The Doppler effect and spectral energy distribution of blazars

Citation
Gz. Xie et al., The Doppler effect and spectral energy distribution of blazars, CHIN J ASTR, 1(3), 2001, pp. 213-220
Citations number
48
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
ISSN journal
1009-9271 → ACNP
Volume
1
Issue
3
Year of publication
2001
Pages
213 - 220
Database
ISI
SICI code
1009-9271(200106)1:3<213:TDEASE>2.0.ZU;2-8
Abstract
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.