2021ApJS..255...28G

Query : 2021ApJS..255...28G

2021ApJS..255...28G - Astrophys. J., Suppl. Ser., 255, 28-28 (2021/August-0)

Evolution of cold gas at 2 < z < 5: a blind search for H I and OH absorption lines toward mid-infrared color-selected radio-loud AGN.

GUPTA N., SRIANAND R., SHUKLA G., KROGAGER J-.K., NOTERDAEME P., COMBES F., DUTTA R., FYNBO J.P.U., HILTON M., MOMJIAN E., MOODLEY K. and PETITJEAN P.

Abstract (from CDS):

We present results from a spectroscopically blind search for associated and intervening H I 21 cm and OH 18 cm absorption lines toward 88 active galactic nuclei (AGN) at 2 <= z <= 5 using the uGMRT. The sample of AGN with 1.4 GHz spectral luminosity in the range 1027–29.3 W Hz–1 is selected using mid-infrared colors and closely resembles the distribution of the underlying quasar population. The search for associated or proximate absorption, defined to be within 3000 km s–1 of the AGN redshift, led to one H I 21 cm absorption detection (M1540-1453; zabs = 2.1139). This is only the fourth known absorption at z > 2. The detection rate (1.6–1.4+3.8%) suggests a low covering factor of the cold neutral medium (CNM; T ∼ 100 K) associated with these powerful AGN. The intervening absorption line search, with a sensitivity to detect the CNM in damped Lyα systems (DLAs), has comoving absorption path lengths of ΔX = 130.1 and 167.7 for H I and OH, respectively. The corresponding number of absorbers per unit comoving path length are <=0.014 and <=0.011, respectively. The former is at least 4.5 times lower than that of DLAs and consistent with the CNM cross section estimated using H2 and C I absorbers at z > 2. Our AGN sample is optically fainter compared to the quasars used to search for DLAs in the past. In our optical spectra obtained using SALT and NOT, we detect five intervening (redshift path ∼9.3) and two proximate DLAs. This is slightly excessive compared to the statistics based on optically selected quasars. The nondetection of H I 21 cm absorption from these DLAs suggests a small CNM covering fraction around galaxies at z > 2.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Active galaxies - Galaxies - AGN host galaxies - Quasar absorption line spectroscopy - Interstellar medium

