2002MNRAS.337.1407I

Query : 2002MNRAS.337.1407I

2002MNRAS.337.1407I - Mon. Not. R. Astron. Soc., 337, 1407-1416 (2002/December-3)

Deep spectroscopy of z ∼ 1 6C radio galaxies - II. Breaking the redshift-radio power degeneracy.

INSKIP K.J., BEST P.N., ROETTGERING H.J.A., RAWLINGS S., COTTER G. and LONGAIR M.S.

Abstract (from CDS):

The results of a spectroscopic analysis of 3CR and 6C radio galaxies at redshift z ∼ 1 are contrasted with the properties of lower-redshift radio galaxies, chosen to be matched in radio luminosity to the 6C sources studied at z ∼ 1, thus enabling the redshift-radio power degeneracy to be broken. Partial rank correlations and principal component analysis have been used to determine which of redshift and radio power are the critical parameters underlying the observed variation of the ionization state and kinematics of the emission-line gas.

[Oii]/Hβ is shown to be a useful ionization mechanism diagnostic. Statistical analysis of the data shows that the ionization state of the emission-line gas is strongly correlated with radio power, once the effects of other parameters are removed. No dependence of ionization state on cosmic epoch is observed, implying that the ionization state of the emission-line gas is solely a function of the properties of the active galactic nucleus rather than the host galaxy and/or environment.

Statistical analysis of the kinematic properties of the emission-line gas shows that these are strongly correlated independently with both redshift and radio power. The correlation with redshift is the stronger of the two, suggesting that host-galaxy composition or environment may play a role in producing the less extreme gas kinematics observed in the emission-line regions of low-redshift galaxies.

For both the ionization and kinematic properties of the galaxies, the independent correlations observed with radio size are stronger than with either radio power or redshift. Radio source age is clearly a determining factor for the kinematics and ionization state of the extended emission-line regions.


Abstract Copyright: RAS

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: ISM - radio continuum: galaxies

Simbad objects: 36

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Number of rows : 36
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 QSO B0023-263 BLL 00 25 49.15629900 -26 02 12.6141092   20.30 19.5 18.084   ~ 162 1
2 LEDA 2822314 Sy2 00 42 09.0274 -44 13 59.896     19.5 18.700   ~ 61 1
3 3C 22.0 Sy1 00 50 56.3 +51 12 03   22.0       ~ 151 0
4 3C 79.0 Sy2 03 10 00.0936589848 +17 05 58.599361932   19.54 18.75     ~ 258 3
5 3C 169.1 rG 06 51 15.30 +45 09 26.0   20.5       ~ 63 1
6 3XMM J090147.2-255516 QSO 09 01 47.2602 -25 55 16.021   18.5       ~ 68 1
7 3C 217 Rad 09 08 50.6 +37 48 19   22       ~ 128 1
8 3C 226.0 Sy1 09 44 16.51944 +09 46 16.9068   19.5       ~ 130 2
9 NVSS J094618+394418 rG 09 46 18.6 +39 44 19           ~ 32 1
10 NVSS J101412+361727 rG 10 14 12.9 +36 17 25   21.5       ~ 32 1
11 4C 37.27A rG 10 20 39.7 +36 56 59           ~ 38 1
12 4C 39.31 rG 10 22 55.2 +39 08 49   22.7       ~ 44 1
13 3C 247 QSO 10 58 58.8 +43 01 23   21.5       ~ 160 1
14 3C 252.0 G 11 11 32.0 +35 40 45   22       ~ 127 1
15 4C 37.31 rG 11 32 35.9 +36 54 12   23       ~ 40 1
16 3C 265.0 Sy1 11 45 29.0 +31 33 50   20.0       ~ 248 0
17 2C 1066 SyG 12 56 57.5 +47 20 20   22.0       ~ 282 0
18 NVSS J125905+363158 rG 12 59 05.9 +36 31 57           ~ 32 1
19 NVSS J125929+361704 rG 12 59 30.00936 +36 17 02.6304           ~ 29 1
20 PKS 1306-09 rG 13 08 39.1573432224 -09 50 32.424542340   20.767 20.500 18.439   ~ 77 1
21 3C 289 QSO 13 45 26.699 +49 46 31.39   23       ~ 161 1
22 3C 299 rG 14 21 05.6960 +41 44 49.260   20.496 19.330 18.560   ~ 186 1
23 3C 300 SyG 14 22 59.85648 +19 35 36.7152   19.66 18.73     ~ 198 2
24 3C 306.1 rG 14 55 01.4 -04 20 23   19       ~ 67 1
25 3C 324.0 Sy1 15 49 49.2 +21 25 39   21.5       ~ 310 0
26 3C 337 QSO 16 28 53.9 +44 19 03   20.0       ~ 148 1
27 3C 340 rG 16 29 37.8 +23 20 14   22       ~ 126 1
28 3C 352 rG 17 10 44.1001 +46 01 29.834   22.8       ~ 150 1
29 3C 356 QSO 17 24 20.2 +50 57 14   21.5 21.5     ~ 225 1
30 3C 368.0 rG 18 05 06.4 +11 01 33   21.5       ~ 250 1
31 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1231 1
32 3C 435 G 21 29 06.1 +07 32 59   21       ~ 68 2
33 LEDA 2831507 Sy2 22 53 03.268 -40 57 51.44     20.0     ~ 107 1
34 3C 458 rG 23 12 54.5 +05 16 24   20       ~ 93 1
35 ICRF J231635.1+040518 Sy2 23 16 35.1933566880 +04 05 18.297101076   17.54 16.68 17.220   ~ 295 1
36 LEDA 73132 Sy2 23 59 04.31090 -60 54 59.2180   16.61       ~ 141 1

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