The infrared imaging spectrograph (IRIS) for TMT: latest science cases and simulations

Wright, Shelley A.; Walth, Gregory; Do, Tuan; Marshall, Daniel; Larkin, James E.; Moore, Anna; Ádámkovics, Máté; Andersen, David R.; Armus, L.; Barth, Aaron J.; Côté, Patrick; Cooke, Jeff; Chisholm, Eric; Davidge, T. J.; Dunn, Jennifer; Dumas, Christophe; Ellerbroek, Brent L.; Ghez, A. M.; Hao, Liping; Hayano, Yutaka; Liu, Mengmeng; López-Rodríguez, Enrique; Lu, Jessica R.; Mao, Shude; Marois, Christian; Phillips, Andrew C.; Schoeck, Matthias; Subramaniam, Annapurni; Subramanian, Smitha; Suzuki, Ryuji; Tan, Jonathan C.; Terai, Tsuyoshi; Treu, Tommaso; Simard, Luc; Weiss, Jason; Wincentsen, James; Wong, Michael H.; Zhang, Kai

doi:10.1117/12.2233182

Cited by 14 publications

(11 citation statements)

References 37 publications

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“…OSIRIS on Keck, Larkin et al 2006), imminent (NIR-SPEC on JWST ), and future (e.g. IRIS on the Thirty Metre Telescope (TMT), Wright et al 2016) integral field spectrographs (IFSs). Finally, we use our results on the estimated precision of D d and D ∆t to forecast the cosmological precision that can be attained with the current sample of nine lenses for which accurate time delays and deep Hubble Space Telescope (HST ) imaging data are available, and for a sample of 40 lenses that is expected to be completed in the next few years by a dedicated follow-up campaign of newly discovered lenses from ongoing wide field imaging surveys [e.g.…”

Section: Introductionmentioning

confidence: 99%

Improving time-delay cosmography with spatially resolved kinematics

Shajib

Treu

Agnello

2017

Monthly Notices of the Royal Astronomical Society

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Strongly gravitational lensed quasars can be used to measure the so-called time-delay distance D ∆t , and thus the Hubble constant H 0 and other cosmological parameters. Stellar kinematics of the deflector galaxy play an essential role in this measurement by: (i) helping break the mass-sheet degeneracy; (ii) determining in principle the angular diameter distance D d to the deflector and thus further improving the cosmological constraints. In this paper we simulate observations of lensed quasars with integral field spectrographs and show that spatially resolved kinematics of the deflector enable further progress by helping break the mass-anisotropy degeneracy. Furthermore, we use our simulations to obtain realistic error estimates with current/upcoming instruments like OSIRIS on Keck and NIRSPEC on the James Webb Space Telescope for both distances (typically ∼ 6 per cent on D ∆t and ∼ 10 per cent on D d ). We use the error estimates to compute cosmological forecasts for the sample of nine lenses that currently have well measured time delays and deep Hubble Space Telescope images and for a sample of 40 lenses that is projected to be available in a few years through follow-up of candidates found in ongoing wide field surveys. We find that H 0 can be measured with 2 per cent (1 per cent) precision from nine (40) lenses in a flat Λcold dark matter cosmology. We study several other cosmological models beyond the flat Λcold dark matter model and find that time-delay lenses with spatially resolved kinematics can greatly improve the precision of the cosmological parameters measured by cosmic microwave background data.Gravitational lens systems where the source is variable in time provide a powerful direct measurement of distances, that is completely independent of the local distance ladder and the CMB (Refsdal 1964). Substantial progress in data quality, monitoring campaigns, and modelling techniques

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Section: Introductionmentioning

confidence: 99%

Improving time-delay cosmography with spatially resolved kinematics

Shajib

Treu

Agnello

2017

Monthly Notices of the Royal Astronomical Society

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“…We use the IRIS data simulator [11][12][13] to analyze the photometric effects of ghost images on the IRIS imager. Using the current specifications for IRIS's optical design and filter characteristics, we simulate the effects of the optical system, IRIS throughputs, sky background, ghosts, and Poisson noise.…”

Section: Introductionmentioning

confidence: 99%

The InfraRed Imaging Spectrograph (IRIS) for TMT: photometric precision and ghost analysis

