Bibcode
Brisbin, Drew; Aravena, Manuel; Daddi, Emanuele; Dannerbauer, Helmut; Decarli, Roberto; González-López, Jorge; Riechers, Dominik; Wagg, Jeff
Referencia bibliográfica
Astronomy and Astrophysics, Volume 628, id.A104, 8 pp.
Fecha de publicación:
8
2019
Revista
Número de citas
17
Número de citas referidas
16
Descripción
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
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Helmut
Dannerbauer