2012ApJ...751...46K

Query : 2012ApJ...751...46K

2012ApJ...751...46K - Astrophys. J., 751, 46 (2012/May-3)

The dynamics and metallicity distribution of the distant dwarf galaxy VV124.

KIRBY E.N., COHEN J.G. and BELLAZZINI M.

Abstract (from CDS):

VV124 (UGC 4879) is an isolated, dwarf irregular/dwarf spheroidal (dIrr/dSph) transition-type galaxy at a distance of 1.36 Mpc. Previous low-resolution spectroscopy yielded inconsistent radial velocities for different components of the galaxy, and photometry hinted at the presence of a stellar disk. In order to quantify the stellar dynamics, we observed individual red giants in VV124 with the Keck/Deep Extragalactic Imaging Multi-Object Spectrograph (DEIMOS). We validated members based on their positions in the color-magnitude diagram, radial velocities, and spectral features. Our sample contains 67 members. The average radial velocity is r> = -29.1±1.3 km/s in agreement with the previous radio measurements of H I gas. The velocity distribution is Gaussian, indicating that VV124 is supported primarily by velocity dispersion inside a radius of 1.5 kpc. Outside that radius, our measurements provide only an upper limit of 8.6 km/s on any rotation in the photometric disk-like feature. The velocity dispersion is σ_ v_= 9.4±1.0 km/s, from which we inferred a mass of M1/2= (2.1 ±0.2)x107 M☉ and a mass-to-light ratio of (M/LV)1/2= 5.2±1.1 M☉/L☉, both measured within the half-light radius. Thus, VV124 contains dark matter. We also measured the metallicity distribution from neutral iron lines. The average metallicity, <[Fe/H]> = -1.14±0.06, is consistent with the mass-metallicity relation defined by dSph galaxies. The dynamics and metallicity distribution of VV124 appear similar to dSphs of similar stellar mass.

Abstract Copyright: ∼

Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: individual: VV124 - galaxies: kinematics and dynamics - Local Group

VizieR on-line data: <Available at CDS (J/ApJ/751/46): table2.dat>

Nomenclature: Table 2: [KCB2012] NNNNN N=131 among (Nos 1167-17428).

Errata: erratum vol. 768, art. 96 (2013)

