2018MNRAS.481.1578A

Query : 2018MNRAS.481.1578A

2018MNRAS.481.1578A - Mon. Not. R. Astron. Soc., 481, 1578-1596 (2018/December-1)

A Giant Metrewave Radio Telescope survey for associated H I 21 cm absorption in the Caltech-Jodrell flat-spectrum sample.

ADITYA J.N.H.S. and KANEKAR N.

Abstract (from CDS):

We report a Giant Metrewave Radio Telescope survey for associated H I 21-cm absorption from 50 active galactic nuclei (AGNs), at z ≃ 0.04-3.01, selected from the Caltech-Jodrell Bank flat-spectrum (CJF) sample. Clean spectra were obtained towards 40 sources, yielding two new absorption detections, at z = 0.229 towards TXS 0003+380 and z = 0.333 towards TXS 1456+375, besides confirming an earlier detection, at z = 1.277 towards TXS 1543+480. There are 92 CJF sources, at 0.01 <= z <= 3.6, with searches for associated H I 21-cm absorption, by far the largest uniformly selected AGN sample with searches for such absorption. We find weak (≃2σ) evidence for a lower detection rate of H I 21-cm absorption at high redshifts, with detection rates of 28+10–8 per cent and 7+6–4 per cent in the low-z (z < zmed) and high-z (z > zmed) sub-samples, respectively. We use two-sample tests to find that the strength of the H I 21-cm absorption in the AGNs of our sample depends on both redshift and AGN luminosity, with a lower detection rate and weaker absorption at high redshifts and high ultraviolet/radio AGN luminosities. Unfortunately, the luminosity bias in our sample, with high-luminosity AGNs arising at high redshifts, implies that it is not currently possible to identify whether redshift evolution or AGN luminosity is the primary cause of the weaker absorption in high-z, high-luminosity AGNs. We find that the strength of H I 21-cm absorption does not depend on AGN colour, suggesting that dust extinction is not the main cause of reddening in the CJF sample.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