Nils

Walth

Wright

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

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The InfraRed Imaging Spectrograph (IRIS) is a first-light instrument for the Thirty Meter Telescope (TMT) that will be used to sample the corrected adaptive optics field by NFIRAOS with a near-infrared (0.8 -2.4 µm) imaging camera and Integral Field Spectrograph (IFS). In order to understand the science case specifications of the IRIS instrument, we use the IRIS data simulator to characterize photometric precision and accuracy of the IRIS imager. We present the results of investigation into the effects of potential ghosting in the IRIS optical design. Each source in the IRIS imager field of view results in ghost images on the detector from IRIS's wedge filters, entrance window, and Atmospheric Dispersion Corrector (ADC) prism. We incorporated each of these ghosts into the IRIS simulator by simulating an appropriate magnitude point source at a specified pixel distance, and for the case of the extended ghosts redistributing flux evenly over the area specified by IRIS's optical design. We simulate the ghosting impact on the photometric capabilities, and found that ghosts generally contribute negligible effects on the flux counts for point sources except for extreme cases where ghosts coalign with a star of ∆m>2 fainter than the ghost source. Lastly, we explore the photometric precision and accuracy for single sources and crowded field photometry on the IRIS imager.

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“…The first light Adaptive Optics (AO) architecture for the TMT [1] has been defined to provide near-diffraction-limited wavefront quality and high sky coverage in the near infra-red (IR) for the first TMT science instruments IRIS (InfraRed Imaging Spectrograph) and IRMS (InfraRed Multislit Spectrometer) [2], [3] . It is a Laser Guide Star (LGS) Multi Conjugate AO (MCAO) architecture consisting of (i) the Narrow Field IR AO System (NFIRAOS) [4] , which feeds up to three science instrument ports after sensing and correcting for wavefront aberrations introduced by the atmospheric turbulence and the telescope itself, (ii) the Laser Guide Star Facility (LGSF), which generates multiple LGS in the mesospheric sodium layer with the brightness, beam quality and asterism geometry required by both NFIRAOS and later the second generation of TMT AO systems, and (iii) the Adaptive Optics Sequencer of the AO Executive Software, which automatically coordinates the operations of the AO systems with the remainder of the observatory for safe and efficient observations.…”

Section: Introductionmentioning

confidence: 99%

Adaptive optics program update at TMT

Boyer

Ellerbroek

2016

SPIE Proceedings

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The TMT first light AO facility consists of the Narrow Field Infra-Red AO System (NFIRAOS), the associated Laser Guide Star Facility (LGSF) and the AO Executive Software (AOESW). Design, fabrication and prototyping activities of the TMT first light AO systems and their components have significantly ramped up in Canada, China, France, and in the US. NFIRAOS is an order 60 x 60 laser guide star (LGS) multi-conjugate AO (MCAO) system, which provides uniform, diffraction-limited performance in the J, H, and K bands over 34 x 34 arc sec fields with 50 per cent sky coverage at the galactic pole, as required to support the TMT science cases. NFIRAOS includes two deformable mirrors, six laser guide star wavefront sensors, one high order Pyramid WFS for natural guide star AO, and up to three low-order, IR, natural guide star on-instrument wavefront sensors (OIWFS) and four on-detector guide windows (ODGW) within each client instrument. The first light LGSF system includes six sodium lasers to generate the NFIRAOS laser guide stars. In this paper, we will provide an update on the progress in designing, prototyping, fabricating and modeling the TMT first light AO systems and their AO components over the last two years. TMT is continuing with detailed AO modeling to support the design and development of the first light AO systems and components. Major modeling topics studied during the last two years include further studies in the area of pyramid wavefront sensing, high precision astrometry, PSF reconstruction for LGS MCAO, LGSF wavefront error budget and sophisticated low order mode temporal filtering.

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The infrared imaging spectrograph (IRIS) for TMT: latest science cases and simulations

Cited by 14 publications

References 37 publications

Improving time-delay cosmography with spatially resolved kinematics

Improving time-delay cosmography with spatially resolved kinematics

The InfraRed Imaging Spectrograph (IRIS) for TMT: photometric precision and ghost analysis

Adaptive optics program update at TMT

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