Spitzer/IRAC Confirmation of z850-dropout Galaxies in the Hubble Ultra Deep Field: Stellar Masses and Ages at z 7

Details Spitzer/IRAC Confirmation of z850-dropout Galaxies in the Hubble Ultra Deep Field: Stellar Masses and Ages at z 7 Spitzer/IRAC Confirmation of z850-dropout Galaxies in the Hubble Ultra Deep Field: Stellar Masses and Ages at z 7

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20913202l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #132.02; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Using ultradeep Spitzer IRAC imaging from GOODS we study the mid-infrared properties of z850-dropout candidates in the Hubble Ultra Deep Field. We clearly detect two sources at 3.6micron and 4.5micron, with rest-frame optical-infrared colors strongly suggesting they are galaxies at z 7. Fitting stellar populations to the SEDs, we find rest-frame colors U-V = 0.2-0.4 (AB), V-band luminosities 0.6-3 x 1010Lsun, stellar masses 1-10 x 109 Msun, and ages 50--200 Myr. I will discuss their star formation history, the stellar mass density at z=7, and implications for reionization.

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