2011A&A...536A..35F

Query : 2011A&A...536A..35F

2011A&A...536A..35F - Astronomy and Astrophysics, volume 536A35-35 (2011/12-1)

Optically faint radio sources: reborn AGN?

FILHO M.E., BRINCHMANN J., LOBO C. and ANTON S.

Abstract (from CDS):

We present our discovery of several relatively strong radio sources in the field-of-view of SDSS galaxy clusters that have no optical counterparts down to the magnitude limits of the SDSS. The optically faint radio sources appear as double-lobed or core-jet objects in the FIRST radio images and have projected angular sizes ranging from 0.5 to 1.0-arcmin. We followed-up these sources with near-infrared imaging using the wide-field imager HAWK-I on the VLT. We detected Ks-band emitting regions, about 1.5-arcsec in size and coincident with the centers of the radio structures, in all sources, with magnitudes in the range 17-20mag. We used spectral modelling to characterize the sample sources. In general, the radio properties are similar to those observed in 3CRR sources but the optical-radio slopes are consistent with those of moderate to high redshift (z<4) gigahertz-peaked spectrum sources. Our results suggest that these unusual objects are galaxies whose black hole has been recently re-ignited but that retain large-scale radio structures, which are signatures of previous AGN activity.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active

Nomenclature: Tables 3,4 : [FBL2011] NNNNN Aa ; [FBL2011] NNNNN AN N=28+26

Simbad objects: 63

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Number of rows : 63
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 FIRST J000328.7-111249 Rad 00 03 28.716 -11 12 49.23           ~ 1 0
2 NVSS J000328-111255 Rad 00 03 28.78 -11 12 55.1           ~ 1 0
3 FIRST J000328.8-111302 Rad 00 03 28.871 -11 13 02.31           ~ 1 0
4 [FBL2011] 11390 N BiC 00 03 28.911 -11 12 53.63           ~ 1 0
5 [FBL2011] 11390 E NIR 00 03 29.109 -11 12 52.75           ~ 1 0
6 FIRST J000556.7-090908 Rad 00 05 56.711 -09 09 08.57           ~ 1 0
7 [FBL2011] 11780 N BiC 00 05 57.061 -09 08 58.43           ~ 1 0
8 NVSS J000557-090901 Rad 00 05 57.07 -09 09 01.1           ~ 2 0
9 [FBL2011] 11780 L NIR 00 05 57.324 -09 08 52.20           ~ 1 0
10 FIRST J000557.4-090848 Rad 00 05 57.490 -09 08 48.77           ~ 1 0
11 Mrk 1501 Bla 00 10 31.00590413 +10 58 29.5042981   15.96 15.40 12.22   ~ 763 1
12 FIRST J002452.3-005214 Rad 00 24 52.332 -00 52 14.76           ~ 1 0
13 NVSS J002452-005205 Rad 00 24 52.61 -00 52 05.6           ~ 1 0
14 [FBL2011] 6167 N BiC 00 24 52.655 -00 52 01.49           ~ 1 0
15 FIRST J002452.7-005154 Rad 00 24 52.733 -00 51 54.90           ~ 1 0
16 SDSS J003447.21-002145.5 G 00 34 47.21491 -00 21 45.2848           ~ 1 0
17 SDSS J003447.50-002145.3 G 00 34 47.51897 -00 21 44.7774           ~ 1 0
18 SDSS J003447.71-002126.9 G 00 34 47.71486 -00 21 27.2145           ~ 1 0
19 [FBL2011] 3131 N NIR 00 34 48.040 -00 21 32.47           ~ 1 0
20 SDSS J003448.35-002129.2 G 00 34 48.35821 -00 21 29.2639           ~ 1 0
