2008ApJ...679...86W


Query : 2008ApJ...679...86W

2008ApJ...679...86W - Astrophys. J., 679, 86-100 (2008/May-3)

Understanding the AGN-host connection in partially obscured active galactic nuclei. I. The nature of AGN+H II composites.

WANG J. and WEI J.Y.

Abstract (from CDS):

The goal of our serial papers is to examine the evolutionary connection between an active galactic nucleus (AGN) and star formation in the AGN's host galaxy for partially obscured AGNs (i.e., Seyfert 1.8 and 1.9 galaxies). Taking advantage of these galaxies, the properties of both components can be studied together by direct measurements. In this paper, we focus on broad-line composite galaxies (composite AGNs), which are located between the theoretical and empirical separation lines in the [N II]/Hα versus [O III]/Hβ diagram. These galaxies are selected from the composite galaxies provided by the SDSS DR4 MPA/JHU catalogs. After we reanalyze the spectra, we perform a fine classification for the 85 composite AGNs in terms of Baldwin-Phillips-Terlevich (BPT) diagrams. All objects located below the three theoretical separation lines are associated with a young stellar population (<1 Gyr), while either a young or old stellar population is identified in the individual multiply classified objects. The multiply classified objects with very old stellar populations are located in the LINER region in the [O I]/Hα versus [O III]/Hβ diagram. We then consider the connection between AGNs and star formation to derive the key results. The Eddington ratio inferred from the broad Hα emission, the age of the stellar population of the AGN's host as assessed by Dn(4000), and the line ratio [O I]/Hα are found to be related to each other. These relations strongly support an evolutionary scenario in which AGNs evolve from a high L/LEdd state with a soft spectrum to a low L/LEdd state with a hard spectrum as the young stellar population ages and fades. The significant correlation between the line ratio [O I]/Hα and Dn(4000) leads us to suggest that the line ratio could be used to trace the age of the stellar population in type I AGNs.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Evolution - Galaxies: Nuclei

