The Space Density of Primordial Gas Clouds near Galaxies and Groups and their Relation to Galactic HVCs

Details The Space Density of Primordial Gas Clouds near Galaxies and Groups and their Relation to Galactic HVCs The Space Density of Primordial Gas Clouds near Galaxies and Groups and their Relation to Galactic HVCs

2000-01-03

arxiv.org/abs/astro-ph/0001016v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJL. 7 pages, 2 figures

Scientific paper

10.1086/312488

The Arecibo HI Strip Survey probed the halos of ~300 cataloged galaxies and the environments of ~14 groups with sensitivity to neutral hydrogen masses > 10^7 M_sun. The survey detected no objects with properties resembling the High Velocity Clouds (HVCs) associated with the Milky Way or Local Group. If the HVCs were typically M_HI=10^{7.5} M_sun objects distributed throughout groups and galaxy halos at distances of 1 Mpc, the survey should have made ~70 HVC detections in groups and ~250 detections around galaxies. The null detection implies that HVCs are deployed at typical distances of <200 kpc from the galaxies or group barycenters. If the clouds are in virial equilibrium, their average dark matter fraction must be 98% or higher.

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