2024ApJS..270...26G

Query : 2024ApJS..270...26G

2024ApJS..270...26G - Astrophys. J., Suppl. Ser., 270, 26 (2024/February-0)

Changing-look Active Galactic Nuclei from the Dark Energy Spectroscopic Instrument. I. Sample from the Early Data.

GUO W.-J., ZOU H., FAWCETT V.A., CANNING R., JUNEAU S., DAVIS T.M., ALEXANDER D.M., JIANG L., AGUILAR J.N., AHLEN S., BROOKS D., CLAYBAUGH T., DE LA MACORRA A., DOEL P., FANNING K., FORERO-ROMERO J.E., GONTCHO A GONTCHO S., HONSCHEID K., KISNER T., KREMIN A., LANDRIAU M., MEISNER A., MIQUEL R., MOUSTAKAS J., NIE J., PAN Z., POPPETT C., PRADA F., REZAIE M., ROSSI G., SIUDEK M., SANCHEZ E., SCHUBNELL M., SEO H.-J., SUI J., TARLE G. and ZHOU Z.

Abstract (from CDS):

Changing-look active galactic nuclei (CL AGNs) can be generally confirmed by the emergence (turn-on) or disappearance (turn-off) of broad emission lines (BELs), associated with a transient timescale (about 100 ∼ 5000 days) that is much shorter than predicted by traditional accretion disk models. We carry out a systematic CL AGN search by crossmatching the spectra coming from the Dark Energy Spectroscopic Instrument and the Sloan Digital Sky Survey. Following previous studies, we identify CL AGNs based on Hα, Hβ, and Mg II at z ≤ 0.75 and Mg II, C III], and C IV at z > 0.75. We present 56 CL AGNs based on visual inspection and three selection criteria, including 2 Hα, 34 Hβ, 9 Mg II, 18 C III], and 1 C IV CL AGN. Eight cases show simultaneous appearances/disappearances of two BELs. We also present 44 CL AGN candidates with significant flux variation of BELs, but remaining strong broad components. In the confirmed CL AGNs, 10 cases show additional CL candidate features for different lines. In this paper, we find: (1) a 24:32 ratio of turn-on to turn-off CL AGNs; (2) an upper-limit transition timescale ranging from 330 to 5762 days in the rest frame; and (3) the majority of CL AGNs follow the bluer-when-brighter trend. Our results greatly increase the current CL census (∼30%) and would be conducive to exploring the underlying physical mechanism.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Active galaxies - Accretion - Active galactic nuclei - Supermassive black holes - Catalogs

