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Proceedings Paper

A broadband millimeter-wave spectrometer Z-spec: sensitivity and ULIRGs
Author(s): Hanae Inami; Matt Bradford; James Aguirre; Lieko Earle; Bret Naylor; Hideo Matsuhara; Jason Glenn; Hien Nguyen; James J. Bock; Jonas Zmuidzinas; Youichi Ohyama
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Paper Abstract

Z-Spec is a cryogenic, broadband, millimeter-wave grating spectrometer. It is capable of obtaining many spectral lines simultaneously because of its unprecedented broad bandwidth (185-305GHz). The bandpass covers the 1mm atmospheric transmission window with a resolving power of 250-400. Z-Spec uses 160 silicon nitride micromesh bolometers cooled down to less than 100mK for background-limited performance. The unique capability of Z-Spec to detect multiple lines simultaneously allows us to obtain information efficiently on the physical and chemical conditions of nearby Ultra-luminous Infrared Galaxies (ULIRGs) powered by starbursts or Active Galactic Nuclei. Here we report on new millimeter-wave broadband data for ULIRGs acquired with Z-Spec and the noise performance and achieved sensitivity in observations with the CSO. We found that during the observations the noise scales with the atmospheric opacity and can be explained well by our sensitivity model, considering the photon noise originating from the sky and the telescope, as well as the detector and electronics noise. The photon noise is found to dominate the total noise.

Paper Details

Date Published: 19 July 2008
PDF: 8 pages
Proc. SPIE 7020, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV, 70201T (19 July 2008); doi: 10.1117/12.788711
Show Author Affiliations
Hanae Inami, The Graduate Univ. for Advanced Studies (Japan)
Japan Aerospace Exploration Agency (Japan)
Matt Bradford, California Institute of Technology (United States)
Jet Propulsion Lab. (United States)
James Aguirre, Univ. of Colorado at Boulder (United States)
Lieko Earle, Univ. of Colorado at Boulder (United States)
Bret Naylor, Jet Propulsion Lab. (United States)
Hideo Matsuhara, Japan Aerospace Exploration Agency (Japan)
Jason Glenn, Univ. of Colorado at Boulder (United States)
Hien Nguyen, Jet Propulsion Lab. (United States)
James J. Bock, California Institute of Technology (United States)
Jet Propulsion Lab. (United States)
Jonas Zmuidzinas, Univ. of Colorado at Boulder (United States)
Youichi Ohyama, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)


Published in SPIE Proceedings Vol. 7020:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV
William D. Duncan; Wayne S. Holland; Stafford Withington; Jonas Zmuidzinas, Editor(s)

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