Simultaneous Far-UV and X-ray Observations of NGC 3516 with HUT and ASCA

Details Simultaneous Far-UV and X-ray Observations of NGC 3516 with HUT and ASCA Simultaneous Far-UV and X-ray Observations of NGC 3516 with HUT and ASCA

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.5010k&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #50.10; Bulletin of the American Astronomical Society, Vol. 27, p.1359

Astronomy and Astrophysics

Astronomy

Scientific paper

We observed the Seyfert 1 galaxy NGC 3516 during the flight of Astro-2 in March 1995 using the Hopkins Ultraviolet Telescope. Simultaneous X-ray observations were made using the Japanese X-ray satellite ASCA. The far-UV spectrum shows a reddened power law with f_nu ~ nu (-1.89) and extinction of E(B--V)=0.06. Intrinsic absorption in the ionized resonance doublets of O vi, N v, Si iv, and C iv is visible as well as neutral hydrogen absorption. The redshifted Lyman limit is sharp and opaque. For b = 10 km s(-1) the intrinsic neutral hydrogen column is 3.5 x 10(17) cm(-2) . The ASCA spectrum shows an absorbed power law of energy index ~ 0.9 with prominent O vii and O viii absorption edges. A weak, narrow Fe K emission line from cold material is present as well as a broad, redshifted Fe K feature similar to that reported in MCG-6-30-15 and in NGC 4151. We will discuss warm absorber models for the UV and X-ray absorption. This work was supported by NASA contract NAS 5-27000 and NASA ASCA guest investigator grant NAG 5-2935 to the Johns Hopkins University.

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