NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-21 T16:16:33 PDT
Help | Comment | NED Home

For refcode 1997AJ....114.1736H:
Retrieve 7 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1997AJ....114.1736H E 0336-248: A NEW BL LAC OBJECT FOUND BY AN OLD EINSTEIN JULES P. HALPERN AND MICHAEL ERACLEOUS Department of Astronomy, University of California, Berkeley, California 94720 Electronic mail: jules@astro.columbia.edu KARL FORSTER Department of Astronomy, Columbia University, 550 West 120th Street, New York, New York 10027 Received 1997 May 5; revised 1997 July 21 ABSTRACT We obtained new ROSAT HRI and optical observations in the field of the Einstein X-ray source E 0336-248, which we use to identify it as a 19th magnitude BL Lacertae object at z = 0.251 with L_x_ = 1 X 10^45^ erg s^- 1^. It is also a 14 mJy radio source at 20 cm. An emission-line galaxy at z = 0.043 that was previously considered a Seyfert identification for E 0336-248 is shown instead to be an unrelated, nonactive H II region galaxy that lies 78" from the X-ray source. The resolution of this historical case of mistaken identity illustrates that discoveries of non- AGN emission-line galaxies with high X-ray luminosity should be tested carefully. The properties of E 0336-248 are similar to those of other X- ray selected BL Lacs, including its location in an apparent group or cluster of galaxies. Somewhat unusual is the weak contribution of nonstellar optical light relative to the starlight in the spectrum of its host galaxy, which raises once again the possibility that even high- luminosity BL Lac objects may be difficult to identify in X-ray selected samples. We discuss a possible manifestation of this problem that appeared in the recent literature.
Retrieve 7 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home