2024ApJS..272...13P

Query : 2024ApJS..272...13P

2024ApJS..272...13P - Astrophys. J., Suppl. Ser., 272, 13 (2024/May-0)

Changing-look Active Galactic Nuclei. I. Tracking the Transition on the Main Sequence of Quasars.

PANDA S. and SNIEGOWSKA M.

Abstract (from CDS):

This paper is the first in a series of papers that prepare and analyze spectral and other properties for a database of already-discovered changing-look active galactic nuclei (CL AGNs). Here we focus on the spectral fitting and analysis of broad emission lines in a sample of 93 CL AGNs collected from the literature with existing Sloan Digital Sky Survey (SDSS)/Baryon Oscillation Spectroscopic Survey (BOSS)/extended-BOSS spectroscopy where the Hβ emission-line profile does not completely disappear in any epochs. Additionally, we have gathered older/newer spectral epochs from all the available SDSS data releases to make the database more complete. We use PYQSOFIT and perform a homogeneous spectral decomposition of all of our SDSS spectra and tabulate the AGN continuum and emission-line properties per epoch per source, chronologically. This further allows us to categorize the sources in our sample as Turn-On or Turn-Off and subsequently check for repeated occurrences of such phases. We then estimate the black hole mass (MBH) and the Eddington ratio (λEdd) per epoch per source where the required parameters are available and well estimated. We demonstrate the movement of the source in the MBH-λEdd plane, allowing us to check for systematic changes in the source's fundamental properties. We then track their transition along the optical plane of the Eigenvector 1 schema and categorize sources that either stay within the same population (A or B) or make an interpopulation movement as a function of spectral epoch. We also test the Balmer decrement (Hα/Hβ) of a subset of our sample of CL AGNs as a function of time and AGN luminosity.

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

Journal keyword(s): Quasars - Active galactic nuclei - Spectroscopy - Catalogs - Supermassive black holes

VizieR on-line data: <Available at CDS (J/ApJS/272/13): table2.dat table3.dat table4.dat>

