2022MNRAS.513L..57L

Query : 2022MNRAS.513L..57L

2022MNRAS.513L..57L - Mon. Not. R. Astron. Soc., 513, L57-L62 (2022/June-2)

Confirming new changing-look AGNs discovered through optical variability using a random forest-based light-curve classifier.

LOPEZ-NAVAS E., MARTINEZ-ALDAMA M.L., BERNAL S., SANCHEZ-SAEZ P., AREVALO P., GRAHAM M.J., HERNANDEZ-GARCIA L., LIRA P. and ROJAS LOBOS P.A.

Abstract (from CDS):

Determining the frequency and duration of changing-look (CL) active galactic nuclei (AGNs) phenomena, where the optical broad emission lines appear or disappear, is crucial to understand the evolution of the accretion flow around supermassive black holes. We present a strategy to select new CL candidates starting from a spectroscopic type 2 AGN sample and searching for current type 1 photometric variability. We use the publicly available Zwicky Transient Facility alert stream and the Automatic Learning for the Rapid Classification of Events light-curve classifier to produce a list of CL candidates with a highly automated algorithm, resulting in 60 candidates. Visual inspection reduced the sample to 30. We performed new spectroscopic observations of six candidates of our clean sample, without further refinement, finding the appearance of clear broad Balmer lines in four of them and tentative evidence of type changes in the remaining two, which suggests a promising success rate of >=66 per cent for this CL selection method.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - galaxies: active - galaxies: emission lines

