Molecular gas in a gravitationally lensed galaxy group at z = 2.9
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Molecular gas in a gravitationally lensed galaxy group at z = 2.9. / Shen, Jeff; Man, Allison W. S.; Zabl, Johannes; Zhang, Zhi-Yu; Stockmann, Mikkel; Brammer, Gabriel; Whitaker, Katherine E.; Richard, Johan.
I: Astrophysical Journal, Bind 917, Nr. 2, 79, 19.08.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Molecular gas in a gravitationally lensed galaxy group at z = 2.9
AU - Shen, Jeff
AU - Man, Allison W. S.
AU - Zabl, Johannes
AU - Zhang, Zhi-Yu
AU - Stockmann, Mikkel
AU - Brammer, Gabriel
AU - Whitaker, Katherine E.
AU - Richard, Johan
PY - 2021/8/19
Y1 - 2021/8/19
N2 - Most molecular gas studies of z > 2.5 galaxies are of intrinsically bright objects, despite the galaxy population being primarily normal galaxies with less extreme star formation rates. Observations of normal galaxies at high redshift provide a more representative view of galaxy evolution and star formation, but such observations are challenging to obtain. In this work, we present Atacama Large Millimeter/submillimeter Array (CO)-C-12(J = 3 -> 2) observations of a submillimeter selected galaxy group at z = 2.9, resulting in spectroscopic confirmation of seven images from four member galaxies. These galaxies are strongly lensed by the MS 0451.6-0305 foreground cluster at z = 0.55, allowing us to probe the molecular gas content on levels of 10(9)-10(10) M (circle dot). Four detected galaxies have molecular gas masses of (0.2-13.1) x 10(10) M (circle dot), and the nondetected galaxies have inferred molecular gas masses of M (circle dot). We compare these new data to a compilation of 546 galaxies up to z = 5.3, and find that depletion times decrease with increasing redshift. We then compare the depletion times of galaxies in overdense environments to the field-scaling relation from the literature, and find that the depletion time evolution is steeper for galaxies in overdense environments than for those in the field. More molecular gas measurements of normal galaxies in overdense environments at higher redshifts (z > 2.5) are needed to verify the environmental dependence of star formation and gas depletion.
AB - Most molecular gas studies of z > 2.5 galaxies are of intrinsically bright objects, despite the galaxy population being primarily normal galaxies with less extreme star formation rates. Observations of normal galaxies at high redshift provide a more representative view of galaxy evolution and star formation, but such observations are challenging to obtain. In this work, we present Atacama Large Millimeter/submillimeter Array (CO)-C-12(J = 3 -> 2) observations of a submillimeter selected galaxy group at z = 2.9, resulting in spectroscopic confirmation of seven images from four member galaxies. These galaxies are strongly lensed by the MS 0451.6-0305 foreground cluster at z = 0.55, allowing us to probe the molecular gas content on levels of 10(9)-10(10) M (circle dot). Four detected galaxies have molecular gas masses of (0.2-13.1) x 10(10) M (circle dot), and the nondetected galaxies have inferred molecular gas masses of M (circle dot). We compare these new data to a compilation of 546 galaxies up to z = 5.3, and find that depletion times decrease with increasing redshift. We then compare the depletion times of galaxies in overdense environments to the field-scaling relation from the literature, and find that the depletion time evolution is steeper for galaxies in overdense environments than for those in the field. More molecular gas measurements of normal galaxies in overdense environments at higher redshifts (z > 2.5) are needed to verify the environmental dependence of star formation and gas depletion.
KW - FORMATION-DENSITY RELATION
KW - STAR-FORMING GALAXY
KW - SUBMILLIMETER GALAXY
KW - PHYSICAL-PROPERTIES
KW - INTERSTELLAR-MEDIUM
KW - SCALING RELATIONS
KW - DATA RELEASE
KW - CLUSTER
KW - REDSHIFT
KW - EVOLUTION
U2 - 10.3847/1538-4357/ac0435
DO - 10.3847/1538-4357/ac0435
M3 - Journal article
VL - 917
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 79
ER -
ID: 276698081