2004MNRAS.355..273C

Query : 2004MNRAS.355..273C

2004MNRAS.355..273C - Mon. Not. R. Astron. Soc., 355, 273-296 (2004/November-3)

The star formation history of Seyfert 2 nuclei.

CID FERNANDES R., GU Q., MELNICK J., TERLEVICH E., TERLEVICH R., KUNTH D., LACERDA R.R. and JOGUET B.

Abstract (from CDS):

We present a study of the stellar populations in the central ∼200 pc of a large and homogeneous sample comprising 79 nearby galaxies, most of which are Seyfert 2s. The star formation history of these nuclei is reconstructed by means of state-of-the-art population synthesis modelling of their spectra in the 3500-5200 Åinterval. A quasar-like featureless continuum (FC) is added to the models to account for possible scattered light from a hidden active galactic nucleus (AGN).

We find the following. (1) The star formation history of Seyfert 2 nuclei is remarkably heterogeneous: young starbursts, intermediate-age and old stellar populations all appear in significant and widely varying proportions. (2) A significant fraction of the nuclei show a strong FC component, but this FC is not always an indication of a hidden AGN: it can also betray the presence of a young, dusty starburst. (3) We detect weak broad Hβ emission in several Seyfert 2s after cleaning the observed spectrum by subtracting the synthesis model. These are most likely the weak scattered lines from the hidden broad-line region envisaged in the unified model, given that in most of these cases independent spectropolarimetry data find a hidden Seyfert 1. (4) The FC strengths obtained by the spectral decomposition are substantially larger for the Seyfert 2s which present evidence of broad lines, implying that the scattered non-stellar continuum is also detected. (5) There is no correlation between the star formation in the nucleus and either the central or overall morphology of the parent galaxies.


Abstract Copyright: 2004 RAS

Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: statistics - galaxies: stellar content

