期刊
ASTROPHYSICAL JOURNAL
卷 822, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/822/2/80
关键词
cosmology: observations; early universe; galaxies: evolution; galaxies: high-redshift; ISM: molecules
资金
- International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne
- FONDECYT [1140099]
- U.S. National Science Foundation [AST-1312950]
- Herschel [OT1_jvieira_4, DDT_mstrande_1]
- Commonwealth of Australia
- VLT/X-Shooter under the ESO project [E-092.A-0503(A)]
- National Science Foundation [PLR-1248097]
- Kavli Foundation
- Gordon and Betty Moore Foundation [GBMF 947]
- [E-086. A-0793A-2010]
- [M-085.F-0008-2010]
- [M-087.F-0015-2011]
- [M-091.F-0031-2013]
- [E-094.A-0712A-2014]
- [M-095.F-0028-2015]
- [E-096.A-0939A-2015]
- [PHY-1125897]
- STFC [ST/I005544/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1312950] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125897] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1248097] Funding Source: National Science Foundation
We use the Atacama Large Millimeter/submillimeter Array (ALMA) in Cycle 1 to determine spectroscopic redshifts of high-redshift dusty star-forming galaxies (DSFGs) selected by their 1.4 mm continuum emission in the South Pole Telescope (SPT) survey. We present ALMA 3 mm spectral scans between 84 and 114 GHz for 15 galaxies and targeted ALMA 1 mm observations for an additional eight sources. Our observations yield 30 new line detections from CO, [CI], [NII], H2O and NH3. We further present Atacama Pathfinder Experiment [CII] and CO mid-J observations for seven sources for which only a single line was detected in spectral-scan data from ALMA Cycle 0 or Cycle 1. We combine the new observations with previously published and new millimeter/submillimeter line and photometric data of the SPT-selected DSFGs to study their redshift distribution. The combined data yield 39 spectroscopic redshifts from molecular lines, a success rate of >85%. Our sample represents the largest data set of its kind today and has the highest spectroscopic completeness among all redshift surveys of high-z DSFGs. The median of the redshift distribution is z = 3.9 +/- 0.4, and the highest-redshift source in our sample is at z = 5.8. We discuss how the selection of our sources affects the redshift distribution, focusing on source brightness, selection wavelength, and strong gravitational lensing. We correct for the effect of gravitational lensing and find the redshift distribution for 1.4 mm selected sources with a median redshift of z = 3.1 +/- 0.3. Comparing to redshift distributions selected at shorter wavelengths from the literature, we show that selection wavelength affects the shape of the redshift distribution.
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