ton S180 (= EUVE J0057-223)

Details Discovery of Extreme-Ultraviolet Radiation from the Seyfert Galaxy Ton S180 (= EUVE J0057-223) Discovery of Extreme-Ultraviolet Radiation from the Seyfert Galaxy Ton S180 (= EUVE J0057-223)

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448l...9v&link_type=abstract

Astrophysical Journal Letters v.448, p.L9

Astronomy and Astrophysics

Astronomy

11

Galaxies: Seyfert, Galaxies: Nuclei, X-Rays: Galaxies, Ultraviolet: Galaxies

Scientific paper

We report the detection of intense EUV radiation from the Seyfert 1 galaxy Ton S180. The source EUVE J0057-223, discovered in the Extreme-Ultraviolet Explorer all-sky survey, is only 25" away from its optical counterpart, well within the position error circle. We present a complete broadband energy distribution of Ton S180 using infrared (IRAS), optical, ultraviolet (IUE) and X-ray (ROSAT) flux measurements, and we find that the measured EUV flux, corrected for neutral hydrogen and helium absorption in the Galaxy, suggests the presence of a strong EUV to soft X-ray flux excess. We briefly discuss the implications for models of active galaxies.

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