2011AJ....142...14Y

Query : 2011AJ....142...14Y

2011AJ....142...14Y - Astron. J., 142, 14 (2011/July-0)

Ionization mechanisms of HBLR and Non-HBLR Seyfert 2 galaxies.

YU P.-C. and HWANG C.-Y.

Abstract (from CDS):

We investigate the ionization mechanisms for hidden broad-line region (HBLR) and non-HBLR Seyfert 2 galaxies by comparing some optical emission line ratios. We note that the [N II] λ6583/Hα ratio of the non-HBLR Seyfert 2 galaxies is significantly higher than that of the HBLR Seyfert 2 galaxies while other line ratios, such as [O III]/Hβ and [O I]/Hα, are similar. To probe the origin of this difference, we explore theoretical results of different ionization models, such as photoionization, starburst, and shock models. We find that none of these models can explain the high [N II] λ6583/Hα ratio of the non-HBLR Seyfert 2 galaxies with solar abundance; the high [N II] λ6583/Hα must be reproduced from enhanced nitrogen abundance. Since nitrogen overabundance can be achieved from the dredge-up of red supergiants in the post-main-sequence stage, we suggest that the observed nitrogen overabundance of the non-HBLR Seyfert 2 galaxies might be caused by stellar evolution, and there could be an evolutionary connection between the HBLR and non-HBLR Seyfert 2 galaxies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: Seyfert

