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Title:
Two optically dull galaxies with strong nuclear X-ray sources
Authors:
Elvis, M.; Schreier, E. J.; Tonry, J.; Davis, M.; Huchra, J. P.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.)
Publication:
Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 20-27. (ApJ Homepage)
Publication Date:
05/1981
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
GALACTIC NUCLEI, GALACTIC RADIATION, LINE SPECTRA, RADIO SOURCES (ASTRONOMY), SPECTRUM ANALYSIS, X RAY SOURCES, ABSORPTION SPECTRA, ACTIVE GALAXIES, BL LACERTAE OBJECTS, EMISSION SPECTRA, H BETA LINE, HEAO 2, LUMINOSITY, OPTICAL PROPERTIES
Comment:
A&AA ID. AAA029.158.229
DOI:
10.1086/158894
Bibliographic Code:
1981ApJ...246...20E

Abstract

The paper reports the detection by the Einstein Observatory High Resolution Imager of compact, probably variable, X-ray sources in the nuclei of NGC 3862 (= 3C 264) and NGC 4156 with luminosities of the order of 10 to the 42nd ergs/s (0.5-4.5 keV). Neither galaxy has an optical spectrum that would suggest such strong activity. One of the galaxies, NGC 4156, has the weakest emission line fluxes of any known X-ray active galaxy. Its H-beta/L-x ratio, however, is in keeping with previous results. The other galaxy, NGC 3862, has a normal galactic absorption line spectrum with no detectable Balmer emission, putting its H-beta/L-x ratio clearly above the expected value; this suggests its nucleus is similar to a low-luminosity BL Lac object.

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