Nagy, Sarah R. and Law, David R. and Shapley, Alice E. and Steidel, Charles C. (2011) The Mass–Radius Relation for Star-forming Galaxies at z ~ 1.5-3.0. Astrophysical Journal Letters, 735 (1). Art. No. L19. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110816-082413937
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We present early results from a Hubble Space Telescope WFC3/IR imaging survey of star-forming galaxies in the redshift range 1.5 < z < 3.0. When complete, this survey will consist of 42 orbits of F160W imaging distributed amongst 10 survey fields on the line of sight to bright background QSOs, covering 65 arcmin^2 to a depth of 27.9 AB with a point-spread function FWHM of 0".18. In this contribution, we use a subset of these fields to explore the evolution of the galactic stellar mass-radius relation for a magnitude-limited sample of 102 spectroscopically confirmed star-forming galaxies ((SFR) ~ 30 M_☉ yr^(–1)) with stellar mass M_* ~ 10^(10) M_☉. Although the light profile of these galaxies often has an irregular, multi-component morphology, it is typically possible to describe the brightest component with a Sersic profile of index n ~ 1. The circularized half-light radius r e of the brightest component is on average r_e = 1.66 ± 0.79 kpc (i.e., ~50%-70% the size of local late-type galaxies with similar stellar mass), consistent with recent theoretical models that incorporate strong feedback from star-forming regions. The mean half-light radius increases with stellar mass and, at fixed stellar mass, evolves with cosmic time as ~(1 + z)^(–1.42), suggesting that high-redshift star-forming galaxies may evolve onto the local stellar mass-radius relation by redshift z ~ 1.
|Additional Information:||© 2011 The American Astronomical Society. Received 2011 March 25; accepted 2011 May 16; published 2011 June 9. S.R.N., D.R.L., and C.C.S. have been supported by grant GO-11694 from the Space Telescope Science Institute. Support for D.R.L. was also provided by NASA through Hubble Fellowship grant no. HF-51244.01 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. A.E.S. acknowledges support from the David and Lucile Packard Foundation.|
|Subject Keywords:||galaxies: fundamental parameters; galaxies: high-redshift; galaxies: structure|
|Classification Code:||PACS: 98.62.Ai; 98.62.Lv; 98.62.Ck; 98.62.Py|
|Official Citation:||The Mass–Radius Relation for Star-forming Galaxies at z ~ 1.5-3.0 Sarah R. Nagy et al. 2011 ApJ 735 L19|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||16 Aug 2011 17:03|
|Last Modified:||26 Dec 2012 13:28|
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