Simbad objects: 149

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Number of rows : 149
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
3 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
4 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
5 * eta Aur PM* 05 06 30.8941413263 +41 14 04.112669983 2.33 3.00 3.18 3.23 3.40 B3V 391 0
6 [KCB2012] 13585 * 09 15 09.6 +52 49 52           ~ 1 0
7 [KCB2012] 16765 * 09 15 10.8 +52 48 34           ~ 1 0
8 [KCB2012] 16355 * 09 15 11.8 +52 48 50           ~ 1 0
9 [KCB2012] 11688 * 09 15 11.8 +52 50 12           ~ 2 0
10 [KCB2012] 16895 * 09 15 13.4 +52 48 29           ~ 1 0
11 [KCB2012] 3705 * 09 15 15.4 +52 51 59           ~ 2 0
12 [KCB2012] 16598 * 09 15 16.9 +52 48 41           ~ 1 0
13 [KCB2012] 16798 * 09 15 17.5187700744 +52 48 32.643398052           ~ 1 0
14 [KCB2012] 7035 * 09 15 17.9 +52 50 59           ~ 1 0
15 [KCB2012] 7917 RG* 09 15 19.8 +52 50 50           ~ 3 0
16 [KCB2012] 4144 * 09 15 20.7 +52 51 46           ~ 1 0
17 [KCB2012] 14901 * 09 15 21.3 +52 49 32           ~ 1 0
18 [KCB2012] 4415 * 09 15 21.6 +52 51 39           ~ 1 0
19 [KCB2012] 3988 * 09 15 22.8 +52 51 51           ~ 1 0
20 [KCB2012] 12620 * 09 15 23.0 +52 50 03           ~ 2 0
21 [KCB2012] 6707 * 09 15 24.0473368128 +52 51 03.196288224           ~ 1 0
22 [KCB2012] 2109 * 09 15 24.4 +52 53 04           ~ 2 0
23 [KCB2012] 11073 RG* 09 15 24.9 +52 50 19           ~ 3 0
24 [KCB2012] 2411 * 09 15 27.5 +52 52 51           ~ 2 0
25 [KCB2012] 3018 * 09 15 31.3 +52 52 25           ~ 2 0
26 [KCB2012] 4974 * 09 15 32.7 +52 51 28           ~ 2 0
27 [KCB2012] 7245 * 09 15 33.6 +52 50 57           ~ 1 0
28 [KCB2012] 17428 * 09 15 36.7 +52 48 06           ~ 2 0
29 [KCB2012] 12458 * 09 15 37.2820884048 +52 50 05.140635972           ~ 1 0
30 [KCB2012] 16646 * 09 15 37.4 +52 48 39           ~ 1 0
31 [KCB2012] 16000 * 09 15 39.5 +52 49 05           ~ 1 0
32 [KCB2012] 10973 RG* 09 15 41.0 +52 50 21           ~ 3 0
33 [KCB2012] 11786 RG* 09 15 42.0 +52 50 12           ~ 3 0
34 [KCB2012] 9654 RG* 09 15 43.0 +52 50 33           ~ 3 0
35 [KCB2012] 4352 * 09 15 44.2 +52 51 41           ~ 1 0
36 [KCB2012] 15372 * 09 15 44.4 +52 49 22           ~ 1 0
37 [KCB2012] 6832 RG* 09 15 45.5 +52 51 02           ~ 3 0
38 [KCB2012] 11832 RG* 09 15 47.0 +52 50 12           ~ 3 0
39 [KCB2012] 16528 * 09 15 47.2 +52 48 44           ~ 1 0
40 [KCB2012] 14150 RG* 09 15 48.0 +52 49 45           ~ 3 0
41 [KCB2012] 15086 RG* 09 15 48.7 +52 49 29           ~ 3 0
42 [KCB2012] 14111 RG* 09 15 49.2 +52 49 46           ~ 3 0
43 [KCB2012] 13105 RG* 09 15 50.0 +52 49 58           ~ 3 0
44 [KCB2012] 12294 RG* 09 15 50.7 +52 50 07           ~ 3 0
45 [KCB2012] 11104 RG* 09 15 51.2 +52 50 19           ~ 3 0
46 [KCB2012] 9721 RG* 09 15 51.7 +52 50 32           ~ 3 0
47 [KCB2012] 12275 RG* 09 15 52.4 +52 50 07           ~ 3 0
48 [KCB2012] 11247 * 09 15 52.8 +52 50 18           ~ 1 0
49 [KCB2012] 10283 * 09 15 53.2 +52 50 27           ~ 2 0
50 [KCB2012] 7935 RG* 09 15 53.5 +52 50 50           ~ 3 0
