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dc.creatorFinkelstein, Steven L.en_US
dc.creatorPapovich, Caseyen_US
dc.creatorSalmon, Bretten_US
dc.creatorFinlator, Kristianen_US
dc.creatorDickinson, Marken_US
dc.creatorFerguson, Henry C.en_US
dc.creatorGiavalisco, Mauroen_US
dc.creatorKoekemoer, Anton M.en_US
dc.creatorReddy, Naveen A.en_US
dc.creatorBassett, Roberten_US
dc.creatorConselice, Christopher J.en_US
dc.creatorDunlop, James S.en_US
dc.creatorFaber, S. M.en_US
dc.creatorGrogin, Norman A.en_US
dc.creatorHathi, Nimish P.en_US
dc.creatorKocevski, Dale D.en_US
dc.creatorLai, Kamsonen_US
dc.creatorLee, Kyoung-Sooen_US
dc.creatorMcLure, Ross J.en_US
dc.creatorMobasher, Bahramen_US
dc.creatorNewman, Jeffrey A.en_US
dc.date.accessioned2016-04-28T19:42:55Z
dc.date.available2016-04-28T19:42:55Z
dc.date.issued2012-09en
dc.identifierdoi:10.15781/T2X24N
dc.identifier.citationFinkelstein, Steven L., Casey Papovich, Brett Salmon, Kristian Finlator, Mark Dickinson, Henry C. Ferguson, Mauro Giavalisco et al. "CANDELS: The evolution of galaxy rest-frame ultraviolet colors from z= 8 to 4." The Astrophysical Journal, Vol. 756, No. 2 (Oct., 2012): 164.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35160
dc.description.abstractWe study the evolution of galaxy rest-frame ultraviolet (UV) colors in the epoch 4 less than or similar to z less than or similar to 8. We use new wide-field near-infrared data in the Great Observatories Origins Deep Survey-South field from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey, Hubble Ultra Deep Field (HUDF) 2009, and Early Release Science programs to select galaxies via photometric redshift measurements. Our sample consists of 2812 candidate galaxies at z greater than or similar to 3.5, including 113 at z similar or equal to 7-8. We fit the observed spectral energy distribution to a suite of synthetic stellar population models and measure the value of the UV spectral slope (beta) from the best-fit model spectrum. We run simulations to show that this measurement technique results in a smaller scatter on beta than other methods, as well as a reduced number of galaxies with catastrophically incorrect beta measurements (i.e.,. Delta beta > 1). We find that the median value of beta evolves significantly from -1.82(-0.04)(+0.00) at z = 4 to -2.37(-0.06)(+0.26) at z = 7. Additionally, we find that faint galaxies at z = 7 have beta = -2.68(-0.24)(+0.39) (similar to-2.4 after correcting for observational bias); this is redder than previous claims in the literature and does not require "exotic" stellar populations (e. g., very low metallicities or top-heavy initial mass functions) to explain their colors. This evolution can be explained by an increase in dust extinction, from low amounts at z = 7 to A(V) similar to 0.5 mag at z = 4. The timescale for this increase is consistent with low-mass asymptotic giant branch stars forming the bulk of the dust. We find no significant (<2 sigma) correlation between beta and M-UV when measuring M-UV at a consistent rest-frame wavelength of 1500 angstrom. This is particularly true at bright magnitudes, though our results do show evidence for a weak correlation at faint magnitudes when galaxies in the HUDF are considered separately, hinting that dynamic range in sample luminosities may play a role. We do find a strong correlation between beta and the stellar mass at all redshifts, in that more massive galaxies exhibit redder colors. The most massive galaxies in our sample have similarly red colors at each redshift, implying that dust can build up quickly in massive galaxies and that feedback is likely removing dust from low-mass galaxies at z >= 7. Thus, the stellar-mass-metallicity relation, previously observed up to z similar to 3, may extend out to z = 7-8.en_US
dc.description.sponsorshipNASA through HST Cycle 18 HST-AR-12127en_US
dc.description.sponsorshipNASA through Hubble Fellowship HST-HF-51288.01en_US
dc.description.sponsorshipHST 12060, 12127en_US
dc.description.sponsorshipSpace Telescope Science Instituteen_US
dc.description.sponsorshipNASA NAS 5-26555en_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectearly universeen_US
dc.subjectgalaxies: evolutionen_US
dc.subjectgalaxies: formationen_US
dc.subjectgalaxies:en_US
dc.subjecthigh-redshiften_US
dc.subjectultraviolet: galaxiesen_US
dc.subjectlyman-break galaxiesen_US
dc.subjectstar-forming galaxiesen_US
dc.subjectultra-deep-fielden_US
dc.subjectsimilar-to 7en_US
dc.subjecthigh-redshift galaxiesen_US
dc.subjectearly release scienceen_US
dc.subjectextragalactic legacy surveyen_US
dc.subjectstarburst intensity limiten_US
dc.subjectmass-metallicityen_US
dc.subjectrelationen_US
dc.subjectformation rate densityen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleCANDELS: The Evolution Of Galaxy Rest-Frame Ultraviolet Colors From Z=8 To 4en_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2012_09_candels.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/756/2/164en_US
dc.contributor.utaustinauthorFinkelstein, Steven L.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


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