2012ApJ...749...88H -
Astrophys. J., 749, 88 (2012/April-2)
The taiwan ECDFS near-infrared survey: very bright end of the luminosity function at z > 7.
HSIEH B.-C., WANG W.-H., YAN H., LIN L., KAROJI H., LIM J., HO P.T.P. and TSAI C.-W.
Abstract (from CDS):
The primary goal of the Taiwan ECDFS Near-Infrared Survey (TENIS) is to find well-screened galaxy candidates at z > 7 (z' dropout) in the Extended Chandra Deep Field-South (ECDFS). To this end, TENIS provides relatively deep J and Ks data (∼25.3 ABmag, 5σ) for an area of 0.5x0.5 deg. Leveraged with existing data at mid-infrared to optical wavelengths, this allows us to screen for the most luminous high-z objects, which are rare and thus require a survey over a large field to be found. We introduce new color selection criteria to select a z > 7 sample with minimal contaminations from low-z galaxies and Galactic cool stars; to reduce confusion in the relatively low angular resolution Infrared Array Camera (IRAC) images, we introduce a novel deconvolution method to measure the IRAC fluxes of individual sources. Illustrating perhaps the effectiveness at which we screen out interlopers, we find only one z > 7 candidate, TENIS-ZD1. The candidate has a weighted zphot of 7.8, and its colors and luminosity indicate a young (45M years old) starburst galaxy with a stellar mass of 3.2x1010 M☉. The result matches with the observational luminosity function analysis and the semianalytic simulation result based on the Millennium Simulations, which may over predict the volume density for high-z massive galaxies. The existence of TENIS-ZD1, if confirmed spectroscopically to be at z > 7, therefore poses a challenge to current theoretical models for how so much mass can accumulate in a galaxy at such a high redshift.
Abstract Copyright:
∼
Journal keyword(s):
galaxies: evolution - galaxies: formation - galaxies: high-redshift
Simbad objects:
3
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2012ApJ...749...88H and select 'bookmark this link' or equivalent in the popup menu