Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...585l..23f&link_type=abstract
The Astrophysical Journal, Volume 585, Issue 1, pp. L23-L24.
Astronomy and Astrophysics
Astronomy
12
Galaxies: Bl Lacertae Objects: General, Galaxies: Jets, Galaxies: Quasars: General
Scientific paper
Blazars have two subclasses, namely, BL Lacertae objects and flat-spectrum radio quasars. The two subclasses share many similar observational properties, but their difference in emission lines cannot be ignored. What causes the difference? In this Letter, we propose a method to determine the intrinsic ratio, f, of the comoving luminosity in the jet to the unbeamed luminosity and find that f in BL Lacertae objects is greater than that in flat-spectrum radio quasars. Therefore, the emission from the jet will dominate the unbeamed (line emission) part in BL Lacertae objects. However, in the case of flat-spectrum radio quasars, the emissions from the jet are comparable to the unbeamed part. We propose that the difference in f perhaps plays an important role in the different emission-line properties of BL Lacertae objects and flat-spectrum radio quasars and that there is no evolution effect between the two subclasses of blazars.
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