Where Are the High-Velocity Clouds in Local Group Analogs?
نویسندگان
چکیده
منابع مشابه
Where Are the High-velocity Clouds in Local Group Analogs?
High-velocity clouds (HVCs) are clouds of H i seen around the Milky Way with velocities inconsistent with Galactic rotation; they have unknown distances and masses and controversial origins. One possibility is that HVCs are associated with the small dark matter halos seen in models of galaxy formation and distributed at distances of 150 kpc to 1 Mpc. We report on our attempts to detect the anal...
متن کاملWhere Are the High Velocity Clouds?
Recent observations of high velocity clouds (HVCs) have revealed compression fronts and tail shaped features of HI suggesting that they are interacting with an external medium. We perform 3-D hydrodynamical simulations of HVCs moving through a diffuse hot gaseous component, investigating the behaviour of both extra-galactic dark matter dominated HVCs and nearby pure gas clouds that may be accre...
متن کاملHigh-velocity Clouds and the Local Group
I examine some of the evidence relevant to the idea that high-velocity clouds (HVCs) are gas clouds distributed throughout the Local Group, as proposed by Blitz et al. (1999) and Braun & Burton (1999). This model makes several predictions: a) the clouds have low metallicities; b) there should be no detectable Hα emission; c) analogues near other galaxies should exist; and d) many faint HVCs in ...
متن کاملSurvey of Six Local Group Analogs: I. Survey Description and the Search for High-velocity Clouds
We have conducted an H I 21 cm emission-line survey using the Parkes 20cm multibeam instrument and the Australia Telescope Compact Array (ATCA) of six loose groups of galaxies chosen to be analogs to the Local Group. The goal of this survey is to make a census of the H I-rich galaxies and high-velocity clouds (HVCs) within these groups and compare these populations with those in the Local Group...
متن کاملHigh–Velocity Clouds: Building Blocks of the Local Group
We suggest that the high–velocity clouds (HVCs) are large clouds, with typical diameters of 25 kpc and containing 5×107 solar masses of neutral gas and 3×108 solar masses of dark matter, falling onto the Local Group; altogether the HVCs contain 10 solar masses of neutral gas. Our reexamination of the Local–Group hypothesis for the HVCs connects their properties to the hierarchical structure for...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2004
ISSN: 0004-637X,1538-4357
DOI: 10.1086/423239