VizieR on-line data: <Available at CDS (J/ApJ/679/86): table1.dat>

Simbad objects: 85

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Number of rows : 85
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 2MASX J00431162-0938163 Sy1 00 43 11.6044292688 -09 38 16.023985620   15.95 15.37 15.03   ~ 28 0
2 2MASX J00474391-0946410 Sy1 00 47 43.9334806272 -09 46 41.123441820   17.17 16.66 16.47   ~ 8 0
3 SDSS J005200.57+003549.2 Sy1 00 52 00.5672539968 +00 35 49.326322884   19.49 18.91     ~ 8 0
4 LEDA 998983 BiC 00 53 12.6854856288 -08 48 09.804278484           ~ 5 0
5 2MASX J01401907-0921106 Sy1 01 40 19.0588395456 -09 21 10.491637212   16.90 16.40     ~ 14 0
6 SDSS J022119.84+005628.5 Sy2 02 21 19.8449339784 +00 56 28.548589632   19.78 19.26     ~ 16 0
7 2E 568 Sy1 02 26 08.1954511632 -00 53 18.763205748   18.68 18.25 17.87   ~ 13 0
8 2MASX J02314097-0110037 BLL 02 31 40.9772039016 -01 10 03.672237000   18.64 18.00 16.39   ~ 16 0
9 2MASX J03345798-0548536 Sy1 03 34 57.9998695248 -05 48 53.314672176   18.03 17.44     ~ 10 0
10 2MASS J07463060+4404334 Sy1 07 46 30.6087887088 +44 04 33.616303284   17.73 17.34     ~ 15 0
11 2MASS J08075226+3832109 Sy1 08 07 52.2736679448 +38 32 10.934924208   17.63 16.93     ~ 15 0
12 2MASS J08121883+3626205 Sy1 08 12 18.8432730792 +36 26 20.507109072   17.96 17.43     ~ 7 0
13 2MASX J08150982+0327538 Sy1 08 15 09.7985191200 +03 27 53.634938436   18.12 17.29     ~ 18 0
14 2MASS J08471642+3153092 Sy1 08 47 16.4411438256 +31 53 09.162372660   17.95 17.36     ~ 7 0
15 2MASS J08533826+0332463 Sy1 08 53 38.2662800856 +03 32 46.114007064   18.19 17.61     ~ 22 0
16 2MASX J08582423+5205410 AGN 08 58 24.2279280216 +52 05 41.058702492   18.91 17.98     ~ 9 0
17 2MASX J09001200+4505146 EmG 09 00 12.0277481352 +45 05 14.773203456           ~ 8 0
18 ICRF J090615.5+463619 Sy1 09 06 15.53979871 +46 36 19.0241852   16.80 16.08     ~ 51 1
19 2MASX J09083710+3059274 Sy1 09 08 37.0804795728 +30 59 27.249658872   18.25 17.73     ~ 13 0
20 SDSS J093327.87+093200.0 Sy1 09 33 27.8746029936 +09 32 00.020680008   18.51 17.92     ~ 16 0
21 2MASX J09362890+4754511 Sy1 09 36 28.9017947184 +47 54 51.175911960   16.63 16.00     ~ 8 0
22 2MASX J09503055+0113139 Sy1 09 50 30.5379631896 +01 13 13.681643844   18.00 17.43     ~ 7 0
23 2MASX J09522776+0141209 Sy1 09 52 27.7923167880 +01 41 21.400245636   15.87 15.33     ~ 20 0
24 2MASS J09555882+5808371 Sy1 09 55 58.8292975272 +58 08 37.118047596   17.50 16.89     ~ 9 0
25 2MASS J10071036+1131460 Sy1 10 07 10.3561498584 +11 31 46.139021004   18.49 17.86     ~ 9 0
26 2MASX J10072039+5620034 Sy1 10 07 20.420 +56 20 03.60           ~ 5 0
27 2MASS J10162841+3759124 Sy1 10 16 28.4329633608 +37 59 12.619584168   18.18 17.64     ~ 5 0
28 QSO J1025-0040 QSO 10 25 00.8159988000 -00 40 44.072910876   20.10 19.67     ~ 44 0
29 2MASS J10255466+4714246 Sy1 10 25 54.6561373128 +47 14 24.703312092   17.40 16.81     ~ 8 0
30 2MASX J10264994+4021290 G 10 26 49.9567587144 +40 21 28.927060020           ~ 4 0
31 2MASS J10464393+6238160 Sy1 10 46 43.9435226880 +62 38 15.899664048   17.75 17.34     ~ 7 0
32 2MASS J10593892+4553295 Sy1 10 59 38.9267275368 +45 53 29.728760784   16.20 15.74     ~ 9 0
33 2E 2376 Sy1 11 01 26.4613825056 +09 47 20.043443616   17.01 16.29     ~ 27 0
34 2MASX J11065446+0612131 AGN 11 06 54.4556753832 +06 12 13.111915104   18.47 17.86     ~ 9 0
35 2MASS J11072051+5029353 Sy1 11 07 20.5158180912 +50 29 35.239748676   17.31 16.73     ~ 7 0
36 2MASS J11200532+5456022 Sy1 11 20 05.3161368408 +54 56 02.537921508   18.29 17.62     ~ 6 0
37 2MASS J11245587+0806154 Sy1 11 24 55.8694708512 +08 06 15.218063100   16.57 16.05     ~ 9 0
38 2MASS J11285258-0321305 Sy1 11 28 52.5973692504 -03 21 30.575577384   18.50 17.81     ~ 22 0
39 2dFGRS TGN306Z071 Sy1 11 30 42.7585255512 -00 49 03.130230180   17.87 17.23 16.916   ~ 9 0
40 2MASS J11325808+4637551 Sy1 11 32 58.0671714048 +46 37 55.263050652   17.84 17.17     ~ 7 0
41 MCG+02-30-030 AGN 11 45 30.2538950184 +09 43 44.750744184   15.49 14.88     ~ 27 0
42 2MASX J11503816-0053261 Sy1 11 50 38.1852399936 -00 53 26.699043192   16.88 16.32 16.078   ~ 11 0
