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Discovery of Four Apparently Cold Dusty Galaxies at z=3.62-5.85 in the COSMOS Field: Direct Evidence of Cosmic Microwave Background Impact on High-redshift Galaxy Observables
Jin, S.1,2,3,4,5; Daddi, E.2; Magdis, G. E.6,7,8,9; Liu, D.10; Schinnerer, E.10; Papadopoulos, P. P.11,12; Gu, Q.1,5; Gao, Y.13; Calabro, A.2
2019-12-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume887Issue:2Pages:15
Corresponding AuthorJin, S.(shuowen.jin@gmail.com)
AbstractWe report Atacama Large Millimeter Array (ALMA) observations of four high-redshift dusty star-forming galaxy candidates selected from far-infrared (FIR)/submillimeter observations in the COSMOS field. We securely detect all galaxies in the continuum and spectroscopically confirm them at z = 3.62-5.85 using ALMA 3 mm line scans, detecting multiple CO and/or [C I] transitions. This includes the most distant dusty galaxy currently known in the COSMOS field, ID85001929 at z = 5.847. These redshifts are lower than we had expected, as these galaxies have substantially colder dust temperatures (i.e., their spectral energy distributions peak at longer rest-frame wavelengths) than most literature sources at z > 4. The observed cold dust temperatures are best understood as evidence for optically thick dust continuum in the FIR, rather than the result of low star formation efficiency with rapid metal enrichment. We provide direct evidence that, given their cold spectral energy distributions, cosmic microwave background (CMB) plays a significant role in biasing their observed Rayleigh-Jeans (RJ) slopes to unlikely steep values and, possibly, reducing their CO fluxes by a factor of two. We recover standard RJ slopes when the CMB contribution is taken into account. High-resolution ALMA imaging shows compact morphology and evidence for mergers. This work reveals a population of cold dusty star-forming galaxies that were underrepresented in current surveys and are even colder than typical main-sequence galaxies at the same redshift. High FIR dust optical depth might be a widespread feature of compact starbursts at any redshift.
DOI10.3847/1538-4357/ab55d6
WOS KeywordSTAR-FORMATION HISTORY ; STARBURST GALAXIES ; LEGACY SURVEY ; LINES ; EMISSION ; HERSCHEL ; UNIVERSE ; DEG(2) ; BRIGHT ; ALMA
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000506012000038
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35563
Collection中国科学院紫金山天文台
Corresponding AuthorJin, S.
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
2.Univ Paris, CNRS, CEA, IRFU,DAp,AIM,Univ Paris Saclay, F-91191 Gif Sur Yvette, France
3.IAC, E-38205 San Cristobal la Laguna, Tenerife, Spain
4.Univ La Laguna, Dpto Astrofis, E-38206 San Cristobal la Laguna, Tenerife, Spain
5.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing, Jiangsu, Peoples R China
6.Univ Copenhagen, Niels Bohr Inst, Cosm Dawn Ctr, Copenhagen, Denmark
7.Tech Univ Denmark, DTU Space, Lyngby, Denmark
8.Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
9.Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Athens 15236, Greece
10.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
11.Aristotle Univ Thessaloniki, Dept Phys, Sect Astrophys Astron & Mech, Thessaloniki 54124, Greece
12.Acad Athens, Res Ctr Astron, Soranou Efesiou 4, GR-11527 Athens, Greece
13.Chinese Acad Sci, Purple Mt Observ, Key Lab Radio Astron, 8 Yuanhua Rd, Nanjing 210034, Peoples R China
Recommended Citation
GB/T 7714
Jin, S.,Daddi, E.,Magdis, G. E.,et al. Discovery of Four Apparently Cold Dusty Galaxies at z=3.62-5.85 in the COSMOS Field: Direct Evidence of Cosmic Microwave Background Impact on High-redshift Galaxy Observables[J]. ASTROPHYSICAL JOURNAL,2019,887(2):15.
APA Jin, S..,Daddi, E..,Magdis, G. E..,Liu, D..,Schinnerer, E..,...&Calabro, A..(2019).Discovery of Four Apparently Cold Dusty Galaxies at z=3.62-5.85 in the COSMOS Field: Direct Evidence of Cosmic Microwave Background Impact on High-redshift Galaxy Observables.ASTROPHYSICAL JOURNAL,887(2),15.
MLA Jin, S.,et al."Discovery of Four Apparently Cold Dusty Galaxies at z=3.62-5.85 in the COSMOS Field: Direct Evidence of Cosmic Microwave Background Impact on High-redshift Galaxy Observables".ASTROPHYSICAL JOURNAL 887.2(2019):15.
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