2008A&A...485..695C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST15:52:10

2008A&A...485..695C - Astronomy and Astrophysics, volume 485, 695-705 (2008/7-3)

On the morphology of sigma-drop galaxies.

COMERON S., KNAPEN J.H. and BECKMAN J.E.

Abstract (from CDS):

Local reductions of the stellar velocity dispersion in the central regions of galaxies are known as sigma-drops (σ-drops). Knowing the origin of these features can lead to better understanding of inner galactic dynamics. We present a sample of 20σ-drop galaxies matched with a control sample of galaxies without σ-drop in order to search for correlations between σ-drops and the properties, primarily morphological, of the nuclear zones and discs of their host galaxies. We study the dust and Hα distribution at 0.1arcsec scale, using Hubble Space Telescope imaging, in the circumnuclear zones of the two samples of galaxies, searching for differences and trying to establish a link between the nuclear kinematics and the host morphology. We have also considered the CO and Hi emission of the galaxies and their luminosity profiles. We classify the two samples following both morphological parameters and the luminosity profiles. We find a larger fraction of nuclear dust spirals and Hα rings in the σ-drop sample. We also find that the fraction of Seyfert galaxies in the σ-drop sample is bigger than that of LINERs and that the reverse is true for the control sample. Our findings are evidence that a σ-drop is very probably due to inflow-induced star formation in a dynamically cool disc, or in a gas ring, shock focused by an inner Lindblad resonance above a certain critical density level. The same mechanism that feeds the nuclear ring or the nuclear disc is probably reponsible for the higher rate of Seyfert galaxies among the σ-drop hosts.

Abstract Copyright:

Journal keyword(s): Galaxy: kinematics and dynamics - galaxies: nuclei - galaxies: statistics

Simbad objects: 41

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Number of rows : 41

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 488 GiG 01 21 46.848 +05 15 24.19   15.0       ~ 279 0
2 NGC 864 H2G 02 15 27.641 +06 00 09.43   12.00       ~ 203 1
3 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4094 2
4 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1174 3
5 NGC 1566 Sy1 04 20 00.4020009055 -54 56 16.578104141 10.29 10.19 9.73 9.21 10.1 ~ 718 2
6 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 651 3
7 NGC 2460 AGN 07 56 52.3308295806 +60 20 57.726560389   12.5       ~ 117 0
8 NGC 2639 Sy1 08 43 38.093 +50 12 19.94 12.90 12.56 11.65     ~ 383 2
9 NGC 2775 G 09 10 20.112 +07 02 16.53   11.417 10.481 9.920 8.994 ~ 318 0
10 NGC 2964 GiP 09 42 54.251 +31 50 49.97   12.0       ~ 254 1
11 NGC 2985 Sy1 09 50 22.233 +72 16 43.13   11.37 10.61     ~ 222 1
12 NGC 3021 GiG 09 50 57.1458788689 +33 33 12.942434723   12.6       ~ 162 0
13 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3966 5
14 NGC 3169 GiP 10 14 15.099 +03 27 58.03   13.46 12.41     ~ 332 1
15 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 815 1
16 NGC 3227 GiP 10 23 30.57 +19 51 54.3   12.61 11.79     ~ 1534 2
17 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 742 1
18 NGC 3412 GiG 10 50 53.313 +13 24 43.71 11.84 11.45 10.54     ~ 219 1
19 NGC 3593 GiG 11 14 36.9733686308 +12 49 05.505076217   11.8       ~ 327 2
20 M 65 GiP 11 18 55.957 +13 05 31.96   9.6       ~ 405 1
21 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1159 4
22 NGC 3675 GiG 11 26 08.584 +43 35 09.30   11.04   9.57   ~ 261 1
23 NGC 3718 GiP 11 32 34.8527469396 +53 04 04.494313634   11.35 10.61     ~ 343 1
24 NGC 4030 GiP 12 00 23.6122434029 -01 06 00.223672461   11.42   10.3 10.4 ~ 292 1
25 NGC 4102 LIN 12 06 23.115 +52 42 39.42   11.8       ~ 373 1
26 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3380 2
27 M 61 Sy2 12 21 54.9275149050 +04 28 25.588335799 10.07 10.18 9.65     ~ 871 2
28 NGC 4459 H2G 12 29 00.026 +13 58 42.89   11.6       ~ 493 0
29 NGC 4477 Sy2 12 30 02.172 +13 38 11.19 11.98 11.38 10.42     ~ 363 2
30 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 969 2
31 NGC 4725 Sy2 12 50 26.5692916552 +25 30 02.737610391   13.45 12.44     ~ 621 2
32 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 814 2
33 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1056 2
34 NGC 5806 AGN 15 00 00.432 +01 53 28.56   12.40 11.70 10.94 11.6 ~ 238 1
35 NGC 6340 GiP 17 10 24.961 +72 18 15.69   11.87 11.01     ~ 180 1
36 NGC 6503 LIN 17 49 26.4206717057 +70 08 39.587370580 11.56 10.95 10.28 9.92   ~ 470 1
37 NGC 6501 GiP 17 56 03.7387070789 +18 22 22.933662437   13.4       ~ 66 0
38 NGC 6814 Sy1 19 42 40.5857305428 -10 19 25.102133898   15.33 14.21 11.7 11.3 ~ 721 0
39 NGC 6951 Sy2 20 37 14.1181441937 +66 06 20.078027288   11.64 10.65     ~ 498 2
40 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1110 2
41 NGC 7742 GiP 23 44 15.7546655695 +10 46 01.536389590   12.5       ~ 198 0

    Equat.    Gal    SGal    Ecl

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2020.07.16-15:52:10

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