VizieR on-line data: <Available at CDS (J/ApJS/255/28): table1.dat>

Simbad objects: 95

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Number of rows : 95
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 4C 12.06 QSO 00 42 43.0250041944 +12 46 57.226401300     20     ~ 13 2
2 SDSS J005315.69-070232.3 QSO 00 53 15.6904161864 -07 02 32.490873636           ~ 6 1
3 PKS J0130-1724 rG 01 30 47.3153 -17 25 06.237           ~ 5 1
4 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
5 PMN J0212-3822 rG 02 12 31.7273 -38 22 56.996           ~ 4 1
6 NVSS J022613+093726 QSO 02 26 13.7149921054 +09 37 26.753629926   18.0 18.5     ~ 52 1
7 BWE 0223+1927 QSO 02 26 39.9311 +19 41 10.565           ~ 5 1
8 SDSS J024939.95+044028.2 QSO 02 49 39.9505554480 +04 40 28.169789700           ~ 12 1
9 QSO B0248-266 QSO 02 50 35.56919036 -26 27 42.5157092     19.0     ~ 27 1
10 GLEAM J032808-015219 QSO 03 28 08.6835 -01 52 21.035           ~ 6 1
11 4C 05.19 QSO 04 14 37.76734974 +05 34 42.3295956   24.100 23.800 21.270   ~ 371 2
12 ICRF J041620.5-333932 QSO 04 16 20.5108761432 -33 39 32.352022548           ~ 15 0
13 ICRF J042248.4-203456 QSO 04 22 48.4613848656 -20 34 56.041789512           ~ 16 1
14 ICRF J044849.4-093531 QSO 04 48 49.4698761816 -09 35 31.502494356           ~ 19 1
15 GLEAM J050725-362442 QSO 05 07 25.0660 -36 24 43.178           ~ 4 1
16 QSO B0509+152 QSO 05 12 41.01299191 +15 17 23.4809390   21.3       ~ 30 1
17 ICRF J051340.0+010021 QSO 05 13 40.0322176080 +01 00 21.656092284           ~ 28 1
18 PKS J0515-0119 rG 05 15 11.1824 -01 20 01.912           ~ 4 1
19 ICRF J051656.3+073253 BLL 05 16 56.36467378 +07 32 53.2507821           ~ 17 1
20 QSO B0521-262 QSO 05 23 18.4698419808 -26 14 09.551529060   18.5       ~ 36 1
21 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
22 ICRF J061038.7-230145 QSO 06 10 38.7873548352 -23 01 45.833906280           ~ 24 0
23 4C 72.10 QSO 06 10 48.87326745 +72 48 53.1837769           ~ 36 1
24 PKS J0618-3158 rG 06 18 56.0067890442 -31 58 35.286095790           ~ 5 2
25 NVSS J063602-311312 rG 06 36 02.3590547908 -31 13 11.723137633           ~ 5 1
26 GLEAM J063613-310641 QSO 06 36 13.4947 -31 06 44.154           ~ 5 1
27 PKS J0652-3230 rG 06 52 54.5580 -32 30 20.766           ~ 5 1
28 PKS J0702-3301 rG 07 02 49.2811 -33 02 04.231           ~ 4 1
29 ICRF J073158.9+143336 QSO 07 31 58.9972463376 +14 33 36.493224588           ~ 19 1
30 PMN J0737-3828 rG 07 37 14.6037761190 -38 28 39.547841023           ~ 7 1
31 BWE 0805+0105 QSO 08 08 04.3454100984 +00 57 07.585372512   18.5 19.0     ~ 11 1
32 ICRF J081936.6-063048 QSO 08 19 36.64751947 -06 30 48.1685132           ~ 21 1
33 PMN J0858-2607 rG 08 58 26.8513 -26 07 20.964           ~ 7 1
34 NVSS J090530+340756 rG 09 05 30.101 +34 07 56.90   24.0 23.800 23.500   ~ 163 1
35 GLEAM J090910-163756 QSO 09 09 10.5695 -16 37 56.383           ~ 5 1
36 ICRF J091051.0-052629 QSO 09 10 51.0021266760 -05 26 29.192334864           ~ 15 0
37 ICRF J095231.6-245350 Bla 09 52 31.65445876 -24 53 50.8871557           ~ 24 1
38 QSO B1004-125 QSO 10 07 15.22772619 -12 47 45.9943517           ~ 27 1
39 ICRF J101313.1-254654 QSO 10 13 13.10506739 -25 46 54.6932635           ~ 20 1
40 PMN J1025-0429 rG 10 25 48.7738539824 -04 29 32.712367909           ~ 7 1
41 GLEAM J104314-232318 QSO 10 43 14.5257 -23 23 19.308           ~ 6 1
42 ICRF J111820.6-305458 QSO 11 18 20.6101322712 -30 54 58.528439748     18.5     ~ 19 1
43 4C -05.47 QSO 11 19 17.4298282992 -05 27 07.107830604           ~ 13 1
44 ICRF J112402.5-150158 QSO 11 24 02.56561896 -15 01 58.9491926           ~ 26 1
45 AT20G J114226-263312 QSO 11 42 26.5754082072 -26 33 12.929080826           ~ 11 1
46 PMN J1152-2701 rG 11 52 22.0213 -27 01 26.168           ~ 4 1
