The SAMI Galaxy Survey: cubism and covariance, putting round pegs into square holes
Autor: | Quentin A. Parker, Nicholas Scott, Michael Pracy, Elise Hampton, Nuria P. F. Lorente, Geraint F. Lewis, Warrick J. Couch, Smriti Mahajan, Amanda E. Bauer, C. J. Walcher, Andrew W. Green, Jon Nielsen, Samuel N. Richards, Jochen Liske, Sarah M. Sweet, Rebecca McElroy, James T. Allen, Scott M. Croom, Michael N. Birchall, Gerald Cecil, Angel R. Lopez-Sanchez, Adam L. Schaefer, H. Jones, I-Ting Ho, A. D. Thomas, Michael J. Drinkwater, Sarah Brough, Jeremy Mould, Matt S. Owers, Luca Cortese, Julia J. Bryant, J. S. Lawrence, C. Tonini, Iraklis S. Konstantopoulos, Danail Obreschkow, L. M. R. Fogarty, Michael Goodwin, Rob Sharp, Matthew Colless, Edward N. Taylor, Luke A. Barnes, Caroline Foster, Madusha Gunawardhana, Simon P. Driver, J. V. Bloom, Sarah K. Leslie, Andrew M. Hopkins, Anne M. Medling, Jonathan Bland-Hawthorn |
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Přispěvatelé: | University of St Andrews. School of Physics and Astronomy |
Rok vydání: | 2014 |
Předmět: |
FOS: Physical sciences
Field of view Astrophysics::Cosmology and Extragalactic Astrophysics Data cube Integral field spectrograph QB Astronomy spectrographs [Instrumentation] data analysis [Methods] Instrumentation and Methods for Astrophysics (astro-ph.IM) Image resolution QC Astrophysics::Galaxy Astrophysics QB Physics imaging spectroscopy [Techniques] Astrophysics::Instrumentation and Methods for Astrophysics Astronomy DAS Astronomy and Astrophysics Covariance Redshift survey Astrophysics - Astrophysics of Galaxies Subpixel rendering Galaxy QC Physics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics - Instrumentation and Methods for Astrophysics Algorithm |
Zdroj: | Monthly Notices of the Royal Astronomical Society. 446:1551-1566 |
ISSN: | 1365-2966 0035-8711 |
Popis: | We present a methodology for the regularisation and combination of sparse sampled and irregularly gridded observations from fibre-optic multi-object integral-field spectroscopy. The approach minimises interpolation and retains image resolution on combining sub-pixel dithered data. We discuss the methodology in the context of the Sydney-AAO Multi-object Integral-field spectrograph (SAMI) Galaxy Survey underway at the Anglo-Australian Telescope. The SAMI instrument uses 13 fibre bundles to perform high-multiplex integral-field spectroscopy across a one degree diameter field of view. The SAMI Galaxy Survey is targeting 3000 galaxies drawn from the full range of galaxy environments. We demonstrate the subcritical sampling of the seeing and incomplete fill factor for the integral-field bundles results in only a 10% degradation in the final image resolution recovered. We also implement a new methodology for tracking covariance between elements of the resulting datacubes which retains 90% of the covariance information while incurring only a modest increase in the survey data volume. Comment: 17 pages, 10 figures, Accepted MNRAS September 2014 |
Databáze: | OpenAIRE |
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