2020MNRAS.499.1005W

Query : 2020MNRAS.499.1005W

2020MNRAS.499.1005W - Mon. Not. R. Astron. Soc., 499, 1005-1022 (2020/November-3)

SkyMapper colours of Seyfert galaxies and Changing-Look AGN.

WOLF C., GOLDING J., HON W.J. and ONKEN C.A.

Abstract (from CDS):

We study the utility of broad-band colours in the SkyMapper Southern Survey for selecting Seyfert galaxies at low luminosity. We find that the u - v index, built from the ultraviolet u and violet v filters, separates normal galaxies, starburst galaxies, and type-1 active galactic nuclei (AGNs). This u - v index is not sensitive to age or metallicity in a stellar population but is instead a quenching-and-bursting indicator in galaxies and detects power-law continua in type-1 AGNs. Using over 25 000 galaxies at z < 0.1 from 6dFGS, we find a selection cut based on u - v and central u band brightness that identifies type-1 AGNs. By eyeballing 6dFGS spectra we classify new Seyfert galaxies of type 1 to 1.8. Our sample includes eight known Changing-Look AGNs (CLAGNs), two of which show such strong variability that they move across the selection cut during the 5 yr of SkyMapper observations in DR3, along mixing sequences of nuclear and host galaxy light. We identify 46 CLAGN candidates in our sample, one of which has been reported as a Type IIn supernova. We show that this transient persists for at least 5 yr and marks a flare in a Seyfert-1 period of a new CLAGN.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: observational - surveys - galaxies: evolution - galaxies: Seyfert

