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Point-spread function reconstruction for integral-field spectrograph data
Author(s): Tuan Do; Anna Ciurlo; Gunther Witzel; Jessica Lu; Paolo Turri; Michael Fitzgerald; Randy Campbell; Jim Lyke; Andrea Ghez
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Paper Abstract

Knowledge of the point spread function (PSF) is critical to many astronomical science cases. However, the PSF can be very difficult to estimate for cases where there are many crowded point sources or for observations of extended objects. Additionally, for adaptive optics observations, the PSF can be very complex with both spatial and temporal variability in the PSF. Integral-field spectroscopy behind adaptive optics is especially challenging because the fields of view are typically too small to sample the halo for even a single PSF. Here, we present a method for semi-empirical PSF reconstruction for integral field spectrographs using a combination of point source observations on a parallel imager, instrumental aberration measurements, and atmospheric turbulence profiles. This work builds upon the PSF reconstruction project AIROPA designed for imaging and extending it to IFU work (AIROPA-IFU). By using empirical calibrators from the parallel imager, which has a much larger field of view, and accounting for anisoplantic effects and instrumental aberrations, we can predict the PSF on the spectrograph. An important aspect is being able to predict the PSF at many different wavelengths based on observations from broad-band imaging. Here, we discuss how science cases such as observations of stars at the Galactic center can benefit from this method. We also establish metrics to quantitatively assess the performance of PSF reconstruction. We show that for bright stars, AIROPA-IFU can produce spectra with signal to noise ratio 50% higher than with simple aperture extraction of a data cube.

Paper Details

Date Published: 10 July 2018
PDF: 9 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107030I (10 July 2018); doi: 10.1117/12.2314216
Show Author Affiliations
Tuan Do, Univ. of California, Los Angeles (United States)
Anna Ciurlo, Univ. of California, Los Angeles (United States)
Gunther Witzel, Univ. of California, Los Angeles (United States)
Jessica Lu, Univ. of California, Berkeley (United States)
Paolo Turri, Univ. of California, Berkeley (United States)
Michael Fitzgerald, Univ. of California, Los Angeles (United States)
Randy Campbell, W. M. Keck Observatory (United States)
Jim Lyke, W. M. Keck Observatory (United States)
Andrea Ghez, Univ. of California, Los Angeles (United States)

Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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