Simbad objects: 117

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Number of rows : 117
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 J000236.25-002724.7 Sy1 00 02 36.2488238640 -00 27 24.672082968   19.99 19.36     ~ 14 0
2 SDSS J002311.05+003517.4 Sy1 00 23 11.0604554688 +00 35 17.528496792   20.14 19.80     ~ 67 0
3 SDSS J002548.50-003351.3 QSO 00 25 48.502 -00 33 51.35   20.28 20.08     ~ 22 0
4 SDSS J003841.53+000226.6 QSO 00 38 41.5350601896 +00 02 26.626248996   19.97 19.82     ~ 22 0
5 SDSS J004646.00+002729.6 QSO 00 46 45.9996720528 +00 27 29.663651592   19.81 19.66     ~ 25 0
6 Mrk 1502 Sy1 00 53 34.9331107632 +12 41 35.929269132   14.41 14.03     ~ 1242 1
7 SDSS J005813.68+001409.0 QSO 00 58 13.68792 +00 14 09.0960   20.56 20.35     ~ 17 0
8 SDSS J010929.23+014917.0 QSO 01 09 29.2288907256 +01 49 17.099150952           ~ 7 0
9 2MASS J01225619-0002526 Sy1 01 22 56.1906468600 -00 02 52.731887640   20.51 19.80     ~ 23 0
10 [VV2003c] J012648.1-083948 Sy1 01 26 48.0892245120 -08 39 48.056230224   19.27 18.81     ~ 25 0
11 2MASS J01301511+0025579 Sy1 01 30 15.1025789808 +00 25 57.223790220   19.79 19.34     ~ 27 0
12 1RXS J013437.0+022900 QSO 01 34 35.9018574408 +02 28 39.966147984           ~ 10 0
13 SDSS J015653.16-004623.2 QSO 01 56 53.1689588808 -00 46 23.313696528   20.32 20.21     ~ 23 0
14 SDSS J015726.00-000602.0 QSO 01 57 26.004 -00 06 02.07           ~ 9 0
15 2MASS J01595763+0033105 Sy1 01 59 57.6419121888 +00 33 10.497849444   20.31 19.66     ~ 109 0
16 SDSS J020222.00+010557.1 QSO 02 02 22.0054927152 +01 05 57.091971192   19.63 19.34     ~ 28 0
17 SDSS J020514.77-045639.7 QSO 02 05 14.7812776038 -04 56 39.603490004           ~ 18 0
18 Z 387-34 Sy1 02 06 15.9896281128 -00 17 29.221733688   15.90 15.50 10.3   ~ 405 0
19 [VV2006] J021259.6-003029 QSO 02 12 59.5925788680 -00 30 29.470145688   18.13 17.93     ~ 42 0
20 SDSS J021359.08-025352.8 QSO 02 13 59.0754422064 -02 53 52.885656312           ~ 8 0
21 PB 6760 Sy1 02 13 59.7914369184 +00 42 26.743923504   18.12 17.65     ~ 57 0
22 SDSS J022556.07+003026.7 QSO 02 25 56.077 +00 30 26.72   20.08 19.92     ~ 33 0
23 SDSS J022652.23-003916.4 QSO 02 26 52.240 -00 39 16.50   20.74 20.43     ~ 27 0
24 [VV2006] J022930.9-000845 BLL 02 29 30.9178412616 -00 08 45.458008800   19.64 19.45     ~ 31 0
25 SDSS J023030.37-004513.8 Sy1 02 30 30.381 -00 45 13.95   21.05 20.53     ~ 26 0
26 SDSS J023214.86-024845.4 QSO 02 32 14.8523088864 -02 48 45.448136928           ~ 11 0
27 2SLAQ J024508.67+003710.7 Sy1 02 45 08.6786602632 +00 37 10.677824868   20.01 19.44     ~ 26 0
28 SDSS J024535.92+000537.8 QSO 02 45 35.9216936304 +00 05 37.804736976   19.65 19.52     ~ 23 0
29 SDSS J024932.01+002248.4 Sy1 02 49 32.015 +00 22 48.35   19.86 19.52     ~ 10 0
30 US 3215 Sy1 02 50 03.0391773024 +01 09 30.740975424   19.25 18.44     ~ 21 0
31 SDSS J025410.08+034912.0 QSO 02 54 10.0907111640 +03 49 11.979511572           ~ 9 0
32 MCG+00-08-088 Sy2 03 05 10.6067323008 -01 04 31.664956872   18.19 17.40     ~ 35 0
33 IC 450 Sy1 06 52 12.3346265592 +74 25 37.121227716   15.16 14.19     ~ 619 1
34 2MASS J07481903+3353109 QSO 07 48 19.0400131752 +33 53 11.018706972   18.95 18.71     ~ 19 0
35 SDSS J080138.67+423354.1 QSO 08 01 38.6753736480 +42 33 54.138555180           ~ 10 0
36 LEDA 3422317 Sy1 08 13 19.3272031560 +46 08 49.743978000   18.20 17.54     ~ 46 0
37 [VV2006] J081425.9+294115 QSO 08 14 25.8938456256 +29 41 15.653134608   18.69 18.56     ~ 36 0
38 [VV2006] J081632.1+404804 QSO 08 16 32.1195092520 +40 48 04.834325844   19.19 18.97     ~ 27 0
