Millimeter-VLBI: Difference between revisions

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The unprecedented sensitivity, broad frequency coverage, and unique location of ALMA will have the potential to transform the science that can be done with mm-VLBI. With expected spatial resolutions as low as some microarcseconds at the highest frequencies and mJy sensitivities at the lower frequencies, quite a range of high-profile experiments should be possible. The science that can be addressed ranges from the precise astrometry and study of stellar masers down to observations of jets and the event horizon of supermassive black holes.
The huge potential of VLBI at submm/mm wavelengths is that it enables the highest resolution imaging currently possible at any wavelength in astronomy. Using ALMA as a phased array to form part of a global VLBI network will offer unprecedented sensitivity at very high angular resolution, making one order of magnitude weaker sources accessible to μas-resolution studies and greatly improving image fidelity for the brighter objects . Moreover, it will allow the shadow of a black hole,  test of general relativity near black holes, investigate jet launch and collimation from AGN and microquasars, pulsar and magnetar emission processes, the chemical history of the universe and the evolution of fundamental constants across cosmic time, maser science, and astrometry.


'''White paper'''
 
'''Status'''
 
VLBI inherently requires many telescopes to operate together.  Existing activities at 3 mm (the Very Long Baseline Array and the Global Millimeter VLBI Array) and at 1 mm (the Event Horizon Telescope project) have laid the ground work for future coordinated observations. An international consortium is presently constructing a beamformer for the ALMA  that will be available as a facility instrument providing substantial improvements to existing VLBI arrays in Bands 1 and 3 (7 and 3 mm).
 
'''Nov 2012''': the Alma Phasing Project has successfully passed its preliminary design review.
 
'''2015''':  initial ALMA phasing tests are expected.
 
'''White papers'''


''High-Angular-Resolution and High-Sensitivity Science Enabled by Beamformed ALMA'', Fish et al. 2013, arXiv:1309.3519.
''High-Angular-Resolution and High-Sensitivity Science Enabled by Beamformed ALMA'', Fish et al. 2013, arXiv:1309.3519.


http://adsabs.harvard.edu/abs/2013arXiv1309.3519F
http://adsabs.harvard.edu/abs/2013arXiv1309.3519F
''mm-VLBI and Beam-formed Science with ALMA:European Science Interests'', Editorial Board: A. Zensus, A. Baudry, M. Bremer, J. Conway, H. Falcke, G. Giovannini, T. Kr ichbaum, R. Laing, H. J. Van Langevelde, R. Tilanus, Sept. 2013 presented at ESAC.
'''ESO Upgrade Proposal'''
''Phased ALMA as an Element of the Global Millimetre VLBI Array'', August 2013


'''The Global Millimeter Array (GMVA)'''
'''The Global Millimeter Array (GMVA)'''

Revision as of 17:37, 12 May 2014

The huge potential of VLBI at submm/mm wavelengths is that it enables the highest resolution imaging currently possible at any wavelength in astronomy. Using ALMA as a phased array to form part of a global VLBI network will offer unprecedented sensitivity at very high angular resolution, making one order of magnitude weaker sources accessible to μas-resolution studies and greatly improving image fidelity for the brighter objects . Moreover, it will allow the shadow of a black hole, test of general relativity near black holes, investigate jet launch and collimation from AGN and microquasars, pulsar and magnetar emission processes, the chemical history of the universe and the evolution of fundamental constants across cosmic time, maser science, and astrometry.


Status

VLBI inherently requires many telescopes to operate together. Existing activities at 3 mm (the Very Long Baseline Array and the Global Millimeter VLBI Array) and at 1 mm (the Event Horizon Telescope project) have laid the ground work for future coordinated observations. An international consortium is presently constructing a beamformer for the ALMA that will be available as a facility instrument providing substantial improvements to existing VLBI arrays in Bands 1 and 3 (7 and 3 mm).

Nov 2012: the Alma Phasing Project has successfully passed its preliminary design review.

2015: initial ALMA phasing tests are expected.

White papers

High-Angular-Resolution and High-Sensitivity Science Enabled by Beamformed ALMA, Fish et al. 2013, arXiv:1309.3519.

http://adsabs.harvard.edu/abs/2013arXiv1309.3519F

mm-VLBI and Beam-formed Science with ALMA:European Science Interests, Editorial Board: A. Zensus, A. Baudry, M. Bremer, J. Conway, H. Falcke, G. Giovannini, T. Kr ichbaum, R. Laing, H. J. Van Langevelde, R. Tilanus, Sept. 2013 presented at ESAC.

ESO Upgrade Proposal

Phased ALMA as an Element of the Global Millimetre VLBI Array, August 2013

The Global Millimeter Array (GMVA)

http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/

Event Horizon Telescope

http://www.eventhorizontelescope.org/

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