Ultraviolet and infrared radiation from protogalaxies

Hidenobu Yajima, Masayuki Umemura, Masao Mori

Research output: Chapter in Book/Report/Conference proceedingConference contribution


To derive UV escape fractions for primordial galaxies, we perform three-dimensional radiative transfer calculations using high-resolution hydrodynamic simulations that include supernovae feedback. As a result, we find that protogalaxies can be highly ionized by intense UV radiation from young stars, and hence have large escape fractions (> 15%). The escape fraction decreases with the chemical evolution of the protogalaxy because of dust extinction.We also study the infrared properties of protogalaxies resulting from chemical evolution. Interstellar dust effectively absorbs UV radiation from stars and then radiates it as infrared. The infrared radiation of high-z galaxies is shifted to submillimeter wavelengths by cosmological redshifts. Hence, they can be promising targets for ALMA. We show the surface brightness distributions of protogalaxies at submillimeter wavelengths and discuss prospects for their detection.

Original languageEnglish
Title of host publicationFirst Stars and Galaxies
Subtitle of host publicationChallenges for the Next Decade
Number of pages2
Publication statusPublished - 2010
Event1st Stars and Galaxies: Challenges for the Next Decade - Austin, TX, United States
Duration: 2010 Mar 82010 Mar 11

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference1st Stars and Galaxies: Challenges for the Next Decade
Country/TerritoryUnited States
CityAustin, TX


  • Dust
  • Extinction
  • Galaxies: evolution
  • Radiative transfer

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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