2003AJ....126.1295B

Query : 2003AJ....126.1295B

2003AJ....126.1295B - Astron. J., 126, 1295-1304 (2003/September-0)

The H I environment of the Sculptor dwarf spheroidal galaxy.

BOUCHARD A., CARIGNAN C. and MASHCHENKO S.

Abstract (from CDS):

New observations of the neutral hydrogen (H I) in and around the line of sight of the Sculptor dwarf spheroidal galaxy (dSph) are presented. The data obtained with the single-dish Parkes telescope cover a large area of 7°x7° in the direction of the dwarf and have resolutions of 15'.5x1.12 km.s–1. The Australia Telescope Compact Array was used to map a smaller area of 2°.2x2°.2 centered on the direction of the dwarf with higher resolutions (350"x140"x1.65 km.s–1). Many H I structures having velocities outside the range of the normal Galactic disk velocities were detected, including the two Sculptor clouds (northeast and southwest) of Carignan et al. (C98). The present study shows the total extent of the C98 clouds. We derived heliocentric radial velocities for the northeast and southwest clouds of 100.2±0.9 and 105.1±0.3 km.s–1, respectively. The intensity-weighted mean H I velocity for both clouds is 104.1±0.4 km.s–1. Three different hypotheses concerning the association of the C98 Sculptor clouds were considered. The case for the clouds belonging to the Sculptor group of galaxies is found to be inconsistent with the observational data. The probability of the C98 Sculptor clouds to be Milky Way features at anomalous velocities (HVCs) superposed by chance on the Sculptor dSph is estimated to be less than 2%. The third hypothesis assumes that the clouds are physically associated with the Sculptor dSph and is supported by the following evidence: (1) the radial velocities for both clouds are very close to the optical velocity of the Sculptor dSph (ΔV=4±3 km.s–1), (2) 88% of the total H I flux is contained within the optical radius of the galaxy, and (3) the clouds are located symmetrically relative to the center of the Sculptor dSph. Arguments are presented that the C98 Sculptor clouds are still gravitationally bound to the dwarf galaxy and are part of its interstellar medium. The mass of each cloud is (4.1±0.2)x104 M☉(northeast cloud) and (1.93±0.02)x105 M☉(southwest cloud) at the Sculptor dSph distance (79kpc).

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Dwarf - galaxies: individual (Sculptor) - Local Group - Radio Emission Lines - Techniques: Interferometric

