Structure and Morphologies of z~7-8 Galaxies from ultra-deep WFC3/IR Imaging of the HUDF

Details Structure and Morphologies of z~7-8 Galaxies from ultra-deep WFC3/IR Imaging of the HUDF Structure and Morphologies of z~7-8 Galaxies from ultra-deep WFC3/IR Imaging of the HUDF

2009-09-29

arxiv.org/abs/0909.5183v3

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 5 figures, ApJL accepted; small changes to match accepted version

Scientific paper

We present a first morphological study of z~7-8 Lyman Break galaxies (LBGs) from Oesch et al. 2009 and Bouwens et al. 2009 detected in ultra-deep near-infrared imaging of the Hubble Ultra Deep field (HUDF) by the HUDF09 program. With an average intrinsic size of 0.7+-0.3 kpc these galaxies are found to be extremely compact having an average observed surface brightness of mu_J ~= 26 mag arcsec^(-2), and only two out of the full sample of 16 z~7 galaxies show extended features with resolved double cores. By comparison to lower redshift LBGs it is found that only little size evolution takes place from z~7 to z~6, while galaxies between z~4-5 show more extended wings in their apparent profiles. The average size scales as (1+z)^(-m) with m=1.12+-0.17 for galaxies with luminosities in the range (0.3-1)L*_{z=3} and with m=1.32+-0.52 for (0.12-0.3)L*_{z=3}, consistent with galaxies having constant comoving sizes. The peak of the size distribution changes only slowly from z~7 to z~4. However, a tail of larger galaxies (>~ 1.2 kpc) is gradually built up towards later cosmic times, possibly via hierarchical build-up or via enhanced accretion of cold gas. Additionally, the average star-formation surface density of LBGs with luminosities (0.3-1)L*_{z=3} is nearly constant at Sigma_{SFR}=1.9 Msun/yr/kpc^2 over the entire redshift range z~4-7 suggesting similar star-formation efficiencies at these early epochs. The above evolutionary trends seem to hold out to z~8 though the sample is still small and possibly incomplete.

Affiliated with

Also associated with

No associations

Rating

Structure and Morphologies of z~7-8 Galaxies from ultra-deep WFC3/IR Imaging of the HUDF does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Structure and Morphologies of z~7-8 Galaxies from ultra-deep WFC3/IR Imaging of the HUDF, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure and Morphologies of z~7-8 Galaxies from ultra-deep WFC3/IR Imaging of the HUDF will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-663924