Gaseous haloes: Linking galaxies to the IGM

Filippo Fraternali*, James Binney, Tom Oosterloo, Renzo Sancisi

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)

Abstract

In recent years, evidence has accumulated that nearby spiral galaxies are surrounded by massive haloes of neutral and ionised gas. These gaseous haloes rotate more slowly than the disks and show inflow motions. They are clearly analogous to the High Velocity Clouds of the Milky Way. We show that these haloes cannot be produced by a galactic fountain process (supernova outflows from the disk) where the fountain gas conserves its angular momentum. Making this gas interact with a pre-existing hot corona does not solve the problem. These results point at the need for a substantial accretion of low angular momentum material from the IGM. (c) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)95-98
Number of pages4
JournalNew Astronomy Reviews
Volume51
Issue number1-2
DOIs
Publication statusPublished - Feb-2007
EventWorkshop on Fate of the Gas in Galaxies - , Netherlands
Duration: 12-Jul-200614-Jul-2006

Keywords

  • spiral galaxies
  • haloes
  • NGC 891
  • gas dynamics
  • HIGH-VELOCITY CLOUDS
  • DIFFUSE IONIZED-GAS
  • ON SPIRAL GALAXIES
  • EXTRA-PLANAR GAS
  • H-ALPHA
  • EXTRAPLANAR
  • COMPONENT
  • NGC-2403
  • EMISSION
  • NGC-891

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