Are High-redshift Galaxies Hot? Temperature of z > 5 Galaxies and Implications for Their Dust Properties

被引：97

作者：

Faisst, Andreas L. ^{[1
]}

Capak, Peter L. ^{[1
]}

Yan, Lin ^{[2
]}

Pavesi, Riccardo ^{[3
]}

Riechers, Dominik A. ^{[3
]}

Barisic, Ivana ^{[4
]}

Cooke, Kevin C. ^{[5
]}

Kartaltepe, Jeyhan S. ^{[5
]}

Masters, Daniel C. ^{[1
]}

机构：

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

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

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

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

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

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 847卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

dust; extinction; galaxies: formation; galaxies: ISM; STAR-FORMING GALAXIES; SIMILAR-TO; 2; ALMA SPECTROSCOPIC SURVEY; MASS-METALLICITY RELATION; ACTIVE GALACTIC NUCLEI; EMISSION-LINE RATIOS; UV-CONTINUUM SLOPE; ULTRA DEEP FIELD; INTERSTELLAR EXTINCTION; STELLAR POPULATIONS;

D O I：

10.3847/1538-4357/aa886c

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent studies have found a significant evolution and scatter in the relationship between the UV spectral slope (beta(UV)) and the infrared excess (IRX; L-IR/L-UV) at z > 4, suggesting different dust properties of these galaxies. The total far-infrared (FIR) luminosity is key for this analysis, but it is poorly constrained in normal (main-sequence) star-forming z > 5 galaxies, where often only one single FIR point is available. To better inform estimates of the FIR luminosity, we construct a sample of local galaxies and three low-redshift analogues of z > 5 systems. The trends in this sample suggest that normal high-redshift galaxies have a warmer infrared (IR) spectral energy distribution (SED) compared to average z < 4 galaxies that are used as priors in these studies. The blueshifted peak and mid-IR excess emission could be explained by a combination of a larger fraction of metal-poor interstellar medium being optically thin to ultraviolet (UV) light and a stronger UV radiation field due to high star formation densities. Assuming a maximally warm IR SED suggests a 0.6 dex increase in total FIR luminosities, which removes some tension between the dust attenuation models and observations of the IRX-beta. relation at z > 5. Despite this, some galaxies still fall below the minimum IRX -beta relation derived with standard dust cloud models. We propose that radiation pressure in these highly star-forming galaxies causes a spatial offset between dust clouds and young star-forming regions within the lifetime of O/B stars. These offsets change the radiation balance and create viewing-angle effects that can change UV colors at fixed IRX. We provide a modified model that can explain the location of these galaxies on the IRX-beta diagram.

引用

页数：28

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