Optical Spectra Evolution of BL Lac Objects

Details Optical Spectra Evolution of BL Lac Objects Optical Spectra Evolution of BL Lac Objects

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011japa...32..109b&link_type=abstract

Journal of Astrophysics and Astronomy, Volume 32, Issue 1-2, pp. 109-112

Astronomy and Astrophysics

Astrophysics

Galaxies: Active, Galaxies: Evolution, Bl Lac Objects: General, Galaxies, Active—Galaxies, Evolution—Bl Lac Objects, General

Scientific paper

Many quasi-simultaneous optical observations of nine BL Lac objects are obtained from literature. We study the relationship between the optical spectral index and the luminosity of BL Lac objects, and are tempted to exploit spectral evolution in the optical frequency ranges. Our results show that: (i) The optical spectra index of the low-frequency peaked BL Lac objects (LBLs) is steeper than the high-frequency peaked BL Lac objects (HBLs); (ii) The spectra tend to be softer when the source becomes brighter for LBLs and the intermediate BL Lac objects (IBLs) (i.e., bluer-when-brighter), and the spectra of HBLs does not vary when the brightness of HBLs changes. Possible explanations are briefly discussed for this phenomenon.

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