system ( NGS2 ) at Gemini South will extend the guide stars accessible to GeMS by 2-2.5 magnitudes deeper than the current system . This new capability will allow us to extend the observations to massive galaxy clusters beyond redshift z ~ 1 in order to determine the main cause of galaxy growth in size since cosmic high noon .
This work is accepted for publication in Monthly Notices of the Royal Astronomical Society and is availabe at this site .
Sarah Sweet is a Postdoctoral Research Fellow at the Australian National University . She can be contacted at : sarah @ sarahsweet . com . au
Rodrigo Carrasco is an astronomer at Gemini South in Chile . He can be reached at : rcarrasco @ gemini . edu
Fernanda Urrutia is an outreach astronomer at Gemini South . She can be reached at : furrutia @ gemini . edu
Figure 3 . Stellar mass-size relation for the cluster SPT-CL J0546-5345 compared with other work in the literature . Top left : K s
-band stellar mass-size relation at z = 1 . The relation , defined by our cluster members , has a slope of β = 0.74 , consistent with , but offset by , 0.21 dex from the z = 0 relation shown as the dashed line . Both relations trace the underlying stellar population . Top right : stellar mass-size relation for the SPT cluster measured in GeMS / GSAOI K s
( red filled circles and black solid line ), HST ACS F814W ( rest-frame B-band shown as blue down triangles and dot-dashed line ), and F606W ( rest-frame U-band as magenta squares and dashed line ) bands . Bottom left : other z ~ 1 samples from the literature , measured in various rest-frame wavelengths . Rest-frame B-band measurements are shown in blue , and rest-frame V-band in green . Bottom right : the effect of resolution on the stellar mass-size relation . Filled red circles and solid line depict our GeMS / GSAOI K s
-band imaging ( FWHM ~ 110 milliarcseconds ). Blue down triangles and dot-dashed line show measurements from our imaging smoothed to the resolution of Gemini ’ s Near-Infrared Camera and Multi-Object Spectrometer ( 220 milliarcseconds ); magenta squares and dashed line are from smoothing to the resolution of the FourStar infrared camera ( 510 milliarcseconds ) at the Magellan Baade 6.5-meter telescope at Las Campañas Observatory in Chile . The horizontal dotted lines indicate the physical size at z = 1 , which corresponds to the resolution of each instrument .
6 GeminiFocus January 2017 | 2016 Year in Review