2022MNRAS.511...54H

Query : 2022MNRAS.511...54H

2022MNRAS.511...54H - Mon. Not. R. Astron. Soc., 511, 54-70 (2022/March-3)

SkyMapper colours of Seyfert galaxies and changing-look AGN - II. Newly discovered changing-look AGN.

HON W.J., WOLF C., ONKEN C.A., WEBSTER R. and AUCHETTL K.

Abstract (from CDS):

Changing-look active galactic nuclei (CLAGN) are AGN that change type as their broad emission lines appear or disappear, which is usually accompanied by strong flux changes in their blue featureless continuum. We search for turn-on CLAGN by selecting type-2 AGN from the spectroscopic Six-degree Field Galaxy Survey (6dFGS), whose colours, observed ∼15 yr later by the SkyMapper Southern Survey, are suggestive of type-1 AGN. Starting from 1092 type-2 AGN, we select 20 candidates for follow-up and confirm that 14 of them have changed into type-1 and are thus turn-on CLAGN; further observations reveal 11 more turn-on CLAGN. While our search was not tailored to efficiently discover turn-off CLAGN, we discover two such cases as well. The result suggests a turn-on CLAGN rate of over 3 per cent over ∼15 yr and imply a total CLAGN rate of more than ∼6 per cent over this period. Finally, we present observations of AGN that are atypical for the CLAGN phenomenology, including J1109146 - a type-1 that did not appear as an AGN at all in 6dFGS; J1406507 - the second reported changing-look narrow-line Seyfert 1; and J1340153 - a CLAGN with a change time-scale of 3 months.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: active - quasars: emission lines - quasars: general - galaxies: Seyfert

