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- Title
FRIICAT: A FIRST catalog of FR II radio galaxies.
- Authors
Capetti, A.; Massaro, F.; Baldi, R. D.
- Abstract
Aims: We built a catalog of 122 FR II radio galaxies, called FRIICAT, selected from a published sample obtained by combining observations from the NVSS, FIRST, and SDSS surveys. The catalog includes sources with redshift = 0.15, an edge-brightened radio morphology, and those with at least one of the emission peaks located at radius r larger than 30 kpc from the center of the host. Methods: The radio luminosity at 1.4 GHz of the FRIICAT sources covers the range L1.4 ~ 1039.5-1042.5erg s-1. The FRIICAT catalog has 90% of low and 10% of high excitation galaxies (LEGs and HEGs), respectively. The properties of these two classes are significantly different. The FRIICAT LEGs are mostly luminous (-20 ≳ Mr ≳ -24), red early-type galaxies with black hole masses in the range 108 ≲ MBH ≲ 109M⊙; they are essentially indistinguishable from the FR Is belonging to the FRICAT. The HEG FR IIs are associated with optically bluer and mid-IR redder hosts than the LEG FR IIs and to galaxies and black holes that are smaller, on average, by a factor ~2. Results: FR IIs have a factor ~3 higher average radio luminosity than FR Is. Nonetheless, most (~ 90%) of the selected FR IIs have a radio power that is lower, by as much as a factor of ~100, than the transition value between FR Is and FR IIs found in the 3C sample. The correspondence between the morphological classification of FR I and FR II and the separation in radio power disappears when including sources selected at low radio flux thresholds, which is in line with previous results. In conclusion, a radio source produced by a low power jet can be edge brightened or edge darkened, and the outcome is not related to differences in the optical properties of the host galaxy.
- Subjects
RADIO galaxies; REDSHIFT; GALACTIC center; EXCITATION spectrum; BLACK holes
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2017, Vol 601, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201630247