Astrophys. J., 901, 3-3 (2020/September-3)
Blazar Radio and Optical Survey (BROS): a catalog of blazar candidates showing flat radio spectrum and their optical identification in Pan-STARRS1 surveys.
ITOH R., UTSUMI Y., INOUE Y., OHTA K., DOI A., MOROKUMA T., KAWABATA K.S. and TANAKA Y.T.
Abstract (from CDS):
Utilizing the latest and the most sensitive radio and optical catalogs, we completed a new blazar candidate catalog, Blazar Radio and Optical Survey (BROS), which includes 88,211 sources located at decl. δ > -40° and outside the galactic plane (| b| > 10○). We list compact flat-spectrum radio sources of α > -0.6 (α is defined as Fν ∝ να) from 0.15 GHz TGSS to 1.4 GHz NVSS catalogs. We further identify optical counterparts of the selected sources by cross-matching with Pan-STARRS1 photometric data. Color-color and color-magnitude plots for the selected BROS sources clearly show two distinct populations, a "quasar-like" population consisting of both flat-spectrum radio quasars and BL Lac type objects. On the other hand, an "elliptical-like" population of mostly BL Lac type objects is buried in the elliptical galaxy. The latter population is also reported in previous catalogs, but the BROS catalog provided a new larger sample of this population, due to the lower radio flux threshold of our selection. Model calculations show that the "elliptical-like" population consists of elliptical galaxies located at redshift z <= 0.5, which is also supported by the logN-logS distribution of the power-law index of 1.49 ± 0.05. This BROS catalog is useful for identifying the electromagnetic counterparts of ultra-high-energy cosmic rays and PeV neutrinos recently detected by IceCube, as well as nearby BL Lac objects detectable by future high-sensitivity TeV telescopes, such as the Cherenkov Telescope Array.
© 2020. The American Astronomical Society. All rights reserved.
Blazars - Radio active galactic nuclei - Catalogs
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