Simbad objects: 101

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Number of rows : 101
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 J01595763+0033105 Sy1 01 59 57.6419121888 +00 33 10.497849444   20.31 19.66     ~ 109 0
2 SDSS J075448.10+345828.5 QSO 07 54 48.103 +34 58 28.54           ~ 7 0
3 [VV2006] J085913.8+323051 QSO 08 59 13.7235171552 +32 30 50.766075648   20.62 20.36     ~ 16 0
4 SDSS J091452.90+323347.1 QSO 09 14 52.9055767104 +32 33 47.225168316           ~ 8 0
5 SDSS J095035.55+321601.0 QSO 09 50 35.5577702280 +32 16 01.064231796           ~ 5 0
6 SDSS J102012.84+324737.2 QSO 10 20 12.8381816928 +32 47 37.194519948   17.9 19.07 18.2   ~ 22 0
7 SDSS J102104.98+440355.5 QSO 10 21 04.982 +44 03 55.50           ~ 7 0
8 SDSS J103818.29+332437.2 QSO 10 38 18.294 +33 24 37.21           ~ 2 0
9 SDSS J111634.91+540138.8 QSO 11 16 34.9100535360 +54 01 38.816457204           ~ 7 0
10 SBSG 1116+518 Sy1 11 19 38.0203533672 +51 33 15.521099472   17.37 17.20     ~ 50 0
11 SDSS J112634.33+511554.5 QSO 11 26 34.3323211368 +51 15 54.575962596           ~ 6 0
12 SDSS J113737.38+511839.9 QSO 11 37 37.3827211536 +51 18 39.941637840           ~ 8 0
13 SDSS J115103.77+530140.6 QSO 11 51 03.7771997448 +53 01 40.693678284           ~ 10 0
14 SDSS J115210.24+520205.1 QSO 11 52 10.2661472034 +52 02 05.118086240           ~ 9 0
15 [VV2003c] J115403.0+003153 Sy1 11 54 03.0023771280 +00 31 53.966960940   20.06 19.60     ~ 21 0
16 SDSS J120332.06+563100.3 QSO 12 03 32.0674462440 +56 31 00.384893220           ~ 6 0
17 [VV2006] J121033.3-011755 QSO 12 10 33.3095601744 -01 17 55.626205524   18.74 18.61     ~ 25 0
18 SDSS J122319.70+312737.0 QSO 12 23 19.704 +31 27 37.04           ~ 2 0
19 2MASX J12355766+5821230 Sy1 12 35 57.8755497432 +58 21 22.933335852   18.67 18.32     ~ 32 0
20 SDSS J124446.47+591510.8 QSO 12 44 46.4721624528 +59 15 10.910236788           ~ 7 0
21 SDSS J124931.53+364816.4 QSO 12 49 31.534 +36 48 16.47           ~ 5 0
22 SDSS J125545.34+232348.0 QSO 12 55 45.3499509624 +23 23 48.000374340   20.79 20.66     ~ 9 0
23 SDSS J125610.42+260103.4 QSO 12 56 10.4264308752 +26 01 03.490966236   21.42 20.88     ~ 19 0
24 SDSS J125646.90+233854.8 QSO 12 56 46.9063646376 +23 38 54.792855852   19.43 19.34     ~ 15 0
25 2MASS J13304441+0726291 QSO 13 30 44.4356665104 +07 26 28.797904248   17.7 19.10 18.4   ~ 15 0
26 SDSS J133344.70+335622.7 QSO 13 33 44.706 +33 56 22.80           ~ 2 0
27 2MASS J13403707+1318196 Sy1 13 40 37.0653072696 +13 18 19.278824688   19.93 19.50     ~ 11 0
28 SDSS J134554.00+084537.3 G 13 45 54.00453 +08 45 37.3052           ~ 1 0
29 SDSS J135613.59+001958.6 QSO 13 56 13.6083860544 +00 19 58.634302008   21.19 21.04     ~ 10 0
30 SDSS J135624.58+350813.1 QSO 13 56 24.588 +35 08 13.13           ~ 7 0
31 2MASS J13580163+1153318 Sy1 13 58 01.6325836536 +11 53 31.866509364   19.16 18.91     ~ 20 0
32 [VV2006] J140337.5+043125 QSO 14 03 37.5551822256 +04 31 26.146085484   19.04 19.00     ~ 26 0
