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The Expanded VLA Project
VLA Expansion Project

The Expanded VLA Project:
A Radio Telescope to Resolve Cosmic Evolution
Phase II


  • EVLA Phase II Proposal

  • Key Science Examples
    Capabilities Technical Advances

    EVLA Phase II - Key Science Examples

  • AU-scale imaging of local star forming regions and proto-planetary disks
  • Resolving the dusty cores of galaxies to distinguish star formation from black hole accretion
  • Imaging at the highest resolution at any wavelength of the earliest galaxies (z~30)
  • Imaging of galaxy clusters with 50 kpc or better resolutions at arbitrary redshifts
  • Imaging of thermal sources at milliarcsecond scales
  • Resolving individual compact HII regions and supernova remnants in external galaxies as distant as M82
  • Tying together the optical and radio reference frames with sub-milliarcsecond precision
  • Measuring accurate parallax distances and proper motions for hundreds of pulsars as distant as the Galactic Center
  • Providing 50 pc or better resolution for galaxies at any redshift
  • Monitoring and imaging the full evolution of the radio emission associated with X-ray and other transients

  • View of the VLBA antenna at Pie Town, New

    EVLA Phase II - Capabilities

    Angular resolution improvement by an order of magnitude (better than 10 mas at 18 to 50 GHz), providing tens of Kelvin brightness temperature sensitivity.

    Fast, high fidelity imaging of low-brightness (~10 microKelvin) emission with tens of arcseconds angular resolution of objects whose extent exceeds the antenna primary beam.

    Phase II - Technical Advances

  • Eight new antennas, providing baselines up to 350 km
  • Modification of Pie Town and Los Alamos VLBA antennas for full compatibility
  • Connection of the new and upgraded antennas to the WIDAR correlator by fiber-optic lines
  • Construction of compact E configuration, providing baselines from 30 to 250 meters
  • Real-time correlation of the new and upgraded antennas with the other 27 using the WIDAR correlator
  • Implementation of WIDAR design to allow correlation of disk recorded data from VLBA antennas with real-time data
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