Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-30T10:55:05.488Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

Allen, C.W. 1973, Astrophysical Quantities, 3rd Ed., London, The Athlone Press Google Scholar
Arnaud, M., & Raymond, J.C. 1992, ApJ, 398, 394 Google Scholar
Barvainis, R. 1993, ApJ, 412, 513 CrossRefGoogle Scholar
Bowyer, S., & Malina, R.F. 1991, in Extreme Ultraviolet Astronomy, ed. Malina, R.F. & Bowyer, S. Pergamon Press: New York, 397 Google Scholar
Elvis, M., Giommi, P., Wilkes, B.J., & McDowell, J. 1991, ApJ, 378, 537 CrossRefGoogle Scholar
Gondhalekar, P.M., Kellett, B.J., Pounds, K.A., Matthews, L., & Quenby, J.J. 1994, MNRAS, 268, 973 Google Scholar
Guilbert, P.W., & Rees, M.J. 1988, MNRAS, 233, 475 CrossRefGoogle Scholar
Hamann, F., Zuo, L., & Tytler, D. 1992, ApJ, 444, L69 Google Scholar
Kaastra, J.S., Roos, N., & Mewe, R. 1995a, A&A, in pressGoogle Scholar
Kaastra, J.S., Roos, N., & Mewe, R. 1995b, A&A, these proceedingsGoogle Scholar
Liedahl, D.A., Osterheld, A.L., & Goldstein, W.H. 1995, in preparationGoogle Scholar
Marshall, H.L. 1995, these proceedingsGoogle Scholar
Marshall, H.L., Carone, T.E., Shull, J.M., Malkan, M.A., & Elvis, M. 1995, ApJ, submittedGoogle Scholar
Marshall, H.L., Fruscione, A., & Carone, T.E. 1995, ApJ, 439, 90 Google Scholar
Mewe, R., Gronenscheld, E.H.B.M., & Van Den Oord, G.H.J. 1985, A&AS, 62, 197 Google Scholar
Nandra, K., & Pounds, K.A. 1992, Nature, 359, 215 Google Scholar
Pounds, K.A., et al. 1993, MNRAS, 260, 77 Google Scholar
Rees, M.J. 1984, ARA&A, 22, 471 Google Scholar
Zdziarski, A.A., Ghisellini, G., George, I.M., Svennson, R., Fabian, A.C., & Done, C. 1990, ApJ, 363, L1 Google Scholar