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

Simbad objects: 115

goto Full paper

goto View the references in ADS

Number of rows : 115
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 B0003+380 Bla 00 05 57.17538691 +38 20 15.1489639   19.4 18.10 17.16   ~ 142 1
2 ICRF J001331.1+405137 Sy1 00 13 31.13019909 +40 51 37.1441374   17.9 17.9     ~ 115 1
3 4C 36.01 BLL 00 37 46.14300659 +36 59 10.8830941     18.0     ~ 45 1
4 5C 3.50 QSO 00 38 24.84358446 +41 37 06.0002701   19.9 19.9 18.95   ~ 134 1
5 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 254 1
6 6C 011029+493221 QSO 01 13 27.00680467 +49 48 24.0432101   18.4 18.4 17.80   ~ 114 1
7 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2815 2
8 QSO J0148+3854 Bla 01 48 24.3774427968 +38 54 05.220477000     16.5 17.59   ~ 58 1
9 6C 024820+430300 QSO 02 51 34.53674154 +43 15 15.8292024     18.0 13.72   ~ 213 1
10 4C 38.08A QSO 02 53 08.88807241 +38 35 24.9990527   18.3       ~ 47 1
11 ICRF J025442.6+393134 Sy1 02 54 42.6319794672 +39 31 34.711675284     16.30 16.91   ~ 65 1
12 ICRF J031301.9+412001 Sy1 03 13 01.96212044 +41 20 01.1834497   18.0   14.59   ~ 166 0
13 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4008 3
14 6C 034014+361233 QSO 03 43 28.95241581 +36 22 12.4297151     20.80 19.78   ~ 77 1
15 4C 40.12 rG 03 47 59.9844437256 +40 43 58.922553756   16.5       ~ 24 1
16 ICRF J040549.2+380332 SyG 04 05 49.26287155 +38 03 32.2348497   18.5 18.5     ~ 157 3
17 6C 042408+670358 QSO 04 29 06.02519959 +67 10 16.5340956           ~ 19 1
18 QSO B0454+844 BLL 05 08 42.36351222 +84 32 04.5441733     16.5 18.95   ~ 242 1
19 6C 053713+531053 QSO 05 41 16.17409482 +53 12 24.8345549   18.0 18.0 18.28   ~ 52 1
20 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1493 1
21 3C 151 QSO 06 04 35.62879242 +44 13 58.5481902           ~ 50 1
22 4C 72.10 QSO 06 10 48.87326745 +72 48 53.1837769           ~ 31 1
23 7C 062051.50+385829.00 QSO 06 24 19.02128805 +38 56 48.7360344   20.0 20.0 19.24   ~ 78 1
24 QSO B0636+68 BLL 06 42 04.2572705040 +67 58 35.620484340     16.46 16.01   ~ 226 1
25 7C 064126.60+391755.00 QSO 06 44 53.70959953 +39 14 47.5339198     20.30 19.47   ~ 50 1
26 7C 064253.00+445430.00 QSO 06 46 32.02599653 +44 51 16.5901185   19.57 18.49 18.64   ~ 348 1
27 ICRF J065510.0+410010 QSO 06 55 10.02472583 +41 00 10.1602339   14.6   9.37   ~ 66 1
28 4C 47.23 BLL 07 10 46.10488160 +47 32 11.1426490   18.2 18.2 13.9   ~ 153 1
29 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1301 1
30 7C 073311.80+594748.00 Bla 07 37 30.08694371 +59 41 03.1947899   15.5   11.8   ~ 62 1
31 4C 54.15 BLL 07 53 01.38457270 +53 52 59.6370830   18.5   16.77   ~ 155 1
32 QSO J0753+4231 QSO 07 53 03.3374580696 +42 31 30.765827964   19.16 18.43     ~ 84 1
33 6C 080047+615309 Bla 08 05 18.17956222 +61 44 23.7005580       19.64   ~ 134 1
34 NVSS J080754+494628 Rad 08 07 55.0 +49 46 31           ~ 6 1
35 7C 080533.60+410130.00 Bla 08 08 56.65204477 +40 52 44.8888932   19.87 19.41 16.61   ~ 131 1
36 4C 56.16A Bla 08 24 47.23636459 +55 52 42.6693589   18.52 18.19 17.82   ~ 198 1
37 4C 39.23A Bla 08 24 55.48385834 +39 16 41.9040476   18.55 18.21 17.20   ~ 213 1
38 ICRF J083454.9+553421 Sy2 08 34 54.90398776 +55 34 21.0703409   20.75 19.45 17.180   ~ 282 2
39 US 1316 QSO 08 36 36.8926475064 +41 25 54.711763536   17.78 17.57 17.6   ~ 72 1
