Share Email Print
cover

Proceedings Paper • new

The Infrared Imaging Spectrograph (IRIS) for TMT: advancing the data reduction system
Author(s): Gregory L. Walth; Shelley A. Wright; Nils-Erik Rundquist; David Andersen; Edward Chapin; Eric Chisholm; Tuan Do; Jennifer Dunn; Brent Ellerbroek; Kim Gillies; Yutaka Hayano; Chris Johnson; James Larkin; Takashi Nakamoto; Reed Riddle; Luc Simard; Roger Smith; Ryuji Suzuki; Ji Man Sohn; Robert Weber; Jason Weiss; Kai Zhang
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Infrared Imaging Spectrograph (IRIS) is the first light instrument for the Thirty Meter Telescope (TMT) that consists of a near-infrared (0.84 to 2.4 micron) imager and integral field spectrograph (IFS) which operates at the diffraction-limit utilizing the Narrow-Field Infrared Adaptive Optics System (NFIRAOS). The imager will have a 34 arcsec x 34 arcsec field of view with 4 milliarcsecond (mas) pixels. The IFS consists of a lenslet array and slicer, enabling four plate scales from 4 mas to 50 mas, multiple gratings and filters, which in turn will operate hundreds of individual modes. IRIS, operating in concert with NFIRAOS will pose many challenges for the data reduction system (DRS). Here we present the updated design of the real-time and post-processing DRS. The DRS will support two modes of operation of IRIS: (1) writing the raw readouts sent from the detectors and performing the sampling on all of the readouts for a given exposure to create a raw science frame; and (2) reduction of data from the imager, lenslet array and slicer IFS. IRIS is planning to save the raw readouts for a given exposure to enable sophisticated processing capabilities to the end users, such as the ability to remove individual poor seeing readouts to improve signal-to-noise, or from advanced knowledge of the point spread function (PSF). The readout processor (ROP) is a key part of the IRIS DRS design for writing and sampling of the raw readouts into a raw science frame, which will be passed to the TMT data archive. We discuss the use of sub-arrays on the imager detectors for saturation/persistence mitigation, on-detector guide windows, and fast readout science cases (< 1 second).

Paper Details

Date Published: 10 July 2018
PDF: 14 pages
Proc. SPIE 10707, Software and Cyberinfrastructure for Astronomy V, 1070731 (10 July 2018); doi: 10.1117/12.2314228
Show Author Affiliations
Gregory L. Walth, Univ. of California, San Diego (United States)
Shelley A. Wright, Univ. of California, San Diego (United States)
National Research Council of Canada (Canada)
Nils-Erik Rundquist, Univ. of California, San Diego (United States)
National Research Council of Canada (Canada)
David Andersen, NRC - Herzberg Astronomy & Astrophysics (Canada)
Edward Chapin, NRC - Herzberg Astronomy & Astrophysics (Canada)
Eric Chisholm, Thirty Meter Telescope (United States)
Tuan Do, Univ. of California, Los Angeles (United States)
Jennifer Dunn, NRC - Herzberg Astronomy & Astrophysics (Canada)
Brent Ellerbroek, Thirty Meter Telescope (United States)
Kim Gillies, Thirty Meter Telescope (United States)
Yutaka Hayano, National Astronomical Observatory of Japan (Japan)
Chris Johnson, Univ. of California, Los Angeles (United States)
James Larkin, Univ. of California, Los Angeles (United States)
Takashi Nakamoto, National Astronomical Observatory of Japan (Japan)
Reed Riddle, Caltech (United States)
Luc Simard, NRC - Herzberg Astronomy & Astrophysics (Canada)
Roger Smith, Caltech (United States)
Ryuji Suzuki, National Astronomical Observatory of Japan (Japan)
Ji Man Sohn, Univ. of California, Los Angeles (United States)
Robert Weber, Caltech (United States)
Jason Weiss, Thirty Meter Telescope (United States)
Kai Zhang, Nanjing Institute of Astronomical Optics & Technology (China)


Published in SPIE Proceedings Vol. 10707:
Software and Cyberinfrastructure for Astronomy V
Juan C. Guzman; Jorge Ibsen, Editor(s)

© SPIE. Terms of Use
Back to Top