2006MNRAS.373..972G

Query : 2006MNRAS.373..972G

2006MNRAS.373..972G - Mon. Not. R. Astron. Soc., 373, 972-992 (2006/December-2)

Probing radio source environments via Hi and OH absorption.

GUPTA N., SALTER C.J., SAIKIA D.J., GHOSH T. and JEYAKUMAR S.

Abstract (from CDS):

We present the results of Hi and OH absorption measurements towards a sample of radio sources using the Arecibo 305-m telescope and the Giant Metrewave Radio Telescope (GMRT). In total, 27 radio sources were searched for associated 21-cm Hi absorption. One totally new Hi absorption system was detected against the radio galaxy 3C258, while five previously known Hi absorption systems, and one galaxy detected in emission, were studied with improved frequency resolution and/or sensitivity. Our sample included 17 gigahertz peaked spectrum (GPS) and compact steep spectrum (CSS) objects, four of which exhibit Hi absorption. This detection rate of ∼25 per cent compares with a value of ∼40 per cent by Vermeulen et al. for similar sources. We detected neither OH emission nor absorption towards any of the sources that were observed at Arecibo. We are, however, able to estimate a limit on the abundance ratio of N(Hi)/N(OH) ≳ 4x106 for 3C258.

We have combined our results with those from other available Hi searches to compile a heterogeneous sample of 96 radio sources consisting of 27 GPS, 35 CSS, 13 compact flat spectrum (CFS) and 21 large (LRG) sources. The Hi absorption detection rate is highest (∼45 per cent) for the compact GPS sources and least for the LRG sources. We find Hi column density to be anticorrelated with source size, as reported earlier by Pihlström et al., a trend which is consistent with the results of optical spectroscopy. The Hi column density shows no significant dependence on either redshift or luminosity, which are themselves strongly correlated. These results suggest that the environments of radio sources on GPS/CSS scales are similar at different redshifts. Further, in accordance with the unification scheme, the GPS/CSS galaxies have an Hi detection rate of ∼40 per cent which is higher than the detection rate (∼20 per cent) towards the GPS/CSS quasars. Also, the principal (strongest) absorption component detected towards GPS sources appears blueshifted in ∼65 per cent of the cases. This is in agreement with the growing evidence for jet-cloud interactions playing an important role in determining the ionization and kinematical properties of the ambient gas.


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: individual: 3C258 - galaxies: nuclei - quasars: absorption lines - radio lines: galaxies

