2007ApJ...665..225K

Query : 2007ApJ...665..225K

2007ApJ...665..225K - Astrophys. J., 665, 225-231 (2007/August-2)

Optical variability of infrared Power-Law-Selected galaxies and X-ray sources in the GOODS-South field.

KLESMAN A. and SARAJEDINI V.

Abstract (from CDS):

We investigate the use of optical variability to identify and study active galactic nuclei (AGNs) in the GOODS-South field. A sample of 22 mid-IR power-law sources and 102 X-ray sources with optical counterparts in the HST ACS images were selected. Each object is classified with a variability significance value related to the standard deviation of its magnitude in five epochs separated by 45 day intervals. The variability significance is compared to the optical, mid-IR, and X-ray properties of the sources. We find that 26% of all AGN candidates (either X-ray- or mid-IR-selected) are optical variables. The fraction of optical variables increases to 51% when considering sources with soft X-ray band ratios. For the mid-IR AGN candidates which have multiwavelength SEDs, we find optical variability for 64% of those classified with SEDs like broad-line AGNs. While mostly unobscured AGNs appear to have the most significant optical variability, some of the more obscured AGNs are also observed as variables. In particular, we find two mid-IR power-law-selected AGN candidates without X-ray emission that display optical variability, confirming their AGN nature.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active

