The low-frequency radio catalog of flat spectrum sources
F. Massaro (Stanford-SLAC), M. Giroletti (INAF-IRA), R. D'Abrusco, (SAO-Harvard CfA), N. Masetti (INAF-IASF Bologna), A. Paggi (SAO-Harvard, CfA), P. S. Cowperthwaite (Harvard CfA), G. Tosti (University of Perugia), S., Funk (Stanford-SLAC)

TL;DR
This paper presents a new low-frequency radio catalog of flat spectrum sources, extending the radio-gamma-ray connection to MHz frequencies, aiding the search for gamma-ray blazar counterparts.
Contribution
The authors assembled a low-frequency radio catalog combining multiple surveys and defined a new spectral criterion for flat spectrum sources below 1 GHz.
Findings
Catalog lists 28,358 radio sources.
Flat spectrum sources maintain their spectral properties below 1 GHz.
Comparison with higher frequency catalogs reveals spectral shape characteristics.
Abstract
A well known property of the gamma-ray sources detected by COS-B in the 1970s, by the Compton Gamma-ray Observatory in the 1990s and recently by the Fermi observations is the presence of radio counterparts, in particular for those associated to extragalactic objects. This observational evidence is the basis of the radio-gamma-ray connection established for the class of active galactic nuclei known as blazars. In particular, the main spectral property of the radio counterparts associated with gamma-ray blazars is that they show a flat spectrum in the GHz frequency range. Our recent analysis dedicated to search blazar-like candidates as potential counterparts for the unidentified gamma-ray sources (UGSs) allowed us to extend the radio-gamma-ray connection in the MHz regime. We also showed that below 1 GHz blazars maintain flat radio spectra. Thus on the basis of these new results, we…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Radio Astronomy Observations and Technology · Dark Matter and Cosmic Phenomena
