Journal
ASTROPHYSICAL JOURNAL
Volume 941, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac9ea6
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Funding
- INSU/CNRS (France)
- MPG (Germany)
- IGN (Spain)
- FIRST program from the Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS), Japan Science and Technology Agency (JST)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- National Science Foundation
- University of Maryland, Eotvos Lorand University (ELTE)
- Los Alamos National Laboratory
- Gordon and Betty Moore Foundation
- DPAC
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- KAKENHI through the Japan Society for the Promotion of Science (JSPS)
- Joint research program of the Institute for Cosmic Ray Research (ICRR), University of Tokyo
- ERC Advanced Grant INTERSTELLAR
- Carl Friedrich von Siemens-Forschungspreis der Alexander von Humboldt-Stiftung Research Award
- NAOJ ALMA Scientific Research
- Leading Initiative for Excellent Young Researchers, MEXT, Japan
- [20K22358]
- [HJH02007]
- [AST-1238877]
- [15K17602]
- [15H02064]
- [17H01110]
- [17H01114]
- [19K14752]
- [20H00180]
- [21H04467]
- [H2020/740120]
- [2020-16B]
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We present new observations of three luminous Lyman-break galaxies using ALMA, and find a marginal detection of CO(6-5) emission in one galaxy. We also obtain constraints on gas mass and gas surface density, and find that one galaxy has a high hydrogen density comparable to low-z (U)LIRGs, quasars, and Galactic star-forming regions, while the other two galaxies have lower hydrogen densities consistent with local star-forming galaxies. The results are consistent with previous studies and reveal valuable information about the properties of these galaxies.
We present our new Atacama Large Millimeter/submillimeter Array (ALMA) observations targeting CO(6-5) emission from three luminous Lyman-break galaxies (LBGs) at z (spec) = 6.0293-6.2037 found in the Subaru/Hyper Suprime-Cam survey, whose [O iii] 88 mu m and [C ii] 158 mu m emissions have been detected with ALMA. We find a marginal detection of the CO(6-5) line from one of our LBGs, J0235-0532, at the similar or equal to 4 sigma significance level and obtain upper limits for the other two LBGs, J1211-0118 and J0217-0208. Our z = 6 luminous LBGs are consistent with the previously found correlation between the CO luminosity and the infrared luminosity. The unique ensemble of the multiple far-infrared emission lines and underlying continuum fed to a photodissociation region model reveals that J0235-0532 has a relatively high density of hydrogen nuclei n (H) that is comparable to those of low-z (U)LIRGs, quasars, and Galactic star-forming regions with high n (H) values, while the other two LBGs have lower n (H) consistent with local star-forming galaxies. By carefully taking account of various uncertainties, we obtain constraints on total gas mass and gas surface density from their CO luminosity measurements. We find that J0235-0532 is located below the Kennicutt-Schmidt (KS) relation, comparable to the z = 5.7 LBG, HZ10, previously detected with CO(2-1). Combined with previous results for dusty starbursts at similar redshifts, the KS relation at z = 5-6 is on average consistent with the local one.
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