Simbad objects: 115

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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 - 2026 		#notes
1 [VV2006] J033201.6-274327 QSO 03 32 01.59 -27 43 27.3 24.86 24.5724 24.07 23.405 23.9921 ~ 52 0
2 CANDELS UDS F160W J033203.04-274450.1 Sy2 03 32 03.07 -27 44 50.1   26.9484   25.45 25.0739 ~ 46 0
3 ACS-GC 90046082 Sy2 03 32 03.66 -27 46 03.7   23.5861   20.778 20.2362 ~ 62 0
4 CXOCDFS J033206.3-274537 G 03 32 06.269 -27 45 36.66   24.35   21.692 21.6372 ~ 35 0
5 ACS-GC 90043490 Sy2 03 32 07.98 -27 42 39.9   23.6922 23.2064 22.3383 21.8034 ~ 51 0
6 [LBX2017] 170 AGN 03 32 07.99858 -27 46 57.2578   25.6308   24.931 25.0534 ~ 46 0
7 NAME CDFS J033208.3-274153 Sy1 03 32 08.28 -27 41 53.6   25.4892   24.580 25.3896 ~ 42 0
8 2MASS J03320855-2746483 rG 03 32 08.538 -27 46 48.55   21.0851 20.1035 19.224 18.9552 ~ 63 0
9 [VV2006] J033208.7-274735 QSO 03 32 08.6729857488 -27 47 34.647814356 19.78 19.4713 19.11 18.665 18.6210 ~ 93 0
10 [VV2006] J033209.5-274807 QSO 03 32 09.4575891792 -27 48 07.049493144 22.94 21.4745 21.07 20.422 20.4857 ~ 66 0
11 [SWM2014] GOODS-S 42037 AGN 03 32 10.759 -27 42 34.60   21.3988 20.5247 19.361 19.0745 ~ 51 0
12 ACS-GC 90042257 BLL 03 32 10.90 -27 43 43.4   23.12 22.58 22.31 21.384 ~ 54 0
13 2XMM J033210.9-274415 Sy1 03 32 10.91 -27 44 15.1 23.35 22.500 22.882 22.50 22.3707 ~ 83 0
14 ACS-GC 90045288 Sy2 03 32 11.4075 -27 46 49.973   23.8731 23.1241 22.070 21.423 ~ 54 0
15 ACS-GC 90044172 AGN 03 32 12.196 -27 45 30.11   24.6655 22.444 21.789 21.2217 ~ 49 0
16 ACS-GC 90045884 Sy2 03 32 12.22015 -27 46 20.6382   23.414 24.0292 23.3426 22.266 ~ 57 0
17 ACS-GC 90045613 Sy2 03 32 13.257 -27 42 40.65   21.6424 20.820 20.164 19.8240 ~ 87 0
18 ACS-GC 90045746 Sy2 03 32 13.8495 -27 42 49.018   23.1221 22.348 21.8155 21.2325 ~ 66 0
19 CXOCDFS J033214.1-275101 Sy2 03 32 13.98 -27 51 00.3   23.9234   22.61 21.809 ~ 50 0
20 ACS-GC 90044755 AGN 03 32 14.078 -27 42 30.42   24.8973 24.55 24.169 24.6537 ~ 36 0
21 ACS-GC 90045314 Sy2 03 32 14.42141 -27 51 10.7305   24.3772   24.246 23.3772 ~ 59 0
22 ACS-GC 90042864 QSO 03 32 14.445 -27 44 56.60   24.6079 24.82 24.549 22.302 ~ 32 0
23 CANDELS UDS F160W J033214.55-275256.5 AGN 03 32 14.5474 -27 52 56.556   25.7335 24.93 24.52 24.6603 ~ 24 0
24 ACS-GC 90043493 rG 03 32 14.98 -27 42 25.2   23.814 23.50 23.004 22.8916 ~ 56 0
25 CXOCDFS J033215.9-275325 G 03 32 15.78970 -27 53 24.6473   22.967   24.466 22.1890 ~ 34 0
26 GOODS J033215.79-274629.7 G 03 32 15.7904 -27 46 29.742   23.5880     22.9723 ~ 8 0
27 CXOCDFS J033215.8-274630 QSO 03 32 15.8020 -27 46 30.510   23.8491 23.625 23.10 23.0526 ~ 32 0
28 ACS-GC 90045313 Sy2 03 32 16.14982 -27 49 41.6993   21.553   21.322 20.476 ~ 54 1
