The BL Lacertae objects OQ 530 and S5 0716+714
نویسندگان
چکیده
منابع مشابه
Hidden BL Lacertae Objects Near and Far
I describe two difficulties with current research into the cosmic evolution of BL Lacertae Objects: (1). Possible sample incompleteness due to unrecognized (i.e., “hidden”) BL Lacs; and (2). The absence of a viable physical model of the evolution, to which current and future observations can be compared.
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BL Lacertae objects are an extreme subclass of AGNs showing rapid and large-amplitude variability, high and variable polarization, and core-dominated radio emissions. If a strong beaming effect is the cause of the extreme observation properties, one would expect that these properties would be correlated with each other. Based on the relativistic beaming model, relationships between the polariza...
متن کاملThe Cosmological Evolution of BL Lacertae Objects
We review the main results from several radio, X-ray and multi-frequency surveys on the topic of cosmological evolution of BL Lacertae objects. Updated findings on BL Lac evolution following the recent identification of many sources in the ”Sedentary Multi-Frequency survey” are also discussed. By means of extensive Monte Carlo simulations we test some possible explanations for the peculiar cosm...
متن کاملHighly Polarized Optically-selected Bl Lacertae Objects
Observations of candidate BL Lacertae objects spectroscopically selected from the Sloan Digital Sky Survey (SDSS) reveal a large fraction with high polarization (P > 3%). This result confirms that synchrotron radiation makes an important contribution to the observed optical continuum for most objects in the sample. The SDSS sample can be divided into separate categories, with objects of undeter...
متن کاملOn the relationship between BL Lacertae objects and radio galaxies
We present deep radio images at 1.4 GHz of a large and complete sample of BL Lacertae objects (BL Lacs) selected from the Deep X-ray Radio Blazar Survey (DXRBS). We have observed 24 northern (δ ∼ −30 ◦) sources with the Very Large Array (VLA) in both its A and C configurations and 15 southern sources with the Australia Telescope Compact Array (ATCA) in its largest configuration. We find that in...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021916