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DC Field | Value | Language |
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dc.contributor.author | Kanekar, Nissim | - |
dc.contributor.author | Sethi, S.K. | - |
dc.contributor.author | Dwarakanath, K.S. | - |
dc.date.accessioned | 2016-10-08T12:57:11Z | - |
dc.date.available | 2016-10-08T12:57:11Z | - |
dc.date.issued | 2016-02 | - |
dc.identifier.citation | Astrophysical Journal Letters, 2016, Vol. 818, pL28 | en_US |
dc.identifier.issn | 2041-8205 | - |
dc.identifier.issn | 2041-8213 (Online) | - |
dc.identifier.uri | http://hdl.handle.net/2289/6432 | - |
dc.description | Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations) | en_US |
dc.description.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. | en_US |
dc.language.iso | en | en_US |
dc.publisher | IOP Publishing Ltd for the American Astronomical Society | en_US |
dc.relation.uri | http://adsabs.harvard.edu/abs/2016ApJ...818L..28K | en_US |
dc.relation.uri | http://arxiv.org/abs/1601.07909 | en_US |
dc.relation.uri | http://dx.doi.org/10.3847/2041-8205/818/2/L28 | en_US |
dc.rights | 2016 American Astronomical Society | en_US |
dc.title | The gas mass of star-forming galaxies at z≈1.3 | en_US |
dc.type | Article | en_US |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2016_apjl_818_L28.pdf Restricted Access | Restricted Access | 1.06 MB | Adobe PDF | View/Open Request a copy |
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