29 CXOCDFS J033216.8-274327 AG? 03 32 16.737 -27 43 27.53   24.8568 23.60 22.238 22.0169 ~ 38 0
30 GOODS J033216.85-275007.5 EmG 03 32 16.8508 -27 50 07.498   24.3267     23.781 ~ 9 0
31 ZFOURGE CDFS 4311 AGN 03 32 16.9922 -27 54 01.387   27.9981     26.1159 ~ 18 0
32 CXOCDFS J033217.2-274922 AGN 03 32 17.04953 -27 49 21.8096   20.000 20.295 19.755 19.5240 ~ 45 0
33 ACS-GC 90042334 Sy1 03 32 17.15 -27 43 03.6 23.16 22.5303 22.1603 21.068 20.8398 ~ 88 0
34 ATCDFS9 J033218.02-274718.3 rG 03 32 18.023 -27 47 18.77   21.2676   20.132 19.560 ~ 68 0
35 CANDELS UDS F160W J033218.24-275241.4 Sy1 03 32 18.2555 -27 52 41.418   24.5285 24.6214 24.102 24.2474 ~ 52 0
36 ACS-GC 90045885 Sy2 03 32 18.39 -27 50 55.3   24.8876 24.190 23.82 23.039 ~ 85 0
37 CXOCDFS J033218.5-274557 AGN 03 32 18.44318 -27 45 55.8709   22.344 23.35 25.010 21.2672 ~ 49 1
38 CXOCDFS J033218.9-275136 Sy2 03 32 18.8321 -27 51 35.476   25.15   24.51 25.128 ~ 83 0
39 ACS-GC 90043051 Sy2 03 32 19.02 -27 47 55.7   26.460   24.525 23.664 ~ 51 0
40 ACS-GC 90045761 rG 03 32 19.817 -27 41 22.59 23.36 21.0407 19.580 19.178 18.9776 ~ 63 0
41 ACS-GC 90042601 Sy2 03 32 20.05005 -27 44 47.1529   22.941   25.050 24.7064 ~ 55 0
42 CXOCDFS J033220.3-274555 EmG 03 32 20.31235 -27 45 54.8417   21.4146 20.585 20.369 20.282 ~ 32 0
43 ACS-GC 90044373 Sy2 03 32 20.47022 -27 47 32.3484   22.743 23.88 24.752 21.863 ~ 56 0
44 CXOCDFS J033221.4-274231 Sy2 03 32 21.420 -27 42 31.17   23.3133 22.583 21.963 21.5742 ~ 44 0
45 CXOCDFS J033222.6-274806 rG 03 32 22.514 -27 48 04.99   25.6748 27.82 25.07 25.4668 ~ 29 0
46 ACS-GC 90042090 rG 03 32 22.52 -27 46 04.2   25.2790   24.91 24.424 ~ 63 0
47 CXOCDFS J033222.6-274950 Sy2 03 32 22.53830 -27 49 49.7903   23.498   22.006 22.332 ~ 42 0
48 Anon J033222-2744 rG 03 32 22.597 -27 44 26.11   22.4627 21.570 21.101 20.6063 ~ 62 1
49 CXOCDFS J033222.8-275225 AGN 03 32 22.7614 -27 52 23.959   21.2070   20.19 19.923 ~ 36 0
50 ACS-GC 90042565 rG 03 32 24.26 -27 41 26.8   23.4284 21.661 20.832 20.6072 ~ 51 0
51 CXOCDFS J033224.9-274707 EmG 03 32 24.859 -27 47 06.29   22.0976   20.712 20.5917 ~ 41 0
52 ACS-GC 90044892 Sy2 03 32 24.9576 -27 50 08.048   25.7039   25.08 24.202 ~ 42 0
53 ACS-GC 90043946 Sy2 03 32 24.98108 -27 41 01.5074   23.4535   21.973 21.4414 ~ 47 0
54 ACS-GC 90041437 Sy2 03 32 25.1059 -27 50 43.256   24.8238   24.08 22.938 ~ 47 0
55 ACS-GC 90040981 Sy2 03 32 25.157 -27 54 50.10   23.166   23.17 22.1691 ~ 66 0
56 [PBM2009] s124624 Sy1 03 32 25.21 -27 42 18.8   24.7725 23.75 23.21 22.6063 ~ 92 0
57 GOODS J033225.24-275226.6 G 03 32 25.23986 -27 52 26.5087   24.7116   24.744 24.4321 ~ 6 0
58 [LBX2017] 453 AGN 03 32 25.25 -27 52 30.7   27.15 27.00 27.01 26.581 ~ 44 0
