SPIFI: a direct-detection imaging spectrometer for submillimeter wavelengths.

The South Pole Imaging Fabry-Perot Interferometer (SPIFI) is the first instrument of its kind-a direct-detection imaging spectrometer for astronomy in the submillimeter band. SPIFI's focal plane is a square array of 25 silicon bolometers cooled to 60 mK; the spectrometer consists of two cryogenic scanning Fabry-Perot interferometers in series with a 60-mK bandpass filter. The instrument operates in the short submillimeter windows (350 and 450 microm) available from the ground, with spectral resolving power selectable between 500 and 10,000. At present, SPIFI's sensitivity is within a factor of 1.5-3 of the photon background limit, comparable with the best heterodyne spectrometers. The instrument's large bandwidth and mapping capability provide substantial advantages for specific astrophysical projects, including deep extragalactic observations. We present the motivation for and design of SPIFI and its operational characteristics on the telescope.

[1]  Kiyomi Sakai,et al.  Far Infrared Metal Mesh Filters and Fabry-Perot Interferometry , 1983 .

[2]  J. Stutzki,et al.  A multi-line study of the molecular interstellar medium in M 82's starburst nucleus , 1992 .

[3]  G. Rieke.  Books-Received - Detection of Light - from the Ultraviolet to the Submillimeter , 1995 .

[4]  Eric Smith,et al.  Experimental Techniques in Condensed Matter Physics at Low Temperatures , 1989 .

[5]  D. Jaffe,et al.  OBSERVATIONS OF LARGE-SCALE C I EMISSION FROM S140 , 1994 .

[6]  N. Geis,et al.  The MPE/UCB far-infrared imaging Fabry-Perot interferometer (FIFI) , 1990 .

[7]  Goutam Chattopadhyay,et al.  A Low Noise NbTiN-Based 850 GHz SIS Receiver for the Caltech Submillimeter Observatory , 2000 .

[8]  Gordon J. Stacey,et al.  KWIC: a widefield mid-infrared array camera/spectrometer for the KAO , 1993, Defense, Security, and Sensing.

[9]  Eugene Serabyn,et al.  Atmospheric transmission at microwaves (ATM): an improved model for millimeter/submillimeter applications , 2001 .

[10]  R Winston,et al.  Heat trap: an optimized far infrared field optics system. , 1976, Applied optics.

[11]  Gordon J. Stacey,et al.  Stressed and unstressed Ge:Ga detector arrays for airborne astronomy , 1992 .

[12]  J. Lamarre.  Photon noise in photometric instruments at far-infrared and submillimeter wavelengths. , 1986, Applied optics.

[13]  A. F. Clark.  Experimental techniques in low temperature physics , 1979 .

[14]  Tim Jenness,et al.  SCUBA: a submillimeter camera operating on the James Clerk Maxwell Telescope , 1998, Astronomical Telescopes and Instrumentation.

[15]  S. Moseley,et al.  Thermal detectors as X-ray spectrometers , 1984 .

[16]  S. Moseley,et al.  Thermal calorimeters for high resolution X-ray spectroscopy , 1993 .

[17]  John E. Carlstrom,et al.  Millimeter and Submillimeter Techniques , 1996 .

[18]  J. Carlstrom,et al.  The detection of [C I] in molecular outflows associated with young stellar objects , 1993 .

[19]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[20]  Dominic J. Benford,et al.  Noise Equivalent Power of Background Limited Thermal Detectors at Submillimeter Wavelengths , 1998 .

[21]  M. Gerin,et al.  Atomic Carbon in Arp 220 , 1998 .

[22]  E. Palik.  Handbook of Optical Constants of Solids , 1997 .

[23]  P. J. Huggins,et al.  The abundance of atomic carbon near the ionization fronts in M17 and S140 , 1985 .

[24]  J. Mather,et al.  Bolometers: ultimate sensitivity, optimization, and amplifier coupling. , 1984, Applied optics.

[25]  D. McCammon,et al.  Thermal calorimeters for high resolution X-ray spectroscopy , 1993 .

[26]  E. Serabyn,et al.  Characterization of a submillimeter high-angular-resolution camera with a monolithic silicon bolometer array for the Caltech Submillimeter Observatory. , 1996, Applied optics.

[27]  Caroline K. Stahle,et al.  Intrinsic 1/f noise in doped silicon thermistors for cryogenic calorimeters , 1998, Optics & Photonics.

[28]  Mark R. Swain,et al.  Design of the South Pole imaging Fabry-Perot interferometer (SPIFI) , 1996, Astronomical Telescopes and Instrumentation.

[29]  S. Moseley,et al.  A sounding rocket payload for X-ray astronomy employing high-resolution microcalorimeters , 1996 .

[30]  D. Goldhaber,et al.  Neutral atomic carbon in dense molecular clouds , 1988 .

[31]  Harri Michael Latvakoski,et al.  High Spatial Resolution Mid and Far-Infrared Imaging of the Galactic Center , 1997 .

[32]  Eugene Serabyn,et al.  Submillimeter atmospheric transmission measurements on Mauna Kea during extremely dry El Nino conditions: implications for broadband opacity contributions , 2001 .

[33]  Marc J. Feldman,et al.  Quantum detection at millimeter wavelengths , 1985 .