2019MNRAS.486.5158N

Query : 2019MNRAS.486.5158N

2019MNRAS.486.5158N - Mon. Not. R. Astron. Soc., 486, 5158-5170 (2019/July-2)

A low-frequency study of recently identified double-double radio galaxies.

NANDI S., SAIKIA D.J., ROY R., DABHADE P., WADADEKAR Y., LARSSON J., BAES M., CHANDOLA H.C. and SINGH M.

Abstract (from CDS):

In order to understand the possible mechanisms of recurrent jet activity in radio galaxies and quasars, which are still unclear, we have identified such sources with a large range of linear sizes (220-917 kpc), and hence timescales of episodic activity. Here we present high-sensitivity 607-MHz Giant Metrewave Radio Telescope (GMRT) images of 21 possible double-double radio galaxies (DDRGs) identified from the FIRST survey to confirm their episodic nature. These GMRT observations show that none of the inner compact components suspected to be hotspots of the inner doubles are cores having a flat radio spectrum, confirming the episodic nature of these radio sources. We have identified a new DDRG with a candidate quasar, and have estimated the upper spectral age limits for eight sources which showed marginal evidence of steepening at higher frequencies. The estimated age limits (11-52 Myr) are smaller than those of the large-sized (∼1 Mpc) DDRGs.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: jets - galaxies: nuclei - (galaxies:) quasars: supermassive black holes - radio continuum: galaxies

Simbad objects: 47

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Number of rows : 47
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 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
3 8C 0609+607 Bla 06 14 23.86617701 +60 46 21.7559176   20 19.1 18.8   ~ 74 1
4 QSO B0710+439 QSO 07 13 38.16413557 +43 49 17.2072102   20.7       ~ 256 0
5 6C 073759+311929 Bla 07 41 10.70330407 +31 12 00.2291151   17.02 16.89 16.322   ~ 468 1
6 QSO J0746+4526 QSO 07 46 17.9306539056 +45 26 34.391573556           ~ 8 0
7 NVSS J080442+580938 rG 08 04 42.8548304040 +58 09 34.952477472           ~ 10 2
8 QSO B0839+187 Bla 08 42 05.0940565824 +18 35 40.988568300   16.63 16.36 16.56   ~ 196 2
9 NVSS J085548+420416 rG 08 55 49.15008 +42 04 20.1144           ~ 8 1
10 BWE 0908+0357 rG 09 10 59.100 +03 45 31.68           ~ 2 0
11 3C 219 Sy1 09 21 08.6258123424 +45 38 57.358202856   19.56 18.69     ~ 424 2
12 4C 02.27 QSO 09 35 18.1942545696 +02 04 15.563959968   17.31 17.16     ~ 123 1
13 ICRF J094336.9-081930 LIN 09 43 36.94453828 -08 19 30.8202783   19.401   18.100   ~ 125 2
14 4C 05.44 rG 10 39 28.21920 +05 36 13.6224     18.0     ~ 18 1
15 NVSS J110309+063622 rG 11 03 13.29216 +06 36 16.0056           ~ 3 0
16 ICRF J112027.8+142054 Sy2 11 20 27.80814059 +14 20 54.9730732   20 20.935 20.100   ~ 175 1
17 4C -00.47 Bla 11 50 43.8706351104 -00 23 54.203006868   17.51 17.38 17.1   ~ 375 1
18 NVSS J120854+082144 rG 12 08 56.78112 +08 21 38.5776           ~ 2 0
19 NVSS J123818+160324 rG 12 38 21.20496 +16 02 41.4240           ~ 2 0
20 SDSS J124013.48+212233.0 rG 12 40 13.48392 +21 22 33.0456           ~ 1 0
21 QSO B1252+119 Bla 12 54 38.25561478 +11 41 05.8950431   16.99 16.64 16.76   ~ 284 1
22 FIRST J132613.6+192423 rG 13 26 13.6699233072 +19 24 23.847534504           ~ 7 0
23 2MASX J13284845+2752280 Sy2 13 28 48.4535304528 +27 52 27.836065992           ~ 27 0
24 7C 132816.2+252436 QSO 13 30 37.6960744824 +25 09 10.983105972   18.31 17.67     ~ 373 1
25 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
26 FIRST J134447.0-003009 rG 13 44 46.92744 -00 30 09.3204     21.67     ~ 6 0
27 Z 162-21 BLL 13 52 17.8719816576 +31 26 46.487381604   16.10 15.10     ~ 502 3
28 QSO B1351-018 Bla 13 54 06.89532721 -02 06 03.1904962   20.62 19.91 19.277   ~ 177 1
29 ICRF J140028.6+621038 Sy2 14 00 28.64823540 +62 10 38.5885744   22.137 20.373 19.530   ~ 187 1
30 4C 51.31 rG 14 07 18.4831004424 +51 32 04.633307844   21.3       ~ 14 0
31 ICRF J143844.7+621154 Sy1 14 38 44.7834430248 +62 11 54.412540044   19.48 19.07     ~ 75 1
32 QSO B1445+101 Bla 14 45 16.46525080 +09 58 36.0727447   18.58 17.78     ~ 408 2
33 NVSS J150055+154235 rG 15 00 55.18200 +15 42 40.5648           ~ 2 0
34 NVSS J152105+521444 rG 15 21 05.90544 +52 14 39.9120           ~ 4 1
35 NVSS J153840-024139 rG 15 38 41.31576 -02 42 05.5188           ~ 2 0
36 SDSS J154517.20+504753.9 rG 15 45 17.210 +50 47 53.94           ~ 4 0
37 PKS 1545-321 rG 15 48 58.0331477149 -32 16 58.157614838           ~ 51 1
38 QSO B1555+001 Bla 15 57 51.43397121 -00 01 50.4137827   20.10 19.72 18.75   ~ 188 1
39 NVSS J160513+071053 rG 16 05 13.74864 +07 11 52.5660           ~ 3 0
40 ICRF J160913.3+264129 Sy2 16 09 13.3196 +26 41 29.042   19       ~ 249 1
41 6C 161147+342017 Bla 16 13 41.06424322 +34 12 47.9088535   17.98 17.46 17.07   ~ 673 1
42 GB6 B1625+2912 rG 16 27 54.63672 +29 06 20.0160           ~ 4 2
43 ICRF J163433.8+624535 Sy2 16 34 33.80623119 +62 45 35.8960467   21.06 20.61     ~ 220 1
44 4C 38.41 Bla 16 35 15.49297809 +38 08 04.5005995   18.14 17.97 17.25   ~ 906 1
45 NVSS J164928+413342 rG 16 49 28.32408 +41 33 41.6124           ~ 4 1
46 NVSS J170517+394022 rG 17 05 17.83584 +39 40 29.2548           ~ 4 1
47 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2

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