Simbad objects: 103

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Number of rows : 103
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 QSO B0023-263 BLL 00 25 49.15629900 -26 02 12.6141092   20.30 19.5 18.084   ~ 173 1
2 [VV98] J003150.4-265229 BLL 00 31 50.4963491544 -26 52 24.690911052     19.6     ~ 14 1
3 NVSS J003445+302558 rG 00 34 45.148 +30 25 58.10     19.5     ~ 9 1
4 LEDA 837766 Sy2 00 40 48.2080357896 -20 43 39.682363116   17.4       ~ 27 1
5 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 266 1
6 Z 502-27 rG 01 19 35.00087601 +32 10 50.0619670   16 14.5     ~ 249 1
7 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
8 3C 49 rG 01 41 09.161 +13 53 28.07   22.327 20.920 20.876   ~ 189 1
9 QSO J0157-1043 QSO 01 57 41.6192171016 -10 43 40.965009312   17.32 17.09 17.039   ~ 79 1
10 ICRF J020157.1-113233 Sy1 02 01 57.1794759192 -11 32 33.435766068   16.54 16.40 16.073   ~ 223 1
11 7C 022118.10+273638.00 Sy1 02 24 12.2865158736 +27 50 11.538285648   19.502 18 18.263   ~ 210 1
12 6C 024820+430300 Bla 02 51 34.53674154 +43 15 15.8292024     18.0 13.72   ~ 221 1
13 Anon 0248+43.0 PaG 02 51 35 +43 15.2           ~ 17 1
14 PKS J0255-2153 rG 02 55 39.2471675352 -21 53 51.925499232   17.53       ~ 14 1
15 NGC 1167 LIN 03 01 42.3322774176 +35 12 20.300948892   13.84 12.77     ~ 382 1
16 MCG+06-07-034 rG 03 01 51.4 +35 50 23           ~ 179 1
17 PKS J0347-2900 rG 03 47 00.910 -29 00 46.37           ~ 13 1
18 3C 93.1 BLL 03 48 46.9073426592 +33 53 15.461439576   20.723   19.110   ~ 133 1
19 3C 99.0 Sy2 04 01 07.6007854294 +00 36 32.480076280   20.200 19.010 18.532   ~ 108 1
20 4C 76.03 rG 04 10 45.61079426 +76 56 45.3130641   21 22.0 21.200   ~ 164 1
21 PKS 0428+205 rG 04 31 03.76141386 +20 37 34.2648470   22.174   19.085   ~ 198 1
22 ICRF J050321.1+020304 Sy2 05 03 21.19716454 +02 03 04.6765714   22.500 21.350 20.682   ~ 196 1
23 [VV98] J051351.9+015655 QSO 05 13 52.4730368784 +01 57 10.327959072     16.5     ~ 18 2
24 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 910 1
25 ESO 362-21 BLL 05 22 57.98464178 -36 27 30.8512953   15.26 14.62 14.48   ~ 873 2
26 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
27 ICRF J055652.6-024105 Sy2 05 56 52.62300614 -02 41 05.5163562   20.968   19.533   ~ 36 1
28 2C 524 Sy2 06 09 32.701768 +48 04 17.04207   21.198 18.00 18.767   ~ 182 1
29 QSO B0625-354 BLL 06 27 06.7286533392 -35 29 15.363665088   14.93       ~ 206 1
30 ICRF J064524.0+212151 Sy2 06 45 24.09954730 +21 21 51.2008841   19.5       ~ 139 1
31 QSO B0723-007 BLL 07 25 50.63991258 -00 54 56.5430511   17.39 16.57 15.82   ~ 284 1
32 6C 073759+311929 Bla 07 41 10.70330407 +31 12 00.2291151   17.02 16.89 16.322   ~ 468 1
33 2XMM J080535.0+240951 Sy2 08 05 35.0054956728 +24 09 50.330022516   15.46       ~ 336 1
34 3C 196.1 Sy2 08 15 27.825 -03 08 27.67   18.490 16.940 16.797   ~ 124 1
35 4C 06.30 rG 08 22 31.9510001544 +05 57 06.787089972   18.04 17.33     ~ 133 1
36 4C 55.16 Bla 08 34 54.90398776 +55 34 21.0703409   20.75 19.45 17.180   ~ 297 2
37 7C 085805.20+291331.00 Sy2 09 01 05.2614565176 +29 01 46.939089828   18.84 18.08 18.600   ~ 132 1
38 3C 216.0 Bla 09 09 33.49714902 +42 53 46.4821036   19.98 19.42 18.220   ~ 520 1
39 4C 39.25 Bla 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 1036 1
40 3C 220.3 rG 09 39 23.43 +83 15 26.2   20.5   20.140   ~ 98 1
41 ICRF J094336.9-081930 LIN 09 43 36.94453828 -08 19 30.8202783   19.401   18.100   ~ 125 2
42 NVSS J095447+743556 rG 09 54 47.44288561 +74 35 57.1450956       21.700   ~ 41 1
43 3C 236.0 BLL 10 06 01.75023017 +34 54 10.4016113   15.97       ~ 473 2
44 ICRF J103507.0+562846 Sy2 10 35 07.03998083 +56 28 46.7956247   20.2 21.244 20.200   ~ 205 1
45 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
46 ICRF J112027.8+142054 Sy2 11 20 27.80814059 +14 20 54.9730732   20 20.935 20.100   ~ 175 1
47 3C 258 rG 11 24 43.69438 +19 19 28.1428   22.082 21.448 20.513   ~ 86 2
48 NGC 3894 Bla 11 48 50.35817663 +59 24 56.3822416   12.9   11.57   ~ 268 1
49 Ton 599 Bla 11 59 31.83391383 +29 14 43.8268224   14.80 14.41 17.652 13.39 ~ 989 1
50 3C 268.3 Sy2 12 06 24.70656 +64 13 36.8760 22.74 21.847 20.790 19.910   ~ 196 1
51 NGC 4278 LIN 12 20 06.8242 +29 16 50.722 11.54 11.09 10.16     ~ 988 2
52 2E 2879 Sy1 12 52 26.3561235816 +56 34 19.573734864   18.42 18.11 17.660   ~ 293 2