Simbad objects: 67

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Number of rows : 67
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 Z 478-15 Sy2 00 03 09.6087980256 +21 57 36.971989884   15.30 14.62     ~ 212 1
2 NGC 17 Sy2 00 11 06.612 -12 06 28.33   14.14 13.52     ~ 369 1
3 2MASX J00215355-7910077 Sy2 00 21 53.5554103848 -79 10 08.025602016   17.33 16.3 15.19   ~ 82 0
4 NGC 262 Bla 00 48 47.14147900 +31 57 25.0845702 14.04 13.90 13.06 8.53   ~ 778 2
5 IRAS 00521-7054 Sy2 00 53 56.2229333640 -70 38 04.243791912 17.83 17.22 16.2 16.14 14.55 ~ 109 0
6 NGC 424 Sy1 01 11 27.6385025496 -38 05 00.421096524   13.76 14.12 12.38 12.8 ~ 346 1
7 NGC 591 Sy1 01 33 31.2305692968 +35 40 05.628351108   14.71 13.90     ~ 205 0
8 Z 386-35 Sy1 01 43 57.7777898304 +02 20 59.531401716   14.90 14.07     ~ 569 1
9 ICRF J015002.6-072548 Sy1 01 50 02.6975795592 -07 25 48.453672360   16.86 15.62 15.62   ~ 162 1
10 NGC 788 Sy2 02 01 06.4628889816 -06 48 57.149808084   13.71 12.76 11.79   ~ 291 0
11 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
12 NGC 1142 Sy2 02 55 12.2311509144 -00 11 00.807149472   15.42 14.41     ~ 350 1
13 Z 524-40 Sy2 02 59 58.5970307633 +36 49 13.808979663   14.89 13.96     ~ 369 1
14 MCG-02-08-039 Sy1 03 00 30.6274872888 -11 24 57.031067052   14 14.3 13.45   ~ 110 0
15 NGC 1241 Sy2 03 11 14.6195456232 -08 55 18.775959888 12.07 12.84 11.99 12.7 12.5 ~ 221 2
16 NGC 1320 Sy2 03 24 48.6886857672 -03 02 32.121533436   14.0 14.00     ~ 317 0
17 NGC 1358 Sy2 03 33 39.6807616872 -05 05 22.213915692   14.10 13.05 11.76   ~ 220 1
18 NGC 1386 Sy1 03 36 46.238 -35 59 57.39 12.42 12.16 11.23 10.76   ~ 553 1
19 LEDA 13422 Sy2 03 38 33.5520704184 -16 32 18.242798532   17.67 16.39 17.04   ~ 59 0
20 2MASX J04250311-2521201 Sy2 04 25 03.1185964632 -25 21 20.383189416   18.5       ~ 33 0
21 IRAS 04259-0440 LIN 04 28 26.0481659328 -04 33 49.330024884   15.84 14.95     ~ 51 0
22 IRAS 04385-0828 Sy1 04 40 54.9608896320 -08 22 22.126721232   15.71 14.5     ~ 128 0
23 NGC 1667 Sy2 04 48 37.1804579280 -06 19 11.824427712   13.66 12.86 11.72   ~ 384 2
24 NGC 1685 Sy2 04 52 34.2987606264 -02 56 57.337701864   16.21 15.18     ~ 72 0
25 IRAS 05189-2524 Sy2 05 21 01.3994605776 -25 21 45.321827832   15.47 14.75     ~ 545 0
26 Z 329-24 Sy2 06 15 36.2812259376 +71 02 14.837219808 14.21 14.03 12.97     ~ 960 2
27 NGC 2273 Sy1 06 50 08.6691789600 +60 50 44.864645136   14.50 13.54     ~ 566 2
28 Z 31-36 Sy2 08 04 05.8608218112 +05 06 49.823376120   14.55 13.7     ~ 340 2
29 Z 4-40 Sy2 08 30 14.4203624400 -02 52 49.847026224   15.5       ~ 40 0
30 MCG+05-23-016 Sy1 09 34 06.3274325304 +27 20 59.506582524   16       ~ 76 0
31 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1476 3
32 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 392 1
33 NGC 3362 Sy2 10 44 51.7308466464 +06 35 48.665072040   17.58 16.96     ~ 162 1
34 IRAS 11058-1131 Sy1 11 08 20.2866383856 -11 48 11.925996012   16.30       ~ 60 0
35 NGC 3982 Sy2 11 56 28.1445516072 +55 07 30.859586652   12.20 11.70 11.18   ~ 588 1
36 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1433 2
37 M 88 Sy2 12 31 59.1525062448 +14 25 13.148971824   14.33 13.18     ~ 843 1
38 NGC 4507 Sy2 12 35 36.6338976888 -39 54 33.710416272   12.95 13.54 11.70 12.4 ~ 532 1
39 IC 3639 Sy1 12 40 52.8344884344 -36 45 21.057011172   13.01 13.50 11.87 12.7 ~ 262 1
40 NGC 5135 Sy2 13 25 44.059 -29 50 01.24   12.58 13.35 11.53 12.2 ~ 500 1
41 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
42 NGC 5252 Sy2 13 38 15.8707724328 +04 32 33.521265600   15.21 14.21     ~ 514 1
43 NGC 5256 PaG 13 38 17.81 +48 16 41.2   14.1 13.42     ~ 449 1
44 NGC 5283 Sy2 13 41 05.7499712616 +67 40 19.967186280   14.97 14.05     ~ 269 0
45 ESO 325-22 Sy2 13 48 15.205 -42 10 19.79   15.36 16.17 14.02   ~ 42 0
46 NGC 5347 Sy2 13 53 17.7984934128 +33 29 27.011618196   13.46 12.70     ~ 373 1
47 NGC 5506 Bla 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1173 1
48 NGC 5643 Sy2 14 32 40.778 -44 10 28.60   11.03 13.60 9.92 10.6 ~ 652 1
49 NGC 5695 Sy2 14 37 22.1349838776 +36 34 04.201272336   14.55 13.60     ~ 215 0
50 NGC 5929 Sy1 15 26 06.1564333536 +41 40 14.384294616   13.0 14.00     ~ 450 0
51 NGC 5930 AGN 15 26 07.9964334517 +41 40 33.691556640   13.0       ~ 441 0
52 NGC 5995 Sy2 15 48 24.9463652328 -13 45 27.241966908   14.66 13.69 13.17   ~ 180 1
53 IRAS 15480-0344 Sy1 15 50 41.4972847704 -03 53 17.990582640   16.20 15.1 14.83   ~ 105 1
54 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 478 1
55 FRL 49 Sy2 18 36 58.2335883144 -59 24 08.282326320   11.1   14.19   ~ 270 1
56 NAME Super Antennae Sy2 19 31 21.4272801984 -72 39 21.442847832   17.39 16.37 14.65   ~ 318 3
57 IRAS 20210+1121 Sy2 20 23 25.35647 +11 31 35.2200   15.83       ~ 56 1
58 IRAS 20460+1925 Sy1 20 48 17.2470227976 +19 36 55.956994560   13.93       ~ 76 0
59 IC 5063 Bla 20 52 02.15 -57 04 06.7   12.92 13.60 11.30   ~ 710 1
60 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 572 2
61 IRAS 22017+0319 Sy2 22 04 19.1643461808 +03 33 51.253679232     15.4     ~ 97 0
62 NGC 7212a Sy1 22 07 01.9870259424 +10 14 00.838175892   15.1       ~ 217 1
63 IRAS 23060+0505 Sy1 23 08 33.9537309816 +05 21 29.751752412           ~ 160 0
64 ESO 148-2 Sy2 23 15 46.76280 -59 03 15.6924   14.94 14.73 13.95   ~ 289 1
65 NGC 7582 Sy2 23 18 23.60 -42 22 13.3 11.62 10.92 10.62     ~ 978 3
66 NGC 7674 Sy1 23 27 56.6973043968 +08 46 44.253707772 13.84 13.92 13.23 12.64   ~ 738 2
67 NGC 7682 Sy2 23 29 03.9181335984 +03 31 59.921415444   14.3       ~ 254 1

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