2015A&A...574A.112D


Query : 2015A&A...574A.112D

2015A&A...574A.112D - Astronomy and Astrophysics, volume 574A, 112-112 (2015/2-1)

Variability-selected active galactic nuclei in the VST-SUDARE/VOICE survey of the COSMOS field.

DE CICCO D., PAOLILLO M., COVONE G., FALOCCO S., LONGO G., GRADO A., LIMATOLA L., BOTTICELLA M.T., PIGNATA G., CAPPELLARO E., VACCARI M., TREVESE D., VAGNETTI F., SALVATO M., RADOVICH M., BRANDT W.N., CAPACCIOLI M., NAPOLITANO N.R. and SCHIPANI P.

Abstract (from CDS):

Active galaxies are characterized by variability at every wavelength, with timescales from hours to years depending on the observing window. Optical variability has proven to be an effective way of detecting AGNs in imaging surveys, lasting from weeks to years. In the present work we test the use of optical variability as a tool to identify active galactic nuclei in the VST multiepoch survey of the COSMOS field, originally tailored to detect supernova events. We make use of the multiwavelength data provided by other COSMOS surveys to discuss the reliability of the method and the nature of our AGN candidates. The selection on the basis of optical variability returns a sample of 83 AGN candidates; based on a number of diagnostics, we conclude that 67 of them are confirmed AGNs (81% purity), 12 are classified as supernovae, while the nature of the remaining 4 is unknown. For the subsample of AGNs with some spectroscopic classification, we find that Type 1 are prevalent (89%) compared to Type 2 AGNs (11%). Overall, our approach is able to retrieve on average 15% of all AGNs in the field identified by means of spectroscopic or X-ray classification, with a strong dependence on the source apparent magnitude (completeness ranging from 26% to 5%). In particular, the completeness for Type 1 AGNs is 25%, while it drops to 6% for Type 2 AGNs. The rest of the X-ray selected AGN population presents on average a larger rms variability than the bulk of non-variable sources, indicating that variability detection for at least some of these objects is prevented only by the photometric accuracy of the data. The low completeness is in part due to the short observing span: we show that increasing the temporal baseline results in larger samples as expected for sources with a red-noise power spectrum. Our results allow us to assess the usefulness of this AGN selection technique in view of future wide-field surveys.

Abstract Copyright:

Journal keyword(s): galaxies: active - X-rays: galaxies - quasars: general - supernovae: general - surveys

VizieR on-line data: <Available at CDS (J/A+A/574/A112): table3.dat>

Nomenclature: Table 3: [DPC2015] NN (Nos 1-83).

