Blazar Radio and Optical Survey (BROS): A catalog of blazar candidates showing flat radio spectrum and their optical identification in Pan-STARRS1 Surveys
Ryosuke Itoh, Yousuke Utsumi, Yoshiyuki Inoue, Kouji Ohta, Akihiro, Doi, Tomoki Morokuma, Koji S. Kawabata, Yasuyuki T. Tanaka

TL;DR
The BROS catalog provides a comprehensive list of blazar candidates with flat radio spectra and optical IDs, revealing two distinct populations and including previously missed elliptical-like objects, aiding high-energy astrophysics research.
Contribution
This work presents a new, extensive blazar candidate catalog with lower flux thresholds, identifying two populations and including elliptical-like sources missed by previous surveys.
Findings
Identification of two distinct blazar populations in color-magnitude space.
Discovery of a previously missed elliptical-like blazar population.
The catalog's potential for high-energy astrophysics applications.
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 and outside the galactic plane (). We list compact flat-spectrum radio sources of ( is defined as ) 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…
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