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Published March 1, 2017 | Published + Submitted
Journal Article Open

Physical Properties of Sub-galactic Clumps at 0.5 ≤ Z ≤ 1.5 in the UVUDF

Abstract

We present an investigation of clumpy galaxies in the Hubble Ultra Deep Field at 05 ≤ z ≤ 1.5 in the rest-frame far-ultraviolet (FUV) using Hubble Space Telescope Wide Field Camera 3 broadband imaging in F225W, F275W, and F336W. An analysis of 1404 galaxies yields 209 galaxies that host 403 kpc scale clumps. These host galaxies appear to be typical star-forming galaxies, with an average of 2 clumps per galaxy and reaching a maximum of 8 clumps. We measure the photometry of the clumps and determine the mass, age, and star formation rates (SFR) using the spectral energy distribution fitting code FAST. We find that clumps make an average contribution of 19% to the total rest-frame FUV flux of their host galaxy. Individually, clumps contribute a median of 5% to the host galaxy SFR and an average of ~4% to the host galaxy mass, with total clump contributions to the host galaxy stellar mass ranging widely from lower than 1% up to 93%. Clumps in the outskirts of galaxies are typically younger, with higher SFRs, than clumps in the inner regions. The results are consistent with clump migration theories in which clumps form through violent gravitational instabilities in gas-rich turbulent disks, eventually migrate toward the center of the galaxies, and coalesce into the bulge.

Additional Information

© 2017 The American Astronomical Society. Received 2016 June 17; accepted 2017 January 30; published 2017 February 27. We would like to thank B. Elmegreen for making the UDF clump data from Elmegreen et al. (2013) available for Figure 6. We also thank K. Whitaker for her assistance in mastering FAST, N. Bond, Y. Guo, and C. Leitherer for valuable discussions, and A. Fitzmaurice for her contributions to the earlier stages of this work. This material is based upon work supported by the National Aeronautics and Space Administration under Grant Number NNX13AT09H issued through the NASA Education Minority University Research Education Project (MUREP) through the NASA Harriett G. Jenkins Graduate Fellowship activity. D.F.d.M. was supported by STScI grant number HST-GO-12534.008-A. Facility: HST (WFC/ACS, WFC3/UVIS, WFC3/IR). Software: Source Extractor, IDL.

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Published - Soto_2017_ApJ_837_6.pdf

Submitted - 1702.03038.pdf

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Created:
August 22, 2023
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