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High-Resolution Imaging Spectroscopy at Terahertz Frequencies

Published online by Cambridge University Press:  12 April 2016

Robert L. Brown ,
Anthony R. Kerr ,
A. Richard Thompson  and
Frederic R. Schwab
Robert L. Brown
Affiliation:
National Radio Astronomy Observatory, *Charlottesville, VA
Anthony R. Kerr
Affiliation:
National Radio Astronomy Observatory, *Charlottesville, VA
A. Richard Thompson
Affiliation:
National Radio Astronomy Observatory, *Charlottesville, VA
Frederic R. Schwab
Affiliation:
National Radio Astronomy Observatory, *Charlottesville, VA

Abstract

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HISAT, a multi-element heterodyne interferometer attached to Space Station Freedom, will provide spectroscopic images with unprecedented detail of those submillimeter lines of C,O and C+ which are critical diagnostics of UV excitation in the Galaxy. With the arcsecond angular resolution achievable from the space station, HISAT will reveal:

  1. – The distribution of sources of ultraviolet radiation in the Galaxy;

  2. –The effective temperature of the UV radiation as a function of galactocentric radius;

  3. – The chemical and isotopic enhancement of atomic carbon and oxygen with galactic radius;

  4. – The propagation of UV radiation in molecular clouds and its stimulative, or inhibitive, effect on star formation;

  5. – The density structure, dumpiness or fragmentation, of molecular clouds throughout the Galaxy. HISAT has been selected by NASA for a concept-phase study.

Type
V. Long Term Future Issues
Information
International Astronomical Union Colloquium , Volume 123: Observatories in Earth Orbit and Beyond , 1990 , pp. 509 - 515
Copyright
Copyright © Kluwer 1990