2002A&A...391..713K


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.23CEST22:40:12

2002A&A...391..713K - Astronomy and Astrophysics, volume 391, 713-723 (2002/8-4)

Dynamical evolution of high velocity clouds in the intergalactic medium.

KONZ C., BRUENS C. and BIRK G.T.

Abstract (from CDS):

HI observations of high-velocity clouds (HVCs) indicate, that they are interacting with their ambient medium. Even clouds located in the very outer Galactic halo or the intergalactic space seem to interact with their ambient medium. In this paper, we investigate the dynamical evolution of high velocity neutral gas clouds moving through a hot magnetized ambient plasma by means of two-dimensional magnetohydrodynamic plasma-neutral gas simulations. This situation is representative for the fast moving dense neutral gas cloudlets in the Magellanic Stream as well as for high velocity clouds in general. The question on the dynamical and thermal stabilization of a cold dense neutral cloud in a hot thin ambient halo plasma is numerically investigated. The simulations show the formation of a comet-like head-tail structure combined with a magnetic barrier of increased field strength which exerts a stabilizing pressure on the cloud and hinders hot plasma from diffusing into the cloud. The simulations can explain both the survival times in the intergalactic medium and the existence of head-tail high velocity clouds.

Abstract Copyright:

Journal keyword(s): magnetohydrodynamics (MHD) - galaxies: halos - intergalactic medium - Magellanic Clouds - galaxies: magnetic fields

CDS comments: HVC A2 = [H68] A II

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME HVC Complex A HVC 08 36 +64.4           ~ 117 0
2 NAME HVC Complex M HVC 10 48.2 +48 00           ~ 73 0
3 HVC 125+41-208 HVC 12 24.0 +75 36           ~ 33 0
4 NAME HVC Complex C HVC 16 34.8 +63 07           ~ 229 1
5 [H68] A II HVC ~ ~           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.09.23-22:40:12

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