Simbad objects: 83

goto Full paper

goto View the references in ADS

Number of rows : 83
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 NGC 424 Sy1 01 11 27.6385025496 -38 05 00.421096524   13.76 14.12 12.38 12.8 ~ 346 1
2 IC 1657 Sy2 01 14 07.018 -32 39 03.23   13.16   12.02 13.0 ~ 133 1
3 NGC 788 Sy2 02 01 06.4628889816 -06 48 57.149808084   13.71 12.76 11.79   ~ 291 0
4 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
5 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1448 3
6 NGC 1125 Sy2 02 51 40.44 -16 39 02.4   13.98 13.13 12.48   ~ 158 1
7 NGC 1487 GiP 03 55 46.5 -42 22 01   12.28 11.68 11.74 11.02 ~ 124 0
8 NGC 1672 SyG 04 45 42.552 -59 14 50.68 10.29 10.53 9.68 9.53 10.2 ~ 461 2
9 NGC 1667 Sy2 04 48 37.1804579280 -06 19 11.824427712   13.66 12.86 11.72   ~ 384 2
10 ESO 362-8 Sy2 05 11 09.098 -34 23 36.74   13.62 12.65 12.46   ~ 81 0
11 NGC 2110 Sy2 05 52 11.3768668776 -07 27 22.507465392   14.77 13.51 11.86   ~ 712 1
12 MCG-05-18-002 Sy2 07 16 31.2062162520 -29 19 28.882826364   13.28 13.52 11.61   ~ 288 4
13 Z 31-36 Sy2 08 04 05.8608218112 +05 06 49.823376120   14.55 13.7     ~ 340 2
14 NGC 2811 GiG 09 16 11.0885170584 -16 18 45.846758268   12.66       ~ 95 0
15 NGC 2935 Sy2 09 36 44.8527810504 -21 07 41.560449096   11.84 10.04 10.44 11.6 ~ 134 1
16 NGC 2979 GiP 09 43 08.6387939688 -10 22 59.995646472   14       ~ 57 1
17 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 951 3
18 MCG-05-23-016 Sy2 09 47 40.1332188528 -30 56 55.960779696   14.10 13.69 12.44   ~ 611 0
19 IC 2510 Sy2 09 47 43.3494 -32 50 10.975   15.5       ~ 52 0
20 NGC 3035 Sy2 09 51 55.0312678680 -06 49 22.526000580   13.73 13.5 12.55   ~ 83 0
21 NGC 3081 Sy2 09 59 29.5437024336 -22 49 34.747341960   13.06 13.55 11.67 12.1 ~ 509 0
22 IC 2560 Sy2 10 16 18.7073057664 -33 33 49.720274676   12.53 13.31 11.25 12.2 ~ 283 1
23 NGC 3223 Sy2 10 21 35.0831008008 -34 16 00.504571368   11.82 10.82 10.35 11.2 ~ 174 0
24 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 920 2
25 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 392 1
26 Z 37-92 Sy2 10 36 35.7949609728 +05 54 38.079944820   14.7       ~ 46 0
27 NGC 3358 GiG 10 43 33.0219141120 -36 24 38.573516556   12.44 11.53 11.01 11.6 ~ 75 0
28 NGC 3362 Sy2 10 44 51.7308466464 +06 35 48.665072040   17.58 16.96     ~ 162 1
29 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1504 0
30 NGC 3393 Sy2 10 48 23.4653152920 -25 09 43.487648784   13.10 13.95 11.67 12.2 ~ 471 1
31 NGC 3660 Sy2 11 23 32.2781260536 -08 39 30.730097016   15.34 14.45     ~ 185 0
32 IRAS 11215-2806 Sy2 11 24 02.7219289536 -28 23 15.489126168   15.7       ~ 71 0
33 M 61 Sy2 12 21 54.9282582888 +04 28 25.597367184 10.07 10.18 9.65     ~ 1084 1
34 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 871 0
35 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1433 2
36 NGC 4507 Sy2 12 35 36.6338976888 -39 54 33.710416272   12.95 13.54 11.70 12.4 ~ 532 1
37 NGC 4602 Sy2 12 40 36.848 -05 07 58.84   12.34   11.40 11.8 ~ 156 0
38 IC 3639 Sy1 12 40 52.8344884344 -36 45 21.057011172   13.01 13.50 11.87 12.7 ~ 262 1
39 MCG-07-27-013 Sy2 12 53 20.3097014016 -41 38 08.252887200   13.89 13.61 12.29   ~ 95 0
40 ESO 269-12 Sy2 12 56 40.5123469200 -46 55 34.274942184   14.72   13.54 13.9 ~ 65 0
41 NGC 4903 Sy2 13 01 22.7751127320 -30 56 06.083377404   13.74   12.49 13.40 ~ 52 0
42 NGC 4941 Sy2 13 04 13.1036380320 -05 33 05.752803672   13.18 12.23 10.74   ~ 410 0
