ALFA Ultra-Deep Survey

Team:Elias Brinks, Noah Brosch, Barbara Catinella,

Christopher Conselice, Jonathan Davies, Erwin de Blok, Virginia Kilborn, Suzanne Linder, Karen Masters, Martin

Meyer, Robert Minchin, Emmanuel Momjian, Karen O'Neil, Daniel Pisano, Jessica Rosenberg, Kristine

Spekkens, Lister Staveley-Smith, Wim van Driel, Martin Zwaan

Strategy: Very long integration time on small patches of sky

Team leader: Wolfram Freudling

AUDS Survey 2

STORRIE-LOMBARDI & WOLFE, 2000, ApJ 543,

552

PEI, FALL, & HAUSER 1999, ApJ, 522, 604

Main Scientific Motivation: Evolution of gas content at z < 0.15

Extrapola

tion fr

om Ly

-α

absorb

ers

Evolutio

n of s

tar-f

ormatio

n

rate

AUDS Survey 3

More Scientific Goals:

The Cosmic Web

Low column-density gas in the local Universe

Extragalactic OH Megamaser Emission

Extragalactic HI Absorption

AUDS Survey 4

Possible survey parameters

Need to be sensitive to MHI~109-10 M

200 km/sec linewidth 0.2mJy at z~0.16 rms~0.05 mJy/beam (260x deeper than HIPASS) 0.36 deg2 in 1000 hrs, or 70 hrs/beam Volume = 8000 Mpc3

160 galaxies in range 109-10 M

AUDS Survey 5

Precursor Proposal to test sensitivity limitations on small region: ___

σTint for long integrations?RFIBaselines, standing wavesEfficiency (time on “source”)

proposal: 70 hours of repeated drift

scans over an area with known gas

rich galaxies within 200Mhz

bandpass