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Three new BL Lacertae objects in the Palomar-Green survey

DOI

27

Citations

0

References

1993

Year

T. A. Fleming, Richard F. Green, Buell T. Jannuzi, James Liebert, Paul S. Smith, H. H. Fink
The Astronomical Journal

Abstract

We have identified three BL Lacertae objects in the Palomar-Green Survey which were previously misclassified as DC white dwarfs, namely PG 1246+586, PG 1424+240, and PG 1437+398. Our reclassification is based on the detection of these objects as x-ray sources in the ROSAT all-sky survey and upon our subsequent detection of intrinsic linearly polarized and variable optical emission from these sources. As a result of the ROSAT survey, the number of identified BL Lac objects in the Palomar- Green catalog of UV excess objects has been doubled. Corrected optical positions are presented for PG 1246+586 and PG 1437+398.