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The UV Continuum of z > 1 Star-forming Galaxies in the Hubble Ultraviolet Ultradeep Field

Kurczynski, Peter and Gawiser, Eric and Rafelski, Marc and Teplitz, Harry I. and Acquaviva, Viviana and Brown, Thomas M. and Coe, Dan and de Mello, Duilia F. and Finkelstein, Steven L. and Grogin, Norman A. and Koekemoer, Anton M. and Lee, Kyoung-Soo and Scarlata, Claudia and Siana, Brian D. (2014) The UV Continuum of z > 1 Star-forming Galaxies in the Hubble Ultraviolet Ultradeep Field. Astrophysical Journal Letters, 793 (1). Art. No. L5. ISSN 2041-8205.

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We estimate the UV continuum slope, β, for 923 galaxies in the range 1 < z < 8 in the Hubble Ultradeep Field (HUDF). These data include 460 galaxies at 1 < z < 2 down to an absolute magnitude M_UV= -14(~0.006, L^(*)(_z=1); 0.02 L^*_{z=0), comparable to dwarf galaxies in the local universe. We combine deep HST/UVIS photometry in F225W, F275W, F336W wavebands (UVUDF) with recent data from HST/WFC3/IR (HUDF12). Galaxies in the range 1 < z < 2 are significantly bluer than local dwarf galaxies. We find their mean (median) values <β> = – 1.382(– 1.830) ± 0.002 (random) ± 0.1 (systematic). We find comparable scatter in β (standard deviation = 0.43) to local dwarf galaxies and 30% larger scatter than z > 2 galaxies. We study the trends of β with redshift and absolute magnitude for binned sub-samples and find a modest color-magnitude relation, dβ/dM = –0.11 ± 0.01, and no evolution in dβ/dM with redshift. A modest increase in dust reddening with redshift and luminosity, ΔE(B – V) ~ 0.1, and a comparable increase in the dispersion of dust reddening at z < 2, appears likely to explain the observed trends. At z > 2, we find trends that are consistent with previous works; combining our data with the literature in the range 1 < z < 8, we find a color evolution with redshift, dβ/dz = –0.09 ± 0.01 for low luminosity (0.05 L^(*)_(z=3), and dβ/dz = –0.06 ± 0.01 for medium luminosity (0.25 $L^(*)_(z=3) galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Rafelski, Marc0000-0002-9946-4731
Teplitz, Harry I.0000-0002-7064-5424
Acquaviva, Viviana0000-0002-6788-6315
Brown, Thomas M.0000-0002-1793-9968
Coe, Dan0000-0001-7410-7669
Koekemoer, Anton M.0000-0002-6610-2048
Scarlata, Claudia0000-0002-9136-8876
Siana, Brian D.0000-0002-4935-9511
Additional Information:© 2014 American Astronomical Society. Received 2014 March 31; accepted 2014 July 25; published 2014 September 2. The authors wish to thank the anonymous referee for comments that greatly improved this manuscript. Support for HST Program GO-12534was provided byNASAthrough grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-2655. This material is based upon work supported by the National Science Foundation under grant no. 1055919.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Space Telescope Science InstituteUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:cosmology: observations; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: structure
Issue or Number:1
Record Number:CaltechAUTHORS:20141002-133739716
Persistent URL:
Official Citation:The UV Continuum of z > 1 Star-forming Galaxies in the Hubble Ultraviolet UltraDeep Field Peter Kurczynski et al. 2014 ApJ 793 L5
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50177
Deposited By: Jason Perez
Deposited On:06 Oct 2014 02:11
Last Modified:03 Oct 2019 07:21

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