By adding the GBT, phased VLA, Arecibo, and Effelsberg to a VLBA experiment the sensitivity can be increased by an order of magnitude (see figure at left showing sensitivities for a 1 hour integration recording at 256 Mbps). This capability opens up promising new avenues for scientific discovery (e.g., studies of low-power AGN, extragalactic masers, gravitational lenses). The aim of the High Sensitivity Array initiative is to facilitate the planning, scheduling, and calibration of observations making use of this array.

This capability has recently been advertised in an NRAO newsletter article. Proposals will be accepted at NRAO starting with the June 1, 2004 proposal deadline for observing commencing in fall 2004. To qualify for the time set aside for HSA observing the proposals should request 3 of the 5 HSA antennas including the VLBA.

NEW: results from the June 1, 2004 proposal deadline.



Technical information:

Use the EVN sensitivity Calculator to estimate the rms noise. Keep in mind the limitations on transit time for Arecibo of 1-2.75 hours for 0 < declination < 37 degrees (see also The VLBI Guide at Arecibo and The New Users Guide at Arecibo).
Before you schedule your run consult these Tips on using the HSA.
Effelsberg has often been used in conjunction with the VLBA, and is frequency agile at 5 GHz and above. For more information about including Effelsberg with the HSA consult these notes by Richard Porcas.
Here is a Sample Observing Schedule that makes use of the HSA at 8.4 GHz to do phase referencing on a weak Gamma Ray Burst.


Follow these links to the HSA Telescopes:
Link to GBT Link to Arecibo Link to VLA Link to VLBA Link to VLBA
Last modified on Wednesday, 05-Jan-2005 16:11:59 EST by Greg Taylor