IRIS is a first generation near-infrared (0.84-2.4 μm) instrument being designed to sample the diffraction limit of the Thirty Meter Telescope (TMT). IRIS will include an integral field spectrograph (IFS) with R>4000 and imaging camera (34"x34"). Both the IFS and imager will take advantage of the high spatial resolution achieved with the Narrow-Field Infrared Adaptive Optics System (NFIRAOS). The IFS will provide four spatial scales (0.004", 0.009", 0.025", 0.05"). IRIS will achieve an angular resolution ten times better than images from the Hubble Space Telescope, and will be the highest angular resolution near-infrared instrument in the world.
The Wide Field Optical Spectrometer (WFOS) is being developed as a first light instrument capability. WFOS will provide near-ultraviolet and optical spectroscopy over 0.31 – 1.0 μm (in two channels spanning 310 nm – 550 nm and 500 nm – 1000 nm) of many objects simultaneously (R~1500 – 3500 with 0.75” wide slits) over an 4.2x9.6 square arcminute field-of-view with 0.05”/pixel sampling. Pre-made slit masks with 576 arc second total slit length can accommodate, for example, 67 targets with 8” long slits and 0.5” gaps. Broad band imaging and observations of single objects are also planned modes. WFOS will be designed to operate in seeing limited conditions. Higher spectral resolution can be achieved using narrower slits.
Current Status: Conceptual Design Stage
MODHIS is a multi-object diffraction-limited high-resolution infrared facility for TMT-NFIRAOS. The notional concept features a very compact and stable, cost-effective design built to fully exploit the existing NFIRAOS infrastructure and boost the scientific reach of TMT after first light. MODHIS is based on the latest diffraction-limited single-mode fiber injection, detector, multiplexing, and calibration (Laser Frequency Comb) technologies, and will provide unprecedented capabilities to the TMT community, potentially soon after the commissioning and science verification of NFIRAOS and IRIS, which it perfectly complements. MODHIS will take R ≃100,000 spectra from 0.95 to 2.5 μm simultaneously, of up to 8 objects in a r=5” field of view sampled at the diffraction limit.
The first light Adaptive Optics (AO) architecture for the TMT 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 and IRMS. Design, fabrication and prototyping activities of the TMT first light AO systems and their components in Canada, China, France, and in the US are currently on schedule.
The entire TMT observatory has been designed to support a wide range of different forms of facility class instrumentation. To do this, a suite of instrument concepts was developed and the observatory design was developed around them. These longstanding ideas for instruments have continued to evolve. Several instrument concepts are being actively developed and are evolving beyond the original ideas. Several new ideas have also arisen and may be developed further. The prioritization of needed instrument capabilities and the resulting strategy or sequence for instrument development is based on community explorations.