51 [KCB2012] 8176 RG* 09 15 54.1 +52 50 48           ~ 3 0
52 [KCB2012] 11089 RG* 09 15 54.8 +52 50 20           ~ 3 0
53 [KCB2012] 8897 RG* 09 15 55.2 +52 50 40           ~ 3 0
54 [KCB2012] 12717 RG* 09 15 56.0 +52 50 03           ~ 3 0
55 [KCB2012] 10534 RG* 09 15 56.3 +52 50 25           ~ 3 0
56 [KCB2012] 4591 RG* 09 15 56.8 +52 51 36           ~ 3 0
57 [KCB2012] 13321 RG* 09 15 57.0 +52 49 56           ~ 3 0
58 [KCB2012] 9265 RG* 09 15 57.8 +52 50 37           ~ 3 0
59 [KCB2012] 7221 RG* 09 15 58.1 +52 50 58           ~ 3 0
60 [KCB2012] 8862 RG* 09 15 58.8 +52 50 41           ~ 3 0
61 [KCB2012] 11997 RG* 09 15 59.5 +52 50 10           ~ 3 0
62 [KCB2012] 11163 RG* 09 16 00.0 +52 50 19           ~ 1 0
63 [KCB2012] 6028 RG* 09 16 00.0 +52 51 12           ~ 3 0
64 [KCB2012] 9378 RG* 09 16 00.8 +52 50 36           ~ 3 0
65 [KCB2012] 12950 RG* 09 16 01.6 +52 50 00           ~ 3 0
66 [KCB2012] 4948 RG* 09 16 01.6 +52 51 29           ~ 3 0
67 SDSS J091601.73+525026.0 * 09 16 01.742 +52 50 26.06     17.81   17.51 F5Ia 3 0
68 Z 264-88 AG? 09 16 02.0195908968 +52 50 42.051257412   14.0 13.2     ~ 141 0
69 SDSS J091602.19+525005.6 HS? 09 16 02.1956930832 +52 50 05.633491812     18.53   18.66 O9.5 4 0
70 [KCB2012] 5337 RG* 09 16 03.0 +52 51 22           ~ 2 0
71 [BBO2011] C1 Cl* 09 16 03.14 +52 50 27.0     18.4   18.1 ~ 3 0
72 [KCB2012] 13043 RG* 09 16 03.2 +52 49 59           ~ 2 0
73 [KCB2012] 7296 RG* 09 16 03.7 +52 50 57           ~ 2 0
74 [KCB2012] 5519 RG* 09 16 04.6 +52 51 19           ~ 3 0
75 [KCB2012] 12844 RG* 09 16 04.7 +52 50 02           ~ 2 0
76 [KCB2012] 11816 RG* 09 16 05.6 +52 50 12           ~ 2 0
77 [KCB2012] 13480 RG* 09 16 06.2 +52 49 54           ~ 2 0
78 [KCB2012] 9565 RG* 09 16 06.5 +52 50 34           ~ 2 0
79 [KCB2012] 14306 RG* 09 16 07.4 +52 49 43           ~ 3 0
80 [KCB2012] 7852 * 09 16 07.4 +52 50 51           ~ 1 0
81 [KCB2012] 5416 RG* 09 16 07.6 +52 51 21           ~ 3 0
82 [KCB2012] 5554 RG* 09 16 08.1 +52 51 18           ~ 3 0
83 [KCB2012] 8116 * 09 16 08.9 +52 50 48           ~ 1 0
84 [KCB2012] 13658 RG* 09 16 09.8 +52 49 52           ~ 3 0
85 [KCB2012] 13756 * 09 16 10.4 +52 49 51           ~ 2 0
86 [KCB2012] 5747 RG* 09 16 10.7 +52 51 16           ~ 3 0
87 [KCB2012] 13493 RG* 09 16 10.9 +52 49 54           ~ 3 0
88 [KCB2012] 5313 RG* 09 16 11.2 +52 51 22           ~ 3 0
89 [KCB2012] 3252 RG* 09 16 11.2 +52 52 18           ~ 3 0
90 [KCB2012] 13961 RG* 09 16 12.9 +52 49 48           ~ 3 0
91 [KCB2012] 12752 RG* 09 16 13.3 +52 50 03           ~ 3 0
92 [KCB2012] 10793 RG* 09 16 13.7 +52 50 23           ~ 3 0
93 [KCB2012] 6192 RG* 09 16 13.8 +52 51 10           ~ 3 0
94 [KCB2012] 8445 RG* 09 16 14.6 +52 50 45           ~ 3 0
95 [KCB2012] 15434 * 09 16 15.9 +52 49 21           ~ 1 0
96 [KCB2012] 6113 RG* 09 16 16.0 +52 51 11           ~ 2 0
97 [KCB2012] 8979 RG* 09 16 17.2 +52 50 40           ~ 3 0
98 [KCB2012] 9994 RG* 09 16 17.8 +52 50 30           ~ 3 0
99 [KCB2012] 13906 * 09 16 18.7 +52 49 49           ~ 1 0
100 [KCB2012] 15285 RG* 09 16 19.4 +52 49 25           ~ 3 0
