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Extreme Ultraviolet Spectroscopy of the Seyfert 1 Galaxy Markarian 478

Published online by Cambridge University Press:  12 April 2016

D.A. Liedahl ,
F. Paerels ,
M.Y. Hur ,
S.M. Kahn ,
A. Fruscione  and
S. Bowyer
D.A. Liedahl
Affiliation:
Lawrence Livermore National Laboratory, L-41, P.O. Box 808, Livermore, CA 94550, USA
F. Paerels
Affiliation:
Physics Department and Space Sciences Laboratory, University of Californiaat Berkeley, Berkeley, CA 94720-7300, USA
M.Y. Hur
Affiliation:
Physics Department and Space Sciences Laboratory, University of Californiaat Berkeley, Berkeley, CA 94720-7300, USA
S.M. Kahn
Affiliation:
Physics Department and Space Sciences Laboratory, University of Californiaat Berkeley, Berkeley, CA 94720-7300, USA
A. Fruscione
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
S. Bowyer
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA

Abstract

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The Seyfert 1 galaxy Mrk 478, observed during the EUVE all-sky survey, is the brightest EUV source among its class. The SW spectrum of this object shows evidence of discrete emission, although this interpretation is tentative, since the source spectrum must be extracted against a bright background. If the EUV flux is, in fact, composed partly of line emission, we consider the implications if this is the result of emission from a collision-driven plasma at temperatures ≳ 106 K. In this context, we discuss some of the constraints imposed on the emission-line region by this observation.

Type
II. Extragalactic Sources in the EUV
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 57 - 61
Copyright
Copyright © Kluwer 1996

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