39 SDSS J082323.89+422048.2 SyG 08 23 23.8964598456 +42 20 48.209247384   19.05 18.47     ~ 12 0
40 LEDA 2188986 Sy1 08 29 42.6782568912 +41 54 36.832341204   19.07 18.45     ~ 46 0
41 2MASS J08471602+3732182 Sy1 08 47 16.0432340520 +37 32 18.032278992   18.62 18.51     ~ 74 0
42 SDSS J085704.02+261818.1 QSO 08 57 04.0179035472 +26 18 18.077302296   19.16 18.99     ~ 23 0
43 2MASS J09025839+2529149 Sy1 09 02 58.3878326832 +25 29 15.257127084   19.68 19.19     ~ 19 0
44 SDSS J090339.98+241257.6 QSO 09 03 39.9868011168 +24 12 57.616885224   19.86 19.68     ~ 21 0
45 SDSS J091234.01+262828.3 QSO 09 12 34.0034563968 +26 28 28.327658592   19.32 19.25     ~ 24 0
46 SDSS J091407.16+243633.0 QSO 09 14 07.162 +24 36 33.09           ~ 11 0
47 7C 091344.4+201243 QSO 09 16 34.6739736912 +19 59 52.672656264           ~ 11 1
48 [VV2006] J092836.8+474245 QSO 09 28 36.7859337720 +47 42 45.864405252   19.33 19.13     ~ 26 0
49 US 656 Sy1 09 30 17.7168241704 +47 07 21.021783960   17.82 17.52     ~ 41 0
50 SDSS J093148.13+234837.0 QSO 09 31 48.1442301168 +23 48 37.068510096   19.2   19.0   ~ 9 0
51 Z 35-17 Sy1 09 38 12.2649651984 +07 43 39.952926048   17.16 16.49     ~ 39 0
52 7C 093941.5+235007 QSO 09 42 31.6850212680 +23 36 13.431022740   19.17 18.96     ~ 23 1
53 [VV98] J094443.1+580953 QSO 09 44 43.0940177520 +58 09 53.238921552   18.16 18.14     ~ 39 0
54 SDSS J095750.02+530104.8 QSO 09 57 50.0272090920 +53 01 04.721015640   20.25 20.16     ~ 23 0
55 2MASS J10022021+4509276 QSO 10 02 20.1869093184 +45 09 27.291239676   19.58 19.26     ~ 34 0
56 [MWB97] 569 Sy2 10 02 56.2255838448 +47 50 27.758954148   19.66 19.44     ~ 29 0
57 SDSS J100302.62+193251.2 Sy1 10 03 02.6233758192 +19 32 51.308248308   20.58 20.38     ~ 17 0
58 2MASS J10115298+5442063 Sy1 10 11 52.9792003320 +54 42 06.373633896   18.62 18.31     ~ 53 0
59 SDSS J101322.44+214021.7 QSO 10 13 22.440 +21 40 21.75           ~ 10 0
60 2MASS J10215235+4645158 Sy1 10 21 52.3536589752 +46 45 15.701576328   18.35 18.03     ~ 36 0
61 2MASS J10284438+2304196 Sy1 10 28 44.3585788968 +23 04 19.921853712   19.87 19.30     ~ 11 0
62 SDSS J102913.80+271853.6 Sy1 10 29 13.80199 +27 18 53.6689   20.45 20.32     ~ 13 0
63 SDSS J103624.70+302411.9 QSO 10 36 24.701 +30 24 11.97           ~ 10 0
64 SDSS J104254.79+253713.6 QSO 10 42 54.7978981992 +25 37 13.640412144   19.55 19.44     ~ 20 0
65 RX J1047.0+5444 Sy1 10 47 05.1641436600 +54 44 05.878471272   17.84 17.68     ~ 37 0
66 2MASS J10505840+2413510 Sy1 10 50 58.4246357880 +24 13 51.142349532   19.36 18.97     ~ 15 0
67 LAMOST J105325.40+302419.3 Sy1 10 53 25.4035476744 +30 24 19.313775324   19.37 18.99     ~ 22 0
68 SDSS J105513.89+242553.7 Sy1 10 55 13.889 +24 25 53.69   19.96 19.97     ~ 14 0
69 SDSS J110349.22+312415.6 Sy1 11 03 49.2251447208 +31 24 15.602812416   20.45 20.33     ~ 14 0
70 1WGA J1104.3+6343 AGN 11 04 23.2246753152 +63 43 05.288020644   19.66 19.27     ~ 15 0
71 2MASS J11050126+5627245 Sy1 11 05 01.2612190056 +56 27 24.599780244   19.12 18.82     ~ 23 1
72 2MASS J11132967+5313393 QSO 11 13 29.6898484968 +53 13 38.783590572   19.17 18.76     ~ 26 0
73 SDSS J111829.64+320400.0 QSO 11 18 29.6473927584 +32 03 59.992883640           ~ 12 0
74 2MASS J11194758+2335395 Sy1 11 19 47.6069818968 +23 35 39.539897520   18.56 18.26     ~ 18 0
75 2MASS J11311117+3737087 QSO 11 31 11.1466263120 +37 37 09.155658360   18.45 18.41     ~ 25 0
76 LEDA 3582384 Sy2 11 36 51.6670731744 +44 50 16.390473936   18.11 17.56     ~ 28 0
77 2MASS J11370692+4819436 Sy1 11 37 06.9334325328 +48 19 43.652502012   19.67 19.09     ~ 26 0
78 SDSS J113757.75+365501.4 QSO 11 37 57.7579986552 +36 55 01.471674216           ~ 10 0