Simbad objects: 85

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Number of rows : 85
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2093 1
2 [DPC2015] 12 SN* 09 58 34.30 +01 51 36.6           ~ 2 0
3 [VV2006] J095844.9+014309 QSO 09 58 44.9415645384 +01 43 09.007001652   20.77 20.42   20.36 ~ 58 0
4 [DPC2015] 2 SN* 09 58 49.50 +01 42 20.7           ~ 2 0
5 SDSS J095849.51+021640.4 AGN 09 58 49.518 +02 16 40.46   21.9625 21.5741   20.79 ~ 25 0
6 COSMOS2015 945260 G 09 58 54.30 +02 44 13.5 24.11 24.03 23.46 23.14 22.90 ~ 4 0
7 SDSS J095906.69+023402.2 AGN 09 59 06.69840 +02 34 02.2908         21.38 ~ 22 0
8 [CBP2015] cosmos r 20120216 2A SN* 09 59 07.10 +01 42 56.3           ~ 3 0
9 ACS-GC 20155847 AGN 09 59 08.55 +02 33 17.2   23.5234 23.0877   22.639 ~ 27 0
10 ACS-GC 20155800 AGN 09 59 11.0811438888 +02 33 50.808718260   21.3534 20.9985   20.834 ~ 19 0
11 [DPC2015] 72 SN* 09 59 12.70 +02 06 57.9           ~ 2 0
12 SDSS J095913.90+023844.4 AGN 09 59 13.906 +02 38 44.47   21.8312 21.6938   21.89 ~ 27 0
13 COSMOS2015 280576 AGN 09 59 13.912 +01 42 33.31 23.096 22.68 22.25 22.11 21.752 ~ 11 0
14 SDSS J095919.82+024238.6 QSO 09 59 19.8252374448 +02 42 38.614294800   21.278 21.399   20.935 ~ 41 0
15 [DPC2015] 33 SN* 09 59 21.10 +02 05 33.2           ~ 2 0
16 [VV2006] J095934.8+021422 QSO 09 59 34.8959878104 +02 14 22.107744636   20.958 20.7253   20.85 ~ 33 0
17 2XMM J095935.5+020537 QSO 09 59 35.501 +02 05 38.20   22.2112 22.1366   21.73 ~ 34 0
18 2XMM J095938.9+021201 Sy1 09 59 38.9858958912 +02 12 01.156902732 21.48 20.9639 20.6938   20.43 ~ 44 0
19 ACS-GC 20069978 AGN 09 59 41.41 +01 58 45.3   22.5527 22.0362   22.459 ~ 27 0
20 ACS-GC 20069702 AGN 09 59 41.52 +02 01 36.8 23.74 23.2463 22.8585 22.84 22.78 ~ 22 0
21 2XMM J095946.9+022208 QSO 09 59 46.9227404784 +02 22 09.358553892   21.2705 20.6555   21.01 ~ 34 0
22 2XMM J095949.8+020012 QSO 09 59 49.848 +02 00 11.08   21.4169 21.0154   21.03 ~ 34 0
23 [CBP2015] cosmos r 20120226 59A SN* 09 59 51.00 +02 19 01.9           ~ 3 0
24 [VV2006] J095957.9+014327 QSO 09 59 57.9803916936 +01 43 27.405543360   20.4504 20.1489   19.989 ~ 66 0
25 SDSS J095958.47+021530.8 AGN 09 59 58.474 +02 15 30.84   21.2843 20.9745   19.973 ~ 41 0
26 [VV2006] J095958.6+021805 QSO 09 59 58.5352330248 +02 18 05.143568796   20.7067 20.349   20.12 ~ 38 0
27 COSMOS 1302712 QSO 09 59 58.868 +02 00 23.87   22.8927 22.2822   21.81 ~ 26 0
28 SDSS J100002.01+024216.3 AGN 10 00 02.018 +02 42 16.31   22.2967 21.5109   20.88 ~ 27 0
29 SDSS J100006.84+021235.6 AGN 10 00 06.847 +02 12 35.66   22.5306 21.842   21.612 ~ 29 0
30 [VV2006] J100010.2+023745 QSO 10 00 10.1929960488 +02 37 44.996406168   21.2191 20.744   20.21 ~ 31 0
31 ACS-GC 20180162 AGN 10 00 10.85 +02 41 18.8   23.4816 23.1153   22.893 ~ 22 0
32 2XMM J100012.1+014439 QSO 10 00 12.087 +01 44 39.91 22.61 22.063 22.111   21.74 ~ 34 0
33 ACS-GC 20178154 AGN 10 00 14.05 +02 43 49.3   21.9846 21.5212   21.392 ~ 11 0
34 SDSS J100014.91+022718.1 AGN 10 00 14.914 +02 27 18.14 21.894 21.624 21.172 21.284 20.836 ~ 33 0
35 SDSS J100017.53+020012.5 AGN 10 00 17.533 +02 00 12.58 22.484 21.9275 21.3263 21.087 20.728 ~ 36 0
36 COSMOS 1619221 AG? 10 00 20.651 +02 12 34.97 23.187 22.76 21.87 21.709 21.340 ~ 14 0
37 [DPC2015] 69 SN* 10 00 20.80 +02 43 57.4           ~ 2 0
38 SDSS J100025.32+020734.7 AGN 10 00 25.328 +02 07 34.70   22.1937 21.4948   21.73 ~ 27 0
39 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2981 0
40 [VV2006] J100031.6+014757 QSO 10 00 31.6153401336 +01 47 57.808703760   21.266 21.1055   20.90 ~ 38 0
41 [VV2006] J100033.4+015237 QSO 10 00 33.3873091176 +01 52 37.081235388   20.955 20.678   20.392 ~ 39 0
42 [VV2006] J100038.0+020822 QSO 10 00 38.0145823704 +02 08 22.399120716   20.698 20.617   20.45 ~ 63 0
43 COSMOS2015 464704 G 10 00 41.48 +02 00 14.9 24.34 24.15 23.20 22.93 22.66 ~ 4 0