40 4C 58.17 QSO 08 54 41.99641612 +57 57 29.9391251   18.56 18.18 17.43   ~ 238 1
41 6C 085940+470301 QSO 09 03 03.99010563 +46 51 04.1374172   19.90 19.44 18.7   ~ 265 1
42 QSO J0903+6757 QSO 09 03 53.15503767 +67 57 22.6856697   19.5   18.32   ~ 51 1
43 6C 091739+622838 QSO 09 21 36.23107643 +62 15 52.1803510   19.76 19.26 18.96   ~ 364 1
44 ICRF J092703.0+390220 Sy1 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 1001 1
45 6C 092554+502611 BLL 09 29 15.4401569832 +50 13 35.990913000   17.18 16.80 15.94   ~ 143 2
46 4C 40.24 QSO 09 48 55.33815103 +40 39 44.5869471   18.31 18.02 17.85   ~ 351 1
47 NVSS J095447+743556 rG 09 54 47.44288561 +74 35 57.1450956       21.700   ~ 38 1
48 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 711 1
49 8C 1003+830 BLL 10 10 15.78300886 +82 50 14.3838898     18.30 17.61   ~ 56 1
50 7C 1010+3500 Bla 10 13 49.61404321 +34 45 50.7834679   19.32 18.95 19.30   ~ 106 1
51 7C 1015+3557 Bla 10 18 10.98810472 +35 42 39.4409041   18.62 18.07 17.65   ~ 187 1
52 4C 40.25 Bla 10 23 11.56566843 +39 48 15.3853581   17.5 17.5 17.18   ~ 160 1
53 ICRF J103303.7+411606 Sy1 10 33 03.70787172 +41 16 06.2329333   20.01 19.64 19.97   ~ 210 1
54 ICRF J103351.4+605107 Sy1 10 33 51.4290959304 +60 51 07.334442756   19.31 18.86 20.24   ~ 166 2
55 ICRF J103507.0+562846 Sy2 10 35 07.03998083 +56 28 46.7956247   20.2 21.244 20.200   ~ 192 1
56 6C 103912+811006 QSO 10 44 23.06257022 +80 54 39.4430485     16.5 18.29   ~ 214 1
57 6C 104451+715930 QSO 10 48 27.61992778 +71 43 35.9384142     19.0 17.49   ~ 240 1
58 4C 72.16 QSO 11 01 48.8056968600 +72 25 37.118997552   17.1 17.9 16.7   ~ 82 1
59 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2675 1
60 6C 110534+434714 QSO 11 08 23.47692946 +43 30 53.6574016   19.97 19.50 19.08   ~ 48 1
61 ICRF J114722.1+350107 Sy2 11 47 22.1297825184 +35 01 07.538786184   17.89 16.83 10.26   ~ 174 1
62 NGC 3894 SyG 11 48 50.35817663 +59 24 56.3822416   12.9   11.57   ~ 245 1
63 8C 1150+812 QSO 11 53 12.49922322 +80 58 29.1545718     19.40 18.54   ~ 237 1
64 6C 124026+380741 QSO 12 42 51.36906848 +37 51 00.0252818   18.86 18.46 18.79   ~ 92 1
65 QSO B1245-197 QSO 12 48 23.89808243 -19 59 18.5899475   21.52 20.5     ~ 139 1
66 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1988 3
67 [VV98] J130605.6+800820 QSO 13 06 05.652 +80 08 20.51     17.02     ~ 11 0
68 ICRF J131053.5+465352 QSO 13 10 53.59160137 +46 53 52.2202295       19.77   ~ 41 0
69 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4486 3
70 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4341 2
71 6C 134240+662054 QSO 13 44 08.67961412 +66 06 11.6437757   19.4 18.6 19.84   ~ 72 1
72 NVSS J135740+435400 rG 13 57 40.5870 +43 53 59.772     22.708 20.951   ~ 47 1
73 ICRF J135840.6+473758 Sy2 13 58 40.66646935 +47 37 58.3115536   19.0       ~ 34 1
74 ICRF J141946.5+542314 Sy2 14 19 46.5974051952 +54 23 14.787857796   16.17 15.65 14.16   ~ 596 1
75 6C 142744+541929 QSO 14 29 21.87879031 +54 06 11.1228062   20.73 20.39 20.5   ~ 93 1
76 6C 143208+421634 QSO 14 34 05.69449191 +42 03 15.9915904   20.07 19.66 20.39   ~ 85 1
77 7C 144255.29+634509.00 QSO 14 43 58.6007128152 +63 32 26.364007788   18.33 17.77 17.1   ~ 61 1
78 ICRF J145844.7+372021 BLL 14 58 44.7945139728 +37 20 21.622681212   20.30 19.81 19.43   ~ 87 1
