2020A&A...643A.174M

Query : 2020A&A...643A.174M

2020A&A...643A.174M - Astronomy and Astrophysics, volume 643A174-174 (2020/11-1)

uGMRT HI 21-cm absorption observations of two extremely inverted spectrum sources.

MHASKEY M., PAUL S., GUPTA N. and MUKHERJEE D.

Abstract (from CDS):

We report the detection of HI 21-cm absorption in a member of the rare and recently discovered class of compact radio sources: extremely inverted spectrum extragalactic radio sources (EISERS). The EISERS conceivably form a special subclass of the inverted spectrum radio galaxies since the spectral index of the optically thick part of the spectrum for these sources crosses the synchrotron self-absorption limit of α=+2.5 (S(ν) ∝ να). We searched for HI absorption in two EISERS using the recently upgraded Giant Metrewave Radio Telescope (uGMRT) and detected an absorption feature in one of them. The strong associated HI absorption detected against the source J1209-2032 (z=0.4040) implies an optical depth of 0.178±0.02, corresponding to an HI column density of 34.8±2.9x1020cm–2, for an assumed HI spin temperature of 100K and covering factor of 1. This is among the highest known optical depth and HI column densities found for compact radio sources of peaked spectrum type and supports the free-free absorption model for the steeply inverted radio spectrum of this source. For the other source, J1549+5038 (z=2.171), no HI absorption was detected in our observations.

Abstract Copyright: © ESO 2020

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: active - galaxies: ISM - radio lines: ISM

VizieR on-line data: <Available at CDS (J/A+A/643/A174): j1209_sp.dat j1549_sp.dat>