43 2MASS J11522676+1209515 Sy1 11 52 26.7772106232 +12 09 51.701998104   17.45 16.81     ~ 8 0
44 2MASX J12023442+5445006 AGN 12 02 34.3938168984 +54 45 00.724839588   17.80 17.21     ~ 6 0
45 2MASX J12034921+0205575 Sy1 12 03 49.2034651416 +02 05 57.062127444   16.70 16.14     ~ 13 0
46 2E 2732 Sy1 12 29 26.4234487536 +13 20 20.521525560   17.92 17.19     ~ 26 0
47 2MASS J12350348+0455306 Sy1 12 35 03.4849360584 +04 55 30.525310776   16.68 16.26     ~ 10 0
48 2MASX J12444595+6025485 Sy1 12 44 46.0020419832 +60 25 48.768241620   17.23 16.75     ~ 11 0
49 UGC 8027 Sy1 12 54 00.2100907296 +42 42 20.104688304   16.21 15.70     ~ 13 0
50 2MASS J13062096+5318232 LIN 13 06 20.9687514336 +53 18 23.221485000   17.60 16.91     ~ 15 0
51 2MASS J13321557+5852062 Sy1 13 32 15.5643868992 +58 52 06.140444556   17.96 17.51     ~ 5 0
52 2MASX J13371592+0309369 Sy1 13 37 15.9213655896 +03 09 36.596303712   19.34 18.68     ~ 21 0
53 2MASX J13441724+0326332 Sy1 13 44 17.2366482408 +03 26 33.180962388   18.94 18.28     ~ 7 0
54 2MASS J13524438+5724422 Sy1 13 52 44.4091155960 +57 24 42.295550148   17.37 16.87     ~ 7 0
55 2MASS J13571948+3940454 QSO 13 57 19.4734480608 +39 40 45.307317612   19.10 18.41     ~ 17 0
56 2MASS J13591092+5319338 Sy1 13 59 10.9224413280 +53 19 33.786470640   17.94 17.55     ~ 9 0
57 2MASS J14094169+3729049 AGN 14 09 41.7062878104 +37 29 05.131985568   17.11 16.54     ~ 6 0
58 [VV2003c] J142644.4+640703 Sy1 14 26 44.4286716576 +64 07 03.786865068   18.20 17.75     ~ 7 0
59 2MASX J14505420+3508374 AGN 14 50 54.1660789584 +35 08 37.872832056   17.79 17.21     ~ 17 0
60 2MASX J14531042+5809553 Sy1 14 53 10.4439748488 +58 09 55.614152808   17.11 16.53     ~ 12 0
61 2MASS J15030719+4217440 Sy1 15 03 07.1882371608 +42 17 44.197776528   19.00 18.39     ~ 8 0
62 2MASS J15080316+4857281 Sy1 15 08 03.1705548144 +48 57 28.152517500   16.88 16.29     ~ 10 0
63 2MASX J15082946+3711208 AGN 15 08 29.4323457384 +37 11 20.796788004           ~ 8 0
64 2MASX J15101419-0001344 Sy1 15 10 14.2067320656 -00 01 34.919696316   18.77 18.17     ~ 10 0
65 2MASS J15173281+6028445 Sy1 15 17 32.8158007080 +60 28 44.594820228   19.03 18.40     ~ 11 0
66 2MASS J15202348+5029477 Sy1 15 20 23.4925466304 +50 29 47.820608412   17.34 16.76     ~ 9 0
67 2MASX J15203610+3122258 Sy1 15 20 36.0562056960 +31 22 25.776189588   17.62 16.95     ~ 9 0
68 2MASS J15301555+5310352 Sy1 15 30 15.5445913464 +53 10 35.208065568   18.51 17.78     ~ 10 0
69 2MASS J16333020+2136349 AGN 16 33 30.2163157008 +21 36 34.897926780           ~ 8 0
70 2MASX J16341375+4459483 Sy1 16 34 13.7366169264 +44 59 47.816527488   18.27 17.68     ~ 9 0
71 2MASX J16453146+4032248 Sy1 16 45 31.5089560248 +40 32 24.588053880   17.47 16.97     ~ 5 0
72 2MASX J16455222+4426150 Sy1 16 45 52.2045348888 +44 26 14.903770848   18.48 17.55     ~ 12 0
73 2MASS J16464365+2016544 AGN 16 46 43.6606226712 +20 16 54.521915916   17.10 16.49     ~ 5 0
74 2MASX J16503913+6344292 Sy1 16 50 39.1463931072 +63 44 29.043367368   17.94 17.45     ~ 6 0
75 2MASS J17185544+2759474 Sy1 17 18 55.4411012280 +27 59 47.418996048   17.57 16.97     ~ 7 0
76 2MASX J21064109-0755015 G 21 06 41.1131453040 -07 55 01.187835816           ~ 2 0
77 2MASX J21072190+1103589 Sy1 21 07 21.9073449744 +11 03 58.996213812   18.70 18.07     ~ 12 0
78 2MASS J21374145+0053170 Sy1 21 37 41.4475878936 +00 53 16.997209800   15.93 15.31     ~ 12 0
79 2MASX J22053153-0737344 AGN 22 05 31.5642112584 -07 37 34.883119272   16.02 15.51 15.18   ~ 8 0
80 2MASX J22270569-0904248 Sy1 22 27 05.6905096776 -09 04 24.831962904   19.14 18.46     ~ 11 0
81 2MASS J22505727-0854108 Sy1 22 50 57.2727825888 -08 54 10.910657952           ~ 8 0
82 2MASS J22510266-0938240 Sy1 22 51 02.6643914472 -09 38 24.122837940   17.89 17.38     ~ 8 0
83 2MASX J23264305-0959280 Sy1 23 26 43.0855508736 -09 59 27.998980476   18.82 18.24 16.71   ~ 12 0
84 2MASX J23271453-1023179 Sy1 23 27 14.5241805408 -10 23 17.591237376   15.91 15.45     ~ 13 0
85 SDSS J233942.54+142305.3 Sy1 23 39 42.5547015864 +14 23 05.260024320   17.92 17.44     ~ 12 0

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2022.11.30-11:54:12

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