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Title: | ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The Infrared Excess of UV-Selected z = 2-10 Galaxies as a Function of UV-Continuum Slope and Stellar Mass | Authors: | Bouwens, Rychard J. Aravena, Manuel DECARLI, ROBERTO Walter, Fabian Labbé, Ivo Bauer, Franz E. Bertoldi, Frank Carilli, Chris Chapman, Scott Daddi, Emanuele Hodge, Jacqueline Ivison, Rob J. Karim, Alex Le Fevre, Olivier Magnelli, Benjamin Ota, Kazuaki Riechers, Dominik Smail, Ian R. van der Werf, Paul Weiss, Axel Cox, Pierre Elbaz, David Gonzalez-Lopez, Jorge Infante, Leopoldo Oesch, Pascal Wagg, Jeff Wilkins, Steve |
Issue Date: | 2016 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 833 | Issue: | 1 | First Page: | 72 | Abstract: | We make use of deep 1.2 mm continuum observations (12.7 μJy beam<SUP>-1</SUP> rms) of a 1 arcmin<SUP>2</SUP> region in the Hubble Ultra Deep Field to probe dust-enshrouded star formation from 330 Lyman-break galaxies spanning the redshift range z = 2-10 (to ∼2-3 M <SUB>☉</SUB> yr<SUP>-1</SUP> at 1σ over the entire range). Given the depth and area of ASPECS, we would expect to tentatively detect 35 galaxies, extrapolating the Meurer z ∼ 0 IRX-β relation to z ≥ 2 (assuming dust temperature T <SUB> d </SUB> ∼ 35 K). However, only six tentative detections are found at z ≳ 2 in ASPECS, with just three at >3σ. Subdividing our z = 2-10 galaxy samples according to stellar mass, UV luminosity, and UV-continuum slope and stacking the results, we find a significant detection only in the most massive (>10<SUP>9.75</SUP> M <SUB>☉</SUB>) subsample, with an infrared excess (IRX = L <SUB>IR</SUB>/L <SUB>UV</SUB>) consistent with previous z ∼ 2 results. However, the infrared excess we measure from our large selection of sub-L <SUP>∗</SUP> (<10<SUP>9.75</SUP> M <SUB>☉</SUB>) galaxies is {0.11}<SUB>-0.42</SUB><SUP>+0.32</SUP> ± 0.34 (bootstrap and formal uncertainties) and {0.14}<SUB>-0.14</SUB><SUP>+0.15</SUP> ± 0.18 at z = 2-3 and z = 4-10, respectively, lying below even an IRX-β relation for the Small Magellanic Cloud (95% confidence). These results demonstrate the relevance of stellar mass for predicting the IR luminosity of z ≳ 2 galaxies. We find that the evolution of the IRX-stellar mass relationship depends on the evolution of the dust temperature. If the dust temperature increases monotonically with redshift (\propto {(1+z)}<SUP>0.32</SUP>) such that T <SUB> d </SUB> ∼ 44-50 K at z ≥ 4, current results are suggestive of little evolution in this relationship to z ∼ 6. We use these results to revisit recent estimates of the z ≥ 3 star formation rate density. | URI: | http://hdl.handle.net/20.500.12386/26255 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/833/1/72 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/833/1/72 | Bibcode ADS: | 2016ApJ...833...72B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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J._Bouwens_2016_ApJ_833_72.pdf | Pdf editoriale | 2.71 MB | Adobe PDF | View/Open |
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