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Proceedings Paper

The Infrared Imaging Spectrograph (IRIS) for TMT: sensitivities and simulations
Author(s): Shelley A. Wright; Elizabeth J. Barton; James E. Larkin; Anna M. Moore; David Crampton; Luc Simard
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Paper Abstract

We present sensitivity estimates for point and resolved astronomical sources for the current design of the InfraRed Imaging Spectrograph (IRIS) on the future Thirty Meter Telescope (TMT). IRIS, with TMT's adaptive optics system, will achieve unprecedented point source sensitivities in the near-infrared (0.84 - 2.45 μm) when compared to systems on current 8-10m ground based telescopes. The IRIS imager, in 5 hours of total integration, will be able to perform a few percent photometry on 26 - 29 magnitude (AB) point sources in the near-infrared broadband filters (Z, Y, J, H, K). The integral field spectrograph, with a range of scales and filters, will achieve good signal-to-noise on 22 - 26 magnitude (AB) point sources with a spectral resolution of R=4,000 in 5 hours of total integration time. We also present simulated 3D IRIS data of resolved high-redshift star forming galaxies (1 < z < 5), illustrating the extraordinary potential of this instrument to probe the dynamics, assembly, and chemical abundances of galaxies in the early universe. With its finest spatial scales, IRIS will be able to study luminous, massive, high-redshift star forming galaxies (star formation rates ~ 10 - 100 MΘ yr-1) at ~100 pc resolution. Utilizing the coarsest spatial scales, IRIS will be able to observe fainter, less massive high-redshift galaxies, with integrated star formation rates less than 1 MΘsensitivity compared to current integral field spectrographs. The combination of both fine and coarse spatial scales with the diffraction-limit of the TMT will significantly advance our understanding of early galaxy formation processes and their subsequent evolution into presentday galaxies.

Paper Details

Date Published: 21 July 2010
PDF: 13 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77357P (21 July 2010); doi: 10.1117/12.856501
Show Author Affiliations
Shelley A. Wright, Univ. of California, Berkeley (United States)
Elizabeth J. Barton, Univ. of California, Irvine (United States)
James E. Larkin, Univ. of California, Los Angeles (United States)
Anna M. Moore, California Institute of Technology (United States)
David Crampton, Herzberg Institute of Astrophysics, National Research Council Canada (Canada)
Thirty Meter Telescope Project (United States)
Luc Simard, Herzberg Institute of Astrophysics, National Research Council Canada (Canada)
Thirty Meter Telescope Project (United States)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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