Simbad objects: 79

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Number of rows : 79
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 HVC 350.9-79.4+162 HVC 00 13.6 -33 53           ~ 2 0
2 HVC 341.1-78.2-124 HVC 00 15.6 -36 05           ~ 2 0
3 HVC 353.0-80.2+146 HVC 00 15.7 -33 07           ~ 3 0
4 GHVC G334.0-77.8-133 HVC 00 20.1 -37 38           ~ 4 0
5 HVC 346.8-80.7+198 HVC 00 20.5 -33 37           ~ 3 0
6 HVC 000.4-82.5+109 HVC 00 21.9 -30 58           ~ 3 0
7 HVC 337.5-79.4+171 HVC 00 22.0 -35 40           ~ 2 0
8 HVC 348.5-81.6+129 HVC 00 23.0 -32 49           ~ 3 0
9 GHVC G328.7-78.3-133 HVC 00 25.9 -37 31           ~ 4 0
10 HVC 331.0-79.3+255 HVC 00 26.4 -36 27           ~ 2 0
11 GHVC G335.5-81.7-169 HVC 00 30.0 -33 43           ~ 4 0
12 GHVC G318.3-74.8+168 HVC 00 30.6 -41 38           ~ 4 0
13 HVC 347.1-83.8-192 HVC 00 31.0 -31 31           ~ 4 0
14 HVC 325.8-79.8+202 HVC 00 31.7 -36 29           ~ 3 0
15 HVC 316.7-74.7-94 HVC 00 32.0 -41 56           ~ 3 0
16 HVC 319.1-78.8+215 HVC 00 35.7 -37 52           ~ 4 0
17 HVC 023.1-86.6-168 HVC 00 36.2 -27 40           ~ 2 0
18 GHVC G313.2-74.7+142 HVC 00 36.6 -42 04           ~ 4 0
19 HVC 323.6-81.8-166 HVC 00 37.4 -34 45           ~ 2 0
20 HVC 057.9-86.7-140 HVC 00 38.2 -25 42           ~ 3 0
21 GHVC G313.9-77.2+130 HVC 00 38.6 -39 45           ~ 5 0
22 GHVC G312.8-75.2-107 HVC 00 39.2 -41 37           ~ 4 0
23 HVC 315.0-80.8+160 HVC 00 42.0 -36 04           ~ 3 0
24 GHVC G316.5-82.2+158 HVC 00 42.4 -34 40           ~ 4 0
25 GHVC G326.5-85.0-153 HVC 00 42.4 -31 43           ~ 4 0
26 HVC 309.0-74.4-98 HVC 00 42.6 -42 36           ~ 2 0
27 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
28 HVC 310.0-76.9+186 HVC 00 43.1 -40 08           ~ 2 0
29 HVC 315.0-83.0-199 HVC 00 44.4 -33 56           ~ 3 0
30 HVC 317.0-84.8-137 HVC 00 45.5 -32 08           ~ 2 0
31 HVC 316.1-85.7+138 HVC 00 46.8 -31 20           ~ 3 0
32 GHVC G307.6-79.7+136 HVC 00 47.2 -37 11           ~ 4 0
33 HVC 307.1-78.8+164 HVC 00 47.3 -38 20           ~ 2 0
34 HVC 308.3-84.1+113 HVC 00 48.8 -32 59           ~ 3 0
35 HVC 309.9-86.3-191 HVC 00 49.3 -30 50           ~ 3 0
36 GHVC G311.2-85.1-179 HVC 00 49.8 -31 54           ~ 4 0
37 HVC 304.9-83.1+140 HVC 00 50.3 -34 04           ~ 2 0
38 HVC 306.4-88.4-202 HVC 00 51.0 -28 42           ~ 2 0
39 HVC 303.1-76.6-110 HVC 00 51.2 -40 31           ~ 2 0
40 HVC 301.6-73.8+226 HVC 00 53.6 -43 22           ~ 3 0
41 HVC 299.1-82.6-167 HVC 00 53.8 -34 31           ~ 3 0
42 HVC 150.5-88.7-240 HVC 00 54.1 -25 59           ~ 2 0
43 HVC 256.2-89.1-212 HVC 00 54.2 -27 43           ~ 2 0
44 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
45 HVC 292.7-85.8-191 HVC 00 54.9 -31 15           ~ 3 0
46 HVC 299.1-77.7+144 HVC 00 55.7 -39 22           ~ 3 0
47 GHVC G298.0-81.7+127 HVC 00 56.1 -35 53           ~ 4 0
48 GHVC G283.2-86.8-141 HVC 00 56.8 -30 04           ~ 4 0
49 HVC 295.4-80.1-205 HVC 00 57.9 -36 57           ~ 3 0
50 HVC 293.2-82.0-243 HVC 00 58.0 -35 01           ~ 3 0
51 HVC 221.0-88.2-256 HVC 00 59.6 -27 22           ~ 6 1
52 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
53 HVC 277.1-85.6-182 HVC 01 00.3 -31 02           ~ 3 0
54 HVC 283.9-84.0-180 HVC 01 00.7 -32 47           ~ 2 0
55 HVC 197.5-87.6-268 HVC 01 01.9 -26 28           ~ 2 0
56 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
57 HVC 281.2-82.7-212 HVC 01 04.4 -33 52           ~ 2 0
58 HVC 276.0-83.5-140 HVC 01 05.4 -32 52           ~ 3 0
59 HVC 283.3-73.9+148 HVC 01 20.4 -42 07           ~ 3 0
60 HVC 224.0-83.4-197 HVC 01 20.7 -28 12           ~ 13 0
61 HVC 265.2-79.9-88 HVC 01 21.4 -34 54           ~ 2 0
62 HVC 237.0-82.4-164 HVC 01 23.6 -30 00           ~ 3 0
63 HVC 231.2-81.5-118 HVC 01 28.4 -29 28           ~ 2 0
64 HVC 253.2-79.8-121 HVC 01 28.6 -33 23           ~ 2 0
65 HVC 235.1-81.0-93 HVC 01 30.0 -30 11           ~ 2 0
66 HVC 257.7-78.5+107 HVC 01 31.3 -34 53           ~ 3 0
67 HVC 255.2-78.6-155 HVC 01 32.2 -34 23           ~ 3 0
68 HVC 259.5-77.9-83 HVC 01 32.3 -35 34           ~ 2 0
69 HVC 245.3-79.5-96 HVC 01 33.4 -32 22           ~ 2 0
70 HVC 271.8-73.7+120 HVC 01 35.5 -40 38           ~ 3 0
71 HVC 269.4-74.5-112 HVC 01 35.5 -39 36           ~ 3 0
72 HVC 266.0-74.0+101 HVC 01 41.0 -39 23           ~ 3 0
73 HVC 250.5-76.9-97 HVC 01 41.8 -34 32           ~ 2 0
74 HVC 241.3-77.8+111 HVC 01 42.4 -32 22           ~ 3 0
75 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
76 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
77 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
78 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
79 NAME Local Group GrG ~ ~           ~ 9325 0

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