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Characterizing Faint Submillimeter Galaxies with Cluster Lensing.

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Title:Characterizing Faint Submillimeter Galaxies with Cluster Lensing.
Authors:Hsu, Li-Yen
Contributors:Astronomy (department)
Date Issued:Dec 2017
Publisher:University of Hawaiʻi at Mānoa
Abstract:Based on the measurements of the integrated background light from extragalactic
sources, it is known that about half of the starlight is absorbed by dust and re-radiated into
the far-infrared (FIR). It is therefore important to study both the unobscured and dustobscured
populations of galaxies across cosmic time for a full picture of the star formation
in our universe. At z > 1, the FIR emission from galaxies is redshifted to the submillimeter.
However, surveys made with single-dish submillimeter telescopes are confusion limited at
uxes (< 2 mJy at 850 m) and can only detect ultra-luminous galaxies. Consequently,
we have little information about fainter submillimeter galaxies (SMGs), which are actually
the major contributors to the submillimeter background light and therefore the dominant
star-formers in the dusty universe. Determining how much these faint SMGs overlap the
optically selected samples is critical to fully account for the cosmic star formation history.
Observations of massive cluster elds are the best way to study faint galaxies, thanks to
gravitational lensing. To explore the faint submillimeter population, we have been observing
nine galaxy clusters with the SCUBA-2 camera on the James Clerk Maxwell Telescope. We
also used interferometric observations with the Karl G. Jansky Very Large Array and the
Submillimeter Array to determine the accurate positions of our detected sources. Our
observations have discovered a population of faint SMGs that are undetected in deep radio,
optical, and near-infrared images. This suggests that a signi cant fraction of the galaxies
with infrared luminosities < 1012L may be hidden from optical surveys and would not be
included in the UV star formation history.
Description:Ph.D. Thesis. University of Hawaiʻi at Mānoa 2017.
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: Ph.D. - Astronomy

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