The Doppler Effect and Spectral Energy Distribution of Blazars

Details The Doppler Effect and Spectral Energy Distribution of Blazars The Doppler Effect and Spectral Energy Distribution of Blazars

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chjaa...1..213x&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 1, p. 213-220

Astronomy and Astrophysics

Astrophysics

3

Blazars: General, Quasars: General, Radiation Mechanism: Nonthermal

Scientific paper

The relativistic beaming model is adopted to discuss quantitatively the observational differences between radio-selected BL Lac objects (RBLs) and X-ray-selected BL Lac objects (XBLs), and between BL Lac objects and flat spectrum radio quasars (FSRQs). The main results are the following: (1) In the Doppler corrected color-color (αroin-αoxin) diagram, XBLs and FSRQs occupy separated regions, while RBLs bridge the gap between them. These properties suggest that similar intrinsic physical processes operate in all the objects under a range of intrinsic physical conditions. (2) Our results are consistent with the results of Sambruna, Maraschi and Urry (1996) from other methods. We show the αxox introduced by Sambruna to be a good index for describing the energy distribution because it represents the intrinsic energy distribution and includes the Doppler correction. (3) The Doppler effect of relativistic beaming is the main mechanism, and the physical differences (such as magnetic fields, electron energies) are also important complementary factors for understanding the relation between XBLs and RBLs.

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