59 [LBX2017] 460 AGN 03 32 25.73 -27 49 36.2   20.763   20.517 19.898 ~ 43 0
60 [VV2006] J033226.5-274036 QSO 03 32 26.4998939520 -27 40 35.910988680 20.34 20.0691   20.091 19.7666 ~ 81 0
61 CXOCDFS J033226.7-274013 AGN 03 32 26.69 -27 40 13.6   23.8628 23.80 23.826 23.4188 ~ 39 0
62 [VV2006] J033227.0-274105 QSO 03 32 27.0132796944 -27 41 05.357500044 19.93 19.3746   19.003 19.1163 ~ 93 1
63 GOODS-MUSIC 17746 G 03 32 27.188 -27 40 51.37   27.0239     25.2561 ~ 6 0
64 ACS-GC 90045964 Sy2 03 32 27.623 -27 41 44.91   24.0498 23.2945 22.252 21.6131 ~ 61 0
65 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1623 1
66 ACS-GC 90044310 rG 03 32 28.728 -27 46 20.16   24.3178 23.36 22.37 21.357 ~ 63 0
67 ATCDFS9 J033228.82-274355.9 rG 03 32 28.8228206208 -27 43 55.948028988   19.9493 18.861 18.383 18.3317 ~ 49 0
68 [VV2006] J033229.9-275106 Sy2 03 32 29.8487 -27 51 05.879   27.5675 25.05 23.970 24.5370 ~ 101 0
69 2MASX J03322988-2744244 EmG 03 32 29.8815679200 -27 44 25.025427456 19.55 17.6891 16.891 16.74 16.467 ~ 60 0
70 2XMM J033229.9-274528 Sy1 03 32 29.976 -27 45 29.77 21.66 21.1307 21.33 21.298 21.1036 ~ 80 1
71 ACS-GC 90043805 EmG 03 32 29.9856891480 -27 44 05.377841988 19.78 18.2213 17.419 17.236 17.0114 ~ 64 0
72 ACS-GC 90042078 Sy1 03 32 30.0611 -27 45 23.526 23.96 23.2871 23.0874 22.5697 22.010 ~ 70 0
73 ACS-GC 90042521 Sy1 03 32 30.2159 -27 45 04.590 23.17 22.5984 22.2969 21.958 21.7127 ~ 71 0
74 CXOCDFS J033231.4-274727 AGN 03 32 31.356 -27 47 24.94 22.8607 22.5513 21.80 21.463 21.176 ~ 57 0
75 ACS-GC 90045460 Sy2 03 32 31.462 -27 46 23.07 25.05 23.96 23.64 23.28 23.001 ~ 118 0
76 EIS-DEEP CDFS-2 J 1 329 AGN 03 32 32.0408 -27 44 51.735   25.2464   22.90 21.998 ~ 37 0
77 GEMS J033232.98-274117.1 AGN 03 32 32.984 -27 41 17.06   24.178   22.660 21.7520 ~ 36 0
78 ACS-GC 90043285 AGN 03 32 33.017 -27 42 00.39   25.7912   25.46 24.8672 ~ 33 0
79 2dFGRS TGS243Z010 AGN 03 32 33.4688676120 -27 43 13.077148332 23.25 19.0285   17.17 17.1209 ~ 32 1
80 CXOCDFS J033234.5-274351 Sy2 03 32 34.344 -27 43 50.10   24.3924   21.878 21.4358 ~ 46 0
81 EIS-DEEP CDFS-4 J 1 1465 rG 03 32 34.46119 -27 50 04.9430   24.2365 23.6020 24.084 23.667 ~ 30 0
82 ACS-GC 90040296 Sy2 03 32 34.947 -27 55 11.16   23.7556   22.920 22.1896 ~ 59 0
83 GOODS J033235.04-274932.6 G 03 32 35.0375 -27 49 32.640   25.1384   24.59 24.6538 ~ 16 0
84 ACS-GC 90042103 rG 03 32 35.103 -27 44 10.60   24.9342 24.00 23.80 24.0233 ~ 36 0
85 NAME BzK 4892 Sy2 03 32 35.73 -27 49 16.2   25.681 27.798 25.00 24.645 ~ 89 0
86 ACS-GC 90043479 rG 03 32 36.70 -27 44 06.1   22.732 23.6511 22.6377 20.548 ~ 72 0
87 ACS-GC 90042433 Sy1 03 32 37.45 -27 40 00.3   23.5237 22.9339 22.614 22.1550 ~ 53 0
88 ACS-GC 90041753 Sy2 03 32 37.75 -27 52 12.3   25.2146 24.717 24.68 24.1108 ~ 87 0
