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Large format heterodyne arrays for observing far-infrared lines with SOFIA

Walker, C. and Kulesa, C. and Kloosterman, J. and Lesser, D. and Cottam, T. and Groppi, C. and Zmuidzinas, J. and Edgar, M. and Radford, S. and Goldsmith, P. and Langer, W. and Yorke, H. and Kawamura, J. and Mehdi, I. and Hollenbach, D. and Stutzki, J. and Huebers, H. and Gao, J. R. and Martin, C. (2010) Large format heterodyne arrays for observing far-infrared lines with SOFIA. In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V. Proceedings of SPIE. No.7741. SPIE , Bellingham, WA, Art No. 751884. ISBN 9780819482310. http://resolver.caltech.edu/CaltechAUTHORS:20160302-164122983

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Abstract

In the wavelength regime between 60 and 300 microns there are a number of atomic and molecular emission lines that are key diagnostic probes of the interstellar medium. These include transitions of [CII], [NII], [OI], HD, H_2D^+, OH, CO, and H_2O, some of which are among the brightest global and local far-infrared lines in the Galaxy. In Giant Molecular Clouds (GMCs), evolved star envelopes, and planetary nebulae, these emission lines can be extended over many arc minutes and possess complicated, often self absorbed, line profiles. High spectral resolution (R > 10^5) observations of these lines at sub-arcminute angular resolution are crucial to understanding the complicated interplay between the interstellar medium and the stars that form from it. This feedback is central to all theories of galactic evolution. Large format heterodyne array receivers can provide the spectral resolution and spatial coverage to probe these lines over extended regions. The advent of large format (~100 pixel) spectroscopic imaging cameras in the far-infrared (FIR) will fundamentally change the way astronomy is performed in this important wavelength regime. While the possibility of such instruments has been discussed for more than two decades, only recently have advances in mixer and local oscillator technology, device fabrication, micromachining, and digital signal processing made the construction of such instruments tractable. These technologies can be implemented to construct a sensitive, flexible, heterodyne array facility instrument for SOFIA. The instrument concept for StratoSTAR: Stratospheric Submm/THz Array Receiver includes a common user mounting, control system, IF processor, spectrometer, and cryogenic system. The cryogenic system will be designed to accept a frontend insert. The frontend insert and associated local oscillator system/relay optics would be provided by individual user groups and reflect their scientific interests. Rapid technology development in this field makes SOFIA the ideal platform to operate such a modular, continuously evolving instrument.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.857811DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=751884PublisherArticle
Additional Information:© 2010 SPIE--The International Society for Optical Engineering.
Group:Keck Institute for Space Studies
Subject Keywords:TeraHertz, SOFIA, submillimeter, heterodyne, array receiver
Record Number:CaltechAUTHORS:20160302-164122983
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160302-164122983
Official Citation:C. Walker ; C. Kulesa ; J. Kloosterman ; D. Lesser ; T. Cottam, et al. "Large format heterodyne arrays for observing far-infrared lines with SOFIA", Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 77410Z (July 15, 2010); doi:10.1117/12.857811; http://dx.doi.org/10.1117/12.857811
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64975
Collection:CaltechAUTHORS
Deposited By: Colette Connor
Deposited On:03 Mar 2016 03:41
Last Modified:31 Oct 2016 22:37

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