HETDEX: Public Data Products

Details HETDEX: Public Data Products HETDEX: Public Data Products

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942424c&link_type=abstract

American Astronomical Society, AAS Meeting #219, #424.24

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Scientific paper

The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is a blind spectroscopic survey to map the evolution of dark energy using Lyman-alpha emitting galaxies as tracers. The survey instrument, VIRUS, consists of 75 IFUs distributed across the 22-arcmin field of the upgraded 9.2-m HET. Each 50x50 sq. arcsec IFU is made up of 448 1.5-arcsec fibers, and feeds a pair of spectrographs with a fixed bandpass of 350-550 nm and resolving power R 700. Each exposure gathers 33,600 spectra. Three dithers fill the area of an IFU. Observing 20 minutes per field, we reach a line flux limit of 3.5e-17 ergs-sec-1-cm-2 and mAB 22. The baseline survey will deliver spectra of 0.8M LAEs in a 9 cubic Gpc volume with 1.9 < z < 3.5, and 1M [OII] emitters with z < 0.48. In addition, the survey will cover 0.4M other galaxies, 0.25M stars, 2000 galaxy clusters, 7000 QSOs with z < 3.5, and 20,000 NVSS radio sources. The main survey area of 42x7 sq. deg. is centered at 13hr, +53deg. Within that 300 sq. deg. region we cover 1/4.5 with fibers; thus 60 sq. deg. of sky have spectra. Initial observations will be conducted from Spring 2013 through Spring 2015. Survey extensions are planned, including an equatorial field centered on 1.5hr, 0deg, covering 28x8 sq. deg. We expect a Year 1 data release 14 months after completion of the first year of observations, a Years 1-3 data release in Spring 2016, and then a full data release including any extensions. Each data release will consist of all flux-calibrated spectra, their absolute positions on the sky to 1 arcsec, and a timestamp.

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