The ALMA Spectroscopic Survey Large Program: The Infrared Excess ofz=1.5-10 UV-selected Galaxies and the Implied High-redshift Star Formation History
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We make use of sensitive (9.3 mu Jy beam(-1) rms) 1.2 mm continuum observations from the Atacama Large Millimeter/submillimeter Array (ALMA) Spectroscopic Survey in the Hubble Ultra-Deep Field (ASPECS) large program to probe dust-enshrouded star formation from 1362 Lyman-break galaxies spanning the redshift range z.=.1.5-10 (to similar to 7-28 M-circle dot yr(-1) at 4s over the entire range). We find that the fraction of ALMA-detected galaxies in our z.=.1.5-10 samples increases steeply with stellar mass, with the detection fraction rising from 0% at 10(9.0) M-circle dot to 85(-18)(+9) % at >10(10) M-circle dot. Moreover, on stacking all 1253 low-mass (10(9.5) M-circle dot and an SMC-like relation at lower masses. Using stellar mass and beta measurements for z similar to 2 galaxies over the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey, we derive a new empirical relation between beta and stellar mass and then use this correlation to show that our IRX-beta and IRX-stellar mass relations are consistent with each other. We then use these constraints to express the IRX as a bivariate function of beta and stellar mass. Finally, we present updated estimates of star formation rate density determinations at z > 3, leveraging present improvements in the measured IRX and recent probes of ultraluminous far-IR galaxies at z > 2.
Original language | English |
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Article number | 112 |
Journal | Astrophysical Journal |
Volume | 902 |
Issue number | 2 |
Number of pages | 29 |
ISSN | 0004-637X |
DOIs | |
Publication status | Published - 19 Oct 2020 |
- Lyman-break galaxies, Infrared excess, High-redshift galaxies, Dust continuum emission, Far infrared astronomy, ULTRA-DEEP FIELD, ULTRAVIOLET LUMINOSITY DENSITY, SPECTRAL ENERGY-DISTRIBUTIONS, LYMAN-BREAK GALAXIES, STELLAR MASS DENSITY, SIMILAR-TO 2, FORMING GALAXIES, DUST ATTENUATION, H-ALPHA, SUBMILLIMETER GALAXIES
Research areas
Links
- https://arxiv.org/abs/2009.10727
Submitted manuscript
ID: 253190624