Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995deps.rept....1h&link_type=abstract
In Columbia Univ., Diffuse Emission and Pathological Seyfert Spectra p 1-11 (SEE N96-13426 02-89)
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, H Alpha Line, Infrared Radiation, Seyfert Galaxies, Star Formation, Starburst Galaxies, Stellar Luminosity, X Ray Astronomy, X Ray Spectra, Astronomical Spectroscopy, Rosat Mission, Sky Surveys (Astronomy), Spectral Sensitivity, X Ray Spectroscopy
Scientific paper
We continue to investigate recurrent claims that a substantial number of 'normal' star-forming galaxies may have X-ray luminosities in the range 1042-44 ergs/s. In this installment, we present new spectra of four such emission-line galaxies that were ambiguously classified in the Einstein Extended Medium Sensitivity Survey (EMSS), and find that they all have intermediate-type Seyfert nuclei as evidenced by broad components of their H alpha lines. We argue that any of the remaining emission-line galaxies in the EMSS with 1042 is less than L(x) is less than 10(exp44) ergs/s 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-selected emission-line galaxies, X-ray luminosities in excess of 1042 ergs/s 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-luminous starbursts.
Halpern Jules P.
Helfand David J.
Moran Edward C.
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