The influence of galactic outflows on the formation of nearby dwarf galaxies

Evan Scannapieco, Andrea Ferrara, Tom Broadhurst

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

We show that the gas in growing density perturbations is vulnerable to the influence of winds outflowing from nearby collapsed galaxies that have already formed stars. This suggests that the formation of nearby galaxies with masses ≲109 M is likely to be suppressed, irrespective of the details of galaxy formation. An impinging wind may shock-heat the gas of a nearby perturbation to above the virial temperature, thereby mechanically evaporating the gas, or the baryons may be stripped from the perturbation entirely if they are accelerated to above the escape velocity. We show that baryonic stripping is the most effective of these two processes, because shock-heated clouds that are too large to be stripped are able to radiatively cool within a sound crossing time, limiting evaporation. The intergalactic medium temperatures and star formation rates required for outflows to have a significant influence on the formation of low-mass galaxies are consistent with current observations, but may soon be examined directly via associated distortions in the cosmic microwave background and with near-infrared observations from the Next Generation Space Telescope, which may detect the supernovae from early-forming stars.

Original languageEnglish (US)
Pages (from-to)L11-L14
JournalAstrophysical Journal
Volume536
Issue number1 PART 2
DOIs
StatePublished - Jun 10 2000
Externally publishedYes

Keywords

  • Cosmology: theory
  • Galaxies: formation
  • Intergalactic medium

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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