44 [VV2006] J100047.8+020756 QSO 10 00 47.7541645248 +02 07 56.997161220   19.50 19.30   19.49 ~ 49 0
45 2XMM J100049.9+015230 QSO 10 00 49.9700230056 +01 52 31.197934056   21.0559 20.5266   20.579 ~ 35 0
46 [VV2006] J100055.6+022150 QSO 10 00 55.6277266344 +02 21 50.380395192   20.8269 20.5506   20.58 ~ 28 0
47 [VV2006] J100058.8+015400 QSO 10 00 58.8426061536 +01 54 00.208903968   20.3763 20.1944   20.008 ~ 68 0
48 2XMM J100108.5+020053 QSO 10 01 08.547 +02 00 52.43   21.3345 20.8779   20.95 ~ 34 0
49 [DPC2015] 30 SN* 10 01 11.00 +02 02 26.4           ~ 2 0
50 SDSS J100114.85+020208.4 QSO 10 01 14.857 +02 02 08.47   22.0742 21.2343   20.71 ~ 45 0
51 2XMM J100116.2+023607 QSO 10 01 16.290 +02 36 07.55   21.4777 20.6806   20.880 ~ 35 0
52 SDSS J100118.58+022739.1 QSO 10 01 18.5781815208 +02 27 39.140085600   20.959 20.596   20.038 ~ 37 0
53 [VV2006] J100120.2+020341 QSO 10 01 20.2480460760 +02 03 41.226019776   20.6423 20.1335   20.41 ~ 33 0
54 [VV2006] J100120.2+023341 QSO 10 01 20.2641138936 +02 33 41.327099676   20.6106 20.1906   20.08 ~ 71 0
55 COSMOS2015 623908 QSO 10 01 23.9774859264 +02 14 45.919643640   22.629 21.881   21.670 ~ 33 0
56 ACS-GC 20033709 AGN 10 01 24.74 +01 57 38.8   22.1955 21.6394   21.766 ~ 26 0
57 [VV2006] J100129.7+020643 QSO 10 01 29.6700868944 +02 06 43.285011372   21.51 21.27   20.95 ~ 33 0
58 ACS-GC 20171642 AGN 10 01 31.88 +02 43 25.2   22.5267 22.4981   22.176 ~ 23 0
59 COSMOS2015 920455 G 10 01 32.63 +02 41 49.9 23.70 23.68 23.37 23.21 22.68 ~ 4 0
60 [DPC2015] 78 AG? 10 01 32.70 +02 32 33.8           ~ 2 0
61 2XMM J100136.2+015442 QSO 10 01 36.231 +01 54 43.02   21.2025 20.7841   21.013 ~ 28 0
62 ACS-GC 20142119 AGN 10 01 37.69 +02 28 44.0   22.853 22.186   21.326 ~ 24 0
63 ACS-GC 20056888 QSO 10 01 40.400 +02 05 06.52 22.47 21.6901 20.7358   19.99 ~ 36 0
64 2XMM J100141.3+021031 QSO 10 01 41.340 +02 10 31.32   21.4017 20.726   20.541 ~ 34 0
65 ACS-GC 20058793 QSO 10 01 41.42 +02 00 51.1 22.258 22.35 21.6944 22.12 21.807 ~ 33 0
66 2XMM J100143.4+015606 QSO 10 01 43.443 +01 56 06.85   21.5402 21.1378   20.969 ~ 31 0
67 [VV2006] J100145.1+022456 QSO 10 01 45.1570983216 +02 24 56.903932368   20.778 20.3897   20.440 ~ 60 0
68 SDSS J100147.04+020236.5 AGN 10 01 47.051 +02 02 36.56   22.018 21.2382   21.14 ~ 27 0
69 ACS-GC 20009732 AGN 10 01 47.40 +01 41 44.5   22.2095 21.707   21.754 ~ 8 0
70 [VV2006] J100147.9+021446 QSO 10 01 47.9050183272 +02 14 47.087964204   20.7508 20.2766   20.485 ~ 34 0
71 [DPC2015] 77 AG? 10 01 48.20 +02 31 02.8           ~ 2 0
72 ACS-GC 20141779 AGN 10 01 48.86 +02 31 40.5   21.8349 21.442   21.386 ~ 22 0
73 [DPC2015] 80 AG? 10 01 53.20 +02 36 12.1           ~ 2 0
74 ACS-GC 20084352 AGN 10 01 56.25 +02 09 43.3   22.4623 22.4187   22.126 ~ 32 0
75 [VV2006] J100159.5+023935 QSO 10 01 59.4219270984 +02 39 35.658657576   21.102 20.6617   20.43 ~ 35 0
76 ACS-GC 20169886 AGN 10 02 01.31 +02 40 29.7   23.4731 22.9188   23.078 ~ 20 0
77 SDSS J100202.22+024157.8 AGN 10 02 02.223 +02 41 57.84   21.521 21.357   21.14 ~ 27 0
78 [VV2006] J100202.8+022434 QSO 10 02 02.7744155544 +02 24 34.595331228   20.4499 19.9723 20.11 20.33 ~ 63 0
79 SDSS J100208.54+014553.5 AGN 10 02 08.546 +01 45 53.58   21.505 21.529   21.166 ~ 25 0
80 SDSS J100212.10+014232.1 AGN 10 02 12.1071083064 +01 42 32.214521088   21.100 20.964   20.135 ~ 24 0
81 [DPC2015] 55 SN* 10 02 15.30 +02 32 10.0           ~ 2 0
82 SDSS J100217.97+015836.1 AGN 10 02 17.973 +01 58 36.18   22.2182 21.8659   21.444 ~ 27 0
83 [VV2006] J100219.5+015537 QSO 10 02 19.4932576296 +01 55 37.011633780   21.160 21.027   20.410 ~ 57 0
84 SDSS J100223.04+014714.8 AGN 10 02 23.047 +01 47 14.85   22.03 21.31   21.39 ~ 31 0
85 ACS-GC 20136462 AGN 10 02 23.364 +02 37 04.53   22.2031 21.9081   21.75 ~ 26 0

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