J/AJ/148/16 Updated 3CRR sample of radio sources (Singal, 2014)
Discordance of the unified scheme with observed properties of quasars and
high-excitation galaxies in the 3CRR sample.
Singal A.K.
<Astron. J., 148, 16 (2014)>
=2014AJ....148...16S 2014AJ....148...16S
ADC_Keywords: QSOs ; Galaxies, radio ; Redshifts
Keywords: galaxies: active - galaxies: nuclei - quasars: general
Abstract:
We examine the consistency of the unified scheme of Fanaroff-Riley
type II radio galaxies and quasars with their observed number and size
distributions in the 3CRR sample. We separate the low-excitation
galaxies from the high-excitation ones, as the former might not harbor
a quasar within and thus may not be partaking in the unified scheme
models. In the updated 3CRR sample, at low redshifts (z<0.5), the
relative number and luminosity distributions of high-excitation
galaxies and quasars roughly match the expectations from the
orientation-based unified scheme model. However, a foreshortening in
the observed sizes of quasars, which is a must in the
orientation-based model, is not seen with respect to radio galaxies
even when the low-excitation galaxies are excluded. This dashes the
hope that the unified scheme might still work if one includes only the
high-excitation galaxies.
Description:
Our chosen 3CRR sample (Laing et al. 1983, cat. J/MNRAS/204/151) is
radio complete in the sense that all radio sources stronger than its
sensitivity limit S178=10.9Jy are included. The sample covers the
sky north of declination, δ=10°, except for a zone of
avoidance, a band of ±10° about the Galactic plane. Also it
has a 100% optical identification content with detailed optical
spectra to classify radio sources into radio galaxies and quasars.
We have taken the updated optical and radio data from
http://astroherzberg.org/people/chris-willott/research/3crr/.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 52 130 Radio and optical data for our sample
--------------------------------------------------------------------------------
See also:
VIII/14 : 87GB Catalog of radio sources (Gregory et al., 1991)
VIII/3 : An Optical Catalogue of Radio Galaxies (Burbidge+ 1979)
VIII/32 : Extragalactic sources at 5GHz (Jenkins+ 1977)
VIII/4 : Fourth Cambridge Survey (4C) (Pilkington+ 1965; Gower+ 1967)
VIII/1 : The 3C and 3CR Catalogues (Edge+ 1959-1962)
J/MNRAS/204/151 : Bright radio sources at 178 MHz (3CRR) (Laing+ 1983)
http://astroherzberg.org/people/chris-willott/research/3crr/ : 3CRR sample
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- IAU IAU source name (HHMM+DDd; B1950)
10- 17 A8 --- 3CRR 3CRR source name (3C or 4C name)
19- 23 F5.1 Jy S408 [4.3/115.3] Flux density at 408MHz
25- 27 F3.1 --- alpha [0.5/1.2] Spectral index α
29- 31 A3 --- Type Nature of the optical object (1)
33- 36 F4.2 --- z [0.03/2.01] Redshift
38- 41 I4 arcsec theta [3/2440] Largest angular size θ
43- 46 I4 kpc l [21/4408] Linear size
48- 52 E5.1 W/Hz P408 [6e+25/3e+29] Luminosity
--------------------------------------------------------------------------------
Note (1): The optical objects are defined as follows:
HEG = High-Excitation Galaxy;
LEG = Low-Excitation Galaxy;
Q = Quasar;
WQ = Weak Quasar.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 13-Oct-2014