EVLA Sensitivity & Survey Speed

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Presentation transcript:

EVLA Sensitivity & Survey Speed Michael P. Rupen May 22/23 2007 SAGE Meeting

Sensitivity in 12 hours Green shows deepest image ever made (as of 1999) -- 1.9 microJy/bm at 8.5 GHz (152 hrs; Richards et al.) -- 3 hours with the EVLA! May 22/23 2007 SAGE Meeting

Point source sensitivity in 2min/12hrs May 22/23 2007 SAGE Meeting

Surface brightness sensitivity in 2min/12hrs May 22/23 2007 SAGE Meeting

Number of background sources in 12 hours Number of background sources in the primary beam in a 12-hour integration May 22/23 2007 SAGE Meeting

Survey Speed I Time to observe 1 square degree to 40 microJy/beam rms doesn’t include overhead (--> x1.5, from NVSS) Rms chosen to ensure at least 20s/ptg (NVSS: 30s with 23.3s on-source) Note uv-coverage issues Assumes no overlap May 22/23 2007 SAGE Meeting

Survey Speed II Square degrees observed per hour as a function of frequency, to an rms of 40 microJy/bm Assumptions as in last slide May 22/23 2007 SAGE Meeting