Computer Science – Performance
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dms..conf...82w&link_type=abstract
DEEP MILLIMETER SURVEYS Implications for Galaxy Formation and Evolution. Held 19-21 June 2000 in University of Massachusetts, Am
Computer Science
Performance
Scientific paper
We present the description of a near infrared extension to the 9.2-m Hobby-Eberly Telescope (HET) Low Resolution Spectrograph (LRS), which will cover the wavelength range of 0.87 to 1.35 μm. The LRS-J, an upgrade to the existing LRS, replaces the optical camera with an f/1 camera optimized for the J-band. The instrument design is strongly motivated by the desire to observe galaxies at 1 < z < 2, where the principal emission lines indicative of star formation are shifted into the J-band. The cryogenically cooled camera will be mated to the warm LRS spectrograph, which does not result in enough thermal emission background to compromise its performance since we are primarily interested in wavelengths up to 1.35 μm for redshifts up to z = 2. LRS-J represents a rapid and cost-effective way to enable multi-object near IR spectroscopy on an 8-meter class telescope. The camera will use a Hawaii 10242 HgCdTe detector array in a dewar cooled by a hybrid closed cycle helium refrigerator and LN2 tank. A novel feature of the instrument is the use of large volume holographic (VH) grisms, which will approach efficiencies of 90% in the near IR. The complete instrument will achieve peak efficiencies in the J-band of 25% on the sky. The spectral range will be covered by 2 grisms, resulting in instrument resolving power of R = 1400 - 1600. Simulations of predicted instrument performance and planned galaxy evolution studies are presented.
Hill Gary J.
Tufts Joseph R.
Wolf Marsha J.
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