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

Evan Scannapieco, Andrea Ferrara, Tom Broadhurst

Research output: Contribution to journalArticle

40 Citations (Scopus)

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)
JournalAstrophysical Journal
Volume536
Issue number1 PART 2
StatePublished - Jun 10 2000
Externally publishedYes

Fingerprint

dwarf galaxies
outflow
perturbation
galaxies
shock
gases
gas
escape velocity
stars
intergalactic media
heat shock
galactic evolution
star formation rate
stripping
supernovae
baryons
near infrared
evaporation
temperature
telescopes

Keywords

  • Cosmology: theory
  • Galaxies: formation
  • Intergalactic medium

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The influence of galactic outflows on the formation of nearby dwarf galaxies. / Scannapieco, Evan; Ferrara, Andrea; Broadhurst, Tom.

In: Astrophysical Journal, Vol. 536, No. 1 PART 2, 10.06.2000.

Research output: Contribution to journalArticle

Scannapieco, Evan ; Ferrara, Andrea ; Broadhurst, Tom. / The influence of galactic outflows on the formation of nearby dwarf galaxies. In: Astrophysical Journal. 2000 ; Vol. 536, No. 1 PART 2.
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