89 ACS-GC 90043401 Sy1 03 32 38.1232741056 -27 39 45.158278032 20.89 20.9342 20.511 20.4095 20.6297 ~ 69 0
90 CXOCDFS J033238.8-275122 AGN 03 32 38.7610 -27 51 21.621   27.7247   27.02 26.1466 ~ 45 0
91 ACS-GC 90043794 QSO 03 32 38.775 -27 47 32.14 22.0732 21.9232 21.497 20.968 21.1721 ~ 65 0
92 [VV2006] J033239.1-274602 QSO 03 32 39.0897389184 -27 46 02.044213860 21.11 21.413 21.157 20.68 20.812 ~ 82 0
93 CXOCDFS J033239.5-275032 AG? 03 32 39.4611 -27 50 31.809   25.1633 23.73 22.289 21.6414 ~ 34 0
94 CXOCDFS J033240.7-274926 AG? 03 32 40.752 -27 49 26.17   24.2478 24.339 23.905 23.381 ~ 39 0
95 EIS-DEEP CDFS-2 Ks 1 1978 G 03 32 41.405 -27 47 17.17 26.0967 24.2186 22.359 21.656 21.1531 ~ 43 0
96 [VV2006] J033241.9-275203 QSO 03 32 41.84 -27 52 02.3   24.3501 23.03 22.529 22.4031 ~ 68 1
97 CANDELS UDS F160W J033241.87-274359.9 AGN 03 32 41.87599 -27 43 59.9419   23.136   25.068 25.1361 ~ 44 0
98 CXOCDFS J033242.9-274703 Sy1 03 32 42.837 -27 47 02.53   25.6384 24.571 24.100 24.311 ~ 81 0
99 COMBO J0332433-274914 Sy1 03 32 43.25 -27 49 14.4 24.17 22.4055 22.6983 22.984 22.5427 ~ 74 0
100 CXOCDFS J033244.1-274636 AGN 03 32 44.007 -27 46 34.98 27.8096 25.0831 24.531 24.830 24.4864 ~ 53 0
101 CXOCDFS J033244.3-275142 Sy2 03 32 44.2735728504 -27 51 41.250103596 23.86 21.2637 20.4461 19.757 19.4818 ~ 56 0
102 [VV2006] J033244.4-275252 QSO 03 32 44.28 -27 52 51.0   25.0168   23.904 23.8566 ~ 51 0
103 CXOCDFS J033244.5-274819 EmG 03 32 44.432 -27 48 18.98   22.3138 21.5154 20.649 20.278 ~ 54 0
104 ACS-GC 90039808 Sy2 03 32 44.44 -27 49 39.8   25.4428 24.5909 23.8157 23.0180 ~ 62 0
105 CANDELS UDS F160W J033244.60-274835.9 QSO 03 32 44.599 -27 48 35.88   25.6176   25.070 24.7295 ~ 54 0
106 ATCDFS J033245.03-275438.8 AGN 03 32 45.0185 -27 54 39.582   20.7333 20.2459 19.5226 19.2920 ~ 42 0
107 CXOCDFS J033245.2-274724 EmG 03 32 45.107 -27 47 24.01 23.3276 22.7276 21.53 21.053 20.8410 ~ 72 0
108 [LBX2017] 832 G 03 32 45.6823 -27 55 34.403   20.7974 20.27 20.31 20.2613 ~ 19 0
109 ACS-GC 90040131 Sy2 03 32 46.41 -27 54 13.7   23.0602 21.86 20.683 19.9987 ~ 51 0
110 ATCDFS J033246.7-275120A rG 03 32 46.83 -27 51 20.8 24.82 24.4861 24.07 24.202 23.595 ~ 45 0
111 CXOCDFS J033247.3-275147 AGN 03 32 47.18561 -27 51 47.5445   24.4339 24.0967 23.724 22.721 ~ 38 0
112 ACS-GC 90039535 Sy2 03 32 48.18 -27 52 56.7   23.3386 22.3444 20.974 20.3029 ~ 59 0
113 ACS-GC 90040278 Sy1 03 32 52.89 -27 51 19.8   22.837   23.541 22.3247 ~ 56 0
114 CXOCDFS J033256.8-275318 QSO 03 32 56.6570292528 -27 53 16.624989096 20.82 20.5562   19.874 20.2611 ~ 49 0
115 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1

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