Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chfe.sympe...3b&link_type=abstract
Chandra Fellows Symposium 2001, held 15 October, 2001 at Harvard-Smithsonian Center for Astrophysics, meeting abstract.
Astronomy and Astrophysics
Astrophysics
Scientific paper
I review our recent work on multi-frequency, multi-epoch modeling of blazars (i.e. flat-spectrum radio quasar and BL Lac objects), in particular our recent work on the quasar 3C279 and BL Lacertae. We will see that radio-selected BL Lac objects (such as BL Lacertae itself) are particularly interesting targets of X-ray observations because they may offer a unique opportunity to probe the high-energy portion of the relativistic electron population in extragalactic jets in cases where external photon fields are playing a non-negligible role for the radiation physics and electron dynamics. In the near future, it will be possible to coordinate such X-ray observations with high-energy gamma-ray observations in the multi-GeV regime by ground-based air Cherenkov telescopes and the soon-to-be-launched GLAST satellite. I will discuss how such combined spectral and variability measurements of radio-selected BL Lac observations will help to constrain physical parameters of this class of blazars. In view of the exciting prospects of spectral and variability measurements of radio-selected BL Lac objects, we have carried out a compre- hensive multiwavelength observing campaign of BL Lacertae in the fall of 2000, coordinating radio, optical, X-ray, and gamma-ray observations. The first results of this campaign are now becoming available and will be presented and discussed in this talk. Radio-selected BL Lac objects are an interesting class of blazars, with physical properties intermediate between radio quasars and high- frequency-peaked (or X-ray selected) BL Lac objects. The different sub-classes of blazars present an apparently continuous sequence in their physical properties, the origin of which is not understood at this time. We have recently proposed an evolutionary scenario, which allows us to unify all blazar sub-classes in terms of gradual depletion of the circumnuclear region of quasars, which may even provide a link to the class of radio-quiet quasars (at the high-density end of the sequence) and non-active giant elliptical galaxies (on the low-density end of the sequence).
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