East Asia Observatory James Clerk Maxwell Telescope and VLBI Per - - PowerPoint PPT Presentation

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Jan 26, 2023 281 likes •432 views

East Asia Observatory James Clerk Maxwell Telescope and VLBI Per Friberg EAO/JCMT EAVW 2018 Yong Pyong Korea JCMT Location Maunakea, Hawaii Altitude 4100 m 15 m dish Surface accuracy 25 m Operating up to 800 GHz EAVW 2018 Yong Pyong

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EAVW 2018 Yong Pyong Korea

East Asia Observatory James Clerk Maxwell Telescope and VLBI

Per Friberg EAO/JCMT

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EAVW 2018 Yong Pyong Korea

JCMT

Location Maunakea, Hawaii Altitude 4100 m 15 m dish Surface accuracy 25 µm Operating up to 800 GHz

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EAVW 2018 Yong Pyong Korea

Opacity

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EAVW 2018 Yong Pyong Korea

Observing Conditions

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EAVW 2018 Yong Pyong Korea

SCUBA-2

10000 pixels 2 focal planes 850 & 450 µm TES Detectors cold to ~70 mK

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EAVW 2018 Yong Pyong Korea

Cosmology Legacy Survey Galactic Plane Survey

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EAVW 2018 Yong Pyong Korea

POL-2 Large scale mapping

Pilars of creation Eagle Nebula Pattle & Bistro team Model Observations SgrA* magnetic field (Pei-Ying Hsieh et.al.)

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EAVW 2018 Yong Pyong Korea

HARP 16 pixel heterodyne array 325 - 375 GHz OMC1 CO 3-2 (346 GHz) Galactic Plane Survy

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EAVW 2018 Yong Pyong Korea

Interferometry at the JCMT

VLBI attempt January 1992 Short Baseline Interferometer JCMT & CSO eSMA - extended SMA with JCMT & CSO eSMA made it possible to do VLBI with the JCMT using the hydrogen maser and recoding equipment at the SMA

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EAVW 2018 Yong Pyong Korea

2007 First detection of structure on the event horizon size scale in SgrA* Stations JCMT (SMA), SMT & CARMA Solid line - Gaussian model Dotted line “shadow” model

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EAVW 2018 Yong Pyong Korea

Development

GLT receiver testing at JCMT

86, 230 and 345 GHz 230 GHz ALMA band 6 mixers (2Pol,2SB) 345 GHz ALMA band 7 mixers (2Pol,2SB) 86 GHz band 3 (2Pol) Aiming to be ready for EHT VLBI run in 2019 Copy of the GLT receiver under construction at ASIAA.

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EAVW 2018 Yong Pyong Korea

Development Recording System

By April 2019 we expect to have 2 BDC, 4 r2dbe and 4 Mark-6 recorders supporting 64 Gpbs/s Mark6 R2DBE

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EAVW 2018 Yong Pyong Korea

VLBI Development Work

Frequency references will still be referred to the SMA/ ASIAA Hydrogen maser. Transferring 10 MHz & high frequency references via temperature stable fibers. We still need to use borrowed components to operate the system. For VLBI system test we have performed local fringe test with the SMA. This is not practical for observations without SMA participation (e.g. non EHT observations). We need to build up capability for stand alone stability test.