Murrieta Valley Unified School District / Overview...Author: rray Created Date: 9/22/2017 2:48:07 PM
CARMA C ombined A rray for R esearch in M illimeter-wave A stronomy
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Transcript of CARMA C ombined A rray for R esearch in M illimeter-wave A stronomy
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CARMA Combined Array for Research in
Millimeter-wave Astronomy
Stuart VogelALMA Workshop– May2004
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OVRO
BIMA
CaltechSix 10.4 m dishes
Berkeley – Illinois – MarylandNine 6.1 m dishes
ChicagoEight 3.5 m dishes
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Rick Forster
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Inyo National ForestCedar Flat – 7300’
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Timeline
• Cedar Flat permit• Shut down BIMA & OVRO• Roads, pads, buildings• Move BIMA & OVRO• First light & Operations
2003 December
2004 June
2004 Summer
2004 Fall
2005 Fall
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BIMA Relocation
OVRO Relocation
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D Array + SZA
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SZA
• Carlstrom – Chicago
• Built to CARMA standard
• Eight x 3.5 m dishes
• 30 – 90 – 230 GHz
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+3.5 m SZA
10.4 m OVRO 6.1 m BIMAD Array
Heterogeneous Array
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D 1.9” @1mm
Cedar Flat: View from South15 OVRO & BIMA dishes; SZA not shown
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C 0.8” @1mm
Cedar Flat: View from South15 OVRO & BIMA dishes; SZA not shown
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B 0.3” @1mm
Cedar Flat: View from South15 OVRO & BIMA dishes; SZA not shown
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A 0.12” @1mm
Cedar Flat: View from South15 OVRO & BIMA dishes; SZA not shown
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Transporter
Antenna Transporter
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OVROCedar FlatJuniper Flat
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100 GHz 230 GHz
Array Beam 1-min 5-hr Beam 1-min 5-hr
D 6.3” 0.3 K 0.02 K 2.7” 0.4 K 0.02 K
C 2.5” 2.0 K 0.1 K 1.1” 2.2 K 0.13 K
B 1.0” 12 K 0.7 K 0.4” 17 K 1.0 K
A 0.4” 77 K 4.5 K 0.2” 67 K 4 K
Line: 1 km/sec
100 GHz 230 GHz
1-min 5-hr 1-min 5-hr
0.7 mJy 0.04 mJy 1.1 mJy 0.07 mJy
CARMA Sensitivity
Continuum
Factor of 5 to 20 better
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Caltech COBRA correlator
• FPGAs, not custom correlator chips
• 4 GHz bandwidth
• 256 20 Mhz channels
• 6 station
For CARMA
• Reprogram FPGAs
• Spectral downconverters
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CARMA Correlators
8 antennas8 GHz256 channels
15 antennas4 GHz8 x 2– 500MHz tunable bands64 – 512 channels
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Other CARMA Development
• New LO/IF system HEMT/SIS/MMIC
• New computing system + reuse
• Upgrade antenna drives, cryogenics, telemetry
• Post first-light: single-dish, polarization, WVR
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Large bandwidth, high sensitivity
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QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
•Multiply-imaged SMM1-A2218
• CO (3-2) from z=2.5165
• All three lensed images seen
• ∫Sco v ~ 5.4 Jy km/s (0.8, 3.1, 1.4)
• v ~ 530 km/s
• Unlensed CO mass ~ 6 x 109 M
• No offset between optical and CO
• SFR ~ 100-500 solar masses/yr
• Could be a circumnuclear ring (velocity structure) ?
• Witnessing a circumnuclear starburst w/ lifetime ~ 107 years?
Sheth, Blain, Kneib & Frayer ‘04
z=2.52
High resolutionHigh sensitivity
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High resolutionHigh sensitivity
2 km baselines – 0.12” @1mm
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Horsehead
29 fields
CO 1-0Pound et al
2003
Heterogeneous imaging, mosaics
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Swift 2004
Heterogeneous imaging, mosaics
L1551C18O220 fields
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Swift 2004
Heterogeneous imaging, mosaics
L155113CO220 fields
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H: Cheng et al. (1993)
M33 in H
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BIMA M33 GMC Survey
• CO 1-0• 759 mosaic fields• 135 total hours• 10 minutes per field
CO: Engargiola et al. (2003)
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GMCs in M33• 148 GMCs• Complete to
1.5 x 105 Msun
• Mass spectrum: dN/dM
• Characteristic mass: 7 x 104 Msun
• Nearly all HII regions near GMCs
CO: Engargiola et al. (2003)
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Correlation with HI
• In M33, GMCs form from HI with N(HI)>5x1020
cm-2
HI: Deul & van der Hulst (1987)
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Andromeda
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CO
R
H
BIMA SONG
NGC 2903 NGC 3627 NGC 3953 NGC 4303Barred galaxies
Central kpc
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CO
R
H
BIMA SONG
NGC 4321 NGC 4535 NGC 5457 NGC 6946Barred galaxies
Central kpc
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CO
R
H
BIMA SONG
NGC 0628 NGC 3938 NGC 4414 NGC 4736Unbarred galaxies
Central kpc
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CO
R
H
BIMA SONG
NGC 4826 NGC 5055 NGC 5194 NGC 7331Unbarred galaxies
Central kpc
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Secular Evolution
Nuc
(Mo pc-2)
Disk (Mo pc-2)
Early Barred
Early Unbarred
Late Barred
Late Unbarred
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Secular Evolution
Nuc
(Mo pc-2)
Disk (Mo pc-2)
Early Barred
Early Unbarred
Exclude inner ring galaxies
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Sunyaev-Zel’dovich Effect
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CARMA
• Best array at 1 & 3 mm for resolution, sensitivity, fidelity, & bandwidth (until ALMA up to speed)
• Northern hemisphere complement to ALMA (and Spitzer, SOFIA, JWST, etc)
• Heterogeneous mosaics, surveys• Development (WVR, focal plane arrays)• Hands-on student & postdoc training• Building the mm-wave community
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