FRIICAT: A FIRST catalog of FR~II radio galaxies
Journal
Date Issued
2017
Author(s)
Abstract
We built a catalog of 122 FR~II radio galaxies, called FRII{\sl{CAT}},
selected from a published sample obtained by combining observations from the
NVSS, FIRST, and SDSS surveys. The catalog includes sources with redshift $\leq
0.15$, 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. The radio luminosity at 1.4 GHz of the \FRII\ sources covers the range
$L_{1.4} \sim 10^{39.5} - 10^{42.5}$ $\ergs$. The \FRII\ 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 FRII{\sl{CAT}}
LEGs are mostly luminous ($-20 \gtrsim M_r \gtrsim -24$), red early-type
galaxies with black hole masses in the range $10^8 \lesssim M_{\rm BH} \lesssim
10^9 M_\odot$; they are essentially indistinguishable from the FR~Is belonging
to the FRI{\sl{CAT}}. 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 $\sim$2.
FR~IIs have a factor $\sim$ 3 higher average radio luminosity than FR~Is.
Nonetheless, most ($\sim 90$ \%) of the selected FR~IIs have a radio power that
is lower, by as much as a factor of $\sim$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.
Volume
601
Start page
A81
Issn Identifier
0004-6361
Ads BibCode
2017A&A...601A..81C
Rights
open.access
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