J/ApJ/473/713 Host galaxies of powerful radio sources (Zirbel+, 1996)
Properties of host galaxies of powerful radio sources.
Zirbel E.L.
<Astrophys. J., 473, 713-732 (1996)>
=1996ApJ...473..713Z 1996ApJ...473..713Z
ADC_Keywords: Radio sources ; Active gal. nuclei ; Galaxies, radio
Keywords: Galaxies: Evolution; Galaxies: Photometry; Galaxies: Structure
Radio Continuum: Galaxies
Abstract:
This paper describes those properties of the host galaxies of powerful
radio sources that are unique to radio galaxies. The radio galaxies
have redshifts up to z=0.5 and radio powers, P(408MHz), ranging from
1025 to 1028W.Hz-1 (H0=50km.s-1.Mpc-1 and q0=0). We find
that the magnitudes, colors, and surface brightness profiles of these
radio galaxies are very diverse. Their rest frame V magnitudes range
from -24th to -20th magnitude and are 0.55±0.06mag fainter than
those of brightest cluster members. Their (B-V) colors can be as red
as those of brightest cluster members but may also be ∼1 mag bluer.
The optical structure of the low-redshift (0.03<z<0.25) radio galaxies
may vary ranging from cD to N galaxy behaviour. Although the host
galaxies of the low-redshift radio sources are generally
"elliptical-like" galaxies, a comparison of the overall structure of
radio galaxies to those of radio- quiet "generalized elliptical
galaxies" of Schombert shows that only 17% are genuine elliptical
galaxies, 9% have elliptical profiles with truncated halos, 26% are
roughly elliptical but have disturbed surface brightness profiles, 16%
are cD or D galaxies, 7% have double nuclei, and 21% are N galaxies.
The only property that radio galaxies, as a class, have in common is
that their sizes are relatively larger than those of normal elliptical
galaxies of the same absolute magnitude. At the 22d isophote (in V)
radio galaxies are 11% larger, at the 24th isophote they are 15%
larger, and at the 25th isophote they are 20% larger. The host
galaxies of the low-redshift (0.03<z<0.25) FR I and FR II sources have
different properties. 69% of all FR I's are associated with cD-like or
double nucleus galaxies, 19% with smooth ellipticals, and 13% with
disturbed ellipticals; no FR I's are associated with N galaxies. 41%
of all FR IIs are associated with N galaxies, 26% with smooth
ellipticals, and 26% with disturbed ellipticals; no FR II's are
associated with cD-like galaxies. The colors and color gradients are
also different, with the FR II's having both bluer colors and a larger
dispersion in their color gradients. Powerful FR I and FR II sources
exhibit differing cosmological evolutions in their number counts. At
low redshifts, almost all powerful sources are FR I's, and at high
redshifts they are predominantly FR II's. We suggest that powerful FR
I's prefer host galaxies that are the dominant central galaxies of
relaxed groups and clusters, while FR II's are most often associated
with violent galaxy encounters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 89 72 Low-redshift data
table7.dat 45 34 High-redshift data (2 lines removed, see the
"Note (1)" below)
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See also:
J/ApJ/448/521 : Radio powers in radio galaxies (Zirbel+, 1995)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Galaxy name (1)
14- 18 F5.3 --- z [0.03/0.22] Redshift
20- 24 F5.2 [W/Hz] logP ? Logarithm of radio power at 408MHz
26- 31 F6.2 mag V16 ? 16 kpc aperture absolute V-band magnitude
33- 38 F6.2 mag V87 ? 87 kpc aperture absolute V-band magnitude
40- 44 F5.2 mag D(B-V) ? color difference Δ(B-V) to locus of
E/S0 galaxies
46- 50 F5.2 mag/arcsec2 Se Surface brightness at the effective radius
52- 56 F5.2 [arcsec] log(re) ? logarithm of effective radius
58- 61 F4.2 [arcsec] log(r22) ? logarithm of 22d isophotal radius
63- 66 F4.2 [arcsec] log(r24) ? logarithm of 24th isophotal radius
68- 71 F4.2 [arcsec] log(r25) ? logarithm of 25th isophotal radius
73- 77 F5.1 --- Rich ? background-corrected group richness (G1)
79- 81 F3.1 --- e_Rich ? Mean error on Rich
83- 85 A3 --- Type Structural classification (G2)
87- 89 A3 --- FR Fanaroff-Riley class.
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Note (1): Galaxy names corrected at CDS:
4C-03.72 = printed as 4C 03.72;
4C 23.01 = printed as 4C 23.00;
PKS 0043-424 = printed as PKS 0043-014;
PKS 0114-476 = printed as PKS 0114-467;
PKS 0429-171 = printed as PKS 0429-278;
PKS 1331-098 = printed as PKS 1331-009
PKS 1214+038 = most likely a duplicate with PKS 1215+039
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Galaxy name (1)
14- 18 F5.3 --- z [0.27/0.5] Redshift,
20- 24 F5.2 [W/Hz] logP ? Logarithm of radio power at 408MHz
26- 31 F6.2 mag V87 ? Extinction-corrected absolute magnitude
34- 37 F4.1 --- Rich Background-corrected group richness (G1)
39- 41 F3.1 --- e_Rich Mean error on Rich
43- 45 A3 --- FR Fanaroff-Riley class
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Note (1): The galaxy names were completed at CDS (the original names
contained only the RA part of the B2 names), using the Allington-Smith
et al. (1993ApJ...404..521A 1993ApJ...404..521A) table2. 2 lines were dropped in the
electronic version of this table (lines 8 and 9 with names "2152"
and "2159")
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Global Notes:
Note (G1): richness defined as the number of galaxies brighter than -19th
magnitude that lie within 0.5Mpc of the radio galaxy.
Note (G2): Structural classes are as follows:
E = elliptical
cD = cD-like
db = double-nucleus galaxy
N = N galaxy
dE = disturbed elliptical
S0? = elliptical with truncated halo
C = contaminated
W = weird
History:
Prepared via OCR by Heinz Andernach (catalog A2160 in his collection)
(End) Heinz Andernach [Guanajuato Univ.], Francois Ochsenbein [CDS] 12-Jun-2014