Keck Observatory in the TMT Era

Keck Strategic Planning meeting September 18, 2009

TMT has selected 13N at Mauna Kea

• MK process • CMP subplans need to be

completed• Final EIS submitted and

accepted• CDUA application prepared

and submitted• CDUP issued• Legal issues resolved• Schedule, with legal

challenge periods included and optimistically assuming success has CDUP issued in October 2010

TMT Early-Light capabilities

• MOBI: 0.32µ - 1µ, R=1000, 3000, 8000 (0.7 slit width), 40 arcmin2

LRIS-like with added cross-dispersed higher-R mode

NFIRAOS

• TMT AO system is designed to deliver rms wavefront error of 190nm and to pass a 2-arcminute (diameter) field, with good correction over 30-arcsecond (diameter) field.

• Performance is comparable to NGAO

5

InstrumentSpectral

ResolutionScience Case

Near-IR DL Spectrometer & Imager

(IRIS)~4000

Assembly of galaxies at large redshift

Black holes/AGN/Galactic Center

Resolved stellar populations in crowded fields

Astrometry

Wide-field Optical Spectrometer

(WFOS)1000-5000

IGM structure and composition 2<z<6

High-quality spectra of z>1.5 galaxies suitable for measuring stellar pops, chemistry, energetics

Near-field cosmology

Multi-slit near-DL near-IR Spectrometer

(IRMS)2000 - 5000

Near-IR spectroscopic diagnostics of the faintest objects

JWST follow-up

Mid-IR Echelle Spectrometer & Imager

(MIRES)5000 - 100000

Physical structure and kinematics of protostellar envelopes

Physical diagnostics of circumstellar/protoplanetary disks: where and when planets form during the accretion phase

ExAO I

(PFI)50 - 300

Direct detection and spectroscopic characterization of extra-solar planets

High Resolution Optical Spectrograph

(HROS)30000 - 50000

Stellar abundance studies throughout the Local Group

ISM abundances/kinematics, IGM characterization to z~6

Extra-solar planets!

MCAO imager

(WIRC)5 - 100

Precision astrometry

Stellar populations to 10Mpc

Near-IR, DL Echelle

(NIRES)5000 - 30000

Precision radial velocities of M-stars and detection of low-mass planets

IGM characterizations for z>5.5

TMT First Decade Instrument/Capability Suite

IRIS - Infrared imaging spectrometer

Grating

IRIS dewar

(at 77k)

Common spectrograph and camera for both IFUs

imager filter wheels

F/15 AO Focus

2’WFS

imagerIFUs

IRIS is OSIRIS-like. Works at diffraction limit, multiple plate scales

IRMS - Infrared multislit spectrometer

0.8 - 2.5 um cryogenic multi-slit spectrometer

2.3 arcmin field of view

0.06 arcsec sampling

46 moveable slits 2.4” long

Covers entire Y, J, H or K band at R = 4660

TMT Schedule

• Current first-light date with NFIRAOS, MOBIE, IRMS and IRIS is Fall 2018

• This is based on a resourced schedule and some assumptions about completing the partnership and feeding funding to the project.

• Not likely to be delivered any earlier than this• Commissioning will be carried out over irst two

years (only part of the time will be available for science)

Keck in the TMT Era

• Complementary capabilities– Wider-field MOS– High-R at all wavelengths– Visible-light AO– Natural complementarity set by source brightness

• Feeder capabilities• Complementary uses

– Concentrate on larger programs– Concentrate on specialized instruments