The Sizes of Candidate $z\sim 9-10$ Galaxies: confirmation of the bright CANDELS sample and relation with luminosity and mass

Abstract

Recently, a small sample of six $z\sim 9-10$ candidates was discovered in CANDELS that are $\sim 10-20\times$ more luminous than any of the previous $z\sim 9-10$ galaxies identified over the HUDF/XDF and CLASH fields. We measure the sizes of these candidates to map out the size evolution of galaxies from the earliest observable times. Their sizes are also used to provide a valuable constraint on whether these unusual galaxy candidates are at high redshift. Using galfit to derive sizes from the CANDELS F160W images of these candidates, we find a mean size of 0.13$\pm$0.02" (or 0.5$\pm$0.1 kpc at $z\sim 9-10$). This handsomely matches the 0.6 kpc size expected extrapolating lower redshift measurements to $z\sim 9-10$, while being much smaller than the 0.59" mean size for lower-redshift interlopers to $z\sim 9-10$ photometric selections lacking the blue IRAC color criterion. This suggests that source size may be an effective constraint on contaminants from $z\sim 9-10$ selections lacking IRAC data. Assuming on the basis of the strong photometric evidence that the Oesch et al. 2014 sample is entirely at $z\sim 9-10$, we can use this sample to extend current constraints on the size-luminosity, size-mass relation, and size evolution of galaxies to $z\sim 10$. We find that the $z\sim 9-10$ candidate galaxies have broadly similar sizes and luminosities as $z\sim 6$-8 counterparts with star-formation-rate surface densities in the range of ${\mathrm{\Sigma }}_{\mathrm{SFR}}=1-20{\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}\mathrm{kp}{\mathrm{c}}^{-2}$. The stellar mass-size relation is uncertain, but shallower than those inferred for lower-redshift galaxies. In combination with previous size measurements at z=4-7, we find a size evolution of $(1+z{)}^{-m}$ with $m=1.0\pm 0.1$ for $>0.3L_{z=3}^{\ast }$ galaxies, consistent with the evolution previously derived from $2<z<8$ galaxies.

9 figures, 5 tables, accepted by ApJ

References in corpus (13)

• Astropy: A Community Python Package for Astronomy
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Hubble Ultra Deep Field
• The Most Luminous z~9-10 Galaxy Candidates yet Found: The Luminosity Function, Cosmic Star-Formation Rate, and the First Mass Density Estimate at 500 Myr
• The HST eXtreme Deep Field XDF: Combining all ACS and WFC3/IR Data on the HUDF Region into the Deepest Field Ever
• Search for TeV Gamma-ray Emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S
• Scaling Relations of Spiral Galaxies
• The UDF05 Follow-up of the HUDF: II. Constraints on Reionization from z-dropout Galaxies
• Milky Way Red Dwarfs in the BoRG Survey; Galactic scale-height and the distribution of dwarfs stars in WFC3 imaging
• The galaxy luminosity - size relation and selection biases in the Hubble Ultra Deep Field
• Keck-I MOSFIRE spectroscopy of the z~12 candidate galaxy UDFj-39546284
• Galaxy size trends as a consequence of cosmology

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