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Molecular Gas Excitation in z ∼ 0.7 Gas-rich Poststarburst Galaxies from SQuIGGL→E
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DOI：10.3847/1538-4357/ae64e7.png)
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Abstract
En 中文
Many poststarburst galaxies at z similar to 0.7 have been shown to retain substantial molecular gas reservoirs yet host low ongoing star formation, suggesting that the remaining gas may be inefficient at forming stars during the early postburst phase. We present new Atacama Large Millimeter/submillimeter Array CO(5-4) observations of nine gas-rich poststarburst galaxies at z similar to 0.7 from the Studying Quenching in Intermediate-z Galaxies: Gas, angu L -> ar momentum, and Evolution (SQuIGG L -> E) survey, providing a view of the molecular gas excitation in these systems. Combined with existing CO(2-1) data, we detect CO(5-4) in eight out of nine targets and find that most have moderate CO excitation with r52 equivalent to LCO(5-4)'/LCO(2-1)'approximate to 0.1-0.3 . These systems show no clear trend between r52 and either total or surface-density of star formation. Specifically, all objects have Sigma SFR similar to 0.01-1 M circle dot yr-1 kpc-2, consistent with compact, modest star formation, even when allowing for buried activity, as these galaxies decline from their peak. One object, J1448+1010, which has clear optical, mid-infrared, and radio indicators of an active galactic nucleus, is an outlier with r52 approximate to 0.6; its elevated excitation likely requires significant nonstellar heating, with a contribution from potentially obscured star formation. Together, most gas-rich SQuIGG L -> E poststarbursts have moderately excited molecular gas alongside little to modest star-forming activity, indicating that the remaining gas hosts relatively suppressed star formation efficiencies instead of strong buried starburst activity.
Keywords:
RECENTLY QUENCHED GALAXIES
STAR-FORMATION HISTORIES
POST-STARBURST GALAXIES
ACTIVE GALACTIC NUCLEI
MASSIVE GALAXIES
BLACK-HOLES
INTERSTELLAR-MEDIUM
ATLAS(3D) PROJECT
MERGER HISTORY
HIGH-REDSHIFT
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5.4
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8.3W
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32.0W
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