Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219l..85m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 219, Jan. 15, 1978, p. L85-L87.
Astronomy and Astrophysics
Astrophysics
67
Astronomical Spectroscopy, Elliptical Galaxies, Galactic Radiation, Luminous Intensity, Apertures, Spectroscopic Telescopes
Scientific paper
Spectroscopic observations of BL Lacertae performed through an annular aperture attached to a 3-m reflector are reported which demonstrate unequivocally that the prototype of the BL Lac class of objects is located in a luminous elliptical galaxy with a redshift of 0.0695 + or - 0.001. The general continuum level of the galaxy (with scattered light removed) is determined as 9.21 by 10 to the -28th power erg/sec per Hz at 5480 A and 3.13 by 10 to the -28th power erg/sec per Hz at 4400 A, which correspond to magnitudes of 19.00 and 20.17, respectively. The absolute magnitude of the galaxy associated with BL Lac is estimated to be -21.7, and the spectrum of this galaxy is shown to be entirely normal for a luminous elliptical. It is noted that the central source varies from a luminosity roughly comparable to that of the galaxy to an amount over 10 times greater.
French H. B.
Hawley Steven A.
Miller Jeffrey S.
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