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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Nearly all Massive Quiescent Disk Galaxies Have a Surprisingly Large Atomic Gas Reservoir
Astrophysical Journal Letters, Volume 884, No. 2, Article L52, Year 2019
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Description
The massive galaxy population above the characteristic Schechter mass M ∗ ≈ 1010.6 contributes to about half of the total stellar mass in the local universe. These massive galaxies usually reside in hot dark matter halos above the critical shock-heating mass ∼1012, where the external cold gas supply to these galaxies is expected to be suppressed. When galaxies run out of their cold gas reservoir, they become dead and quiescent. Therefore, massive quiescent galaxies living in hot halos are commonly believed to be gas-poor. Based on the data from SDSS, ALFALFA, GASS, and COLD GASS surveys, here we show that the vast majority of the massive, quiescent, central disk galaxies in the nearby universe have a remarkably large amount of cold atomic hydrogen gas, surprisingly similar to star-forming galaxies. Both star-forming and quiescent disk galaxies show identical symmetric double-horn H i spectra, indicating similar regularly rotating H i disks. Relative to their star-forming counterparts, massive quiescent central disk galaxies are quenched because of their significantly reduced molecular gas content, lower dust content, and lower star formation efficiency. Our findings reveal a new picture, which clearly demonstrates the detailed star formation quenching process in massive galaxies and provides a stringent constraint on the physical mechanism of quenching. © 2019. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Peng, Yingjie
China, Beijing
Peking University
Ho, Luis C.
China, Beijing
Peking University
Maiolino, Roberto
United Kingdom, Cambridge
University of Cambridge
Dekel, Avishai
Israel, Jerusalem
Hebrew University of Jerusalem
United States, Santa Cruz
University of California, Santa Cruz
Guo, Qi
China, Beijing
Chinese Academy of Sciences
China, Beijing
University of Chinese Academy of Sciences
Mannucci, Filippo
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Li, D. H.
China, Beijing
University of Chinese Academy of Sciences
China, Beijing
Chinese Academy of Sciences
Renzini, Alvio
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Guo, Kexin
China, Beijing
Peking University
Australia, Perth
International Centre for Radio Astronomy Research
Statistics
Citations: 36
Authors: 9
Affiliations: 8
Identifiers
Doi:
10.3847/2041-8213/ab4ae4
ISSN:
20418205
Study Design
Cross Sectional Study