Simbad objects: 83

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Number of rows : 83
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 J002127+731241 rG 00 21 27.37516745 +73 12 41.9310797           ~ 37 1
2 QSO B0023-263 BLL 00 25 49.15629900 -26 02 12.6141092   20.30 19.5 18.084   ~ 173 1
3 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 266 1
4 Z 502-27 rG 01 19 35.00087601 +32 10 50.0619670   16 14.5     ~ 249 1
5 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
6 QSO B0201+113 Bla 02 03 46.65705710 +11 34 45.4094619   19.5 19.5 19.41   ~ 216 1
7 7C 022118.10+273638.00 Sy1 02 24 12.2865158736 +27 50 11.538285648   19.502 18 18.263   ~ 210 1
8 QSO B0237-2322 QSO 02 40 08.1743783856 -23 09 15.729012036   16.78 16.63     ~ 516 1
9 6C 024820+430300 Bla 02 51 34.53674154 +43 15 15.8292024     18.0 13.72   ~ 221 1
10 PKS J0255-2153 rG 02 55 39.2471675352 -21 53 51.925499232   17.53       ~ 14 1
11 NGC 1167 LIN 03 01 42.3322774176 +35 12 20.300948892   13.84 12.77     ~ 382 1
12 B1 0344-29 PaG 03 47 00.8 -29 00 25           ~ 10 0
13 3C 93.1 BLL 03 48 46.9073426592 +33 53 15.461439576   20.723   19.110   ~ 133 1
14 4C 76.03 rG 04 10 45.61079426 +76 56 45.3130641   21 22.0 21.200   ~ 164 1
15 PKS 0428+205 rG 04 31 03.76141386 +20 37 34.2648470   22.174   19.085   ~ 198 1
16 2C 396 QSO 04 32 36.50262174 +41 38 28.4497778     20.0     ~ 231 1
17 QSO J0459+0229 QSO 04 59 52.05066296 +02 29 31.1765162   18.2 19     ~ 166 2
18 ICRF J050321.1+020304 Sy2 05 03 21.19716454 +02 03 04.6765714   22.500 21.350 20.682   ~ 196 1
19 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 910 1
20 QSO B0528-2505 Bla 05 30 07.9627395840 -25 03 29.900044512   18.17 17.34 17.7   ~ 429 1
21 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
22 7C 055201.39+394824.00 Bla 05 55 30.80561419 +39 48 49.1649683     18.30 17.5   ~ 527 2
23 ICRF J055652.6-024105 Sy2 05 56 52.62300614 -02 41 05.5163562   20.968   19.533   ~ 36 1
24 QSO B0636+68 BLL 06 42 04.2572705040 +67 58 35.620484340     16.46 16.01   ~ 234 1
25 NVSS J073328+560541 rG 07 33 28.6148 +56 05 41.730           ~ 32 1
26 6C 073759+311929 Bla 07 41 10.70330407 +31 12 00.2291151   17.02 16.89 16.322   ~ 468 1
27 QSO B0742+103 Bla 07 45 33.05952486 +10 11 12.6922178     24.00 23.72   ~ 200 1
28 QSO J0753+4231 QSO 07 53 03.3374580696 +42 31 30.765827964   19.16 18.43     ~ 91 1
29 2MASX J07575670+3959363 Sy2 07 57 56.7148709832 +39 59 36.104570412           ~ 47 1
30 LEDA 2275964 Bla 08 31 39.8039 +46 08 00.775   18.94 18.07 13.6   ~ 38 1
31 QSO B0858-279 BLL 09 00 40.0387763688 -28 08 20.351114232   14.74 17 19.00   ~ 77 1
32 9C J0936+3313 LIN 09 36 09.3738424789 +33 13 08.458026732       13.85   ~ 26 1
33 ICRF J094336.9-081930 LIN 09 43 36.94453828 -08 19 30.8202783   19.401   18.100   ~ 125 2
34 3C 237.0 rG 10 08 00.0529 +07 30 16.830   21       ~ 197 1
35 ICRF J103507.0+562846 Sy2 10 35 07.03998083 +56 28 46.7956247   20.2 21.244 20.200   ~ 205 1
36 ICRF J112027.8+142054 Sy2 11 20 27.80814059 +14 20 54.9730732   20 20.935 20.100   ~ 175 1
37 3C 258 rG 11 24 43.69438 +19 19 28.1428   22.082 21.448 20.513   ~ 86 2
38 6C 114716+554640 Bla 11 50 00.16487 +55 28 20.8780       14.3   ~ 29 1
39 3C 268.3 Sy2 12 06 24.70656 +64 13 36.8760 22.74 21.847 20.790 19.910   ~ 196 1
40 NVSS J120902+411559 rG 12 09 02.7905671200 +41 15 59.305654152           ~ 16 1
41 ICRF J120914.6-203238 BLL 12 09 14.61098486 -20 32 38.9903887   21.68   18.75   ~ 35 1
42 ICRF J124449.1+404806 Sy1 12 44 49.1889 +40 48 06.150   19.0 19.0     ~ 87 1