79 CSO 1215 Sy1 11 44 08.9074420464 +42 43 57.616105548   18.27 18.10     ~ 31 0
80 SDSS J115039.32+363258.4 QSO 11 50 39.3163568448 +36 32 58.401561012   19.45 19.20     ~ 20 0
81 2MASS J12013061+4940488 QSO 12 01 30.6365277408 +49 40 48.971624268   19.50 19.22     ~ 25 0
82 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2270 1
83 QSO J1204+2754 Bla 12 04 42.1097215992 +27 54 11.869350264   15.64 15.60     ~ 429 0
84 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3938 2
85 SDSS J121831.61+581636.8 QSO 12 18 31.6073014608 +58 16 36.730386696           ~ 13 0
86 2MASS J12343107+5156293 Sy1 12 34 31.0826983560 +51 56 29.209949916   19.52 18.96     ~ 24 0
87 6C 123554+414049 QSO 12 38 19.6160820480 +41 24 20.445955236   18.83 18.79     ~ 38 1
88 SDSS J124523.22+584047.0 QSO 12 45 23.222 +58 40 47.07           ~ 14 0
89 SDSS J124614.86+582624.1 QSO 12 46 14.8518075823 +58 26 24.102642742   20.64 20.47     ~ 21 0
90 SDSS J124946.13+365204.2 QSO 12 49 46.1414622144 +36 52 04.216644840   19.53 19.39     ~ 16 0
91 SDSS J131834.43+531641.0 QSO 13 18 34.4489615304 +53 16 41.077550532           ~ 9 0
92 SDSS J135415.54+515925.8 QSO 13 54 15.5436222816 +51 59 25.723688100   19.18 18.98     ~ 25 0
93 SDSS J135855.82+493414.1 Sy1 13 58 55.8280155192 +49 34 14.060697492           ~ 12 0
94 7C 141138.89+531924.00 Bla 14 13 24.2736244056 +53 05 26.923588440   21.06 20.40 18.4   ~ 73 1
95 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2895 0
96 ICRF J143040.5+364903 BLL 14 30 40.58369349 +36 49 03.8887684   20.13 19.70 19.69   ~ 76 1
97 2MASS J14345529+5723449 Sy1 14 34 55.3112605464 +57 23 45.226811436   17.72 17.45     ~ 35 0
98 SDSS J143919.31+551317.8 QSO 14 39 19.3091509968 +55 13 17.905220544   18.95 18.71     ~ 31 0
99 SDSS J144118.91+485453.8 QSO 14 41 18.9192718344 +48 54 53.744137812   20.10 19.75     ~ 16 0
100 2MASS J15335599+0110296 Sy1 15 33 55.9953969600 +01 10 29.820773100   19.88 19.09     ~ 10 0
101 Z 195-3 Sy1 15 59 09.6231720696 +35 01 47.561352852   15.69 15.06     ~ 346 0
102 2MASS J16362040+4758384 Sy1 16 36 20.3832357600 +47 58 38.390253816   19.30 18.78     ~ 23 0
103 SDSS J163934.03+464314.2 QSO 16 39 34.0382324640 +46 43 14.208511080           ~ 14 0
104 6C 164650+410912 Bla 16 48 29.25803616 +41 04 05.5525848   19.18 18.90 19   ~ 67 1
105 1RXS J172321.6+550417 Sy1 17 23 22.3111874328 +55 04 13.827859680   19.81 19.25     ~ 11 0
106 SDSS J211838.12+005640.6 QSO 21 18 38.1226456608 +00 56 40.737734196   19.83 19.23     ~ 27 0
107 FIRST J214613.3+000930 QSO 21 46 13.3095864888 +00 09 30.768826176   20.84 20.57     ~ 35 0
108 2MASS J21513034+0035215 QSO 21 51 30.3597458328 +00 35 22.191283608   20.77 20.00     ~ 16 0
109 2MASS J22213241-0109285 Sy1 22 21 32.4162470016 -01 09 28.683085752   19.90 19.23     ~ 26 0
110 LEDA 1120758 QSO 22 41 13.5454115184 -01 21 08.887039920           ~ 14 0
111 SDSS J225240.37+010958.7 QSO 22 52 40.374 +01 09 58.71   20.51 20.31     ~ 33 0
112 2SLAQ J230614.18-010024.4 Sy1 23 06 14.1817866048 -01 00 24.470114904   19.52 18.90     ~ 28 0
113 2SLAQ J231625.39-002225.4 Sy1 23 16 25.3959499248 -00 22 25.535514360   19.71 19.13     ~ 30 0
114 SDSS J233317.38-002303.4 QSO 23 33 17.3860168920 -00 23 03.540032124   21.43 20.82     ~ 34 0
115 [VV2003c] J233603.0+001728 Sy1 23 36 02.9868147432 +00 17 28.773473892   20.18 19.66     ~ 26 0
116 SDSS J234623.42+010918.1 QSO 23 46 23.4125882904 +01 09 18.061532568   21.25 20.79     ~ 18 0
117 [VV96] J235438.4+005747 QSO 23 54 39.1481792352 +00 57 51.946595244   19.68 19.47     ~ 36 0

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