Road Map to the Event Horizon

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Road Map to the Event Horizon
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The Future
Falcke, Melia Agol 2000
Bardeen 1973
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Event Horizon Shadow

• Shadow with radius 5 R_g must exist
• Optically thin emission required
• Polarization suggests tau lt 1 at 1.3 mm
• Sgr A is the only realistic candidate

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Requirements

• Global array
• High frequency receivers antenna performance
• 230/350 GHz
• gt Gigabit recording
• Phase stability
• Water vapor radiometers
• Time standards
• Array Phasing
• Correlator options
• Astrometry/Phase referenced observations
• eVLBI
• Partnership/Organization

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Stations

• CARMA
• ALMA/APEX
• Chile
• New Mexico
• SMA/JCMT/CSO
• HHT
• KP 12m
• LMT
• PdB, PV
• Antartica

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Angular Sizes
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3- or 4-station Image
1.5 Jy
Shadow
Best-fit Gaussian
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Sensitivity
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Maser Performance
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Partners

• UC Berkeley, Stanford, U Washington
• NSF-STC Gravity proposal
• Proposed support for 2 stations
• MIT Haystack
• Recorders, Correlation, Observing Experience
• SAO CfA
• SMA, Masers
• NRAO
• ALMA, Plains of San Augustin, Correlation
• MPIfR
• APEX
• Others
• Arizona, UMASS, INAOE, JIVE

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Organization

• Dedicated experiment?
• Who will participate?
• How to coordinate?
• How many experiments/year?
• Where does the money come from?
• Technical development?

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