43 2E 2879 Sy1 12 52 26.3561235816 +56 34 19.573734864   18.42 18.11 17.660   ~ 293 2
44 PKS 1306-09 rG 13 08 39.1573432224 -09 50 32.424542340   20.767 20.500 18.439   ~ 81 1
45 4C 32.44 QSO 13 26 16.5142 +31 54 09.522   21.367 19.822 18.882   ~ 181 1
46 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
47 QSO B1333+459 Bla 13 35 21.9623576640 +45 42 38.232772128   18.30 18.22 17.67   ~ 107 1
48 PKS 1345+12 Sy2 13 47 33.36161873 +12 17 24.2398927   19.28 18.44 15.718   ~ 652 2
49 NVSS J135740+435400 rG 13 57 40.5870 +43 53 59.772     22.708 20.951   ~ 50 1
50 ICRF J140028.6+621038 Sy2 14 00 28.64823540 +62 10 38.5885744   22.137 20.373 19.530   ~ 187 1
51 Mrk 668 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 826 3
52 87GB 140732.1+361738 Sy1 14 09 42.4485402456 +36 04 15.887047296           ~ 25 1
53 8C 1443+773 Sy2 14 43 14.5707907691 +77 07 27.607161183   19   18.730   ~ 152 1
54 3C 318.0 QSO 15 20 05.4773966208 +20 16 05.471959692   21.93 20.9     ~ 197 1
55 4C 04.51 rG 15 21 14.41846935 +04 30 21.6366133   18.2       ~ 103 1
56 ICRF J154609.5+002624 Bla 15 46 09.53146317 +00 26 24.6145149   19.730 18.900 19.5   ~ 91 1
57 QSO B1547+507 Bla 15 49 17.46855793 +50 38 05.7880702   18.89 18.74 18.16   ~ 140 1
58 4C 52.37 Sy1 16 02 46.3870735776 +52 43 58.675644984   18.50 17.76     ~ 45 1
59 PKS 1601-222 rG 16 04 01.47174802 -22 23 40.9881985   21.0       ~ 40 1
60 ICRF J163433.8+624535 Sy2 16 34 33.80623119 +62 45 35.8960467   21.06 20.61     ~ 220 1
61 ICRF J163828.2+623444 Sy2 16 38 28.22535940 +62 34 44.3168151   20.7 20.7     ~ 167 2
62 6C 170204+454510 Sy1 17 03 30.3824218008 +45 40 47.166180564   16.0       ~ 170 2
63 7C 1815+6125 BLL 18 15 36.79225624 +61 27 11.6475505   21.272   19.122   ~ 44 1
64 ICRF J181623.9+345745 Sy2 18 16 23.90102409 +34 57 45.7493697   20.342   18.459   ~ 34 1
65 QSO B1826+796 Bla 18 23 14.10855195 +79 38 49.0018505   19.269 16.70 17.415   ~ 74 1
66 ICRF J183114.8+290710 Sy2 18 31 14.85954059 +29 07 10.2942036   21.917 20.2 20.200   ~ 78 1
67 NVSS J184535+354116 rG 18 45 35.10883099 +35 41 16.7264948   19.830   21.900   ~ 68 0
68 QSO B1848+283 Bla 18 50 27.5898721080 +28 25 13.155071160   17.1 17 17.16   ~ 87 1
69 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
70 ICRF J194431.5+544807 BLL 19 44 31.51155734 +54 48 07.0622434   21.732   18.591   ~ 80 1
71 QSO B1946+708 BLL 19 45 53.51966298 +70 55 48.7285673   18.726 16.70 17.199   ~ 147 2
72 QSO B2000-330 Bla 20 03 24.1161711720 -32 51 45.136882080   18.83 18.4 17.11   ~ 279 1
73 QSO B2021+614 Bla 20 22 06.68174620 +61 36 58.8047323     19.00 17.58   ~ 335 1
74 ICRF J205252.0+363535 Sy2 20 52 52.05501061 +36 35 35.3005698   22.083   21.200   ~ 112 2
75 4C 05.78 rG 20 58 26 +05 40.7           ~ 14 0
76 QSO B2126-15 Bla 21 29 12.17589329 -15 38 41.0419083   17.61 17.3 17.3   ~ 521 1
77 ICRF J213032.8+050217 AG? 21 30 32.87740078 +05 02 17.4745177     23.4     ~ 164 1
78 ICRF J213750.0-204231 Sy1 21 37 50.00785656 -20 42 31.6728477   20.400 19.4 19.286   ~ 102 1
79 QSO B2149+056 Bla 21 51 37.87549026 +05 52 12.9545152   23.700 22.050 20.850   ~ 120 1
80 2MASX J22502534+1419519 Sy1 22 50 25.3475290512 +14 19 52.095751140   17.28 16.97 17.243   ~ 210 1
81 6C 232316+433021 Sy2 23 25 42.2873689152 +43 46 58.689756804   18.0 18.0     ~ 39 1
82 ICRF J234403.7+822640 Sy2 23 44 03.8302221504 +82 26 40.345410408   21.769 20.5 20.220   ~ 104 1
83 6C 235239+493337 BLL 23 55 09.45814429 +49 50 08.3394994   21.101   18.400   ~ 284 1

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