期刊
ASTROPHYSICAL JOURNAL
卷 910, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/abe308
关键词
Surveys; Astronomical methods; Catalogs; Radio galaxies; Radio active galactic nuclei
资金
- Polish National Science Centre (NCN) [2013/09/B/ST9/00026]
- NCN grant [2015/18/A/ST9/00746, 2016/21/B/ST9/01620]
- Royal Society
- Newton Fund via the award of a Royal Society-Newton Advanced Fellowship [NAF\R1\180403]
- Fundacao de Amparo a Pesquisa e Inovacao de Santa Catarina (FAPESC)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Jagiellonian University
- Paris Observatory
- FAPESP [2018/21661-9]
- South African Research Chairs Initiative of the Department of Science and Innovation [64789]
- National Research Foundation12 of South Africa
- NCN [2018/29/B/ST9/02298]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
Based on the analysis of over 32,000 radio sources associated with optical galaxies in the ROGUE I catalog, this study provides two diagnostics, MIRAD and DLM, to select radio-AGNs. These diagnostics can be applied independently and compare different fluxes and break strengths, proposing simple dividing lines for classification. The research reveals that radio-AGNs are preferentially found among elliptical galaxies and galaxies hosting the most massive black holes.
Basing our analysis on ROGUE I, a catalog of over 32,000 radio sources associated with optical galaxies, we provide two diagnostics to select the galaxies where the radio emission is dominated by an active galactic nucleus (AGN), referred to in the paper as radio-AGNs. Each of these diagnostics can be applied independently. The first one, dubbed MIRAD, compares the flux F-W3 in the W3 mid-infrared band of the Wide-field Infrared Survey Explorer telescope, with the radio flux at 1.4 GHz, F-1.4. MIRAD requires no optical spectra. The second diagnostic, dubbed DLM, compares the 4000 A break strength, D-n(4000), with the radio luminosity per unit stellar mass. The DLM diagram has already been used in the past, but not as stand-alone. For these two diagrams, we propose simple, empirical dividing lines that result in the same classification for the objects in common. These lines correctly classify as radio-AGN 99.5% of the extended radio sources in the ROGUE I catalog, and as star-forming galaxies 98%-99% of the galaxies identified as such by their emission-line ratios. Both diagrams clearly show that radio-AGNs are preferentially found among elliptical galaxies and among galaxies hosting the most massive black holes. Most of the radio sources classified as radio-AGNs in the MIRAD or DLM diagrams are either optically weak AGNs or retired galaxies.
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