2010MNRAS.408L..85J

Query : 2010MNRAS.408L..85J

2010MNRAS.408L..85J - Mon. Not. R. Astron. Soc., 408, L85-L89 (2010/October-2)

GCN: a gaseous galactic halo stream ?

JIN S.

Abstract (from CDS):

We show that a string of HI clouds that form part of the high-velocity cloud complex known as GCN is a probable gaseous stream extending over more than 50° in the Galactic halo. The radial velocity gradient along the stream is used to deduce transverse velocities as a function of distance, enabling a family of orbits to be computed. We find that a direction of motion towards the Galactic disc coupled with a mid-stream distance of ∼20kpc provides a good match to the observed sky positions and radial velocities of the Hi clouds comprising the stream. With an estimated mass of 105M☉, its progenitor is likely to be a dwarf galaxy. However, no stellar counterpart has been found amongst the currently known Galactic dwarf spheroidal galaxies or stellar streams and the exact origin of the stream is therefore currently unknown.

Abstract Copyright: © 2010 The Author. Journal compilation © 2010 RAS

Journal keyword(s): method: numerical - ISM: clouds - ISM: individual objects: GCN - ISM: kinematics and dynamics - Galaxy: halo

Simbad objects: 39

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Number of rows : 39
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 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
4 NAME Cetus-Palca Stream St* 01 31 +01.0           ~ 97 1
5 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
6 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
9 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
10 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
11 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
12 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
13 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
14 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
15 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
16 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
17 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
18 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
19 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
20 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
21 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
22 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
23 NAME Styx Stream St* 13 56 24.0 +26 48 00           ~ 30 0
24 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
25 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
26 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
27 NAME Acheron Stream St* 15 50 24.0 +09 48 39           ~ 14 0
28 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
29 NAME Lethe Stream St* 16 15 45.0 +29 56 45           ~ 16 0
30 NAME Cocytos Stream St* 16 29 21.0 +26 40 08           ~ 19 0
31 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
32 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
33 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
34 NAME GCN Complex HVC 19 32 -14.           ~ 14 0
35 NAME GD-1 Stream St* 22 40 +31.           ~ 319 0
36 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
37 NAME Pisces Overdensity G 23 19.0 +00 00           ~ 65 0
38 NAME Monoceros Stream St* ~ ~           ~ 374 1
39 NAME Local Group GrG ~ ~           ~ 9325 0

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