Bibcode
Brisbin, Drew; Aravena, Manuel; Daddi, Emanuele; Dannerbauer, Helmut; Decarli, Roberto; González-López, Jorge; Riechers, Dominik; Wagg, Jeff
Bibliographical reference
Astronomy and Astrophysics, Volume 628, id.A104, 8 pp.
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8
2019
Journal
Citations
17
Refereed citations
16
Description
We used the Plateau De Bure Interferometer to observe multiple CO and
neutral carbon transitions in a z = 2.2 main sequence disk galaxy,
BX610. Our observation of CO(7-6), CO(4-3), and both far-infrared (FIR)
[CI] lines complements previous observations of Hα and low-J CO,
and reveals a galaxy that is vigorously forming stars with UV fields
(Log(GG0-1) ≲ 3.25); although less vigorously
than local ultra-luminous infrared galaxies or most starbursting
submillimeter galaxies in the early universe. Our observations allow new
independent estimates of the cold gas mass which indicate
Mgas ˜ 2 × 1011 M⊙, and
suggest a modestly larger αCO value of ˜8.2. The
corresponding gas depletion timescale is ˜1.5 Gyr. In addition to
gas of modest density (Log(n cm3) ≲ 3) heated by star
formation, BX610 shows evidence for a significant second gas component
responsible for the strong high-J CO emission. This second component
might either be a high-density molecular gas component heated by star
formation in a typical photodissociation region, or could be molecular
gas excited by low-velocity C shocks. The CO(7-6)-to-FIR luminosity
ratio we observe is significantly higher than typical star-forming
galaxies and suggests that CO(7-6) is not a reliable star-formation
tracer in this galaxy.
The reduced spectra are only available at the CDS via anonymous ftp to
http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/628/A104
Related projects
Molecular Gas and Dust in Galaxies Across Cosmic Time
Two of the most fundamental questions in astrophysics are the conversion of molecular gas into stars and how this physical process is a function of environments on all scales, ranging from planetary systems, stellar clusters, galaxies to galaxy clusters. The main goal of this internal project is to get insight into the formation and evolution of
Helmut
Dannerbauer