Galactic outflows in star-forming galaxies at z ∼ 6 studied with deep UV spectra and ALMA emission line. Issue Volume 15:Issue S341(2019) (November 2019)

• Record Type: Journal Article
• Authors: Sugahara, Yuma; Ouchi, Masami; Harikane, Yuichi; Bouché, Nicolas; Mitchell, Peter D.; Blaizot, Jérémy
• Editors: Boquien, Médéric; Lusso, Elisabeta; Gruppioni, Carlotta; Tissera, Patricia
• Is Part Of: Proceedings of the International Astronomical Union. Volume 15:Issue S341(2019)
• Page Start: 307
• Page End: 308
• Publication Date: 2019-11
• Subjects: galaxies: evolution, -- galaxies: high-redshift, -- galaxies: kinematics and dynamics; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921319002126
• Languages: English
• ISSNs: 1743-9213

Abstract

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 μ m 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.