English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present very deep Wide Field Camera 3 (WFC3) photometry of a massive,compact galaxy located in the Hubble Ultra Deep Field. This quiescent galaxyhas a spectroscopic redshift z=1.91 and has been identified as an extremelycompact galaxy by Daddi et al. 2005. We use new H-F160W imaging data obtainedwith Hubble Space Telescope/WFC3 to measure the deconvolved surface brightnessprofile to H = 28 mag arcsec**-2. We find that the surface brightness profileis well approximated by an n=3.7 Sersic profile. Our deconvolved profile isconstructed by a new technique which corrects the best-fit Sersic profile withthe residual of the fit to the observed image. This allows for galaxy profileswhich deviate from a Sersic profile. We determine the effective radius of thisgalaxy: r_e=0.42 +- 0.14 kpc in the observed H-F160W-band. We show that thisresult is robust to deviations from the Sersic model used in the fit. We testthe sensitivity of our analysis to faint "wings" in the profile using simulatedgalaxy images consisting of a bright compact component and a faint extendedcomponent. We find that due to the combination of the WFC3 imaging depth andour method's sensitivity to extended faint emission we can accurately trace theintrinsic surface brightness profile, and that we can therefore confidentlyrule out the existence of a faint extended envelope around the observed galaxydown to our surface brightness limit. These results confirm that the galaxylies a factor of 10 off from the local mass-size relation.

Confirmation of the compactness of a z=1.91 quiescent galaxy with Hubble Space Telescope's Wide Field Camera 3