2003ApJ...585...90Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST15:23:05

2003ApJ...585...90Z - Astrophys. J., 585, 90-111 (2003/March-1)

Massive elliptical galaxies at high redshift: NICMOS imaging of z~1 radio galaxies.

ZIRM A.W., DICKINSON M. and DEY A.

Abstract (from CDS):

We present deep, ~1.6 µm, continuum images of 11 high-redshift (0.811<z<1.875) 3CR radio galaxies observed with NICMOS on board the Hubble Space Telescope. Our NICMOS images probe the rest-frame optical light where stars are expected to dominate the galaxy luminosity. The rest-frame ultraviolet light of eight of these galaxies demonstrates the well-known ``alignment effect'', with extended and often complex morphologies elongated along an axis close to that of the Fanaroff-Riley type II (FRII) radio source. As has been previously noted from ground-based near-infrared imaging, most of the radio galaxies have rounder, more symmetric morphologies at rest-frame optical wavelengths. Here we show the most direct evidence that in most cases the stellar hosts are normal elliptical galaxies with r1/4-law light profiles. For a few galaxies, very faint traces (less than 4% of the total H-band light) of the UV-bright aligned component are also visible in the infrared images. We derive both the effective radius and surface brightness for nine of 11 sample galaxies by fitting one- and two-dimensional surface-brightness models to them. We compare the high-redshift radio galaxies to lower redshift counterparts. We find that their sizes are similar to those of local FRII radio source hosts and are in general larger than other local galaxies. The derived host galaxy luminosities are very high and lie at the bright end of luminosity functions constructed at similar redshifts. This indicates that the high-redshift radio galaxies are likely rare, massive sources. The galaxies in our sample are also brighter than the rest-frame size-surface-brightness locus defined by the low-redshift sources. Passive evolution roughly aligns the z~1 galaxies with the low-redshift samples with a slope equal to 4.7. This value is intermediate between the canonical Kormendy relation (~3.5) and a constant luminosity line (=5). The optical host is sometimes centered on a local minimum in the rest-frame UV emission, suggesting the presence of substantial dust obscuration. We also see good evidence of nuclear point sources (no brighter than 5% of the total H-band light) in three galaxies. Overall, our results are consistent with the hypothesis that these galaxies have already formed the bulk of their stars at redshifts greater than z~2 and that the active galactic nucleus phenomenon takes place within otherwise normal, perhaps passively evolving, galaxies.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Elliptical and Lenticular, cD - Galaxies: High-Redshift - Infrared: Galaxies

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 35 QSO 01 12 02.216 +49 28 35.24     15.6     ~ 137 0
2 3C 63 BLL 02 20 54.3 -01 56 51   18.5       ~ 137 0
3 3C 65 rG 02 23 43.10 +40 00 52.0   23.0       ~ 174 1
4 3C 79.0 Sy2 03 10 00.0932580214 +17 05 58.593728115   19.54 18.75     ~ 242 3
5 3CR 93.1 Sy2 03 48 46.9076031514 +33 53 15.460411800   20.723   19.110   ~ 124 1
6 3C 184 rG 07 39 24.40 +70 23 10.0   21.5       ~ 132 1
7 3C 210 rG 08 58 10.0 +27 50 55   22       ~ 95 0
8 3C 219 Sy1 09 21 08.6263828902 +45 38 57.345842278   19.56 18.69     ~ 385 2
9 7C 095855.89+290131.00 Sy1 10 01 49.5226070599 +28 47 08.913353395   18.21 17.27     ~ 396 1
10 3C 239 rG 10 11 45.6 +46 28 20   22.5       ~ 144 1
11 3C 256 rG 11 20 43.022 +23 27 55.21   21.5       ~ 118 0
12 3C 265.0 Sy1 11 45 29.0 +31 33 50   20.0       ~ 237 0
13 3C 266 rG 11 45 43.4 +49 46 08   22       ~ 137 1
14 3C 267 rG 11 49 56.5 +12 47 19   22.5       ~ 146 2
15 2C 1066 SyG 12 56 57.9 +47 20 20   22.0       ~ 268 0
16 VV 204 AGN 15 04 57.120 +26 00 58.46   15.24       ~ 274 0
17 3C 314.1 rG 15 10 23.1 +70 45 54   17       ~ 89 0
18 3C 319.0 rG 15 24 05.60 +54 28 18.4   18.5       ~ 143 1
19 7C 161547.29+322956.00 Sy1 16 17 42.5379079793 +32 22 34.373288602   18.25 17.45     ~ 230 1
20 2MASX J16434862+1715489 Sy2 16 43 48.605 +17 15 49.43   17.2       ~ 246 0
21 3C 368.0 rG 18 05 06.30 +11 01 32.0   21.5       ~ 241 1
22 2MASX J18334627+4727027 Sy1 18 33 46.2946109378 +47 27 02.568353862   18.64 17.24     ~ 194 1
23 3C 403.0 Sy2 19 52 15.7997953344 +02 30 24.235518851   15.42 16.5     ~ 294 1
24 3C 436 AGN 21 44 11.720 +28 10 18.86   18.5       ~ 174 1
25 3C 452 Sy2 22 45 48.787 +39 41 15.36   17.60 16.56     ~ 338 1
26 3C 470.0 rG 23 58 35.30 +44 04 38.0   22.5       ~ 106 1

    Equat.    Gal    SGal    Ecl

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2020.07.12-15:23:05

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