Recognizing Blazars Using Radio Morphology from the VLA Sky Survey
The Astrophysical Journal(2024)
摘要
Blazars are radio-loud Active Galactic Nuclei (AGN) whose jets have a very
small angle to our line of sight. Observationally, the radio emission are
mostly compact or a compact-core with a 1-sided jet. With 2.5^''
resolution at 3 GHz, the Very Large Array Sky Survey (VLASS) enables us to
resolve the structure of some blazar candidates in the sky north of Decl. -40
deg. We introduce an algorithm to classify radio sources as either blazar-like
or non-blazar-like based on their morphology in the VLASS images. We apply our
algorithm to three existing catalogs, including one of known blazars
(Roma-BzCAT) and two of blazar candidates identified by WISE colors and radio
emission (WIBRaLS, KDEBLLACS). We show that in all three catalogs, there are
objects with morphology inconsistent with being blazars. Considering all the
catalogs, more than 12
this analysis. Notably, we show that 3
could be a misclassification based on their VLASS morphology. The resulting
table with all sources and their radio morphological classification is
available online.
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