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GMTIFS – An AO-Corrected Integral-Field Spectrograph and Imager for GMT Peter McGregor The Australian National University.

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Presentation on theme: "GMTIFS – An AO-Corrected Integral-Field Spectrograph and Imager for GMT Peter McGregor The Australian National University."— Presentation transcript:

1 GMTIFS – An AO-Corrected Integral-Field Spectrograph and Imager for GMT Peter McGregor The Australian National University

2 AO-Corrected IFS GMT 2010 Korea - 2010 October 4-6 Integral Field UnitSpectrographAdaptive Optics GMT LTAO SystemGMTIFS Δv = 60 km/sΔx = 6-50 mas 1 kHz 2

3 MOTIVATIONS GMT 2010 Korea - 2010 October 4-6 3

4 Motivation - IFS AO-corrected integral-field spectroscopy was pioneered on 8-10m telescopes NIFS on Gemini, SINFONI on VLT, OSIRIS on Keck These have enabled “AO spectroscopy” It is now an essential feature on ~30 m telescopes Imaging studies brightnesses, colors, morphology Spectroscopy studies kinematics, excitation, physical processes GMT 2010 Korea - 2010 October 4-6 4

5 Motivation - GMT Deliver better angular resolution with Laser Tomography Adaptive Optics (LTAO) Diffraction-limited FWHM on GMT is ~ 16 mas at 1.6 μm Black-hole masses, protoplanetary disks Diffraction-limited sampling, small FOV Collect more light from faint objects Partial AO correction, but not diffraction limit Galaxy dynamics: 0.05 arcsec sampling, 3 arcsec FOV GMTIFS will benefit in both these ways GMT 2010 Korea - 2010 October 4-6 5

6 GMTIFS – Overview Near-infrared; 1-2.5 μm Single-object, AO-corrected, integral-field spectroscopy Primary science instrument Two spectral resolutions: R = 5000 (Δv = 60 km/s) & 10000 (Δv = 30 km/s) Range of spatial sampling and fields of view: Narrow-field, AO-corrected, imaging camera Secondary science instrument 5 mas/pixel, 20.4× 20.4 arcsec FOV Acquisition camera for IFS NIR tip-tilt wave front sensor 150 arcsec diam. guide field Flat-field and wavelength calibration GMT 2010 Korea - 2010 October 4-6 6 Spaxel size (mas)6122550 Field of view (arcsec)0.54×0.271.08×0.542.25×1.134.5×2.25

7 GMTIFS on Instrument Platform 7 GMT 2010 Korea - 2010 October 4-6

8 SCIENCE DRIVERS GMT 2010 Korea - 2010 October 4-6 8

9 9 GMT Science Drivers Planets and Their Formation Imaging of exosolar planets Radial velocity searches for exoplanets Structure and dynamics of proto- planetary debris disks Star formation and the initial mass function Stellar Populations and Chemical Evolution Imaging of crowded populations Chemistry of halo giants in Local Group galaxies Assembly of Galaxies The mass evolution of galaxies Chemical evolution of galaxies Tomography of the inter-galactic medium Black Holes Mass determinations Dark Energy and the Accelerating Universe Baryonic oscillations at z > 4 Supernovae at z > 1 First Light and Reionization The reionization era First Light

10 GMT 2010 Korea - 2010 October 4-6 10 GMT Science Drivers Planets and Their Formation Imaging of exosolar planets Radial velocity searches for exoplanets Structure and dynamics of proto- planetary debris disks Star formation and the initial mass function Stellar Populations and Chemical Evolution Imaging of crowded populations Chemistry of halo giants in Local Group galaxies Assembly of Galaxies The mass evolution of galaxies Chemical evolution of galaxies Tomography of the inter-galactic medium Black Holes Mass determinations Dark Energy and the Accelerating Universe Baryonic oscillations at z > 4 Supernovae at z > 1 First Light and Reionization The reionization era First Light

