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Development of a broadband submillimeter grating spectrometer

Benford, D. J. and Serabyn, E. and Phillips, T. G. and Moseley, S. H. (1998) Development of a broadband submillimeter grating spectrometer. In: Advanced Technology MMW, Radio, and Terahertz Telescopes. Proceedings of SPIE. No.3357. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 278-288. ISBN 9780819428042.

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One of the central issues in astronomy is the formation and evolution of galaxies at large redshifts. Submillimeter observations are essential to understanding these processes. One of the best prospects for high redshift submillimeter observations is the study of the C_(II) 158 micrometer fine- structure line, which carries about 0.2% of the total luminosity of nearby starburst galaxies. However, current heterodyne receivers at submillimeter observatories have insufficient bandwidth to detect the full extent of highly broadened emission lines. We are developing a broadband grating spectrometer for the Caltech Submillimeter Observatory with a total bandwidth of ~3400 km/s and a velocity resolution of 200 km/s. The detectors will be a linear array of 32 close-packed monolithic silicon bolometers developed at NASA's Goddard Space Flight Center. In order to achieve background-limited sensitivity, the bolometers will be cooled to 100 mK by an adiabatic demagnetization refrigerator. The spectrometer optics will consist of a tunable cryogenic immersion grating using broadband filters as order sorters. The spectrometer will be optimized to operate in the 350 µm and 450 µm atmospheric windows. Calculations of the sensitivity of the spectrometer reveal that an ultraluminous infrared galaxy of 10^(12) L_⊙ at a redshift of z = 1 would be detectable at the 3σ level in the C_(II) line with 20 minutes of integration time.

Item Type:Book Section
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Benford, D. J.0000-0002-9884-4206
Additional Information:© 1998 Society of Photo-Optical Instrumentation Engineers (SPIE). The bolometer arrays are fabricated at NASA-Goddard Space Flight Center through the tireless efforts of C. A. Allen. Many thanks are due to T.R. Hunter for help in the early work on this instrument. This work has been funded by NSF contract #AST 9615025 and NASA contract #NAG5-4196. D.J. Benford is partially supported by a NASA Graduate Student Fellowship.
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NASA Graduate Student Research FellowshipUNSPECIFIED
Subject Keywords:Spectrometer, grating, bolometer, submillimeter
Series Name:Proceedings of SPIE
Issue or Number:3357
Record Number:CaltechAUTHORS:20180809-161901613
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Official Citation:Dominic J. Benford, Eugene Serabyn, Thomas G. Phillips, Samuel Harvey Moseley, "Development of a broadband submillimeter grating spectrometer", Proc. SPIE 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes, (31 July 1998); doi: 10.1117/12.317363;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88728
Deposited By: George Porter
Deposited On:10 Aug 2018 14:33
Last Modified:16 Nov 2021 00:29

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