43 NGC 4939 Sy2 13 04 14.3280524928 -10 20 22.300454724   14.81 13.80 10.92   ~ 332 1
44 NGC 4968 Sy2 13 07 05.976 -23 40 37.34   13.78 14.79 12.46 12.78 ~ 198 2
45 MCG-03-34-064 Sy2 13 22 24.4583154360 -16 43 42.481822404   14   13.16   ~ 345 2
46 NGC 5135 Sy2 13 25 44.059 -29 50 01.24   12.58 13.35 11.53 12.2 ~ 500 1
47 ESO 383-18 Sy2 13 33 26.1018852696 -34 00 53.311162860   15.29 15.32 14.30 14.25 ~ 95 0
48 NGC 5252 Sy2 13 38 15.8707724328 +04 32 33.521265600   15.21 14.21     ~ 514 1
49 Mrk 463E Sy1 13 56 02.88573 +18 22 18.8440   15.01 14.22     ~ 158 1
50 APG 271 IG 14 03 25.45 -06 02 59.9           ~ 209 0
51 NGC 5427 Sy1 14 03 26.0408044536 -06 01 50.682790236   14.67 13.96 11.54   ~ 307 0
52 Mrk 1370 Sy2 14 08 04.0024196544 +07 19 39.457831404   16.0       ~ 34 0
53 NGC 5506 Bla 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1173 1
54 NGC 5643 Sy2 14 32 40.778 -44 10 28.60   11.03 13.60 9.92 10.6 ~ 652 1
55 NGC 5674 Sy2 14 33 52.2788150880 +05 27 30.117378924   13.7 13.70     ~ 197 0
56 Z 273-23 Sy2 14 40 38.0960806920 +53 30 15.961505184   16.05 15.03     ~ 341 1
57 NGC 5728 Sy2 14 42 23.8918506576 -17 15 11.240783784   14.34 13.40     ~ 679 1
58 NGC 5953 Sy2 15 34 32.40240 +15 11 37.7990   13.23 12.45     ~ 389 1
59 Z 138-23 Sy2 16 29 52.87032 +24 26 38.0976   15.40 14.43     ~ 130 0
60 ESO 137-34 Sy2 16 35 14.114 -58 04 48.10   12.20   10.84 11.6 ~ 165 0
61 ESO 138-1 Sy2 16 51 20.2789606296 -59 14 04.184655576   14.35 13.63 13.02   ~ 162 0
62 NGC 6221 Sy2 16 52 46.329 -59 13 00.99   10.90 13.45 9.68 10.4 ~ 328 0
63 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 478 1
64 ESO 103-35 Sy2 18 38 20.3204821536 -65 25 39.141804936   14.75 14.53 13.24   ~ 342 0
65 IC 4769 Sy2 18 47 44.0507117496 -63 09 25.055124876   14.09   12.71 13.4 ~ 85 0
66 IC 4777 Sy2 18 48 11.2992178896 -53 08 51.583361064   14.63 14.63 13.45   ~ 41 0
67 NGC 6890 Sy2 20 18 18.1057797216 -44 48 24.750633168   13.06 14.02 11.57   ~ 171 0
68 IC 4995 Sy2 20 19 58.9795544088 -52 37 18.903502956   14.32 14.06 12.84   ~ 71 0
69 IC 5063 Bla 20 52 02.15 -57 04 06.7   12.92 13.60 11.30   ~ 710 1
70 Z 401-1 Sy2 21 07 44.1 +03 52 31           ~ 92 0
71 Mrk 897 Sy2 21 07 45.894 +03 52 39.50   15.39 14.76     ~ 107 1
72 NGC 7130 Sy2 21 48 19.5412287192 -34 57 04.492024884   12.86 13.87 11.57   ~ 483 1
73 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 572 2
74 NGC 7212a Sy1 22 07 01.9870259424 +10 14 00.838175892   15.1       ~ 217 1
75 ESO 108-17 AGN 22 10 47.263 -66 52 09.57   14.02   13.25 14.1 ~ 38 0
76 NGC 7314 Sy2 22 35 46.1985355872 -26 03 01.564993476   11.62 13.11 10.61 11.4 ~ 601 0
77 NGC 7410 Sy2 22 55 00.8670520224 -39 39 40.773846240   11.35 11.80 9.91   ~ 113 0
78 NGC 7496 Sy2 23 09 47.2876854912 -43 25 40.279652796   11.92 13.90 10.95 11.5 ~ 350 1
79 NGC 7582 Sy2 23 18 23.60 -42 22 13.3 11.62 10.92 10.62     ~ 978 3
80 NGC 7590 Sy1 23 18 54.7949760192 -42 14 20.515300476   12.12 13.76 11.06 11.8 ~ 290 1
81 NGC 7679 Sy2 23 28 46.6613717400 +03 30 41.013578196   13.2       ~ 289 1
82 NGC 7682 Sy2 23 29 03.9181335984 +03 31 59.921415444   14.3       ~ 254 1
83 NGC 7743 Sy2 23 44 21.1607807112 +09 56 02.970989664   14.19 13.28     ~ 334 0

To bookmark this query, right click on this link: simbad:objects in 2004MNRAS.355..273C and select 'bookmark this link' or equivalent in the popup menu