Simbad objects: 61

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Number of rows : 61
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 SDSS J001014.87+000820.7 Sy2 00 10 14.8752123504 +00 08 20.799940020   19.25 18.58     ~ 10 0
2 LEDA 1863752 AGN 00 13 45.7 +29 21 30           ~ 2 0
3 SDSS J004450.01-080332.7 AGN 00 44 50.01471 -08 03 32.7999           ~ 1 0
4 SDSS J011311.82+013542.4 QSO 01 13 11.8192801488 +01 35 42.451926684           ~ 10 0
5 LEDA 1082593 AGN 02 54 50.3 -02 47 52           ~ 3 0
6 2MASX J07554435+1923367 Sy2 07 55 44.3547362328 +19 23 36.365426304           ~ 7 0
7 2MASX J08124075+0715280 Sy2 08 12 40.7612117568 +07 15 28.585538784           ~ 6 0
8 2MASX J08191752+3019354 Sy2 08 19 17.5032815376 +30 19 35.712865560           ~ 5 0
9 SDSS J082250.41+154025.8 AGN 08 22 50.42049 +15 40 25.8649           ~ 3 0
10 2MASS J08322428+3551357 Sy2 08 32 24.2890250664 +35 51 35.895241188   17.77 17.07     ~ 6 0
11 SDSS J084149.39-001031.5 AGN 08 41 49.3865347624 -00 10 31.525652195           ~ 8 0
12 SDSS J084933.71+034049.6 AGN 08 49 33.7198690504 +03 40 49.663229739           ~ 4 0
13 SDSS J085005.93+554211.4 QSO 08 50 05.9221146264 +55 42 11.432704104           ~ 7 0
14 SDSS J094713.28+121220.1 AGN 09 47 13.28867 +12 12 20.1681           ~ 2 0
15 Z 182-38 Sy2 09 55 52.5424694160 +35 57 56.190236184   15.7       ~ 29 0
16 2MASS J10134276+5525557 Sy1 10 13 42.7966818936 +55 25 55.915980420   18.74 18.09     ~ 4 0
17 SDSS J102425.19+373903.0 Sy2 10 24 25.1964770280 +37 39 03.044975400           ~ 6 0
18 2MASX J10293582+2446397 Sy2 10 29 35.8198185864 +24 46 39.347846904           ~ 5 0
19 2MASS J10295991+4829376 Sy2 10 29 59.9586859488 +48 29 38.001336324   19.00 18.58     ~ 20 0
20 Z 290-67 AGN 10 44 38.2138889112 +56 22 10.822011312   15.1       ~ 38 0
21 LEDA 1410368 AGN 10 59 15.7933160304 +12 29 00.190269060           ~ 4 0
22 SDSS J111829.64+320400.0 QSO 11 18 29.6473927584 +32 03 59.992883640           ~ 12 0
23 LEDA 94170 Sy2 11 20 08.6804450544 +34 18 45.823964688   16.76       ~ 14 0
24 SDSS J112939.07+365300.9 AGN 11 29 39.07404 +36 53 00.9829           ~ 4 0
25 2dFGRS TGN238Z244 Sy2 11 39 44.3575055304 -01 43 38.723593728   18.198   17.172   ~ 7 0
26 2MASX J11514053+1202119 Sy2 11 51 40.5583761984 +12 02 12.183951948           ~ 10 0
27 SDSS J120045.49+145803.6 AGN 12 00 45.49146 +14 58 03.6745           ~ 3 0
28 LEDA 2128024 Sy2 12 01 41.4303873288 +38 28 21.554637744           ~ 6 0
29 2MASX J12034924+6053175 Sy2 12 03 49.2357991320 +60 53 17.490822900           ~ 9 0
30 SDSS J120459.00+153513.8 AGN 12 04 59.00160 +15 35 13.8161           ~ 3 0
31 ZTF20aakreaa AGN 12 06 05.5960202044 +42 10 11.570856464           ~ 3 0
32 SDSS J121835.58+184618.1 AGN 12 18 35.58297 +18 46 18.1202           ~ 2 0
33 SDSS J122026.75+363327.8 Sy2 12 20 26.7514335072 +36 33 27.861957864           ~ 5 0
34 LEDA 3789415 Sy2 12 27 37.7768259504 +08 44 06.781377696           ~ 7 0
35 SDSS J124617.33+282033.8 Sy2 12 46 17.3414245824 +28 20 33.771368256           ~ 10 0
36 LEDA 1276300 AGN 13 11 16.6078395600 +04 58 54.577798788           ~ 6 0
37 2MASX J13113064+3152013 Sy2 13 11 30.6538466208 +31 52 00.875294832   16 15.83     ~ 17 0
38 2MASS J13175606+4915312 Sy2 13 17 56.0681611560 +49 15 31.180544280           ~ 6 0
39 LEDA 3481576 Sy2 13 18 58.8511703688 +57 30 06.588058284           ~ 5 0
40 2MASX J13204524-0024497 Sy2 13 20 45.2546831544 -00 24 49.575688452   19.82 18.96 17.349   ~ 23 0
41 2MASX J13255874+1512579 Sy2 13 25 58.7033835816 +15 12 58.007917188           ~ 3 0
42 SDSS J132935.85-013034.0 AGN 13 29 35.8560721115 -01 30 34.048519773   18.556   17.395   ~ 6 0
43 LEDA 2091226 AGN 13 41 48.7914800256 +37 00 47.130421068           ~ 7 0
44 LEDA 3483532 Sy2 13 48 51.1030092528 +57 38 48.548276880           ~ 6 0
45 SDSS J135007.69+124657.3 Sy2 13 50 07.69852 +12 46 57.3910           ~ 4 0
46 LEDA 2310656 Sy2 14 27 01.5000191856 +48 06 32.845860432           ~ 11 0
47 [VV2006] J143458.1+504118 QSO 14 34 58.0315495872 +50 41 18.731663016   19.49 19.22     ~ 28 0
48 2MASS J14475423+2833238 Sy2 14 47 54.2351273256 +28 33 24.089545188           ~ 17 0
49 2MASX J15300654+0710203 Sy2 15 30 06.5185246536 +07 10 20.163667836           ~ 3 0
50 SDSS J153832.66+460734.9 AGN 15 38 32.6651162016 +46 07 34.930443252           ~ 5 0
51 SDSS J155259.94+210246.8 AGN 15 52 59.94170 +21 02 46.8782           ~ 4 0
52 Z 108-158 AGN 16 08 45.2324585184 +16 45 33.439291920   15.4       ~ 51 0
53 2MASX J16121963+4629430 Sy2 16 12 19.5666849552 +46 29 42.609414444           ~ 5 0
54 SDSS J171900.44+264137.5 QSO 17 19 00.4458047832 +26 41 37.544728128   20.44 19.88     ~ 17 0
55 SDSS J203802.06+003648.6 AGN 20 38 02.06944 +00 36 48.6184           ~ 1 0
56 MCG-01-54-008 AGN 21 17 06.9949645392 -06 43 27.956414496   15   13.83   ~ 29 0
57 SN 2019tri SN* 21 17 07.028 -06 43 27.57           SNIa 2 0
58 SDSS J214046.03+091631.7 AGN 21 40 46.03851 +09 16 31.7229           ~ 2 0
59 SDSS J215055.73-010654.1 AGN 21 50 55.7337468312 -01 06 54.135660456           ~ 11 0
60 SDSS J222322.45+004619.1 AGN 22 23 22.45789 +00 46 19.1456           ~ 2 0
61 LEDA 3096757 Sy2 23 53 27.2256999600 +00 07 24.221000856     18.1     ~ 11 0

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