S.C. Chapman
A blind CO detection of a distant red galaxy in the HS1700+64 protocluster
Chapman, S.C.; Bertoldi, F.; Smail, I.; Blain, A.W.; Geach, J.E.; Gurwell, M.; Ivison, R.J.; Petitpas, G.R.; Reddy, N.; Steidel, C.C.
Authors
F. Bertoldi
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
A.W. Blain
J.E. Geach
M. Gurwell
R.J. Ivison
G.R. Petitpas
N. Reddy
C.C. Steidel
Abstract
We report the blind detection of 12CO emission from a distant red galaxy, HS1700.DRG55. We have used the IRAM Plateau de Bure Interferometer WideX, with its 3.6 GHz of instantaneous dual-polarization bandwidth, to target 12CO(3–2) from galaxies lying in the protocluster at z = 2.300 in the field HS1700+64. If indeed this line in DRG55 is 12CO(3–2), its detection at 104.9 GHz indicates zCO = 2.296. None of the other eight known z ∼ 2.30 protocluster galaxies lying within the primary beam (PB) are detected in 12CO, although the limits are ∼2 × worse towards the edge of the PB where several lie. The optical/near-IR magnitudes of DRG55 (RAB > 27, KAB = 22.3) mean that optical spectroscopic redshifts are difficult with 10-m-class telescopes, but near-IR redshifts would be feasible. The 24-μm-implied star formation rate (210 M⊙ yr−1), stellar mass (∼1011 M⊙) and 12CO line luminosity (3.6 × 1010 K km s−1 pc2) are comparable to other normal 12CO-detected star-forming galaxies in the literature, although the galaxy is some ∼2 mag (∼6 ×) fainter in the rest-frame UV than 12CO-detected galaxies at z > 2. The detection of DRG55 in 12CO complements three other 12CO detected UV-bright galaxies in this protocluster from previous studies, and suggests that many optically faint galaxies in the protocluster may host substantial molecular gas reservoirs, and a full blind census of 12CO in this overdense environment is warranted.
Citation
Chapman, S., Bertoldi, F., Smail, I., Blain, A., Geach, J., Gurwell, M., …Steidel, C. (2015). A blind CO detection of a distant red galaxy in the HS1700+64 protocluster. Monthly Notices of the Royal Astronomical Society: Letters, 449(1), L68-L72. https://doi.org/10.1093/mnrasl/slv010
Journal Article Type | Article |
---|---|
Acceptance Date | Jan 19, 2015 |
Publication Date | May 1, 2015 |
Deposit Date | Feb 16, 2016 |
Publicly Available Date | Feb 22, 2016 |
Journal | Monthly Notices of the Royal Astronomical Society: Letters |
Electronic ISSN | 1745-3933 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 449 |
Issue | 1 |
Pages | L68-L72 |
DOI | https://doi.org/10.1093/mnrasl/slv010 |
Keywords | ISM: molecules, Galaxies: clusters: general, Galaxies: high-redshift, Galaxies: starburst. |
Related Public URLs | http://adsabs.harvard.edu/abs/2015MNRAS.449L..68C |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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