Atomic Gas Scaling Relations of Star-forming Galaxies at z ≈ 1

Author:

Chowdhury AdityaORCID,Kanekar NissimORCID,Chengalur Jayaram N.ORCID

Abstract

Abstract We use the Giant Metrewave Radio Telescope Cold-Hi AT z ≈ 1 (CATz1) survey, a 510 hr Hi 21 cm emission survey of galaxies at z = 0.74–1.45, to report the first measurements of atomic hydrogen (Hi) scaling relations at z ≈ 1. We divide our sample of 11,419 blue star-forming galaxies at z ≈ 1 into three stellar-mass (M *) subsamples and obtain detections (at ≥4σ significance) of the stacked Hi 21 cm emission signal from galaxies in all three subsamples. We fit a power-law relation to the measurements of the average Hi mass (M HI) in the three stellar-mass subsamples to find that the slope of the M HIM * relation at z ≈ 1 is consistent with that at z ≈ 0. However, we find that the M HIM * relation has shifted downwards from z ≈ 1 to z ≈ 0, by a factor of 3.54 ± 0.48. Further, we find that the Hi depletion timescales (t dep,HI) of galaxies in the three stellar-mass subsamples are systematically lower than those at z ≈ 0, by factors of ≈2–4. We divide the sample galaxies into three specific star formation rate (sSFR) subsamples, again obtaining ≥4σ detections of the stacked Hi 21 cm emission signal in all three subsamples. We find that the relation between the ratio of Hi mass to stellar mass and the sSFR evolves between z ≈ 1 and z ≈ 0. Unlike the efficiency of conversion of molecular gas to stars, which does not evolve significantly with redshift, we find that the efficiency with which Hi is converted to stars is much higher for star-forming galaxies at z ≈ 1 than those at z ≈ 0.

Funder

Department of Science and Technology, Ministry of Science and Technology, India

Department of Atomic Energy, Government of India

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 10 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Neutral hydrogen lensing simulations in the hubble frontier fields;Monthly Notices of the Royal Astronomical Society;2024-07-11

2. The Most Distant H i Galaxies Discovered by the 500 m Dish FAST;The Astrophysical Journal Letters;2024-05-01

3. The Hi Mass Function of Star-forming Galaxies at z ≈ 1;The Astrophysical Journal Letters;2024-05-01

4. MIGHTEE-H i: H i galaxy properties in the large-scale structure environment at z ∼ 0.37 from a stacking experiment;Monthly Notices of the Royal Astronomical Society;2024-03-09

5. The Gas Accretion Rate of Galaxies over z ≈ 0–1.3;The Astrophysical Journal Letters;2023-11-27

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