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FRIICAT: A FIRST catalog of FR II radio galaxies

FRIICAT: A FIRST catalog of FR II radio galaxies
FRIICAT: A FIRST catalog of FR II radio galaxies
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.
0004-6361
Capetti, Alessandro
4b5a2e61-ac39-42ca-aa3e-15983b11146c
Massaro, Francesco
c2abbd1a-e120-4cae-ac4d-0534d0c4d4ef
Baldi, Ranieri Diego
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Capetti, Alessandro
4b5a2e61-ac39-42ca-aa3e-15983b11146c
Massaro, Francesco
c2abbd1a-e120-4cae-ac4d-0534d0c4d4ef
Baldi, Ranieri Diego
c416ed4c-5d1c-48ee-989c-3a8ab38cd124

Capetti, Alessandro, Massaro, Francesco and Baldi, Ranieri Diego (2017) FRIICAT: A FIRST catalog of FR II radio galaxies. Astronomy & Astrophysics. (doi:10.1051/0004-6361/201630247).

Record type: Article

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.

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Accepted/In Press date: 30 January 2017
e-pub ahead of print date: 8 May 2017

Identifiers

Local EPrints ID: 412604
URI: https://eprints.soton.ac.uk/id/eprint/412604
ISSN: 0004-6361
PURE UUID: a34da939-5abd-4283-b934-136f68f52003

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Date deposited: 24 Jul 2017 16:32
Last modified: 18 Jul 2019 11:42

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