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A CANDELS-3d-HST Synergy: Resolved Star Formation Patterns at 0.7 less than z less than 1.5We analyze the resolved stellar populations of 473 massive star-forming galaxies at 0.7 < z < 1.5, with multiwavelength broadband imaging from CANDELS andHalpha surface brightness profiles at the same kiloparsec resolution from 3D-HST. Together, this unique data set sheds light on how the assembled stellar mass is distributed within galaxies, and where new stars are being formed. We find the Halpha morphologies to resemble more closely those observed in the ACS I band than in the WFC3 H band, especially for the larger systems. We next derive a novel prescription for Halpha dust corrections, which accounts for extra extinction toward H II regions. The prescription leads to consistent star formation rate (SFR) estimates and reproduces the observed relation between the Halpha/UV luminosity ratio and visual extinction, on both a pixel-by-pixel and a galaxy-integrated level. We find the surface density of star formation to correlate with the surface density of assembled stellar mass for spatially resolved regions within galaxies, akin to the so-called "main sequence of star formation" established on a galaxy-integrated level. Deviations from this relation toward lower equivalent widths are found in the inner regions of galaxies. Clumps and spiral features, on the other hand, are associated with enhanced H alpha equivalent widths, bluer colors, and higher specific SFRs compared to the underlying disk. Their Halpha/UV luminosity ratio is lower than that of the underlying disk, suggesting that the ACS clump selection preferentially picks up those regions of elevated star formation activity that are the least obscured by dust. Our analysis emphasizes that monochromatic studies of galaxy structure can be severely limited by mass-to-light ratio variations due to dust and spatially inhomogeneous star formation histories.
Document ID
20140008680
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1088/0004-637X/779/2/135
Authors
Wuyts, Stijn (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Foerster Schreiber, Natascha M. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Nelson, Erica J. (Yale Univ. New Haven, CT, United States)
Van Dokkum, Pieter G. (Yale Univ. New Haven, CT, United States)
Brammer, Gabe (European Southern Observatory Santiago, Chile)
Chang, Yu-Yen (Max-Planck-Inst. fuer Astronomie Heidelberg, Germany)
Faber, Sandra M. (California Univ. Santa Cruz, CA, United States)
Ferguson, Henry C. (Space Telescope Science Inst. Baltimore, MD, United States)
Franx, Marijn (Leiden Univ. Netherlands)
Fumagalli, Mattia (Leiden Univ. Netherlands)
Genzel, Reinhard (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Grogin, Norman A. (Space Telescope Science Inst. Baltimore, MD, United States)
Kocevski, Dale D. (Kentucky Univ. Lexington, KY, United States)
Koekemoer, Anton M. (Space Telescope Science Inst. Baltimore, MD, United States)
Lundgren, Britt (Wisconsin-Madison Univ. Madison, WI, United States)
Lutz, Dieter (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
McGrath, Elizabeth J. (Colby Coll. Waterville, ME, United States)
Momcheva, Ivelina (Yale Univ. New Haven, CT, United States)
Rosario, David (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Skelton, Rosalind E. (South African Astronomical Observatory Cape Town, South Africa)
Tacconi, Linda J. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Van der Wel, Arjen (Max-Planck-Inst. fuer Astronomie Heidelberg, Germany)
Whitaker, Katherine E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
July 2, 2014
Publication Date
December 20, 2013
Publication Information
Publication: The Astrophysical Journal
Publisher: The Astrophysical Journal
Volume: 779
Issue: 2
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN14729
Funding Number(s)
CONTRACT_GRANT: NAS5-26555
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
SYNERGY
RESOLVED
CANDELS-3D-HST

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