A Decade of SCUBA-2: A Comprehensive Guide to Calibrating 450 $μ$m and 850 $μ$m Continuum Data at the JCMT
Authors:
Steve Mairs,
Jessica T. Dempsey,
Graham S. Bell,
Harriet Parsons,
Malcolm J. Currie,
Per Friberg,
Xue-Jian Jiang,
Alexandra J. Tetarenko,
Dan Bintley,
Jamie Cookson,
Shaoliang Li,
Mark G. Rawlings,
Jan Wouterloot,
David Berry,
Sarah Graves,
Izumi Mizuno,
Alexis Ann Acohido,
Alyssa Clark,
Jeff Cox,
Miriam Fuchs,
James Hoge,
Johnathon Kemp,
E'lisa Lee,
Callie Matulonis,
William Montgomerie
, et al. (2 additional authors not shown)
Abstract:
The Submillimetre Common User Bolometer Array 2 (SCUBA-2) is the James Clerk Maxwell Telescope's continuum imager, operating simultaneously at 450 and 850~$μ$m. SCUBA-2 was commissioned in 2009--2011 and since that time, regular observations of point-like standard sources have been performed whenever the instrument is in use. Expanding the calibrator observation sample by an order of magnitude com…
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The Submillimetre Common User Bolometer Array 2 (SCUBA-2) is the James Clerk Maxwell Telescope's continuum imager, operating simultaneously at 450 and 850~$μ$m. SCUBA-2 was commissioned in 2009--2011 and since that time, regular observations of point-like standard sources have been performed whenever the instrument is in use. Expanding the calibrator observation sample by an order of magnitude compared to previous work, in this paper we derive updated opacity relations at each wavelength for a new atmospheric-extinction correction, analyze the Flux-Conversion Factors (FCFs) used to convert instrumental units to physical flux units as a function of date and observation time, present information on the beam profiles for each wavelength, and update secondary-calibrator source fluxes. Between 07:00 and 17:00 UTC, the portion of the night that is most stable to temperature gradients that cause dish deformation, the total-flux uncertainty and the peak-flux uncertainty measured at 450~$μ$m are found to be 14\% and 17\%, respectively. Measured at 850~$μ$m, the total-flux and peak-flux uncertainties are 6\%, and 7\%, respectively. The analysis presented in this work is applicable to all SCUBA-2 projects observed since 2011.
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Submitted 28 July, 2021;
originally announced July 2021.
Commissioning of Namakanui on the JCMT
Authors:
Izumi Mizuno,
Per Friberg,
Ryan Berthold,
Harriet Parsons,
Chih-Chiang Han,
Alexis Acohido,
Graham Bell,
David Berry,
Dan Bintley,
Ming-Tang Chen,
Alyssa Clark,
Jamie Cookson,
Vernon Demattos,
Jessica Dempsey,
Jason Fleck,
Kuo-chieh Fu,
Miriam Fuchs,
Sarah Graves,
Paul Ho,
Sung-Po Hsu,
YauDe Huang,
Xue-Jian Jiang,
Derek Kubo,
JohnKuroda,
Shaoliang Li
, et al. (17 additional authors not shown)
Abstract:
Namakanui is an instrument containing three inserts in an ALMA type Dewar. The three inserts are Alaihi, Uu and Aweoweo operating around 86, 230 and 345GHz. The receiver is being commissioned on the JCMT. It will be used for both Single dish and VLBI observations. We will present commissioning results and the system.
Namakanui is an instrument containing three inserts in an ALMA type Dewar. The three inserts are Alaihi, Uu and Aweoweo operating around 86, 230 and 345GHz. The receiver is being commissioned on the JCMT. It will be used for both Single dish and VLBI observations. We will present commissioning results and the system.
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Submitted 14 December, 2020;
originally announced December 2020.