2004MNRAS.351.1109W

Query : 2004MNRAS.351.1109W

2004MNRAS.351.1109W - Mon. Not. R. Astron. Soc., 351, 1109-1119 (2004/July-1)

HI in the protocluster environment at z > 2: absorbing haloes and the Lyα forest.

WILMAN R.J., JARVIS M.J., ROETTGERING H.J.A. and BINETTE L.

Abstract (from CDS):

We present VLT-UVES echelle spectra of the Lyα emission and absorption in five radio galaxies at redshifts z = 2.55-4.1. Together with data from our pilot study, we have a sample of seven such systems with radio source sizes ∼1-90 kpc with which to address the origin of the absorbing gas. Echelle resolution again reveals that some systems with NHi> 1018/cm2 in lower-resolution data in fact consist of several weaker absorbers with NHi< 1015/cm2. We identify two groups of Hi absorbers: strong absorbers with NHi≃ 1018-1020/cm2 and weaker systems with NHi≃ 1013-1015/cm2. There is none at intermediate NHi.

The strong absorbers may be a byproduct of massive galaxy formation or could instead represent material cooling behind the expanding bow shock of the radio jet, as simulated by Krause. New observations are required to discriminate between these possibilities. We argue that the weaker absorbers with NHi≃ 1013-1015/cm2 are part of the Lyα forest, as their rate of incidence is within a factor of 2-4 of that in the intergalactic medium at large. Such column densities are consistent with models of a multiphase proto-intracluster medium at z > 2.


Abstract Copyright: 2004 RAS

Journal keyword(s): galaxies: active - galaxies: haloes - galaxies: high-redshift - quasars: absorption lines - quasars: emission lines

CDS comments: The objects 0943-242, 0200+15, 1545-234 and 2202+128 are [RLM94] in simbad, 0121+1320 is [DVR2000] TN J0121+1320 in simbad, 1338-1942 is [DVR2000] TN J 1338-1942, 1755-6916 is [DVR2000] MP 1755-6916 in simbad.

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NVSS J012142+132058 rG 01 21 42.695 +13 20 58.10           ~ 43 1
2 NVSS J020242+014910 rG 02 02 43.0 +01 49 09           ~ 35 1
3 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
4 NVSS J090530+340756 rG 09 05 30.101 +34 07 56.90   24.0 23.800 23.500   ~ 163 1
5 PMN J0945-2429 rG 09 45 32.6 -24 28 50           ~ 101 1
6 PKS J1140-2628 rG 11 40 48.35884 -26 29 08.6316     22.00     ~ 325 1
7 [DBC2004] M03 rG 13 38 26.05 -19 42 30.5       22.4   ~ 106 0
8 NAME MS 1512-cB58 AGN 15 14 22.2751 +36 36 25.674     20.64   20.35 ~ 326 0
9 FIRST J151422.4+363620 rG 15 14 22.482 +36 36 21.08           ~ 146 1
10 NVSS J154817-233701 rG 15 48 17.5 -23 37 05           ~ 21 1
11 PMN J1755-6916 rG 17 55 30.51 -69 16 50.4           ~ 13 1
12 NVSS J220514+130533 rG 22 05 14.365 +13 05 32.52           ~ 24 1
13 NAME SMM J221726+0013 EmO 22 17 25.97 +00 12 38.9   27   24.49   ~ 112 0
14 NVSS J233024+392711 rG 23 30 24.94 +39 27 12.0   24.70 23.97     ~ 56 2

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