TY - JOUR
T1 - A sample of radio galaxies spanning three decades in radio luminosity - I. The host galaxy properties and black hole masses
AU - McLure, Ross J.
AU - Willott, Chris J.
AU - Jarvis, Matt J.
AU - Rawlings, Steve
AU - Hill, Gary J.
AU - Mitchell, Ewan
AU - Dunlop, James S.
AU - Wold, Margrethe
PY - 2004/6/1
Y1 - 2004/6/1
N2 - The results of analysis of HST I-band imaging of a sample of 41 radio
galaxies spanning three orders of magnitude in radio luminosity at
redshift z~= 0.5 are presented. These results represent the first stage
in a coordinated programme to study the connection between radio
luminosity and host galaxy properties, black hole masses and cluster
environments in radio galaxies spanning a wide range in radio luminosity
over a restricted range in redshift. The full sample is comprised of
objects drawn from four complete, low-frequency selected radio samples
with progressively fainter flux-density limits (3CRR, 6CE, 7CRS and the
new TexOx-1000 sample). Modelling of the HST imaging data shows that the
host galaxies have surface-brightness distributions consistent with
those expected for classic ellipticals (Sérsic parameter,
β~= 0.25), with β in the range 0.17 <β <0.30, and
a mean of = 0.23 +/- 0.01. The luminosities of the host
galaxies are found to be comparable with those of galaxies drawn from
the bright end of the local cluster galaxy luminosity function, spanning
the range 0.7L* <L <10 L*, with a mean of
3.2 +/- 0.3L*, after correcting for the effects of passive
evolution. In addition, the radio galaxies are shown to follow a
Kormendy (μe-re) relation indistinguishable
from that of both powerful low-redshift radio galaxies and local Abell
brightest cluster galaxies (BCGs). Combining our new results with those
in the literature it is found that the scalelengths and Kormendy
relations of 3C-class radio galaxies do not vary significantly over the
redshift range 0.0 <z <0.8, providing no evidence for dynamical
evolution of this class of host galaxy within this redshift interval.
Converting the host galaxy luminosities into black hole mass estimates,
using the local Mbh-Mbulge correlation, predicts
that the radio galaxies harbour central black holes with masses in the
range 108.1 Msolar <Mbh <
109.5 Msolar, with a geometric mean of
= 108.87+/-0.04 Msolar.
Finally, a significant (~= 3σ) correlation is found between black
hole mass and 151-MHz radio luminosity for those objects in the sample
with either high-excitation nuclear spectra or classical double radio
structures.
AB - The results of analysis of HST I-band imaging of a sample of 41 radio
galaxies spanning three orders of magnitude in radio luminosity at
redshift z~= 0.5 are presented. These results represent the first stage
in a coordinated programme to study the connection between radio
luminosity and host galaxy properties, black hole masses and cluster
environments in radio galaxies spanning a wide range in radio luminosity
over a restricted range in redshift. The full sample is comprised of
objects drawn from four complete, low-frequency selected radio samples
with progressively fainter flux-density limits (3CRR, 6CE, 7CRS and the
new TexOx-1000 sample). Modelling of the HST imaging data shows that the
host galaxies have surface-brightness distributions consistent with
those expected for classic ellipticals (Sérsic parameter,
β~= 0.25), with β in the range 0.17 <β <0.30, and
a mean of = 0.23 +/- 0.01. The luminosities of the host
galaxies are found to be comparable with those of galaxies drawn from
the bright end of the local cluster galaxy luminosity function, spanning
the range 0.7L* <L <10 L*, with a mean of
3.2 +/- 0.3L*, after correcting for the effects of passive
evolution. In addition, the radio galaxies are shown to follow a
Kormendy (μe-re) relation indistinguishable
from that of both powerful low-redshift radio galaxies and local Abell
brightest cluster galaxies (BCGs). Combining our new results with those
in the literature it is found that the scalelengths and Kormendy
relations of 3C-class radio galaxies do not vary significantly over the
redshift range 0.0 <z <0.8, providing no evidence for dynamical
evolution of this class of host galaxy within this redshift interval.
Converting the host galaxy luminosities into black hole mass estimates,
using the local Mbh-Mbulge correlation, predicts
that the radio galaxies harbour central black holes with masses in the
range 108.1 Msolar <Mbh <
109.5 Msolar, with a geometric mean of
= 108.87+/-0.04 Msolar.
Finally, a significant (~= 3σ) correlation is found between black
hole mass and 151-MHz radio luminosity for those objects in the sample
with either high-excitation nuclear spectra or classical double radio
structures.
U2 - 10.1111/j.1365-2966.2004.07793.x
DO - 10.1111/j.1365-2966.2004.07793.x
M3 - Article
VL - 351
SP - 347
EP - 361
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
ER -