101 [KCB2012] 10747 * 09 16 19.6 +52 50 23           ~ 1 0
102 [KCB2012] 7392 * 09 16 19.8 +52 50 56           ~ 2 0
103 [KCB2012] 8708 RG* 09 16 20.7 +52 50 42           ~ 3 0
104 [KCB2012] 7689 RG* 09 16 21.2 +52 50 53           ~ 3 0
105 [KCB2012] 8698 RG* 09 16 22.8 +52 50 43           ~ 3 0
106 [KCB2012] 8834 RG* 09 16 23.4 +52 50 41           ~ 3 0
107 [KCB2012] 5875 * 09 16 23.9 +52 51 14           ~ 2 0
108 [KCB2012] 15634 * 09 16 25.3 +52 49 15           ~ 1 0
109 [KCB2012] 7557 * 09 16 26.6 +52 50 54           ~ 1 0
110 [KCB2012] 1499 * 09 16 28.5 +52 53 31           ~ 1 0
111 [KCB2012] 13649 * 09 16 28.8 +52 49 52           ~ 1 0
112 [KCB2012] 15626 * 09 16 29.8 +52 49 15           ~ 2 0
113 [KCB2012] 9911 * 09 16 30.1984093584 +52 50 30.721715304           ~ 1 0
114 [KCB2012] 8079 * 09 16 30.7 +52 50 49           ~ 1 0
115 [KCB2012] 10561 RG* 09 16 32.3 +52 50 25           ~ 2 0
116 [KCB2012] 4422 * 09 16 33.6 +52 51 40           ~ 1 0
117 [KCB2012] 5386 * 09 16 34.3 +52 51 21           ~ 1 0
118 [KCB2012] 4864 * 09 16 34.6779964152 +52 51 30.083861988           ~ 1 0
119 [KCB2012] 2149 * 09 16 34.8 +52 53 03           ~ 2 0
120 [KCB2012] 3631 * 09 16 37.0 +52 52 03           ~ 2 0
121 [KCB2012] 1167 * 09 16 37.5 +52 53 48           ~ 2 0
122 [KCB2012] 8975 * 09 16 38.3 +52 50 40           ~ 2 0
123 [KCB2012] 8693 RG* 09 16 39.2 +52 50 43           ~ 2 0
124 [KCB2012] 2292 * 09 16 39.7 +52 52 58           ~ 1 0
125 [KCB2012] 1704 * 09 16 41.3381612040 +52 53 20.459182128           ~ 1 0
126 [KCB2012] 13380 RG* 09 16 43.6 +52 49 56           ~ 2 0
127 [KCB2012] 6925 * 09 16 43.9 +52 51 01           ~ 1 0
128 [KCB2012] 5090 RG* 09 16 46.3 +52 51 26           ~ 3 0
129 [KCB2012] 1953 * 09 16 46.5141578232 +52 53 09.441780900           ~ 1 0
130 [KCB2012] 2893 * 09 16 49.0 +52 52 31           ~ 2 0
131 [KCB2012] 1861 * 09 16 49.2545529768 +52 53 14.287107264           ~ 1 0
132 [KCB2012] 5221 RG* 09 16 50.8 +52 51 23           ~ 3 0
133 [KCB2012] 13539 * 09 16 52.1 +52 49 54           ~ 2 0
134 [KCB2012] 6304 * 09 16 52.4 +52 51 08           ~ 2 0
135 [KCB2012] 14107 * 09 16 54.4 +52 49 47           ~ 1 0
136 [KCB2012] 9754 * 09 16 54.8130441096 +52 50 32.049890844           ~ 1 0
137 [KCB2012] 3503 RG* 09 16 55.2 +52 52 07           ~ 2 0
138 [KCB2012] 5248 RG* 09 16 56.7 +52 51 23           ~ 2 0
139 [KCB2012] 3751 * 09 16 58.7 +52 51 58           ~ 1 0
140 [KCB2012] 3441 * 09 17 00.0 +52 52 09           ~ 1 0
141 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
142 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
143 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
144 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
145 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
146 LEDA 2801026 LSB 16 13 47.504 +54 22 08.25     15.9     ~ 115 0
147 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
148 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
149 NAME Local Group GrG ~ ~           ~ 9325 0

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