A New Sample of Gamma-Ray Emitting Jetted Active Galactic Nuclei

Abstract

We considered the fourth catalog of gamma-ray point sources produced by the Fermi Large Area Telescope (LAT) and selected only jetted active galactic nuclei (AGN) or sources with no specific classification, but with a low-frequency counterpart. Our final list is composed of 2980 gamma-ray point sources. We then searched for optical spectra in all the available literature and publicly available databases, to measure redshifts and to confirm or change the original LAT classification. Our final list of gamma-ray emitting jetted AGN is composed of BL Lac Objects (40%), flat-spectrum radio quasars (23%), misaligned AGN (2.8%), narrow-line Seyfert 1, Seyfert, and low-ionization nuclear emission-line region galaxies (1.9%). We also found a significant number of objects changing from one type to another, and vice versa (changing-look AGN, 1.1%). About 30% of gamma-ray sources still have an ambiguous classification or lack one altogether.

18 pages, 5 figures, 1 Table. Accepted for publication on Universe, Special Issue "Black Holes and Relativistic Jets", edited by I. Dutan and N. R. MacDonald. This preprint contains only the main text. The full tables A1 and A2 are available on the journal web site (https://www.mdpi.com/2218-1997/8/11/587)

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• Long-term Swift and Metsähovi monitoring of SDSS J164100.10+345452.7 reveals multi-wavelength correlated variability
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• Discovery of a giant radio outburst of the narrow-line Seyfert 1 galaxy SDSS J110546.07+145202.4
• Solid Identification of Extragalactic Gamma-Ray Source Using High-Resolution Radio Interferometric Observation
• Investigating the origin of radio emission in candidate super-Eddington accreting black holes
• Rapid jet ejection from PKS 0215+015 coincident with a high-energy neutrino event
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• Radio Properties of Narrow-Line and Broad-Line Seyfert 1 Galaxies
• Detection of new very-high-energy sources outside the galactic plane in the Fermi-LAT data
• Hunting Star-Forming Galaxies in the Gamma-Ray Domain
• Optimising an Array of Cherenkov Telescopes in Australia for the Detection of TeV Gamma-Ray Transients