The University of Southampton
University of Southampton Institutional Repository

FR0 CAT: a FIRST catalog of FR 0 radio galaxies

FR0 CAT: a FIRST catalog of FR 0 radio galaxies
FR0 CAT: a FIRST catalog of FR 0 radio galaxies
With the aim of exploring the properties of the class of FR 0 radio galaxies, we selected a sample of 108 compact radio sources, called FR0CAT, by combining observations from the NVSS, FIRST, and SDSS surveys. We included in the catalog sources with redshift ≤0.05, with a radio size ≲5 kpc, and with an optical spectrum characteristic of low-excitation galaxies. Their radio luminosities at 1.4 GHz are in the range 1038 ≲ νL1.4 ≲ 1040 erg s-1. The FR0CAT hosts are mostly (86%) luminous (−21 ≳ Mr ≳ −23) red early-type galaxies with black hole masses 108 ≲ MBH ≲ 109M⊙. These properties are similar to those seen for the hosts of FR I radio galaxies, but they are on average a factor ~1.6 less massive. The number density of FR0CAT sources is ~5 times higher than that of FR Is, and thus they represent the dominant population of radio sources in the local Universe. Different scenarios are considered to account for the smaller sizes and larger abundance of FR 0s with respect to FR Is. An age-size scenario that considers FR 0s as young radio galaxies that will all eventually evolve into extended radio sources cannot be reconciled with the large space density of FR 0s. However, the radio activity recurrence, with the duration of the active phase covering a wide range of values and with short active periods strongly favored with respect to longer ones, might account for their large density number. Alternatively, the jet properties of FR 0s might be intrinsically different from those of the FR Is, the former class having lower bulk Lorentz factors, possibly due to lower black hole spins. Our study indicates that FR 0s and FR I/IIs can be interpreted as two extremes of a continuous population of radio sources that is characterized by a broad distribution of sizes and luminosities of their extended radio emission, but shares a single class of host galaxies.
0004-6361
1-10
Baldi, R.D.
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Capetti, A.
1e4d3117-8900-47a5-8fe1-37b1b1574a5c
Massaro, F.
63d680a4-31d0-42b1-9c46-807e794a0feb
Baldi, R.D.
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Capetti, A.
1e4d3117-8900-47a5-8fe1-37b1b1574a5c
Massaro, F.
63d680a4-31d0-42b1-9c46-807e794a0feb

Baldi, R.D., Capetti, A. and Massaro, F. (2018) FR0 CAT: a FIRST catalog of FR 0 radio galaxies Astronomy & Astrophysics, 609, pp. 1-10. (doi:10.1051/0004-6361/201731333).

Record type: Article

Abstract

With the aim of exploring the properties of the class of FR 0 radio galaxies, we selected a sample of 108 compact radio sources, called FR0CAT, by combining observations from the NVSS, FIRST, and SDSS surveys. We included in the catalog sources with redshift ≤0.05, with a radio size ≲5 kpc, and with an optical spectrum characteristic of low-excitation galaxies. Their radio luminosities at 1.4 GHz are in the range 1038 ≲ νL1.4 ≲ 1040 erg s-1. The FR0CAT hosts are mostly (86%) luminous (−21 ≳ Mr ≳ −23) red early-type galaxies with black hole masses 108 ≲ MBH ≲ 109M⊙. These properties are similar to those seen for the hosts of FR I radio galaxies, but they are on average a factor ~1.6 less massive. The number density of FR0CAT sources is ~5 times higher than that of FR Is, and thus they represent the dominant population of radio sources in the local Universe. Different scenarios are considered to account for the smaller sizes and larger abundance of FR 0s with respect to FR Is. An age-size scenario that considers FR 0s as young radio galaxies that will all eventually evolve into extended radio sources cannot be reconciled with the large space density of FR 0s. However, the radio activity recurrence, with the duration of the active phase covering a wide range of values and with short active periods strongly favored with respect to longer ones, might account for their large density number. Alternatively, the jet properties of FR 0s might be intrinsically different from those of the FR Is, the former class having lower bulk Lorentz factors, possibly due to lower black hole spins. Our study indicates that FR 0s and FR I/IIs can be interpreted as two extremes of a continuous population of radio sources that is characterized by a broad distribution of sizes and luminosities of their extended radio emission, but shares a single class of host galaxies.

Text FR0 CAT: A FIRST catalog of FR 0 radio galaxies - Accepted Manuscript
Download (461kB)

More information

Accepted/In Press date: 22 August 2017
e-pub ahead of print date: 22 December 2017
Published date: January 2018

Identifiers

Local EPrints ID: 417466
URI: https://eprints.soton.ac.uk/id/eprint/417466
ISSN: 0004-6361
PURE UUID: d9b58e80-9b05-476a-9ce5-9800600989f4

Catalogue record

Date deposited: 31 Jan 2018 17:30
Last modified: 02 Feb 2018 17:30

Export record

Altmetrics

Contributors

Author: R.D. Baldi
Author: A. Capetti
Author: F. Massaro

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Library staff edit
Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×