2000AJ....120.3027C


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST03:54:10

2000AJ....120.3027C - Astron. J., 120, 3027-3059 (2000/December-0)

The various kinematics of dwarf irregular galaxies in nearby groups and their dark matter distributions.

COTE S., CARIGNAN C. and FREEMAN K.C.

Abstract (from CDS):

Eight dwarf irregular galaxies, in the two nearby groups of galaxies Sculptor and Centaurus A (at 2.5 Mpc and 3.5 Mpc), have been imaged in neutral hydrogen (H I) with the Australia Telescope and the Very Large Array. These galaxies have absolute magnitudes ranging from MB=-15.7 to -11.3. Yet they are mostly rotationally supported, with maximum velocities going from 19 to 67 km.s–1. Multicomponent mass models have been fitted to the rotation curves to investigate the properties of their dark matter halos and the scaling laws of dark matter halo parameters. Dwarf galaxies have, on average, a higher dark to luminous mass ratio, as well as higher dark halo central densities than spiral galaxies. They have a larger dispersion of their dark matter properties both in terms of their total dark matter amount and of their dark halo parameters, compared to spiral galaxies. It is therefore very difficult to predict a dwarf galaxy rotation curve shape based only on its optical properties. Dwarfs are not well fitted by cold dark matter (CDM) halos of the type proposed by Navarro, Frenk, & White, even for ΛCDM models with Ω0 as low as 0.3. For two of our dwarfs we also have Hα rotation curves confirming the H I velocities, so the discrepancy with the CDM models cannot be attributed to beam-smearing effects.

Abstract Copyright:

Journal keyword(s): Cosmology: Dark Matter - Galaxies: Dwarf - Galaxies: Kinematics and Dynamics

Simbad objects: 48

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Number of rows : 48

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Sculptor dIG G 00 08 13.4 -34 34 41   15.54   14.99   ~ 136 3
2 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 718 2
3 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 384 2
4 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3023 2
5 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1356 2
6 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 470 0
7 NGC 625 AGN 01 35 04.632 -41 26 10.32 12.37 11.78 11.25 11.03 11.5 ~ 255 2
8 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2585 2
9 ESO 245-5 G 01 45 03.7 -43 35 52 13.45 12.92 12.63 12.51 12.8 ~ 122 1
10 UGC 1230 LSB 01 45 32.251 +25 31 17.28   17       ~ 78 0
11 NGC 801 AGN 02 03 44.7940775128 +38 15 31.624590609   14.23 13.47     ~ 166 0
12 NAME PER SUPERCL SCG 02 33.2 +41 37           ~ 370 1
13 NGC 1003 GiG 02 39 16.893 +40 52 20.25   12.1   10.83   ~ 165 0
14 UGC 2259 GiP 02 47 55.4157051190 +37 32 18.543987900   14.3   12.8   ~ 120 0
15 UGC 2885 G 03 53 02.4582817635 +35 35 22.169573263   14.4       ~ 134 0
16 QSO B0407-65 QSO 04 08 20.37884 -65 45 09.0806     18.0     ~ 113 1
17 NGC 1560 GiG 04 32 49.087 +71 52 59.20   12.1       ~ 241 0
18 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1650 1
19 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 1009 1
20 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1019 3
21 NGC 2998 LIN 09 48 43.633 +44 04 53.15   13.3       ~ 194 0
22 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 836 1
23 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 522 1
24 UGC 7599 GiP 12 28 28.084 +37 14 05.36   15.6       ~ 88 0
25 NAME CVn I dwA GiC 12 38 40.1 +32 45 59 16.91 16.66 16.73 16.62   ~ 204 0
26 ESO 381-20 G 12 46 00.4 -33 50 17   14.24   13.50 14.0 ~ 77 0
27 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 550 1
28 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 444 0
29 UGCA 320 GiP 13 03 16.736 -17 25 22.91 13.98 13.42 13.09 12.96 13.3 ~ 103 0
30 NGC 5033 Sy1 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 811 3
31 UGC 8333 GiC 13 15 53.778 +25 26 10.13   17       ~ 105 0
32 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 238 0
33 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4096 3
34 Cul 1328+307 Rad 13 31 08.4 +30 28 37           ~ 7 0
35 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2299 2
36 ESO 444-84 GiC 13 37 20.4 -28 02 39 16.04 15.34 15.05 15.05 14.9 ~ 103 1
37 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1286 4
38 ESO 325-11 G 13 45 00.7 -41 51 37   14.02   13.49 12.9 ~ 93 0
39 UGC 9128 G 14 15 56.70 +23 03 16.2 15.40 14.77 14.41 14.32   ~ 258 0
40 NGC 5533 G 14 16 07.7447534360 +35 20 37.779634124   13.0       ~ 153 1
41 NGC 5585 GiG 14 19 48.204 +56 43 44.58   11.73 11.216 11.12 10.123 ~ 388 0
42 LEDA 86657 LSB 15 57 27.483 +20 39 59.12           ~ 90 0
43 NGC 6503 LIN 17 49 26.4206717056 +70 08 39.587370580 11.56 10.95 10.28 9.92   ~ 480 1
44 NGC 6674 G 18 38 33.889 +25 22 30.39   13.7       ~ 98 0
45 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 1013 1
46 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1135 2
47 ESO 471-6 G 23 43 45.549 -31 57 24.37 14.55 14.03 13.73 13.63   ~ 123 1
48 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 967 2

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2021.05.17-03:54:10

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