Title:	The gas mass of star-forming galaxies at z≈1.3
Authors:	Kanekar, Nissim Sethi, S.K. Dwarakanath, K.S.
Issue Date:	Feb-2016
Publisher:	IOP Publishing Ltd for the American Astronomical Society
Citation:	Astrophysical Journal Letters, 2016, Vol. 818, pL28
Abstract:	We report a Giant Metrewave Radio Telescope search for H i 21 cm emission from a large sample of massive star-forming galaxies at z ≈ 1.18–1.34, lying in sub-fields of the DEEP2 Redshift Survey. The search was carried out by co-adding ("stacking") the H i 21 cm emission spectra of 857 galaxies, after shifting each galaxy's H i 21 cm spectrum to its rest frame. We obtain the 3σ upper limit SH i < 2.5 μJy on the average H i 21 cm flux density of the 857 galaxies, at a velocity resolution of ≈315 km s−1. This yields the 3σ constraint ${M}_{{\rm{H}}{\rm{I}}}\lt 2.1\times {10}^{10}\times {[{\rm{\Delta }}V/315{\text{km s}}^{-1}]}^{1/2}\;{M}_{\odot }$ on the average H i mass of the 857 stacked galaxies, the first direct constraint on the atomic gas mass of galaxies at z > 1. The implied limit on the average atomic gas mass fraction (relative to stars) is MGAS/M* < 0.5, comparable to the cold molecular gas mass fraction in similar star-forming galaxies at these redshifts. We find that the cosmological mass density of neutral atomic gas in massive star-forming galaxies at z ≈ 1.3 is ΩGAS < 3.7 × 10−4, significantly lower than ΩGAS estimates in both galaxies in the local universe and damped Lyα absorbers at z ≥ 2.2. Massive blue star-forming galaxies thus do not appear to dominate the neutral atomic gas content of the universe at z ≈ 1.3.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/6432
ISSN:	2041-8205 2041-8213 (Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2016ApJ...818L..28K http://arxiv.org/abs/1601.07909 http://dx.doi.org/10.3847/2041-8205/818/2/L28
Copyright:	2016 American Astronomical Society
Appears in Collections:	Research Papers (A&A)

Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.