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- W4286783809 abstract "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 declination $delta > -40^{circ}$ and outside the galactic plane ($|b| > 10^{circ}$). We list compact flat-spectrum radio sources of $alpha > -0.6$ ($alpha$ is defined as $F_{nu} propto nu^alpha$ ) from 0.15~GHz TGSS and 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, An 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. We emphasize that the latter population is missed by previous catalogs but newly emerged in the present BROS catalog, 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 $lesssim$ 0.5, which is also supported by the logN-logS distribution of the power-law index of $1.49 pm 0.05$. 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 Cherenkov Telescope Array." @default.
- W4286783809 created "2022-07-24" @default.
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- W4286783809 date "2020-07-31" @default.
- W4286783809 modified "2023-09-24" @default.
- W4286783809 title "Blazar Radio and Optical Survey (BROS): A catalog of blazar candidates showing flat radio spectrum and their optical identification in Pan-STARRS1 Surveys" @default.
- W4286783809 doi "https://doi.org/10.48550/arxiv.2008.00038" @default.
- W4286783809 hasPublicationYear "2020" @default.
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