11 GMT 2010 Korea - 2010 October 4-6 11 GMT Science Drivers Planets and Their Formation Imaging of exosolar planets Radial velocity searches for exoplanets Structure and dynamics of proto- planetary debris disks Star formation and the initial mass function Stellar Populations and Chemical Evolution Imaging of crowded populations Chemistry of halo giants in Local Group galaxies Assembly of Galaxies The mass evolution of galaxies Chemical evolution of galaxies Tomography of the inter-galactic medium Black Holes Mass determinations Dark Energy and the Accelerating Universe Baryonic oscillations at z > 4 Supernovae at z > 1 First Light and Reionization The reionization era First Light

12 SCIENCE DRIVER The Formation of Disk Galaxies at High Redshift GMT 2010 Korea - 2010 October 4-6 12

13 High-z Disk Galaxies Disk formation process Rotational velocity vs velocity dispersion (V rot /σ ~ 1-5 at z ~ 2) Mass accumulation history Hα dynamics Star formation history Hα luminosity Chemical abundance history Rest-frame optical emission-line ratios GMT 2010 Korea - 2010 October 4-6 13

14 HUDF Chain Galaxies & Clump Clusters GMT 2010 Korea - 2010 October 4-6 14 ACS V NICMOS H Clump ClustersChain Galaxies Bulge Bulgeless Elmegreen et al. (2008)

15 High-z Disk Galaxies GMT 2010 Korea - 2010 October 4-6 15 Elmegreen et al. (2009) Clump Cluster Early Bulge Flocculent Spiral Mature Spiral

16 GDDS-22 2172 with NIFS GMT 2010 Korea - 2010 October 4-6 16 Hα 0.6563 [N II] 0.6583 1.0 arcsec z = 1.563, 10 hr on Gemini North

17 Disk Galaxy at z=2.35; 6 x 900 s GMT 2010 Korea - 2010 October 4-6 17 GMTIFSsim simulation HUDF - i

18 Disk Galaxy at z=2.35; 6 x 900 s GMT 2010 Korea - 2010 October 4-6 18 V rot σ Line Central Intensity Continuum

19 GMT 2010 Korea - 2010 October 4-6 19 Line Luminosities Tresse et al. (2001)Erb et al. (2006) NIRSPEC (K) SINFONI/OSIRIS + AO GMTIFS - detectable GMTIFS – not detectable F(line) = 3x10 -17 erg/s/cm 2 Hα 6563 [O II] 3727 [O III] 5007

20 SCIENCE DRIVER Massive Nuclear Black Holes GMT 2010 Korea - 2010 October 4-6 20

21 Nuclear Black Holes GMT 2010 Korea - 2010 October 4-6 21 Graham (2008)

22 22 Nuclear Black Holes High spatial resolution is required at high-mass end R = GM BH /σ 2 ~ 10.8 pc (M BH /10 8 M ☼ )(σ/200 km/s) -2 ~ 35.3 pc (M BH /10 9 M ☼ )(σ/350 km/s) -2 H-band diffraction limit = 0.014" 10 pc @ z = 0.04 35 pc @ z = 0.15 High spectral resolution is required at low-mass end Probe 10 4 -10 6 M ☼ black holes in clusters Velocity dispersions ~ 20-60 km/s => FWHM ~ 40-140 km/s Requires R ~ 10,000 (Δv ~ 30 km/s) to detect presence of black hole GMT 2010 Korea - 2010 October 4-6

23 23 High-Mass Black Holes How massive do MBHs get (> 10 9 M ☼ )? M BH vs L and M BH vs σ give disparate results What is the space density of MBHs? GMT 2010 Korea - 2010 October 4-6 > 5×10 9 M ☼ from Karl Gebhardt

24 Stellar Velocity Dispersion Stellar absorption features CO Δv=2 at ~ 2.3 μm CO Δv=3 at ~ 1.7 μm Ca II triplet at ~ 0.85 μm Challenges of GMT Meeting - 2010 June 15-16 24 Watson et al. 2008, ApJ, 682, L21

25 Circumnuclear Gas Disks GMT 2010 Korea - 2010 October 4-6 25 Cygnus A Pα 1.876 μm: 2×10 9 M ☼

26 Nuclear Star Clusters GMT 2010 Korea - 2010 October 4-6 26 Ferrarese et al. (2006) Follow the black hole scaling relations