33 SDSS J140659.07+032601.9 QSO 14 06 59.0713689720 +03 26 02.012811864   19.85 19.68     ~ 22 0
34 LEDA 1117662 QSO 14 09 57.7215517656 -01 28 50.567437236           ~ 13 0
35 2MASS J14153546+0223388 Sy1 14 15 35.4591201984 +02 23 38.786024400   19.52 18.95     ~ 18 0
36 SDSS J141735.11+043954.6 G 14 17 35.11102 +04 39 54.6257           ~ 1 0
37 SDSS J141801.50+525200.7 QSO 14 18 01.509 +52 52 00.76   20.45   20.18 20.13 ~ 18 0
38 SDSS J141841.39+333245.8 QSO 14 18 41.394 +33 32 45.83           ~ 10 0
39 SDSS J141923.44-030458.7 QSO 14 19 23.4443198472 -03 04 58.822844988           ~ 7 0
40 SDSS J142118.41+505945.2 QSO 14 21 18.4243069104 +50 59 45.196290168           ~ 6 0
41 SDSS J142641.02+521214.6 QSO 14 26 41.0378102808 +52 12 14.365681632           ~ 9 0
42 SDSS J143421.56+044137.2 QSO 14 34 21.566 +04 41 37.22           ~ 8 0
43 SDSS J143528.95+134705.7 QSO 14 35 28.9501015224 +13 47 05.547332652           ~ 9 0
44 SDSS J144003.98+061936.5 G 14 40 03.98272 +06 19 36.5165           ~ 1 0
45 SDSS J144051.17+024415.8 QSO 14 40 51.1695855096 +02 44 15.757710504           ~ 10 0
46 SDSS J144813.63+080734.2 QSO 14 48 13.6433347872 +08 07 34.307952348   19.34 19.22     ~ 15 0
47 [VV2006] J145913.9+360051 QSO 14 59 13.9076654592 +36 00 51.464524788   20.92 20.79     ~ 17 0
48 SDSS J150232.97+062337.6 QSO 15 02 32.9780520840 +06 23 37.695826716           ~ 11 0
49 SDSS J150754.87+274718.7 QSO 15 07 54.8687113488 +27 47 18.701735316           ~ 8 0
50 SDSS J151859.62+061840.5 QSO 15 18 59.6196077544 +06 18 40.454456508           ~ 12 0
51 SDSS J152425.40+232814.7 QSO 15 24 25.402 +23 28 14.79           ~ 7 0
52 SDSS J152517.57+401357.6 QSO 15 25 17.577 +40 13 57.68           ~ 4 0
53 2MASS J15255138+1845520 QSO 15 25 51.3689275440 +18 45 52.081154640   20.21 19.49     ~ 14 0
54 SDSS J152908.75+083203.5 QSO 15 29 08.7622708248 +08 32 03.507949464           ~ 7 0
55 SDSS J153149.94+372755.4 QSO 15 31 49.942 +37 27 55.45           ~ 3 0
56 [VV2006c] J153644.0+330720 Sy1 15 36 44.0353312776 +33 07 21.145394964   20.66 20.44     ~ 15 0
57 SDSS J153714.41+454347.6 QSO 15 37 14.4178555920 +45 43 47.657010288   18.8 19.47 18.7   ~ 20 0
58 2MASS J15392086+0208575 QSO 15 39 20.8378198632 +02 08 57.348605688   20.08 19.62     ~ 10 0
59 SDSS J153938.92+373853.8 QSO 15 39 38.928 +37 38 53.89           ~ 2 0
60 2MASSI J1539522+334930 Sy1 15 39 52.2149385120 +33 49 30.788481180   19.63 19.17     ~ 34 1
61 SDSS J154025.23+211445.6 QSO 15 40 25.2397145976 +21 14 45.642963408   18.88 18.77     ~ 13 0
62 SDSS J154742.72+012541.0 QSO 15 47 42.7271875824 +01 25 41.033856540           ~ 9 0
63 SDSS J155426.13+200527.7 QSO 15 54 26.136 +20 05 27.72           ~ 8 0
64 SDSS J155732.71+402546.3 QSO 15 57 32.7227591568 +40 25 46.333722612           ~ 4 0
65 2MASS J16004765+3313108 Sy1 16 00 47.6335527984 +33 13 10.725491100   20.07 19.56     ~ 18 0
66 SDSS J160129.75+401959.5 QSO 16 01 29.750 +40 19 59.50           ~ 2 0