Simbad objects: 62

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Number of rows : 62
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 2dFGRS TGS134Z305 * 00 00 43.9222634856 -26 05 21.343155432   17.665   16.403   ~ 5 0
2 LEDA 1040986 Sy1 00 16 37.9075028232 -05 44 24.906257448   16.96   15.78   ~ 8 0
3 AM 0038-372 Sy1 00 40 39.1705271304 -37 13 16.808613348   16.30       ~ 13 0
4 LEDA 132852 G 01 15 27.4107670800 -31 23 52.139849100   16.300   15.191   ~ 6 0
5 LEDA 683308 G 01 19 06.6804615240 -32 57 13.015071792   17.392   16.236   ~ 6 0
6 Z 387-34 Sy1 02 06 15.9896281128 -00 17 29.221733688   15.90 15.50 10.3   ~ 405 0
7 NGC 863 Sy2 02 14 33.5604714720 -00 46 00.181845336   14.48 13.81 17.9   ~ 770 0
8 LEDA 132951 Sy1 02 25 36.3439036752 -27 30 47.729568384   16.251   15.100   ~ 9 0
9 SDSS J024545.49-030449.6 QSO 02 45 45.5014952856 -03 04 49.708158564   17.82   16.93   ~ 5 0
10 PB 9402 Sy1 02 57 50.2700333184 -13 37 19.597348992   17.10   16.02   ~ 6 0
11 Mrk 609 Sy2 03 25 25.3590639624 -06 08 37.947546528   14.72 14.12 10.9   ~ 212 0
12 NGC 1346 Sy1 03 30 13.2634890840 -05 32 35.991525660   17.06 16.39 12.58   ~ 63 1
13 LEDA 1043483 Sy1 03 58 20.0889462600 -05 32 06.581717268   17.05   15.65   ~ 15 0
14 NGC 1566 Sy1 04 20 00.3968473248 -54 56 16.624708764 10.29 10.19 9.73 9.21 10.1 ~ 1051 2
15 LEDA 3094074 EmG 04 28 39.9497615760 -18 41 22.326467208   17.15   16.16   ~ 5 0
16 NVSS J042938-210942 Sy1 04 29 38.3097451320 -21 09 43.894237644   16.20       ~ 31 1
17 ESO 360-17 Sy1 04 35 57.7211351976 -35 58 57.495437112   16.27   14.94   ~ 8 0
18 LEDA 578275 Sy1 04 40 40.3487501712 -41 10 43.719488256   17.28   15.93   ~ 8 0
19 ESO 253-3 Sy2 05 25 18.058 -46 00 21.36 15.95 15.10 14.77 13.95   ~ 80 0
20 ASASSN -14ko ev 05 25 18.13 -46 00 20.3           SNIIn 84 0
21 LEDA 178481 Sy1 05 27 20.8236458112 -19 54 11.033281656   16.58   15.35   ~ 7 0
22 LEDA 668116 Sy2 05 29 59.2065609648 -34 01 58.536778656   16.85   15.59   ~ 6 0
23 LEDA 846358 EmG 05 51 17.9721549576 -20 05 47.442253812   17.05   15.96   ~ 5 0
24 ESO 365-5 EmG 06 18 45.253 -35 18 14.58   14.61   13.44   ~ 19 0
25 LEDA 550522 Sy1 06 41 57.6919844304 -43 17 42.105499944   16.30   15.27   ~ 6 0
26 LEDA 613252 Sy1 06 50 17.4674415456 -38 05 13.448223780   16.18   14.69   ~ 18 0
27 LEDA 149256 Sy1 06 56 54.2502479496 -63 15 35.271940788   16.18   14.56   ~ 8 0
28 2MASS J08025394-5821372 Sy1 08 02 53.9542685304 -58 21 37.182898728   18.04   16.59   ~ 4 0
29 LEDA 152500 Sy1 08 27 34.1427141384 -02 12 46.743326928   15.89   14.59   ~ 8 0
30 NGC 2617 Sy2 08 35 38.7981089496 -04 05 17.901104280   13.6   12.63 13.2 ~ 226 0
31 LEDA 965352 Sy1 09 41 11.5362109896 -11 28 22.390579056   16.75   15.49   ~ 4 0
32 2MASX J09451259-1236317 EmG 09 45 12.5667071904 -12 36 31.582744416   16.49   15.31   ~ 7 0
33 LEDA 3081667 Sy1 09 54 02.5430404416 -34 13 42.613962168   16.38   15.38   ~ 9 0
34 LEDA 735527 Sy1 10 14 11.4329682936 -28 56 31.201438776   17.48   16.20   ~ 6 0
35 6dFGS gJ104745.7-375932 Sy1 10 47 45.7026760560 -37 59 31.985601252   17.04   16.02   ~ 4 0
36 2MASS J10483382-3902379 Sy1 10 48 33.8276094480 -39 02 38.043647556   17.05   15.89   ~ 23 0
37 LEDA 156004 Sy1 10 53 40.9838845704 -29 18 23.977105596   15.8       ~ 5 0
38 Z 11-12 G 11 09 41.5201464576 -03 39 26.730213660   13.8   14.701   ~ 14 1
39 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1286 1
40 CTS 13 Sy1 12 48 21.2 -27 25 50   15.5   15.8   ~ 10 0
41 EC 12476-2317 AGN 12 50 18.90 -23 33 57.6   16.29 15.46     ~ 72 0
42 2MASS J13283109-4909060 Sy1 13 28 31.0831642992 -49 09 06.053282856   17.48   16.20   ~ 7 0
43 LEDA 593407 Sy1 13 43 43.1130510576 -39 50 32.152094628   17.20   15.98   ~ 6 0
44 LEDA 4076282 Sy1 13 53 29.6356186680 -43 41 43.500097536   16.06   15.01   ~ 9 0
45 EC 14040-2428 rG 14 06 50.7257026008 -24 42 49.880637720   16.94 15.99 15.77 15.16 ~ 9 0
46 2MASS J14072198-3120576 Sy1 14 07 21.9899114184 -31 20 57.691674384   17.28   16.04 15.41 ~ 7 0
47 LEDA 991676 Sy1 14 23 50.2470931440 -09 23 17.328513156   17.35   16.47   ~ 7 0
48 LEDA 757022 Sy1 14 37 45.6617547624 -27 18 03.289240944   17.12   15.95   ~ 5 0
49 LEDA 926539 Sy1 15 30 39.4983501912 -14 17 11.579784144   16.79   15.50   ~ 7 0
50 LEDA 891997 Sy1 15 52 43.7703444624 -16 53 40.961948604   17.22   15.88   ~ 6 0
51 NVSS J161143-343530 rG 16 11 43.5213784752 -34 35 28.645545336   17.59   15.83   ~ 5 1
52 6dFGS gJ162318.9-301433 Sy1 16 23 18.9299919192 -30 14 33.352054584   18.26   16.87   ~ 3 0
53 LEDA 1117619 Sy1 16 39 00.0466441848 -01 28 57.287552736   17.66   16.32   ~ 5 0
54 LEDA 282628 Sy1 17 29 16.2876696720 -68 54 41.395605120   16.80   15.30   ~ 8 0
55 LEDA 207716 Sy1 18 39 35.852 -35 41 23.38   16.91   15.33   ~ 9 0
56 LEDA 3082923 Sy1 20 22 08.8326260208 -47 14 51.367454340   17.14   15.71   ~ 5 0
57 LEDA 3923571 Sy1 20 25 57.3772371624 -48 22 26.158035828   15.71   14.93   ~ 9 0
58 LEDA 443603 Sy1 21 10 33.1794735000 -52 27 43.871752872   16.64   15.31   ~ 5 0
59 LEDA 958725 Sy1 21 47 13.2707371056 -12 01 25.749508728   17.06   15.73   ~ 5 0
60 ESO 467-41 Sy1 22 18 21.1421876496 -30 04 47.142511572   16.15   15.16   ~ 8 0
61 NGC 7582 Sy2 23 18 23.60 -42 22 13.3 11.62 10.92 10.62     ~ 978 3
62 NGC 7603 Sy1 23 18 56.6538277656 +00 14 37.977066096   14.73 14.01     ~ 438 0

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