Evolution in the continuum morphological properties of Lyα-emitting galaxies from z = 3.1 to z = 2.1

Nicholas A. Bond, Eric Gawiser, Lucia Guaita, Nelson Padilla, Caryl Gronwall, Robin Ciardullo, Kamson Lai

Research output: Contribution to journalArticle

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Abstract

We present a rest-frame ultraviolet morphological analysis of 108 z ≃ 2.1 Lyα emitters (LAEs) in the Extended Chandra Deep Field South and compare it to a similar sample of 171 LAEs at z ≃ 3.1. Using Hubble Space Telescope images from the Galaxy Evolution from Morphology and SEDs survey, Great Observatories Origins Deep Survey, and Hubble Ultradeep Field, we measure size and photometric component distributions, where photometric components are defined as distinct clumps of UV-continuum emission. At both redshifts, >80% of LAEs have observed half-light radii <2kpc, but the median half-light radius rises from 0.95 ± 0.04kpc at z = 3.1 to 1.41 ± 0.14kpc at z = 2.1. A similar evolution is seen in the sizes of individual rest-UV components, but there is no evidence for evolution in the number of multi-component systems. In the z = 2.1 sample, we see clear correlations between the size of an LAE and other physical properties derived from its spectral energy distribution (SED). LAEs are found to be larger for galaxies with higher stellar mass, star formation rate, and dust obscuration, but there is no evidence for a trend between equivalent width and half-light radius at either redshift. The presence of these correlations suggests that a wide range of objects are being selected by LAE surveys at z 2, including a significant fraction of objects for which a massive and moderately extended population of old stars underlies the young starburst giving rise to the Lyα emission.

Original languageEnglish (US)
Article number95
JournalAstrophysical Journal
Volume753
Issue number2
DOIs
StatePublished - Jul 10 2012

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galaxies
continuums
radii
occultation
clumps
star formation rate
observatory
spectral energy distribution
physical property
stellar mass
Hubble Space Telescope
dust
observatories
emitters
physical properties
trends
stars
energy
distribution
rate

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bond, Nicholas A. ; Gawiser, Eric ; Guaita, Lucia ; Padilla, Nelson ; Gronwall, Caryl ; Ciardullo, Robin ; Lai, Kamson. / Evolution in the continuum morphological properties of Lyα-emitting galaxies from z = 3.1 to z = 2.1. In: Astrophysical Journal. 2012 ; Vol. 753, No. 2.
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Evolution in the continuum morphological properties of Lyα-emitting galaxies from z = 3.1 to z = 2.1. / Bond, Nicholas A.; Gawiser, Eric; Guaita, Lucia; Padilla, Nelson; Gronwall, Caryl; Ciardullo, Robin; Lai, Kamson.

In: Astrophysical Journal, Vol. 753, No. 2, 95, 10.07.2012.

Research output: Contribution to journalArticle

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