A Possible Estimate of the Doppler Factors for Blazars

Details A Possible Estimate of the Doppler Factors for Blazars A Possible Estimate of the Doppler Factors for Blazars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59.1061x&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.59, No.6, pp.1061--1069

Astronomy and Astrophysics

Astronomy

1

Bl Lacertae Objects: General, Galaxies: Active, Galaxies: Nuclei

Scientific paper

We have studied the beaming effect and multi-band properties of blazars using a sample of 31blazars. In the sample, the observed variability timescale, the mass of the central super-massive black hole (SMBH), and the flux densities at 4energy bands (radio, optical, X-ray, and γ-ray) of each object were compiled from the literature. The Doppler factor was estimated in two cases: (1) considering that the Doppler factor is the same throughout the entire energy band, and calculating by using the observed variability timescale; (2) the Doppler factor is a function of frequency, i.e., the Doppler factor is variable in a different energy band. Based on the Doppler factor estimated in both cases, we find that the intrinsic flux densities at different energy bands are significantly correlated with each other.

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