The Extreme Red: Characterizing LSST's Y3 and Y4 Filters

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

One of the essential science requirements of the Large Synoptic Survey Telescope lies in its high standard for photometric precision for both photometry and photometric redshift calculation. To capture rest-frame optical spectral features in high-redshift sources, the survey will use a variant of the Y band, which encompasses the reddest hundred nanometers before the Silicon response function cut-off. However, a significant data calibration challenge presents itself with this region of wavelength space: a strongly varying water absorption feature is present directly in the midst of it. In light of this, the survey has proposed two versions of the Y filter, a broad Y4 that includes the water band and a narrower Y3 that excludes it.
In an effort to determine whether the wider filter is characterizable, we undertook an observing campaign with a 4k x 4k ccd camera on the 1.2m Calypso telescope on Kitt Peak to directly compare the properties of the two filters. We present preliminary analysis of this data and the conclusions that can be made from it.
This research was supported by the NOAO/KPNO Research Experiences for Undergraduates (REU) Program which is funded by the National Science Foundation Research Experiences for Undergraduates Program and the Department of Defense ASSURE program through Scientific Program Order No. 13 (AST-0754223) of the Cooperative Agreement No. AST-0132798 between the Association of Universities for Research in Astronomy (AURA) and the NSF.

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