2011A&A...525A.134M


Query : 2011A&A...525A.134M

2011A&A...525A.134M - Astronomy and Astrophysics, volume 525A, 134-134 (2011/1-1)

Modelling the HI halo of the Milky way.

MARASCO A. and FRATERNALI F.

Abstract (from CDS):

We studied the global distribution and kinematics of the extra-planar neutral gas in the Milky Way. We built 3D models for a series of Galactic HI layers, projected them for an inside view, and compared them with the Leiden-Argentina-Bonn 21-cm observations. We show that the Milky Way disk is surrounded by an extended halo of neutral gas with a vertical scale-height of 1.6+0.6–0.4kpc and an HI mass of 3.2+1.0–0.9x108M, which is ∼5-10% of the total Galactic HI. This HI halo rotates more slowly than the disk with a vertical velocity gradient of -15±4km/s/kpc. We found evidence for a global infall motion in the halo, both vertical (20+5–7km/s) and radial (30+7–5km/s). The Milky Way HI extra-planar layer shows properties similar to the halos of external galaxies, which is compatible with it being predominantly produced by supernova explosions in the disk. It is most likely composed of distinct gas complexes with masses of ∼104–5M, of which the intermediate velocity clouds are the local manifestations. The classical high-velocity clouds appear to be a separate population.

Abstract Copyright:

Journal keyword(s): ISM: kinematics and dynamics - Galaxy: halo - Galaxy: structure - ISM: structure

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 982 1
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12762 1
3 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1676 2
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7179 0
5 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1798 1
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14643 0
7 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2544 2
8 NAME Gal Center Positive HVC 20 51.2 +01 41           ~ 98 1
9 NAME Outer Arm PoG 21 48 +69.4           ~ 321 0
10 NAME Ophiuchus Superbubble HI ~ ~           ~ 12 0

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