J/ApJ/744/84 Combined sample of radio-loud AGNs at 408MHz (Yuan+, 2012)
On the evolution of the cores of radio sources and their extended radio
emission.
Yuan Z., Wang J.
<Astrophys. J., 744, 84 (2012)>
=2012ApJ...744...84Y 2012ApJ...744...84Y
ADC_Keywords: Active gal. nuclei ; Radio continuum ; Redshifts
Keywords: galaxies: active - galaxies: luminosity function, mass function -
radio continuum: galaxies
Abstract:
The work in this paper aims at determining the evolution and possible
co-evolution of radio-loud active galactic nuclei (AGNs) and their
cores via their radio luminosity functions (i.e., total and core RLFs,
respectively). Using a large combined sample of 1063 radio-loud AGNs
selected at low radio frequency, we investigate the RLF (radio
luminosity function) at 408MHz of steep-spectrum radio sources. Our
results support a luminosity-dependent evolution. Using core flux
density data of the complete sample 3CRR (Laing et al., 1983,
Cat. J/MNRAS/204/151; see also Cat. VIII/1), we investigate the core
RLF at 5.0GHz. Based on the combined sample with incomplete core flux
data, we also estimate the core RLF using a modified factor of
completeness. Both results are consistent and show that the comoving
number density of radio cores displays a persistent decline with
redshift, implying a negative density evolution. We find that the core
RLF is obviously different from the total RLF at the 408 MHz band
which is mainly contributed by extended lobes, implying that the cores
and extended lobes could not be co-evolving at radio emission.
Description:
In this paper we construct a coherent sample combined with four
independent complete samples - the 3CRR bright sample (or LRL) Laing
et al. 1983MNRAS.204..151L 1983MNRAS.204..151L; the MRC 1Jy (Large et al. 1981,
Cat. VIII/2, superseded by Cat. VIII/16); the MS4 (Molonglo Southern
4Jy) Burgess & Hunstead (2006, Cat. J/AJ/131/100 and J/AJ/131/114) and
the BRL sample (Best et al. 1999MNRAS.310..223B 1999MNRAS.310..223B) - totaling 1063 sources.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 88 1103 The combined sample
refs.dat 71 66 References
--------------------------------------------------------------------------------
See also:
VIII/34 : Parkes Half-Jansky Flat-Spectrum Sample (Drinkwater + 1997)
VIII/16 : Molonglo Reference Catalog of Radio Sources (Large+ 1991)
VIII/13 : A new catalog of 53522 4.85GHz sources (Becker+ 1991)
VIII/15 : Parkes Radio Sources Catalogue (PKSCAT90) (Wright+ 1990)
VIII/37 : The Third Bologna Survey (B3) (Ficarra+ 1985)
VIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)
VIII/36 : The Second Bologna Survey (Colla+ 1970-1974)
VIII/1 : The 3C and 3CR Catalogues (Edge+ 1959-1962)
J/ApJS/175/314 : VSOP 5GHz AGN survey V. (Dodson+, 2008)
J/AJ/131/114 : The Molonglo Southern 4Jy sample. II (Burgess+, 2006)
J/AJ/131/100 : The Molonglo Southern 4Jy sample. I (Burgess+, 2006)
J/MNRAS/366/1265 : CENSORS infrared imaging (Brookes+, 2006)
J/A+A/407/899 : Core dominance in extragalactic radio sources (Fan+, 2003)
J/A+A/381/757 : List of extra-galactic radio jets (Liu+, 2002)
J/A+A/386/97 : Parkes quarter-Jansky flat-spectrum sample (Jackson+, 2002)
J/ApJS/124/285 : VLA Images of Extragalactic Objects (Reid+, 1999)
J/A+AS/132/31 : Kinematical models for double radio sources (Nilsson 1998)
J/ApJS/107/19 : MRC/1Jy Radio source survey. I. (McCarthy+ 1996)
J/MNRAS/268/602 : Compact radio cores in radio galaxies. (Jones+, 1994)
J/MNRAS/236/207 : Galaxy redshift catalogue (Metcalfe+, 1989)
J/MNRAS/216/173 : Bright extragalactic radio sources at 2.7 GHz (Wall+, 1985)
J/MNRAS/204/151 : Bright radio sources at 178 MHz (3CRR) (Laing+ 1983)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- IAU IAU name (HHMM+DDd; B1950)
10 A1 --- f_IAU [*] * : should be excluded (1)
12- 22 A11 --- OName Other name if available
24- 30 F7.5 --- z ? Spectroscopic redshift
32 A1 --- f_z [e] estimated redshift (2)
34- 40 F7.2 Jy S408 Total flux density at 408MHz (3)
42- 46 F5.2 --- alpha Spectral index α near 408MHz (4)
48 A1 --- l_Score Limit flag on SCore
50- 58 F9.2 mJy Score ? Core flux density at 5GHz
60- 65 F6.3 --- alp.c ? Core spectral index near 5GHz (4)
67- 83 A17 --- Ref Reference(s) (see refs.dat file)
85- 88 A4 --- Set Sub-sample name (5)
--------------------------------------------------------------------------------
Note (1): An asterisk following the source name indicates that the source
should be excluded from the combined sample for the reason explained
in section 2. They are put in the table just for reference. In
summary, we exclude three sources, 3C231, 3C345, 3C454.3, in which
3C231 (M82) is a starburst galaxy, while 3C345 and 3C454.3 actually
have fluxes lower than the flux limit (section 2.1) and sources that
are are flat-spectrum ones with spectral index near 408MHz
α<0.5 (S=ν-α) (section 2.2).
Note (2):
e = Redshift estimated by the empirical relation of R-z or K-z as
mentioned in section 2.2.
Note (3): For the 3CRR sample, these fluxes are from literature or
extrapolated from 178MHz fluxes.
Note (4): Where S=ν-α. Generally, core spectral index
information is far from abundant in literature. Most of our sources
with core fluxes do not have core spectral indices. For these sources,
we simply assume a flat spectrum, SpInd=0, in order to calculate core
luminosities.
Note (5): Sub-sample name as follows:
3CRR = the 3CRR sample (Laing et al., 1983, Cat. J/MNRAS/204/151);
MS4 = the Molonglo southern 4 Jy sample (Burgess & Hunstead, 2006,
Cat. J/AJ/131/100 and J/AJ/131/114);
MRC1 = the MRC 1-Jy sample (Large et al. 1991, Cat. VIII/16);
BRL = the BRL sample (Best et al. 1999MNRAS.310..223B 1999MNRAS.310..223B).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode Bibcode
24- 49 A26 --- Aut Author's name
51- 71 A21 --- Comm Catalog's reference
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Jun-2013