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http://hdl.handle.net/20.500.12386/26227
Titolo: | GeMS/GSAOI Photometric and Astrometric Performance in Dense Stellar Fields | Autori: | Dalessandro, Emanuele Saracino, S. ORIGLIA, Livia Marchetti, E. Ferraro, F. R. Lanzoni, B. Geisler, D. Cohen, R. E. Mauro, F. Villanova, S. |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 833 | Fascicolo: | 1 | Da pagina:: | 111 | Abstract: | Ground-based imagers at 8 m class telescopes assisted by multi-conjugate adaptive optics are primary facilities with which to obtain accurate photometry and proper motions in dense stellar fields. We observed the central region of the globular clusters Liller 1 and NGC 6624 with the Gemini Multi-conjugate Adaptive Optics System (GeMS) feeding the Gemini South Adaptive Optics Imager (GSAOI) currently available at the Gemini South telescope, under different observing conditions. We characterized the stellar point-spread function (PSF) in terms of FWHM, Strehl ratio (SR), and encircled energy (EE), over the field of view (FOV). We found that, for sub-arcsecond seeing at the observed airmass, we can obtain the diffraction-limited PSF (FWHM ≈ 80 mas), SR ∼ 40%, and EE ≥ 50% with a dispersion around 10% over the FOV of 85″ × 85″, in the K <SUB> s </SUB> band. In the J band the best images provide FWHMs between 60 and 80 mas, SR \gt 10 % , and {EE}\gt 40 % . For seeing at the observed airmass exceeding 1″, the performance worsens but it is still possible to perform PSF fitting photometry with 25% EE in J and 40% in K <SUB> s </SUB>. We also computed the geometric distortions of GeMS/GSAOI and we obtained corrected images with an astrometric accuracy of ∼1 mas in a stellar field with high crowding. | URI: | http://hdl.handle.net/20.500.12386/26227 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/833/1/111 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/833/1/111 | Bibcode ADS: | 2016ApJ...833..111D | Fulltext: | open |
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