2025ApJ...986..160D

Query : 2025ApJ...986..160D

2025ApJ...986..160D - Astrophys. J., 986, 160 (2025/June-3)

Newly Discovered Changing-look Active Galactic Nuclei from SDSS and LAMOST Survey.

DONG Q., ZHANG Z.-X., GU W.-M., SUN M. and ZHENG Y.-G.

Abstract (from CDS):

Changing-look active galactic nuclei (CL AGNs) exhibit drastic variations in broad emission lines (BELs), the mechanism of which remains unclear. Expanding the sample of CL AGNs is helpful to reveal the mechanism. This study aims to identify more CL AGNs by crossmatching spectroscopic data from the Sloan Digital Sky Survey and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope. Our approach to identifying CL AGNs is based on automatic spectral fitting, followed by detailed visual inspections. We identify a sample of 51 CL AGNs through this method, in which 40 CL AGNs are newly discovered. Within this sample, 41 CL AGNs primarily show the variability of the Hβ line, nine exhibit obvious changes in both the Hβ and Hα lines, and one source mainly displays variations in the Hα line. Our findings reveal that the sequence of appearance and disappearance of the BELs aligns with the known CL sequence. In addition, we identify 31 candidates exhibiting drastic variations in BELs without accompanying significant photometric variability. We estimate the black hole mass and Eddington ratio for all sources, which range from 2.5 × 106 to 8.0 × 108M⊙ and from 0.001 to 0.13, respectively. Similar to other studies, we also find that the Eddington ratios of CL AGNs and candidates are lower than those of typical AGNs. Our results support the hypothesis that the CL behavior is driven by the state transitions of the accretion disk.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Accretion - Active galactic nuclei - Supermassive black holes - Light curves - Quasars

Simbad objects: 92

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Number of rows : 92
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 2MASS J00025351+2101101 QSO 00 02 53.5256722896 +21 01 09.938567244           ~ 9 0
2 SDSS J004658.25+092045.6 QSO 00 46 58.256 +09 20 45.66           ~ 4 0
3 1RXS J014417.0+314011 QSO 01 44 17.2541263106 +31 40 03.347156975           ~ 6 0
4 Z 387-34 Sy1 02 06 15.9896281128 -00 17 29.221733688   15.90 15.50 10.3   ~ 405 0
5 PB 6760 Sy1 02 13 59.7914369184 +00 42 26.743923504   18.12 17.65     ~ 57 0
6 NGC 863 Sy2 02 14 33.5604714720 -00 46 00.181845336   14.48 13.81 17.9   ~ 770 0
7 SDSS J083132.25+364617.2 Sy2 08 31 32.25242 +36 46 17.2736   18.86 18.12     ~ 10 0
8 2MASS J08382649+3719067 Sy1 08 38 26.5021114128 +37 19 06.626266140   19.89 19.33     ~ 13 0
9 2MASS J08401643+2206247 Sy1 08 40 16.4223917760 +22 06 24.491341152   19.82 19.32     ~ 5 0
10 LEDA 2288101 Sy1 08 46 35.2213158864 +46 50 39.129222372   18.83 18.44     ~ 11 0
11 2MASX J08492738+3248523 Sy1 08 49 27.3702478776 +32 48 52.793977068   18.51 17.89     ~ 14 0
12 2MASS J08495781+2747288 Sy1 08 49 57.7880810232 +27 47 28.950359640   19.90 19.45     ~ 22 0
13 2MASX J08535900+2128031 Sy1 08 53 59.0514459144 +21 28 03.368822988   17.1       ~ 11 0
14 LEDA 1559532 Sy2 09 02 04.2917444232 +18 26 05.111911968           ~ 10 0
15 SDSS J090455.95+300613.2 Sy1 09 04 55.9528079232 +30 06 13.318590672   17.89 17.59     ~ 10 0
16 SDSS J091730.71+110110.7 Sy1 09 17 30.7145306088 +11 01 10.667686584   19.38 19.08     ~ 17 0
17 2MASS J09300533+1739254 Sy1 09 30 05.3105619384 +17 39 25.595738496   19.57 19.06     ~ 7 0
18 LEDA 3580291 Sy1 09 33 27.8746029936 +09 32 00.020680008   18.51 17.92     ~ 20 0
19 2MASX J09373029+2602317 Sy1 09 37 30.3231863640 +26 02 32.176515372           ~ 10 0
20 LEDA 2571792 Sy2 09 41 44.8344278376 +57 51 23.594292108   18.97 18.32     ~ 23 0
21 1WGA J0948.6+4030 Sy1 09 48 38.4270615816 +40 30 43.868269404   17.55 17.03     ~ 40 0
22 SDSS J095536.69+103752.3 Sy1 09 55 36.6955201272 +10 37 52.354302312   20.49 20.03     ~ 11 0
23 LEDA 1598606 Sy1 10 14 03.4364703672 +19 36 09.003203280   19.26 18.74     ~ 8 0
24 2MASS J10141786+3511065 Sy1 10 14 17.8734233448 +35 11 06.790495884   19.53 19.38     ~ 14 0
25 LEDA 2282507 Sy1 10 16 28.0044768384 +46 30 51.640395048   18.46 18.07     ~ 13 0
26 [VV2006] J102025.8+413342 QSO 10 20 25.8369316344 +41 33 42.371343252   18.48 18.33     ~ 25 0
27 2MASS J10282285+2351260 Sy1 10 28 22.8531290232 +23 51 25.689813084   19.24 18.83     ~ 11 0
28 LEDA 2408656 Sy1 10 33 59.1224459952 +52 10 47.611249896   17.83 17.25     ~ 10 0
29 LEDA 2143986 Sy2 10 38 44.0463395880 +39 08 03.974762148   18.75 18.19     ~ 11 0
30 2MASS J10404340+2735185 Sy1 10 40 43.3789728576 +27 35 18.753823932   19.61 18.94     ~ 9 0
31 SDSS J104111.56+555142.3 QSO 10 41 11.5681898520 +55 51 42.299805816   19.84 19.28     ~ 23 0
32 LEDA 31973 Sy1 10 43 32.8841032272 +01 01 08.781977316   18.65 18.11 15.787   ~ 24 0
33 LEDA 1803847 Sy1 10 44 27.7466859480 +27 18 06.261642756   17.27 16.98     ~ 23 0
34 RX J1047.0+5444 Sy1 10 47 05.1641436600 +54 44 05.878471272   17.84 17.68     ~ 37 0
35 2MASS J10491378+0440398 Sy1 10 49 13.7943495528 +04 40 39.930307356   18.68 18.10 17.72 17.33 ~ 12 0
36 2MASS J10520355+1519294 Sy1 10 52 03.5518103160 +15 19 29.571911148   19.35 19.07     ~ 24 0
37 2MASX J10523383+4549495 Sy1 10 52 33.8386248456 +45 49 49.322864640   19.07 18.55     ~ 10 0
38 2MASS J11041331+2815304 Sy1 11 04 13.3245992424 +28 15 30.196730664   19.84 19.32     ~ 11 0
39 LEDA 1828845 Sy2 11 11 42.9413680512 +28 11 26.653581204           ~ 12 0
40 LEDA 3769882 Sy1 11 22 29.6524939848 +21 48 15.612437664   18.19 17.57     ~ 12 0
41 SDSS J113229.14+035729.0 QSO 11 32 29.1389931576 +03 57 29.132180244           ~ 12 0
42 US 2609 Sy1 11 34 02.7846904224 +29 04 03.908934228   20.11 19.66     ~ 11 0
43 2MASS J11415445+0635096 Sy1 11 41 54.4684385160 +06 35 09.641265756   17.63 17.10     ~ 18 1
44 2MASS J11463491+2826418 Sy1 11 46 34.9096938384 +28 26 41.945299512   19.27 18.81     ~ 15 0
45 US 3095 Bla 11 52 27.4895263416 +32 09 59.399774208   19.51 19.01 17.2   ~ 52 1
46 RX J1203.5+4432 Sy1 12 03 32.9390380584 +02 29 34.595780856   16.92 16.65 16.46   ~ 50 0