Simbad objects: 46

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Number of rows : 46
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 MCG-01-01-043 Sy1 00 10 09.9800222568 -04 42 37.925414892   14.5 13.8 14.6   ~ 63 0
2 LEDA 946 Sy1 00 14 18.1375026120 -05 19 05.018024964   16.76   15.68   ~ 6 0
3 LEDA 1014434 Sy1 00 40 52.8045010848 -07 42 08.646039216   16.20 16.5 14.98   ~ 16 0
4 LEDA 133691 Sy1 00 41 32.0632282320 -22 38 37.462340544   16.33 13.24 11.9   ~ 15 0
5 LEDA 519854 Sy1 01 30 21.2982350832 -46 01 44.946189084   17.44   15.99   ~ 21 0
6 2MASS J01580475-0052221 Sy1 01 58 04.7506373016 -00 52 21.927742716   18.84 18.34     SNII 114 1
7 Z 387-34 Sy1 02 06 15.9896281128 -00 17 29.221733688   15.90 15.50 10.3   ~ 405 0
8 LEDA 845189 G 02 47 34.5609912984 -20 11 00.150695700   16.53   15.46   ~ 5 0
9 LEDA 265292 Sy2 02 48 34.4587983840 -72 08 30.693098508   17.21   15.91   ~ 4 0
10 LEDA 3095628 Sy1 03 13 24.8325783960 -35 06 26.246559816   17.12 16.5 16.30   ~ 18 0
11 LEDA 74977 Sy1 03 45 12.5298087360 -39 34 29.275394988   15.55 14.83 14.531   ~ 56 0
12 LEDA 846513 Sy1 04 54 34.1075849256 -20 05 07.081218384   16.09   15.10   ~ 7 0
13 ESO 552-39 Sy1 04 58 40.3117447128 -21 59 30.931989612   16.31 16.3 15.10   ~ 16 0
14 MCG-05-13-017 Sy2 05 19 35.8118941104 -32 39 27.923120568   13.81 13.37 12.73   ~ 274 1
15 LEDA 645411 G 06 12 38.6418290376 -35 43 07.304913156   16.64   15.43   ~ 6 0
16 LEDA 734640 Sy1 06 13 24.2890613664 -29 00 22.782328668   16.06   14.76   ~ 11 0
17 NGC 2617 Sy2 08 35 38.7981089496 -04 05 17.901104280   13.6   12.63 13.2 ~ 226 0
18 2MASS J09172721-6456270 Sy2 09 17 27.2154480336 -64 56 26.974814820   17.80   16.77   ~ 26 0
19 ESO 372-25 Sy1 09 26 48.3451989936 -36 26 08.496488328   16.52   15.12   ~ 14 0
20 1RXS J100848.8-095442 Sy2 10 08 48.5916291744 -09 54 50.888985480   15.98   14.85   ~ 35 0
21 [DDM2009] CSS100217 J102913+404220 SN* 10 29 13.0 +40 42 20           SNIIn 39 0
22 LEDA 945554 G 11 09 14.6012665296 -12 55 53.476098024   15.98   14.69   ~ 6 0
23 2MASS J12335916+0842112 Sy1 12 33 59.1295650552 +08 42 11.643750684   19.21 18.71     ~ 19 0
24 Z 244-33 Sy1 12 36 51.1771780656 +45 39 04.167368784   17.64 17.16     ~ 91 0
25 ESO 443-5 Sy1 12 54 24.8031645480 -28 26 31.807073616   15.42   14.81 14.96 ~ 29 0
26 LEDA 1052095 Sy1 13 40 15.3526890504 -04 53 31.483189032   16.92   15.78   ~ 6 0
27 EC 14040-2428 rG 14 06 50.7257026008 -24 42 49.880637720   16.94 15.99 15.77 15.16 ~ 9 0
28 NVSS J151338-344053 rG 15 13 38.7784093824 -34 40 40.720127268   16.99   15.37   ~ 5 0
29 LEDA 225607 Sy1 15 14 41.9567366280 -81 23 38.013343188   17.30   15.83   ~ 50 0
30 LEDA 3098145 Sy1 15 14 48.7031645160 -40 21 53.177870916   15.49   14.32   ~ 17 0
31 Z 22-21 Sy2 15 38 44.7635952480 -03 22 48.115054200   15.8   11.6   ~ 44 1
32 6dFGS gJ172134.2-544315 Sy2 17 21 34.1881975656 -54 43 15.240725580   17.23   15.89   ~ 3 0
33 6dFGS gJ182452.5-432858 Sy1 18 24 52.4897442432 -43 28 57.909064044   17.45   15.97   ~ 3 0
34 LEDA 207716 Sy1 18 39 35.852 -35 41 23.38   16.91   15.33   ~ 9 0
35 LEDA 3904185 Sy1 19 06 08.7486107016 -48 50 27.292840656   15.23   14.02   ~ 13 0
36 LEDA 90341 Sy1 19 49 09.2706613872 -10 34 25.050409392   15.17   14.18   ~ 33 0
37 6dFGS gJ194913.7-184716 Sy1 19 49 13.7182459944 -18 47 15.451477332   18.76   17.37   ~ 5 0
38 LEDA 161815 Sy2 19 58 56.4 -42 22 29   16.64   15.49   ~ 4 0
39 LEDA 165838 Sy2 20 07 51.2992328352 -11 08 34.363961448   15.68   14.40   ~ 44 0
40 LEDA 3082971 G 20 37 59.8969124736 -50 23 33.472028796   16.52   15.22   ~ 7 0
41 Z 374-12 Sy1 20 46 44.5971081048 -01 22 07.764617892   15.3       ~ 20 0
42 LEDA 163039 Sy1 21 17 41.6501751840 -02 08 33.764828964   16.71   15.67   ~ 19 1
43 LEDA 3096649 Sy1 21 55 31.8651218208 -20 51 32.926224384   16.79 16.68 15.50   ~ 10 0
44 LEDA 164503 Sy2 23 09 19.2162548160 -32 29 57.579015480   16.769   15.631   ~ 13 0
45 NGC 7603 Sy1 23 18 56.6538277656 +00 14 37.977066096   14.73 14.01     ~ 438 0
46 MCG-01-59-027 Sy1 23 30 32.3191944504 -02 27 45.144490464   15.68 14.86 13.39 13.5 ~ 85 0

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