Galactic outflows in star-forming galaxies at z ∼ 6 studied with deep UV spectra and ALMA emission line

Yuma Sugahara, Masami Ouchi, Yuichi Harikane, Nicolas Bouché, Peter D. Mitchell, Jérémy Blaizot

Research output: Contribution to journalArticlepeer-review

Abstract

We present a velocity of galactic outflows in star-forming galaxies at the highest redshift, z ∼ 6, so far studied with metal absorption lines. Absorption-line studies of galactic outflows need well-determined redshifts, but there are few strong emission lines in the observed-frame optical spectra of galaxies at high redshifts. In this work, we use the systemic redshifts determined by the ALMA [CII]158 μm emission lines. The sample consists of seven Lyman break galaxies at 5.1 < z < 5.7 whose Keck/DEIMOS and ALMA data are available in the archive. The outflow maximum velocity (νmax) is estimated by a fitting of line profiles to metal absorption lines in a composite spectrum. We find that νmax monotonically increases from z ∼ 0 to 6 and that νmax tightly correlates with the halo circular velocity estimated from the stellar mass.

Original languageEnglish
Pages (from-to)307-308
Number of pages2
JournalProceedings of the International Astronomical Union
Volume15
Issue numberS341
DOIs
Publication statusPublished - 2019
Externally publishedYes

Keywords

  • galaxies: evolution
  • galaxies: high-redshift
  • galaxies: kinematics and dynamics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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