67 SDSS J160139.10+412529.4 QSO 16 01 39.1105436448 +41 25 29.352864648   19.61 19.42     ~ 18 0
68 [VV2006] J160311.0+432928 QSO 16 03 11.0015408448 +43 29 29.013020160   19.12 19.09     ~ 27 0
69 SDSS J160337.12+242513.9 QSO 16 03 37.1311416744 +24 25 13.945446120           ~ 9 0
70 SDSS J160451.29+553223.4 QSO 16 04 51.299 +55 32 23.47           ~ 4 0
71 SDSS J160712.23+151432.0 QSO 16 07 12.2410303584 +15 14 32.077994352           ~ 9 0
72 SDSS J160730.20+560305.5 QSO 16 07 30.209 +56 03 05.59   19.75   19.75 19.91 ~ 10 0
73 SDSS J160808.47+093715.5 QSO 16 08 08.4774506424 +09 37 15.571310376   20.74 20.51     ~ 10 0
74 SDSS J161235.23+053606.8 G 16 12 35.23945 +05 36 06.7904           ~ 1 0
75 SDSS J161542.41+233143.9 QSO 16 15 42.4126038576 +23 31 43.917813192           ~ 9 0
76 SDSS J161812.85+294416.6 Sy1 16 18 12.8559645528 +29 44 16.594945476   19.64 19.31     ~ 13 0
77 SDSS J161903.04+540529.0 QSO 16 19 03.046 +54 05 29.08           ~ 4 0
78 SDSS J162106.25+371950.7 QSO 16 21 06.256 +37 19 50.72           ~ 2 0
79 2MASS J16282916+4329483 Sy1 16 28 29.1768995856 +43 29 48.534876600   18.56 18.32     ~ 30 0
80 SDSS J163959.17+511930.9 QSO 16 39 59.1728087880 +51 19 30.892976220           ~ 5 0
81 SDSS J164331.91+304835.5 Sy2 16 43 31.9114685544 +30 48 35.650279620   18.41 17.89     ~ 30 1
82 2MASS J16462196+3936236 Sy1 16 46 21.9503060328 +39 36 23.866635672   18.94 18.75     ~ 24 0
83 SDSS J164709.87+532202.2 QSO 16 47 09.8710024440 +53 22 02.302406328           ~ 5 0
84 SDSS J164725.15+351754.3 QSO 16 47 25.1534707440 +35 17 54.441078828           ~ 8 0
85 SDSS J164900.95+452016.8 QSO 16 49 00.956 +45 20 16.84           ~ 4 0
86 SDSS J165919.33+304347.0 QSO 16 59 19.337 +30 43 47.07           ~ 3 0
87 SDSS J170407.13+404747.1 QSO 17 04 07.138 +40 47 47.10           ~ 2 0
88 SDSS J170624.94+423435.1 QSO 17 06 24.942 +42 34 35.14           ~ 2 0
89 SDSS J172541.38+322937.8 QSO 17 25 41.3850171720 +32 29 37.772992860           ~ 9 0
90 SDSS J205407.92+005400.9 QSO 20 54 07.9276956600 +00 54 00.918861840   20.11 19.94     ~ 18 0
91 SDSS J212216.44-014959.8 QSO 21 22 16.446 -01 49 59.82           ~ 4 0
92 SDSS J212338.71+004107.1 QSO 21 23 38.710 +00 41 07.19           ~ 3 0
93 SDSS J213135.84+001517.0 QSO 21 31 35.8452782184 +00 15 17.087508108           ~ 7 0
94 SDSS J213400.68+013828.4 QSO 21 34 00.686 +01 38 28.43           ~ 4 0
95 SDSS J213430.72-003906.8 QSO 21 34 30.7186638384 -00 39 06.821640936   20.89 20.70     ~ 5 0
96 SDSS J213628.50-003811.8 QSO 21 36 28.505 -00 38 11.85           ~ 7 0
97 SDSS J221044.76+245958.0 G 22 10 44.76563 +24 59 58.0106           ~ 2 0
98 SDSS J221925.57+272806.4 QSO 22 19 25.580 +27 28 06.48           ~ 4 0
99 SDSS J221932.80+251850.4 G 22 19 32.80376 +25 18 50.4915           ~ 1 0
100 SDSS J223440.56+272437.9 QSO 22 34 40.565 +27 24 37.95           ~ 3 0
101 2MASS J22465771-0032427 QSO 22 46 57.7015307208 -00 32 42.539045352   20.02 19.67     ~ 15 0

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