The Impact of Far-Infrared/Sub-Millimeter Data on the Star Formation Rates of Massive Dusty Galaxies at Cosmic Noon
Compendium of Undergraduate Research in Astronomy and Space Science(2023)
摘要
We explore how the star formation rate (SFR), stellar mass, and other
properties of massive dusty galaxies at cosmic noon are impacted when
far-infrared (FIR)/sub-millimeter data are added to datasets containing only
ultraviolet (UV) to near-infrared (NIR) data. For a sample of 92 massive
(stellar mass $> 4{\times}10^{10}$ M$_{\odot}$) dusty galaxies at
$z\,{\sim}\,1.5$ to 3.0 (corresponding to ${\sim}25$% of cosmic history), we
fit the spectral energy distributions (SEDs) based on DECam UV-to-optical data,
VICS82, NEWFIRM, and Spitzer-IRAC NIR data, and Herschel-SPIRE
FIR/sub-millimeter data using the Bayesian Analysis of Galaxies for Physical
Inference and Parameter Estimation (BAGPIPES) SED-fitting code. We assume a
delayed tau star formation history with a log$_{10}$ prior on tau and derive
the posterior distributions of stellar mass, SFR, extinction, and specific SFR.
We find that adding FIR/sub-millimeter data leads to SFR estimates that can be
both significantly higher or lower (typically by up to a factor of 10) than
estimates based on UV-to-NIR data alone, depending on the type of galaxies
involved. We find that the changes in SFR scale with changes in extinction.
These results highlight the importance of including FIR/sub-millimeter data in
order to accurately derive the SFRs of massive dusty galaxies at
$z\,{\sim}\,2$.
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