The fine line between normal and starburst galaxies

被引：0

作者：

Lee N. ^{[1
]}

Sheth K. ^{[2
,3
]}

Scott K.S. ^{[3
,4
]}

Toft S. ^{[1
]}

Magdis G.E. ^{[1
,5
]}

Damjanov I. ^{[6
]}

Zahid H.J. ^{[6
]}

Casey C.M. ^{[7
]}

Cortzen I. ^{[1
]}

Guijarro C.G. ^{[1
]}

Karim A. ^{[8
]}

Leslie S.K. ^{[9
]}

Schinnerer E. ^{[9
]}

机构：

[1] Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen

[2] National Aeronautics and Space Administration Headquarters, 300 E Street SW, Washington, 20024-3210, DC

[3] North American ALMA Science Center, National Radio Astronomy Observatory, Charlottesville, 22903, VA

[4] University of Virginia Health System, 1215 Lee Street, Charlottesville, 22903, VA

[5] Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens

[6] Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, 02138, MA

[7] Department of Astronomy, The University of Texas at Austin, 2515 Speedway Boulevard Stop C1400, Austin, 78712, TX

[8] Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, Bonn

[9] Max-Planck Institute for Astronomy, Koenigstuhl 17, Heidelberg

来源：

| 1600年 / Oxford University Press卷 / 471期

基金：

美国国家科学基金会; 欧盟地平线“2020”; 美国国家航空航天局;

关键词：

Galaxies: evolution; Galaxies: star formation; Infrared: galaxies;

D O I：

10.1093/MNRAS/STX1753

中图分类号：

学科分类号：

摘要：

Recent literature suggests that there are two modes through which galaxies grow their stellar mass - a normal mode characterized by quasi-steady star formation, and a highly efficient starburst mode possibly triggered by stochastic events such as galaxy mergers. While these differences are established for extreme cases, the population of galaxies between these two regimes is poorly studied and it is not clear where the transition between these two modes of star formation occurs.We utilize the Atacama Large Millimeter/submillimeter Array observations of the CO J = 3-2 line luminosity in a sample of 20 infrared luminous galaxies that lie in the intermediate range between normal and starburst galaxies at z ~ 0.25-0.65 in the Cosmic Evolution Survey field to examine their gas content and star formation efficiency. We compare these quantities to the galaxies' deviation from the well-studied 'main sequence' (MS) correlation between star formation rate and stellar mass and find that at log(SFR/SFRMS) ≲ 0.6, a galaxy's distance to the main sequence is primarily driven by increased gas content, and not a more efficient star formation process. © 2018 The Author(s).

引用

页码：2124 / 2142

页数：18

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