47 PMN J1153-0442 rG 11 53 06.6657 -04 42 55.872           ~ 8 2
48 QSO B1157+014 QSO 11 59 44.8278142392 +01 12 06.985999764   17.87 17.52     ~ 228 1
49 Cul 1203-069 QSO 12 06 32.1844528776 -07 14 53.221063848           ~ 6 1
50 AT20G J121514-062802 QSO 12 15 14.3940116712 -06 28 03.932639976           ~ 12 1
51 ICRF J123150.2-123637 QSO 12 31 50.2666985232 -12 36 37.048009284           ~ 16 1
52 AT20G J123410-332638 QSO 12 34 09.9712 -33 26 38.777           ~ 6 1
53 FIRST J124449.0-044609 QSO 12 44 49.0259622984 -04 46 08.951329164           ~ 10 1
54 AT20G J125443-383356 QSO 12 54 42.98 -38 33 56.9           ~ 10 1
55 GLEAM J125611-214405 BLL 12 56 11.4190 -21 44 10.958           ~ 6 1
56 GLEAM J131208-202649 QSO 13 12 07.8590 -20 26 52.894           ~ 14 1
57 PKS J1326-2808 rG 13 26 57.1843 -28 08 32.684           ~ 4 1
58 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
59 GLEAM J135132-101930 QSO 13 51 31.9883 -10 19 32.197           ~ 9 1
60 PSO J213.3632-34.3765 QSO 14 13 27.1741720494 -34 22 35.592986143           ~ 7 1
61 ICRF J143708.9-294718 QSO 14 37 08.9687082600 -29 47 18.624107580           ~ 14 1
62 ICRF J144851.1-112215 QSO 14 48 51.1602316296 -11 22 15.731746968           ~ 25 1
63 PMN J1453-1327 rG 14 53 42.9495 -13 27 35.846           ~ 7 1
64 QSO B1452-168 QSO 14 55 02.81065781 -17 00 13.9533285           ~ 30 1
65 SDSS J145625.80+045644.8 QSO 14 56 25.7980051008 +04 56 44.741171616           ~ 11 1
66 NVSS J145908-164542 rG 14 59 08.9012 -16 45 41.972           ~ 7 1
67 NVSS J150425+081858 rG 15 04 25.2867080328 +08 18 58.810741452           ~ 6 1
68 NVSS J151129-072255 rG 15 11 28.9750 -07 22 56.105           ~ 5 1
69 NVSS J151304-252439 rG 15 13 04.7690 -25 24 39.785           ~ 7 2
70 ICRF J151944.7-115144 QSO 15 19 44.78400565 -11 51 44.5267187           ~ 21 1
71 NVSS J154015-145341 rG 15 40 15.2488 -14 53 41.911           ~ 9 1
72 PSO J239.6057-21.9198 QSO 15 58 25.3681052859 -21 55 11.273298461           ~ 5 0
73 GLEAM J161907-093952 QSO 16 19 07.4485 -09 39 52.595           ~ 6 1
74 PKS J1620+0036 rG 16 20 47.9601444888 +00 36 53.197065036           ~ 10 1
75 ICRF J164950.4+062653 QSO 16 49 50.4913924536 +06 26 53.449498248     19.0     ~ 20 1
76 CRATES J165037-124848 QSO 16 50 38.0166 -12 48 53.279           ~ 6 1
77 PMN J1654+0017 rG 16 54 35.3888 +00 17 19.203           ~ 6 1
78 ICRF J194110.2-300720 BLL 19 41 10.2424312536 -30 07 20.441767440           ~ 18 1
79 PMN J2002-1455 rG 20 02 09.3579616368 -14 55 31.790239932           ~ 9 1
80 PMN J2017-2934 rG 20 17 08.9540 -29 33 55.291           ~ 4 1
81 CRATES J203425-052326 QSO 20 34 25.6234 -05 23 31.805           ~ 8 1
82 ICRF J204737.6-184141 QSO 20 47 37.6555531320 -18 41 41.350936452           ~ 19 1
83 PMN J2052-2233 rG 20 52 44.9740776449 -22 34 10.358369733           ~ 8 1
84 AT20G J210143-174758 QSO 21 01 43.3266 -17 47 59.267   18       ~ 16 1
85 PMN J2128-1504 rG 21 28 21.8906538816 -15 04 52.708024488           ~ 8 1
86 ICRF J220127.5+031215 QSO 22 01 27.50869508 +03 12 15.1627048           ~ 20 1
87 PSO J335.8866-31.0215 QSO 22 23 32.7992913608 -31 01 17.658981923           ~ 4 0
88 PMN J2238-1240 rG 22 38 16.2883 -12 40 36.625           ~ 5 1
89 PMN J2241-2442 rG 22 41 11.5060 -24 42 38.391           ~ 10 1
90 BWE 2244+1155 QSO 22 47 05.5592 +12 11 51.845           ~ 5 1
91 PMN J2249-2635 rG 22 49 50.5707 -26 34 59.579           ~ 5 1
92 SDSS J230036.36+194001.4 QSO 23 00 36.3632095824 +19 40 01.425959076           ~ 12 1
93 BWE 2314+0413 QSO 23 16 34.6047597384 +04 29 39.893732484           ~ 8 1
94 PMN J2349-0437 rG 23 49 10.1659040690 -04 38 03.394460643           ~ 9 1
95 SDSS J235722.50-073134.0 QSO 23 57 22.5083725680 -07 31 34.022977572           ~ 18 1

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