21 NVSS J003448-002131 rG 00 34 48.42382 -00 21 35.7599           ~ 1 0
22 [FBL2011] 3131 E1 NIR 00 34 48.774 -00 21 20.20           ~ 1 0
23 SDSS J003448.94-002124.6 G 00 34 48.94597 -00 21 24.5846           ~ 1 0
24 SDSS J003448.99-002130.9 G 00 34 49.00111 -00 21 30.9332           ~ 1 0
25 FIRST J004358.8+001216 Rad 00 43 58.808 +00 12 16.19           ~ 1 0
26 [FBL2011] 8495 Na NIR 00 43 59.447 +00 12 30.01           ~ 1 0
27 NVSS J004359+001231 rG 00 43 59.47600 +00 12 30.4409           ~ 2 0
28 [FBL2011] 8495 D NIR 00 43 59.498 +00 12 26.22           ~ 1 0
29 [FBL2011] 8495 Nb NIR 00 43 59.526 +00 12 30.84           ~ 1 0
30 FIRST J004400.1+001243 Rad 00 44 00.178 +00 12 43.26           ~ 1 0
31 [FBL2011] 2596 W NIR 01 01 59.311 -10 33 10.95           ~ 1 0
32 NVSS J010200-103303 rG 01 01 59.687 -10 33 08.76           ~ 2 1
33 [FBL2011] 2596 E NIR 01 02 02.089 -10 32 57.99           ~ 1 0
34 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 266 1
35 FIRST J020128.1-082005 Rad 02 01 28.175 -08 20 05.50           ~ 1 0
36 [FBL2011] 11079 N BiC 02 01 28.258 -08 19 56.63           ~ 1 0
37 NVSS J020128-081955 Rad 02 01 28.370 -08 19 56.05           ~ 3 1
38 [FBL2011] 11079 S1 NIR 02 01 28.433 -08 20 01.79           ~ 1 0
39 [FBL2011] 11079 S2 NIR 02 01 28.493 -08 20 11.35           ~ 1 0
40 FIRST J020128.6-081947 Rad 02 01 28.638 -08 19 47.07           ~ 1 0
41 [FBL2011] 11079 S3 NIR 02 01 28.691 -08 20 08.10           ~ 1 0
42 [FBL2011] 11079 L NIR 02 01 28.865 -08 19 46.39           ~ 1 0
43 [FBL2011] 10942 W NIR 02 17 57.166 -09 18 05.27           ~ 1 0
44 FIRST J021757.3-091829 Rad 02 17 57.363 -09 18 29.11           ~ 1 0
45 NVSS J021757-091822 Rad 02 17 57.37 -09 18 22.8           ~ 4 1
46 [FBL2011] 10942 N BiC 02 17 57.382 -09 18 18.10           ~ 1 0
47 FIRST J021757.4-091754 Rad 02 17 57.464 -09 17 54.38           ~ 1 0
48 3C 219 Sy1 09 21 08.6258123424 +45 38 57.358202856   19.56 18.69     ~ 424 2
49 [KJB2018] GRS J0929+4146 rG 09 29 10.660 +41 46 45.59           ~ 24 1
50 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
51 4C 26.35 LIN 11 58 20.138 +26 21 12.08     18.5     ~ 61 2
52 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
53 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
54 ICRF J124733.3+672316 Bla 12 47 33.32959326 +67 23 16.4488689           ~ 100 2
55 Z 294-4 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 2096 3
56 Mrk 668 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 826 3
57 6dFGS gJ140948.9-030233 rG 14 09 48.8587886760 -03 02 32.631257292   17.98   16.44   ~ 44 0
58 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4
59 IC 1065 Sy2 14 49 21.5927137128 +63 16 13.799495280   17.30 16.39     ~ 378 1
60 4C 33.33 rG 14 53 02.8682754912 +33 08 42.450468612           ~ 50 3
61 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
62 8C 1834+620 Sy2 18 35 10.920 +62 04 08.14           ~ 52 2
63 LEDA 68751 Sy1 22 23 49.5398449645 -02 06 12.856394895   16.93 15.77 16.02   ~ 511 2

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