A Controlled Study of Cold Dust Content in Galaxies from z = 0-2

July 2017 • 2017ApJ...843...71K

Authors • Kirkpatrick, Allison • Pope, Alexandra • Sajina, Anna • Dale, Daniel A. • Díaz-Santos, Tanio • Hayward, Christopher C. • Shi, Yong • Somerville, Rachel S. • Stierwalt, Sabrina • Armus, Lee • Kartaltepe, Jeyhan S. • Kocevski, Dale D. • McIntosh, Daniel H. • Sanders, David B. • Yan, Lin

Abstract • At z=1{--}3, the formation of new stars is dominated by dusty galaxies whose far-IR emission indicates they contain colder dust than local galaxies of a similar luminosity. We explore the reasons for the evolving IR emission of similar galaxies over cosmic time using (1) local galaxies from GOALS ({L}_{IR}={10}¹¹{--}{10}¹² {L}_⊙ ), (2) galaxies at z∼ 0.1{--}0.5 from 5MUSES ({L}_{IR}={10}¹⁰{--}{10}¹² {L}_⊙ ), and (3) IR luminous galaxies spanning z=0.5{--}3 from GOODS and Spitzer xFLS ({L}_{IR}> {10}¹¹ {L}_⊙ ). All samples have Spitzer mid-IR spectra, and Herschel and ground-based submillimeter imaging covering the full IR spectral energy distribution, allowing us to robustly measure {L}_{IR}^{SF}, {T}_{dust}, and {M}_{dust} for every galaxy. Despite similar infrared luminosities, z> 0.5 dusty star-forming galaxies (DSFG) have a factor of 5 higher dust masses and 5 K colder temperatures. The increase in dust mass is linked to an increase in the gas fractions with redshift, and we do not observe a similar increase in stellar mass or star formation efficiency. {L}₁₆₀^{SF}/{L}₇₀^{SF}, a proxy for {T}_{dust}, is strongly correlated with {L}_{IR}^{SF}/{M}_{dust} independently of redshift. We measure merger classification and galaxy size for a subsample, and there is no obvious correlation between these parameters and {L}_{IR}^{SF}/{M}_{dust} or {L}₁₆₀^{SF}/{L}₇₀^{SF}. In DSFG, the change in {L}_{IR}^{SF}/{M}_{dust} can fully account for the observed colder dust temperatures, suggesting that any change in the spatial extent of the interstellar medium is a second-order effect.

Links

• PREPRINT http://arxiv.org/abs/1705.10846
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/2017ApJ...843...71K
• ELECTR https://doi.org/10.3847%2F1538-4357%2Faa76dc
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• PDF https://iopscience.iop.org/article/10.3847/1538-4357/aa76dc/pdf
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