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A broadband millimeter-wave spectrometer Z-Spec: sensitivity and ULIRGs

Inami, Hanae and Bradford, Matt and Aguirre, James and Earle, Lieko and Naylor, Bret and Matsuhara, Hideo and Glenn, Jason and Nguyen, Hien and Bock, James J. and Zmuidzinas, Jonas and Ohyama, Youichi (2008) A broadband millimeter-wave spectrometer Z-Spec: sensitivity and ULIRGs. In: Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV. Proceedings of SPIE. No.7020. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 70201T. ISBN 9780819472304.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Inami, Hanae0000-0003-4268-0393
Aguirre, James0000-0002-4810-666X
Glenn, Jason0000-0001-7527-2017
Bock, James J.0000-0002-5710-5212
Ohyama, Youichi0000-0001-9490-3582
Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). We thank all the CSO staff for supporting us to perform the Z-Spec observations successfully. H. Inami thanks the graduate university of advanced study for supporting the travel cost for visiting Caltech and JPL to complete this work. L. Earle is supported by NASA GSRP fellowship (NGTS-50478). J. Aguirre is funded by a Jansky Fellowship from NRAO. J. Glenn acknowledges an NSF Career Grant in support of Z-Spec (AST-0239270) and an Innovation Award from the Research Corporation (RI0928). This work was supported in part by NASA SARA grants NAGS-11911 and NAGS-12788.
Funding AgencyGrant Number
NASA Graduate Student Research FellowshipNGTS-50478
National Radio Astronomy Observatory (NRAO)UNSPECIFIED
Research CorporationRI0928
Subject Keywords:millimeter, spectrometer, line survey, sensitivity, ULIRGs
Series Name:Proceedings of SPIE
Issue or Number:7020
Record Number:CaltechAUTHORS:20190517-132002351
Persistent URL:
Official Citation:Hanae Inami, Matt Bradford, James Aguirre, Lieko Earle, Bret Naylor, Hideo Matsuhara, Jason Glenn, Hien Nguyen, James J. Bock, Jonas Zmuidzinas, and Youichi Ohyama "A broadband millimeter-wave spectrometer Z-spec: sensitivity and ULIRGs", Proc. SPIE 7020, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV, 70201T (19 July 2008); doi: 10.1117/12.788711;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95568
Deposited By: Tony Diaz
Deposited On:20 May 2019 17:58
Last Modified:09 Mar 2020 13:18

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