47 2MASS J12044791+1702570 Sy1 12 04 47.9146022616 +17 02 56.847639948   17.45 17.34     ~ 25 0
48 2MASS J12051020+3335325 Sy1 12 05 10.2390967104 +33 35 32.249146200   18.84 18.43     ~ 21 0
49 LEDA 1544424 Sy1 12 06 35.2042875624 +17 53 12.238958940   18.75 18.34     ~ 10 0
50 2MASS J12081617+3007387 Sy1 12 08 16.2147242640 +30 07 38.218218708   19.23 18.72     ~ 10 0
51 SDSS J121424.97+252551.5 Sy1 12 14 24.9749000880 +25 25 51.522386124   20.05 19.57     ~ 4 0
52 2MASS J12235523+3438563 Sy1 12 23 55.2342594192 +34 38 56.788874628   19.22 18.48     ~ 11 0
53 LEDA 3788963 Sy1 12 26 23.6865006528 +26 10 49.956776292   18.91 18.35     ~ 12 0
54 SDSS J122945.60+440934.5 Sy2 12 29 45.6121768872 +44 09 34.532744688   19.48 18.90     ~ 8 0
55 2MASS J12302068+4627457 Sy1 12 30 20.6750279856 +46 27 45.716726340   18.89 18.39     ~ 23 0
56 2MASS J12335916+0842112 Sy1 12 33 59.1295650552 +08 42 11.643750684   19.21 18.71     ~ 19 0
57 LEDA 2274873 Sy1 12 45 54.7229737104 +46 04 18.915873384   18.35 17.90     ~ 13 0
58 SDSS J130339.70+190120.8 G 13 03 39.7064551104 +19 01 20.914065264           ~ 4 0
59 SDSS J130501.21+010323.9 Sy1 13 05 01.2208206432 +01 03 23.845813128   19.80 19.29 17.645   ~ 8 0
60 SDSS J131001.31+143705.1 Sy1 13 10 01.3213416576 +14 37 05.233398600   19.96 19.53     ~ 6 0
61 2MASX J13143275+1227184 Sy1 13 14 32.7002955168 +12 27 18.406148364   18.95 18.37     ~ 20 0
62 2MASS J13171508+4846304 Sy1 13 17 15.1186426080 +48 46 30.282463668   19.90 19.29     ~ 11 0
63 2MASS J13242197+2802384 Sy1 13 24 21.9852792072 +28 02 38.342133816   18.46 17.99     ~ 14 0
64 2MASS J13324117+3001066 Sy1 13 32 41.1791089344 +30 01 06.631460688   19.68 19.08     ~ 25 0
65 LEDA 140195 Sy1 13 35 51.9637480992 +54 44 50.157995892   17.82 17.37     ~ 24 0
66 LEDA 3812076 BLL 13 41 33.7250369856 +09 03 56.662838568   17.70 17.31     ~ 16 0
67 2MASS J13424100+3212315 Sy1 13 42 41.0257268352 +32 12 31.523530032   19.79 19.17     ~ 10 0
68 SDSS J134739.64+362240.0 Sy1 13 47 39.6421665744 +36 22 40.036925424   19.58 19.22     ~ 7 0
69 2MASX J13525567+2528596 Sy1 13 52 55.6768479624 +25 28 59.563889760   17.60 17.28     ~ 14 0
70 LEDA 3416165 Sy2 13 59 10.9224413280 +53 19 33.786470640   17.94 17.55     ~ 13 0
71 2MASS J14020754+2848592 Sy1 14 02 07.5908349240 +28 48 59.249743344   20.08 19.43     ~ 5 0
72 2MASS J14233702+1038120 Sy1 14 23 36.9835028496 +10 38 12.381893448   19.93 19.34     ~ 6 0
73 2MASS J14342619+0542011 Sy2 14 34 26.1968613552 +05 42 00.993888180   20.21 19.41     ~ 7 0
74 2MASS J14450503+5243418 QSO 14 45 05.0748825360 +52 43 41.999583288   19.23 18.84     ~ 22 0
75 ICRF J145359.7+091543 BLL 14 53 59.73208771 +09 15 43.3285463   19.44 19.01     ~ 39 1
76 2MASS J15002617+3747325 Sy1 15 00 26.1711478440 +37 47 32.419568148   19.86 19.25     ~ 9 0
77 LEDA 1702389 Sy2 15 02 38.3708590920 +24 13 13.821588768   19.05 18.41     ~ 15 0
78 LEDA 1640967 Sy1 15 11 43.4005057104 +21 01 03.967866444   18.14 17.69     ~ 14 0
79 SDSS J151219.33+293736.9 Sy1 15 12 19.3309546584 +29 37 36.959404872   19.40 18.92     ~ 6 0
80 2MASS J15180431+3647480 Sy1 15 18 04.3278902712 +36 47 47.833351800   19.67 19.09     ~ 9 0
81 2MASX J15213500+3206384 Sy1 15 21 34.9656499248 +32 06 38.648676744   19.33 18.87     ~ 14 0
82 2MASX J15290479+0246406 Sy1 15 29 04.7667665832 +02 46 40.327659300   18.15 17.61     ~ 11 0
83 LEDA 3849422 Sy2 15 35 08.4869487168 +13 17 30.474480804   18.76 18.06     ~ 13 0
84 2MASS J15510531+2618195 Sy1 15 51 05.3102211000 +26 18 19.047131208   19.54 18.99     ~ 19 0
85 2MASX J16015755+4902081 Sy1 16 01 57.5313664272 +49 02 07.827765540   19.30 18.82     ~ 22 0
86 2MASS J16171142+0638333 Sy1 16 17 11.4239524104 +06 38 33.432463716   17.42 17.25     ~ 43 1
87 2MASS J16571839+3416365 Sy1 16 57 18.3996754200 +34 16 36.714132840   19.32 18.75     ~ 12 0
88 2MASS J17161722+2734100 Sy1 17 16 17.2297148088 +27 34 10.065253368   19.85 19.29     ~ 14 0
89 SDSS J172533.07+571645.5 Sy1 17 25 33.0900429432 +57 16 45.562052244   18.33 17.77     ~ 17 0
90 LAMOST J220701.84+041706.3 LIN 22 07 01.846 +04 17 06.30           ~ 2 0
91 2MASS J22371692+1424329 Sy1 22 37 16.9061008968 +14 24 32.811264828   18.01 17.40     ~ 6 0
92 NGC 7603 Sy1 23 18 56.6538277656 +00 14 37.977066096   14.73 14.01     ~ 438 0

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