Photometric and Astrometric Analysis of Gemini/Hokupa’a Galactic Center Adaptive Optics Observations
We have compared three techniques—StarFinder, IDAC (Iterative Deconvolution Algorithm in C), and parametric blind deconvolution (PBD)—for extracting photometry and astrometry of stars in densely crowded field adaptive optics observations, and their point‐spread functions (PSFs). The three algorithms...
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| Veröffentlicht in: | Publications of the Astronomical Society of the Pacific 2004-08, Vol.116 (822), p.734-744 |
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| container_title | Publications of the Astronomical Society of the Pacific |
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| creator | Christou, Julian C. Pugliese, Giovanna Köhler, Rainer Drummond, Jack D. |
| description | We have compared three techniques—StarFinder, IDAC (Iterative Deconvolution Algorithm in C), and parametric blind deconvolution (PBD)—for extracting photometry and astrometry of stars in densely crowded field adaptive optics observations, and their point‐spread functions (PSFs). The three algorithms investigated produce very similar results over dynamic ranges of 4 mag, accurately measuring relative photometry to within 0.1 mag for dynamic ranges of 5 mag, as well as astrometry to within 10% of the PSF width. At larger dynamic ranges, the photometry is more dependent upon the field crowding, the signal‐to‐noise ratio, and the algorithm used. |
| doi_str_mv | 10.1086/423433 |
| format | Article |
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The three algorithms investigated produce very similar results over dynamic ranges of 4 mag, accurately measuring relative photometry to within 0.1 mag for dynamic ranges of 5 mag, as well as astrometry to within 10% of the PSF width. At larger dynamic ranges, the photometry is more dependent upon the field crowding, the signal‐to‐noise ratio, and the algorithm used.</description><identifier>ISSN: 0004-6280</identifier><identifier>EISSN: 1538-3873</identifier><identifier>DOI: 10.1086/423433</identifier><identifier>CODEN: PASPAU</identifier><language>eng</language><publisher>Chicago, IL: The University of Chicago Press</publisher><subject>Adaptive optics ; Astrometry ; Astronomical magnitude ; Astronomical objects ; Astronomical photometry ; Astronomy ; Dynamic range ; Earth, ocean, space ; Exact sciences and technology ; Fundamental astronomy and astrophysics. 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The three algorithms investigated produce very similar results over dynamic ranges of 4 mag, accurately measuring relative photometry to within 0.1 mag for dynamic ranges of 5 mag, as well as astrometry to within 10% of the PSF width. At larger dynamic ranges, the photometry is more dependent upon the field crowding, the signal‐to‐noise ratio, and the algorithm used.</description><subject>Adaptive optics</subject><subject>Astrometry</subject><subject>Astronomical magnitude</subject><subject>Astronomical objects</subject><subject>Astronomical photometry</subject><subject>Astronomy</subject><subject>Dynamic range</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations</subject><subject>Galactic Center</subject><subject>Image processing (including source extraction)</subject><subject>Observation and data reduction techniques. 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| subjects | Adaptive optics Astrometry Astronomical magnitude Astronomical objects Astronomical photometry Astronomy Dynamic range Earth, ocean, space Exact sciences and technology Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations Galactic Center Image processing (including source extraction) Observation and data reduction techniques. Computer modeling and simulation Pixels Point sources Stars |
| title | Photometric and Astrometric Analysis of Gemini/Hokupa’a Galactic Center Adaptive Optics Observations |
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