79 ICRF J150609.5+373051 Sy2 15 06 09.52997529 +37 30 51.1325012   21.2 21.2 20.60   ~ 191 1
80 QSO J1526+6650 QSO 15 26 42.8744737248 +66 50 54.644414316   18.26 17.87 17.24   ~ 55 0
81 ICRF J153552.0+495739 Sy1 15 35 52.0388241552 +49 57 39.080655000   18.2 18.86 18.2   ~ 48 0
82 7C 154336.10+480114.00 QSO 15 45 08.52983300 +47 51 54.6642312   22.50 21.76 20.80   ~ 46 1
83 7C 155055.30+581550.00 Rad 15 51 57.9 +58 06 57           ~ 2 0
84 [VV96] J162304.5+662401 QSO 16 23 04.52169655 +66 24 01.0787041   19.477   17.430   ~ 63 1
85 4C 69.21 QSO 16 42 07.84851261 +68 56 39.7563611   19.723   19.219   ~ 304 1
86 7C 165211.80+395026.00 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2162 2
87 4C 57.28 QSO 16 57 20.70895950 +57 05 53.5036669   18.59 18.28 17.4   ~ 72 1
88 ICRF J170009.2+683006 Sy1 17 00 09.29285259 +68 30 06.9591278     17.00 18.47   ~ 121 1
89 ICRF J172109.4+354216 Sy1 17 21 09.49105029 +35 42 16.0634973   17.5   16.90   ~ 84 1
90 4C 51.37 Bla 17 40 36.97784792 +52 11 43.4073694   18.16 18.70 16.73   ~ 413 1
91 6C 174400+554318 QSO 17 44 56.60706225 +55 42 17.1610560   13.0 13.5     ~ 77 1
92 7C 174604.90+465932.00 BLL 17 47 26.64727228 +46 58 50.9262456     21.30 19.17   ~ 59 1
93 3C 371 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 857 2
94 ICRF J182314.1+793849 Sy2 18 23 14.10855195 +79 38 49.0018505   19.269 16.70 17.415   ~ 67 1
95 QSO J1840+3900 QSO 18 40 57.15422373 +39 00 45.7240946     19.20 19.14   ~ 53 1
96 NVSS J184535+354116 rG 18 45 35.10883099 +35 41 16.7264948   19.830   21.900   ~ 64 0
97 QSO B1851+488 QSO 18 52 28.54781487 +48 55 47.4814782   19.0   18.77   ~ 102 1
98 4C 73.18 BLL 19 27 48.4947009120 +73 58 01.572558816     16.06 15.11   ~ 534 2
99 ICRF J194431.5+544807 BLL 19 44 31.51155734 +54 48 07.0622434   21.732   18.591   ~ 72 1
100 QSO B1946+708 BLL 19 45 53.51966298 +70 55 48.7285673   18.726 16.70 17.199   ~ 139 2
101 QSO B1954+513 QSO 19 55 42.73825546 +51 31 48.5461173     18.5 17.34   ~ 237 1
102 8C 2007+777 BLL 20 05 30.9987913056 +77 52 43.248139536     16.5 17.36   ~ 446 1
103 6C 200700+660005 QSO 20 07 28.77109025 +66 07 22.5355796     18.20 20.30   ~ 57 0
104 ICRF J202206.6+613658 Sy2 20 22 06.68174620 +61 36 58.8047323     19.00 17.58   ~ 321 1
105 ICRF J211401.1+820448 Sy1 21 14 01.1713534464 +82 04 48.340509096           ~ 131 1
106 NVSS J214016+391146 Rad 21 40 16.94709539 +39 11 44.8546253           ~ 18 1
107 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2259 1
108 6C 222905+693121 BLL 22 30 36.46973826 +69 46 28.0769147     19.6 20.11   ~ 95 1
109 6C 223524+730738 QSO 22 36 38.59700566 +73 22 52.6622929       19.90   ~ 41 1
110 QSO B2253+417 QSO 22 55 36.70783988 +42 02 52.5326109     18.8     ~ 79 1
111 6C 230937+452727 QSO 23 11 47.40897544 +45 43 56.0164210       19.19   ~ 61 1
112 ICRF J232220.3+444542 QSO 23 22 20.35808015 +44 45 42.3536071       20.70   ~ 38 1
113 6C 235239+493337 BLL 23 55 09.45814429 +49 50 08.3394994   21.101   18.400   ~ 267 1
114 6C 235401+813601 QSO 23 56 22.79391486 +81 52 52.2550985     20.3 18   ~ 64 1
115 [VV96] J235859.8+392228 QSO 23 58 59.85517054 +39 22 28.3057319     21.20 19.2   ~ 62 1

To bookmark this query, right click on this link: simbad:objects in 2018MNRAS.481.1578A and select 'bookmark this link' or equivalent in the popup menu