The Doppler effect and spectral energy distribution of blazars

Xie, GZ Dai, BZ Mei, DC Fan, JH

Gz. Xie et al., The Doppler effect and spectral energy distribution of blazars, CHIN J ASTR, 1(3), 2001, pp. 213-220

48

INGLESE

Article

Space Sciences

CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS

1009-9271 → ACNP

1

3

2001

213 - 220

ISI

1009-9271(200106)1:3<213:TDEASE>2.0.ZU;2-8

The relativistic beaming model is adopted to discuss quantitatively the obs ervational differences between radio-selected BL Lac objects (RBLs) and X-r ay-selected BL Lac objects (XBLs), and between BL Lac objects and flat spec trum radio quasars (FSRQs). The main results are the following: (1) In the Doppler corrected color-color (alpha (in)(ru) - alpha (in)(ox)) diagram, XB Ls and FSRQs occupy separated regions, while RBLs bridge the gap between th em. These properties suggest that similar intrinsic physical processes oper ate 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 alpha (xox) introduced by Sambruna t o be a good index for describing the energy distribution because it represe nts the intrinsic energy distribution and includes the Doppler correction. (3) The Doppler effect of relativistic beaming is the main mechanism, and t he physical differences (such as magnetic fields, electron energies) are al so important complementary factors for understanding the relation between X BLs and RBLs.