Galaxies in the First Billion Years: Implications for Reionization and the Star Formation History at z>6

Details Galaxies in the First Billion Years: Implications for Reionization and the Star Formation History at z>6 Galaxies in the First Billion Years: Implications for Reionization and the Star Formation History at z>6

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...7e...7b&link_type=abstract

The Universe at z > 6, 26th meeting of the IAU, Joint Discussion 7, 17-18 August 2006, Prague, Czech Republic, JD07, #7

Physics

Scientific paper

We have discovered a population of star-forming galaxies at z~6 and beyond (within the first billion years) through the i-drop technique. The first application of this to HST/ACS imaging was presented in Stanway, Bunker & McMahon (2003 MNRAS 342, 439), using the public GOODS survey. We were able to prove this technique through Keck/DEIMOS spectroscopy (Bunker et al. 2003, MNRAS 342, L47). Using the same i-drop selection, our first analysis of the Hubble Deep Field revealed 50 star forming galaxies at redshifts around 6 with magnitudes z'(AB)>28.5 (Bunker, Stanway, Ellis & McMahon 2004, MNRAS 355, 374). Spitzer observations with IRAC enable us to estimate the stellar masses and luminosity-weighted ages for this population; we find in some cases that there are Balmer breaks, indicating ages of >200Myr and formation redshifts of z~10 (Eyles, Bunker, Stanway et al. 2005, MNRAS 364, 443). I will discuss the stellar mass density, and the implications for the previous star formation history and for reionization. Our work is the strongest constraint to date on the star formation history at z>6.

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