The SAMI Galaxy Survey: cubism and covariance, putting round pegs into square holes ...

We present a methodology for the regularization and combination of sparse sampled and irregularly gridded observations from fibre-optic multiobject integral field spectroscopy. The approach minimizes interpolation and retains image resolution on combining subpixel dithered data. We discuss the metho...

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Bibliographic Details
Main Authors: Goodwin, M., Cecil, G. N., Foster, C., Obreschkow, D., Croom, S. M., Mould, J., Allen, J. T., Hopkins, A. M., Pracy, M. B., Barnes, L. A., Cortese, L., Drinkwater, M. J., Thomas, A. D., Liske, J., Lewis, G. F., Owers, M. S., Fogarty, L. M.R., Colless, M., Tonini, C., Parker, Q., Bland-Hawthorn, J., Lawrence, J. S., Konstantopoulos, I. S., Green, A. W., Lorente, N. P.F., Mahajan, S., Richards, S. N., Sharp, R., Walcher, C. J., Gunawardhana, M. L.P., McElroy, R., Brough, S., Schaefer, A. L., Ho, I. T., López-Sánchez, R., Bryant, J. J., Scott, N., Couch, W. J., Birchall, M., Driver, S., Leslie, S. K., Bloom, J. V., Sweet, S. M., Medling, A. M., Jones, H., Bauer, A. E., Nielsen, J., Taylor, E. N., Hampton, E. J.
Format: Text
Language:English
Published: The University of North Carolina at Chapel Hill University Libraries 2015
Subjects:
sami
Online Access:https://dx.doi.org/10.17615/fzcj-dr19
https://cdr.lib.unc.edu/concern/articles/xk81jv328
Description
Summary:We present a methodology for the regularization and combination of sparse sampled and irregularly gridded observations from fibre-optic multiobject integral field spectroscopy. The approach minimizes interpolation and retains image resolution on combining subpixel dithered data. We discuss the methodology in the context of the Sydney-AAO multiobject 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 1° 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 per cent degradation in the final image resolution recovered. We also implement a new methodology for tracking covariance between elements of the resulting data cubes which retains 90 per cent of the covariance ...

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