53 PKS 1306-09 rG 13 08 39.1573432224 -09 50 32.424542340   20.767 20.500 18.439   ~ 81 1
54 ICRF J131337.8+545823 Sy2 13 13 37.85315129 +54 58 23.8999370     21.735 20.374   ~ 39 1
55 NGC 5090 rG 13 21 12.84471811 -43 42 16.8452073   12.59 11.51 10.84   ~ 208 1
56 4C 32.44 QSO 13 26 16.5142 +31 54 09.522   21.367 19.822 18.882   ~ 181 1
57 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
58 PKS 1345+12 Sy2 13 47 33.36161873 +12 17 24.2398927   19.28 18.44 15.718   ~ 652 2
59 NGC 5363 rG 13 56 07.24367 +05 15 16.9200 12.59 12.12 10.51     ~ 235 1
60 NVSS J135740+435400 rG 13 57 40.5870 +43 53 59.772     22.708 20.951   ~ 50 1
61 ICRF J140028.6+621038 Sy2 14 00 28.64823540 +62 10 38.5885744   22.137 20.373 19.530   ~ 187 1
62 Mrk 668 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 826 3
63 IC 4374 Bla 14 07 29.76229070 -27 01 04.2916695   13.61   11.79 12.55 ~ 142 3
64 QSO B1413+135 BLL 14 15 58.81751033 +13 20 23.7128587   21.055 20.000 18.461   ~ 476 1
65 3C 299 rG 14 21 05.6960 +41 44 49.260   20.496 19.330 18.560   ~ 187 1
66 8C 1443+773 Sy2 14 43 14.5707907691 +77 07 27.607161183   19   18.730   ~ 152 1
67 Z 21-63 BLL 15 16 40.21905672 +00 15 01.9090936   17.28 16.64 10.53   ~ 217 1
68 4C 04.51 rG 15 21 14.41846935 +04 30 21.6366133   18.2       ~ 103 1
69 4C 14.60 BLL 15 40 49.49151924 +14 47 45.8846989   17.72 17.30 17.240   ~ 448 1
70 ICRF J154609.5+002624 Bla 15 46 09.53146317 +00 26 24.6145149   19.730 18.900 19.5   ~ 91 1
71 QSO B1549-790 Bla 15 56 58.86979525 -79 14 04.2817241   18.80 18.800 17.84   ~ 221 1
72 PKS 1601-222 rG 16 04 01.47174802 -22 23 40.9881985   21.0       ~ 40 1
73 4C 69.21 Bla 16 42 07.84851261 +68 56 39.7563611   19.723   19.219   ~ 326 1
74 3C 346.0 BLL 16 43 48.605 +17 15 49.43   17.2       ~ 270 1
75 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
76 QSO J1658+0741 Bla 16 58 09.01146680 +07 41 27.5404484   19.993 20.00 19.598   ~ 182 1
77 4C -00.67 Sy2 17 20 28.1680537512 -00 58 46.582453920   15.36       ~ 345 1
78 7C 1815+6125 BLL 18 15 36.79225624 +61 27 11.6475505   21.272   19.122   ~ 44 1
79 ICRF J181623.9+345745 Sy2 18 16 23.90102409 +34 57 45.7493697   20.342   18.459   ~ 34 1
80 QSO B1814-637 Bla 18 19 35.00241 -63 45 48.1926   16.80 14.40 13.4   ~ 154 1
81 4C 39.56 Sy1 18 21 20.8979332560 +39 42 44.862056676   19.598   18.135   ~ 67 1
82 QSO B1826+796 Bla 18 23 14.10855195 +79 38 49.0018505   19.269 16.70 17.415   ~ 74 1
83 2C 1569 Bla 18 29 31.7809732968 +48 44 46.160168892   17.05 16.81 16.860   ~ 713 1
84 ICRF J183114.8+290710 Sy2 18 31 14.85954059 +29 07 10.2942036   21.917 20.2 20.200   ~ 78 1
85 NVSS J184535+354116 rG 18 45 35.10883099 +35 41 16.7264948   19.830   21.900   ~ 68 0
86 ICRF J194431.5+544807 BLL 19 44 31.51155734 +54 48 07.0622434   21.732   18.591   ~ 80 1
87 QSO B1946+708 BLL 19 45 53.51966298 +70 55 48.7285673   18.726 16.70 17.199   ~ 147 2
88 QSO B2021+614 Bla 20 22 06.68174620 +61 36 58.8047323     19.00 17.58   ~ 335 1
89 ICRF J205252.0+363535 Sy2 20 52 52.05501061 +36 35 35.3005698   22.083   21.200   ~ 112 2
90 4C 05.78 rG 20 58 26 +05 40.7           ~ 14 0
91 ICRF J213750.0-204231 Sy1 21 37 50.00785656 -20 42 31.6728477   20.400 19.4 19.286   ~ 102 1
92 QSO B2149+056 Bla 21 51 37.87549026 +05 52 12.9545152   23.700 22.050 20.850   ~ 120 1
93 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1
94 2dFGRS TGS005Z206 Sy2 22 09 20.1637016208 -23 31 53.883877692   17.0   15.983   ~ 48 1
95 2MASX J22502534+1419519 Sy1 22 50 25.3475290512 +14 19 52.095751140   17.28 16.97 17.243   ~ 210 1
96 3C 455.0 QSO 22 55 03.8909253126 +13 13 33.940584742   19.535 19.590 19.190   ~ 197 1
97 IC 1459 rG 22 57 10.60682195 -36 27 43.9966421   10.96 11.85 9.34 10.3 ~ 652 2
98 ICRF J231635.1+040518 Sy2 23 16 35.1933566880 +04 05 18.297101076   17.54 16.68 17.220   ~ 309 1
99 3C 460 Sy2 23 21 28.50264 +23 46 47.6400   20.315   18.468   ~ 90 1
100 6C 232316+433021 Sy2 23 25 42.2873689152 +43 46 58.689756804   18.0 18.0     ~ 39 1
101 ICRF J233355.2-234340 BLL 23 33 55.2379642584 -23 43 40.660470084   16.45 17 11.21   ~ 185 1
102 ICRF J234403.7+822640 Sy2 23 44 03.8302221504 +82 26 40.345410408   21.769 20.5 20.220   ~ 104 1
103 6C 235239+493337 BLL 23 55 09.45814429 +49 50 08.3394994   21.101   18.400   ~ 284 1

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