27 Low-Mass BlackHoles/Star Clusters GMT 2010 Korea - 2010 October 4-6 27 Scarlata et al. (2004) 5"5"

28 SCIENCE DRIVER Protoplanetary Disks and Outflows from Young Stars GMT 2010 Korea - 2010 October 4-6 28

29 Protostellar Disks and Outflows GMT 2010 Korea - 2010 October 4-6 29

30 GMT 2010 Korea - 2010 October 4-6 30 DG Tau – Integrated [Fe II] (2005) NIFS H band Inclination ~ 60° > 5:1 jet aspect ratio Launch radius expected to be ~ 1 AU 20 AU resolution with NIFS 3 AU resn. with GMT at diffraction limit 100 AU 1 yr at 200 km/s 20 AU

31 Protoplanetary Disks & Outflows DG Tau jet with NIFS [Fe II] 1.644 μm One stationary clump One moving clump 0.2 arcsec in 13 months 130 km/s We will see changes in ~ 1 month with GMT! GMT 2010 Korea - 2010 October 4-6 31 2007 20062005 2004 2008 2009 2010 2003

32 GMT 2010 Korea - 2010 October 4-6 32 DG Tau – Entrainment? -50-100-150 Bicknell (1984)

33 INSTRUMENT DESIGN GMT 2010 Korea - 2010 October 4-6 33

34 LGS WFS NGS WFS GMTIFS Light Paths GMT 2010 Korea - 2010 October 4-6 34 AO WFSsGMTIFS NIR NGS WFS IFS F-converters Imager Calibration Dichroic Opt LGS NIR ADC

35 Maximal Cryostat Design GMT 2010 Korea - 2010 October 4-6 35

36 NIR WFS Feed GMT 2010 Korea - 2010 October 4-6 36 Tertiary Dichroic Window Compensator Field lens Beam-steering mirror Tip-tilt wave-front sensor

37 Fore-Optics Layout GMT 2010 Korea - 2010 October 4-6 37 Science fold mirror Relay Rotating cold-stop mask

38 Imager Layout GMT 2010 Korea - 2010 October 4-6 38 Relay Atmospheric Dispersion Corrector Imager feed Imager filter wheels Imager utility wheel Imager detector and focus stage

39 IFS Layout GMT 2010 Korea - 2010 October 4-6 39 IFS mask wheel IFS anamorphic focal ratio converters IFS filter wheel

40 IFS Layout GMT 2010 Korea - 2010 October 4-6 40 IFS detector and focus stage IFS image slicer IFS pupil mirrors IFS field mirrors IFS collimator IFS grating wheel and steering mirrors

41 Optics – Trimetric View GMT 2010 Korea - 2010 October 4-6 41 Calibration system Calibration feed mirror

42 Calibration Subsystem GMT 2010 Korea - 2010 October 4-6 42 LTAO wave-front sensors GMTIFS calibration system GMTIFS cryostat

43 SYNERGIES GMT 2010 Korea - 2010 October 4-6 43

44 GMT 2010 Korea - 2010 October 4-6 44 JWST Comparison Integral-Field Spectroscopy: GMTIFS will have higher spectral resolution (R = 5000-10000 vs 2700) AND higher spatial resolution (≤ 50 mas vs 100 mas) AND GMTIFS may have lower read noise (??? vs ~ 5 e) GMTIFS will address broader science Imaging: JWST will out-perform GMTIFS for imaging targets with 6.5 m diffraction-limited resolution (85 mas @ K) GMTIFS’s advantage is in observations requiring higher spatial resolution (22 mas @ K) Crowded fields, morphology, size measurement GMTIFS will do different science

45 Summary GMTIFS will be a general-purpose AO instrument for GMT It will address many of the key science drivers for GMT It will be competitive with similar instruments on other ELTs (within certain caveats) It will fully utilize the LTAO capabilities of GMT It may be able to address key science (galaxy evolution) without phasing the seven M1 segments GMT 2010 Korea - 2010 October 4-6 45

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