No X-ray-luminous starbursts in the {ital Einstein} medium sensitivity survey, either
- Columbia Astrophysics Laboratory, Columbia University, 538 West 120th Street, New York, New York 10027 (United States)
- Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, L-413, Livermore, California 94450 (United States)
We continue to investigate recurrent claims that a substantial number of {open_quote}{open_quote}normal{close_quote}{close_quote} star-forming galaxies may have X-ray luminosities in the range 10{sup 42{endash}44} ergss{sup {minus}1}. In this installment, we present new spectra of four such emission-line galaxies that were ambiguously classified in the {ital Einstein} Extended Medium Sensitivity Survey (EMSS), and find that they all have intermediate-type Seyfert nuclei as evidenced by broad components of their {ital H}{alpha} lines. We argue that any of the remaining emission-line galaxies in the EMSS with 10{sup 42}{lt}{ital L}{sub {ital x}}{lt}10{sup 44} ergss{sup {minus}1} that were flagged as needing further spectroscopic work are almost certain to have active nuclei as well. We conclude that in these as well as other samples of X-ray{endash}selected emission-line galaxies, X-ray luminosities in excess of 10{sup 42} ergss{sup {minus}1} can and should be attributed to an active nucleus, even in the case that most of the infrared continuum or optical emission-line luminosity is caused by star formation. There is as yet no good evidence for X-ray{endash}luminous starbursts. {copyright} {ital 1995 The American Astronomical Society.}
- OSTI ID:
- 278636
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 453; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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