Dust Properties of C II Detected z ∼ 5.5 Galaxies: New HST/WFC3 Near-IR Observations

被引：43

作者：

Barisic, I. ^{[1
,2
]}

Faisst, A. L. ^{[3
]}

Capak, P. L. ^{[3
]}

Pavesi, R. ^{[4
]}

Riechers, D. A. ^{[4
]}

Scoville, N. Z. ^{[5
]}

Cooke, K. ^{[6
]}

Kartaltepe, J. S. ^{[6
]}

Casey, C. M. ^{[7
]}

Smolcic, V. ^{[1
]}

机构：

[1] Univ Zagreb, Fac Sci, Dept Phys, Bijenicka Cesta 32, Zagreb 10000, Croatia

[2] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[3] CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA

[4] Cornell Univ, Dept Astron, Space Sci Bldg, Ithaca, NY 14853 USA

[5] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[6] Rochester Inst Technol, Sch Phys & Astron, 84 Lomb Mem Dr, Rochester, NY 14623 USA

[7] Univ Texas Austin, Dept Astron, 2515 Speedway Blvd,Stop C1400, Austin, TX 78712 USA

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 845卷 / 01期

基金：

美国国家科学基金会;

关键词：

dust; extinction; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: ISM; HIGH-REDSHIFT GALAXIES; STAR-FORMING GALAXIES; EMISSION; ABSORPTION; SLOPES; ALMA;

D O I：

10.3847/1538-4357/aa7eda

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examine the rest-frame ultraviolet (UV) properties of 10 [C II]lambda 158 mu m-detected galaxies at z similar to 5.5 in COSMOS using new Hubble Space Telescope/Wide Field Camera 3 near-infrared imaging. Together with preexisting 158 mu m continuum and [C II]. line measurements by the Atacama Large Millimeter/submillimeter Array, we study their dust attenuation properties on the IRX-beta diagram, which connects the total dust emission (alpha IRX= log(L-FIR/L-1600)) to the line-of-sight dust column (alpha beta). We find systematically bluer UV continuum spectral slopes (beta) compared to previous low-resolution ground-based measurements, which relieves some of the tension between models of dust attenuation and observations at high redshifts. While most of the galaxies are consistent with local starburst or Small Magellanic Cloud-like dust properties, we find galaxies with low IRX values and a large range in beta that cannot be explained by models of a uniform dust distribution well mixed with stars. A stacking analysis of Keck/DEIMOS optical spectra indicates that these galaxies are metal-poor with young stellar populations that could significantly alter their spatial dust distribution.

引用

页数：7

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