期刊
ASTROPHYSICAL JOURNAL
卷 767, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/767/1/88
关键词
cosmology: observations; early universe; galaxies: evolution; galaxies: high-redshift; ISM: molecules
资金
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009012] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1125897] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/I005544/1, ST/H00243X/1, ST/J000647/1, ST/K003119/1] Funding Source: researchfish
- STFC [ST/K003119/1, ST/I005544/1, ST/J000647/1] Funding Source: UKRI
Using the Atacama Large Millimeter/submillimeter Array, we have conducted a blind redshift survey in the 3 mm atmospheric transmission window for 26 strongly lensed dusty star- forming galaxies (DSFGs) selected with the South Pole Telescope. The sources were selected to have S-1.4mm > 20 mJy and a dust- like spectrum and, to remove low- z sources, not have bright radio (S-843MHz < 6 mJy) or far- infrared counterparts (S100 mu m < 1 Jy, S-60 mu m < 200 mJy). We robustly detect 44 line features in our survey, which we identify as redshifted emission lines of (CO)-C-12, (CO)-C-13, CI, H2O, and H2O+. We find one or more spectral features in 23 sources yielding a similar to 90% detection rate for this survey; in 12 of these sources we detect multiple lines, while in 11 sources we detect only a single line. For the sources with only one detected line, we break the redshift degeneracy with additional spectroscopic observations if available, or infer the most likely line identification based on photometric data. This yields secure redshifts for similar to 70% of the sample. The three sources with no lines detected are tentatively placed in the redshift desert between 1.7< z< 2.0. The resulting mean redshift of our sample is z = 3.5. This finding is in contrast to the redshift distribution of radio- identified DSFGs, which have a significantly lower mean redshift of z = 2.3 and for which only 10%- 15% of the population is expected to be at z> 3. We discuss the effect of gravitational lensing on the redshift distribution and compare our measured redshift distribution to that of models in the literature.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据