TY - JOUR
T1 - First performance of the GeMS + GMOS system - 1. Imaging
AU - Hibon, Pascale
AU - Garrel, Vincent
AU - Neichel, Benoit
AU - Prout, Benjamin
AU - Rigaut, Francois
AU - Koning, Alice
AU - Carrasco, Eleazar R.
AU - Gimeno, German
AU - Pessev, Peter
N1 - Publisher Copyright:
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2016/9/1
Y1 - 2016/9/1
N2 - During the commissioning of the Gemini MCAO System (GeMS), we had the opportunity to obtain data with the Gemini Multi-Object Spectrograph (GMOS), the most utilized instrument at Gemini South Observatory, in 2012 March and May. Several globular clusters were observed in imaging mode that allowed us to study the performance of this new and untested combination. GMOS is a visible instrument, hence pushing MCAO towards the visible. We report here on the results with the GMOS instruments, derive photometric performance in term of full width at half-maximum (FWHM) and throughput. In most of the cases, we obtained an improvement factor of at least 2 against the natural seeing. This result also depends on the natural guide star constellation selected for the observations and we then study the impact of the guide star selection on the FWHM performance. We also derive a first astrometric analysis showing that the GeMS+GMOS system provide an absolute astrometric precision better than 8 mas and a relative astrometric precision lower than 50 mas.
AB - During the commissioning of the Gemini MCAO System (GeMS), we had the opportunity to obtain data with the Gemini Multi-Object Spectrograph (GMOS), the most utilized instrument at Gemini South Observatory, in 2012 March and May. Several globular clusters were observed in imaging mode that allowed us to study the performance of this new and untested combination. GMOS is a visible instrument, hence pushing MCAO towards the visible. We report here on the results with the GMOS instruments, derive photometric performance in term of full width at half-maximum (FWHM) and throughput. In most of the cases, we obtained an improvement factor of at least 2 against the natural seeing. This result also depends on the natural guide star constellation selected for the observations and we then study the impact of the guide star selection on the FWHM performance. We also derive a first astrometric analysis showing that the GeMS+GMOS system provide an absolute astrometric precision better than 8 mas and a relative astrometric precision lower than 50 mas.
KW - Astrometry
KW - Globular clusters: general
KW - Instrumentation: adaptive optics
KW - Methods: observational
UR - http://www.scopus.com/inward/record.url?scp=84988842001&partnerID=8YFLogxK
U2 - 10.1093/mnras/stw715
DO - 10.1093/mnras/stw715
M3 - Article
SN - 0035-8711
VL - 461
SP - 507
EP - 518
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -