Probing ∼L* Lyman-break galaxies at z≈ 7 in GOODS-South with WFC3 on Hubble Space Telescope
Wilkins, S.; Bunker, A.; Ellis, R.S.; Stark, D.; Stanway, E.R.; Chiu, K.; Lorenzoni, S.; Jarvis, M.J.
Citation: Wilkins , S , Bunker , A , Ellis , R S , Stark , D , Stanway , E R , Chiu , K , Lorenzoni , S & Jarvis , M J 2010 , ' Probing ∼L* Lyman-break galaxies at z≈ 7 in GOODS-South with WFC3 on Hubble Space Telescope ' Monthly Notices of the Royal Astronomical Society , vol 403 , no. 2 , pp. 938-944 . DOI: 10.1111/j.1365-2966.2009.16175.x
We analyse recently acquired near-infrared Hubble Space Telescope imaging of the Great Observatories Origins Deep Survey (GOODS)-South field to search for star-forming galaxies at z≈ 7.0 . By comparing Wide Field Camera 3 (WFC3) 0.98 μ m Y-band images with Advanced Camera for Surveys (ACS) z-band ( 0.85 μ m) images, we identify objects with colours consistent with Lyman-break galaxies at z≃ 6.4–7.4 . This new data cover an area five times larger than that previously reported in the WFC3 imaging of the Hubble Ultra Deep Field and affords a valuable constraint on the bright end of the luminosity function. Using additional imaging of the region in the ACS B, V and i bands from GOODS v2.0 and the WFC 3J band, we attempt to remove any low-redshift interlopers. Our selection criteria yields six candidates brighter than YAB= 27.0 , of which all except one are detected in the ACS z-band imaging and are thus unlikely to be transients. Assuming all six candidates are at z≈ 7, this implies a surface density of objects brighter than YAB= 27.0 of 0.30 ± 0.12 arcmin−2 , a value significantly smaller than the prediction from z≈ 6 luminosity function. This suggests continued evolution of the bright end of the luminosity function between z= 6 and 7, with number densities lower at higher redshift.
Original article can be found at: http://www3.interscience.wiley.com/ Copyright Royal Astronomical Society
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