Early Results from the HexPak and GradPak Variable-Scale Dual-Head IFUs on the WIYN 3.5-meter Telescope

Type Conference Paper
Names Eric Hooper, Matthew A. Bershady, Arthur Eigenbrot, Corey M. Wood, Scott Buckley, Michael Smith, Charles Corson, Marsha J. Wolf, Guanying Y. Zhu, Andrea Vang, John S. Gallagher, Andrew Sheinis, Washburn Astronomical Laboratories
Conference Name American Astronomical Society Meeting Abstracts
Volume 225
Date January 1, 2015
URL http://adsabs.org/2015AAS.22533716H
Library Catalog adslabs.org
Abstract The WIYN Observatory recently installed two new integral field units (IFUs) on its 3.5-meter telescope on Kitt Peak, Arizona. Each IFU is unique in that it contains different sized fibers in the same head to optimize the tradeoff between spatial resolution and surface brightness sensitivity for observations of galaxies. These instruments were designed and constructed (M. Bershady, PI) at the University of Wisconsin's Washburn Astronomical Laboratory. HexPak, with a central core of 1 arcsec fibers surrounded by a halo of 3 arcsec fibers, was designed for early type, face-on disk, and quasar host galaxies. GradPak, with a series of rows of fibers of increasing diameter from 2 arcsec to 6 arcsec (5 different diameters total), was designed for edge-on galaxies, where the small fibers lie along the midplane and larger fibers sample the progressively lower surface brightnesses above the plane. The instruments were installed alongside the existing SparsePak IFU in late 2013 and have been used in several observing runs since. The different fiber sizes present additional data reduction challenges, particularly regarding flux calibration and sky subtraction. Early results on studies of the stellar populations of galaxies are quite promising and demonstrate the advantages of fiber sizes tailored to the objects under study. HexPak and GradPak were built with funds from NSF award ATI-0804576.
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