2020ApJ...890...24V


Query : 2020ApJ...890...24V

2020ApJ...890...24V - Astrophys. J., 890, 24-24 (2020/February-2)

The properties of the interstellar medium of galaxies across time as traced by the neutral atomic carbon [C I].

VALENTINO F., MAGDIS G.E., DADDI E., LIU D., ARAVENA M., BOURNAUD F., CORTZEN I., GAO Y., JIN S., JUNEAU S., KARTALTEPE J.S., KOKOREV V., LEE M.-Y., MADDEN S.C., NARAYANAN D., POPPING G. and PUGLISI A.

Abstract (from CDS):

We report Atacama Large Millimeter Array observations of the neutral atomic carbon transitions [C I] and multiple CO lines in a sample of ∼30 main-sequence galaxies at z∼1, including novel information on [C I](3P23P1) and CO (7–6) for 7 of such normal objects. We complement our observations with a collection of >200 galaxies with coverage of similar transitions, spanning the z = 0-4 redshift interval and a variety of ambient conditions from local to high-redshift starbursts. We find systematic variations in the [C I]/IR and [C I]/high-Jupper (Jupper = 7) CO luminosity ratios among the various samples. We interpret these differences as increased dense molecular gas fractions and star formation efficiencies in the strongest high-redshift starbursts with respect to normal main-sequence galaxies. We further report constant L[CI]3P2–3P1^′/L[CI]3P1-3P0_^′^ ratios across the galaxy populations and redshifts, suggesting that gas temperatures Texc traced by [C I] do not strongly vary. We find only a mild correlation with Tdust and that, generally, Texc <= Tdust. We fit the line ratios with classical photodissociation region models, retrieving consistently larger densities and intensities of the UV radiation fields in submillimeter galaxies than in main-sequence and local objects. However, these simple models fall short in representing the complexity of a multiphase interstellar medium and should be treated with caution. Finally, we compare our observations with the Santa Cruz semi-analytical model of galaxy evolution, recently extended to simulate submillimeter emission. While we confirm the success in reproducing the CO lines, we find systematically larger [C I] luminosities at fixed IR luminosity than predicted theoretically. This highlights the necessity of improving our understanding of the mechanisms regulating the [C I] emission on galactic scales. We release our data compilation to the community.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy evolution - High-redshift galaxies - Starburst galaxies - Ultraluminous infrared galaxies - Submillimeter astronomy - Interstellar medium - Star formation

Status at CDS : Large table(s) of objects being ingested in VizieR.

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 CXOCDFS J033231.5-274624 AGN 03 32 31.46027 -27 46 23.1871 25.05 23.96 23.64 23.28 23.001 ~ 90 0
2 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2320 0
3 NAME SMM J123711+622212 AGN 12 37 11.89 +62 22 12.7   27.1786 25.185   24.4196 ~ 169 0

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2021.08.03-11:42:17

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