An updated list of BL Lac objects, and their relation to galaxies and quasistellar objects

Details An updated list of BL Lac objects, and their relation to galaxies and quasistellar objects An updated list of BL Lac objects, and their relation to galaxies and quasistellar objects

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93....1b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, Jan. 1987, p. 1-5.

Astronomy and Astrophysics

Astronomy

93

Astronomical Catalogs, Bl Lacertae Objects, Galaxies, Hubble Diagram, Quasars, Red Shift, Balmer Series, Emission Spectra, Line Spectra

Scientific paper

An updated list of BL Lac objects taken from the catalog of QSOs and BL Lac objects which we have recently compiled is given in Table I. Redshifts of about one-third are known. The majority of these have redshifts which can be attributed to underlying galaxies. A plot of the Hubble diagram for these objects suggests that all of them in this class lie in bright galaxies with Mv = -22.5. They are easily distinguished from those BL Lac objects which show weak broad emission lines or high-redshift absorption systems. In the conclusion, a brief discussion of the characteristics of the different types of objects classified as BL Lac objects is given.

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