A cosmic relation between extinction and star formation

Oren Zoran, Rennan Barkana, Rodger I Thompson

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We study the relation between the star formation intensity of galaxies and the extinction by dust of their emitted light. We employ a detailed statistical analysis of Hubble Deep Field North data to show a clear positive correlation between the extinction and star formation intensity at all epochs from redshift 0.4 to 6.5. The extinction evidently increases with time for a given star formation intensity, consistent with the expected increase in the metallicity with time. Our observational results are well fitted at all epochs by a double-power-law model with a fixed shape that simply shifts with redshift. The correlation between the extinction and the star formation intensity can be interpreted by combining two other trends: the correlation between the star formation rate and the gas content of galaxies, and the evolution of the dust-to-gas ratio in galaxies. If we assume that Kennicutt's observed relation for the former is valid at each redshift, then our findings imply an interesting variation in the dust-to-gas ratio in galaxies within each epoch and with time, and suggest new ways to investigate the cosmic evolution of this quantity.

Original languageEnglish (US)
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume368
Issue number1
DOIs
StatePublished - 2006

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star formation
extinction
galaxies
dust
time measurement
gases
gas
star formation rate
statistical analysis
metallicity
power law
trends
shift

Keywords

  • Cosmology: observations
  • Dust, extinction
  • Galaxies: evolution
  • ISM: evolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

A cosmic relation between extinction and star formation. / Zoran, Oren; Barkana, Rennan; Thompson, Rodger I.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 368, No. 1, 2006.

Research output: Contribution to journalArticle

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