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Session 50 - Active Galaxies.
Display session, Tuesday, January 16
North Banquet Hall, Convention Center
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 \sim \nu^-1.89 and extinction of E(B--V)=0.06. Intrinsic absorption in the ionized resonance doublets of \sc O vi, \sc N v, Si \sc iv, and \sc 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 \times 10^17 cm^-2. The ASCA spectrum shows an absorbed power law of energy index \sim 0.9 with prominent \sc O vii and \sc 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.
Program listing for Tuesday