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Proposal Identi cation No.: A Date Received: 2004-Jun-01 18:43:58
Mail hard copies to:
Dr. Sixto Gonzalez, Director
Arecibo Observatory
HC 3 Box 53995
Arecibo, PR 00612 U.S.A.
ARECIBO OBSERVATORY
NATIONAL ASTRONOMY AND
IONOSPHERE CENTER
OBSERVING TIME REQUEST
COVER SHEET
We are indebted to our
user community for their
continued support of
the Arecibo Observatory,
Puerto Rico.
Section I - General Information
Submitted for special 2004.
This proposal has been submitted before, and has been modi ed.
The previous proposal number is Freudling040217.
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 70 Hours
Proposal Title: Precursor Observations for the Alfa Ultra Deep Survey (AUDS)
ABSTRACT:
The improved spatial and spectral survey capabilities available with ALFA will open a new era of high
sensitivity observations for the Arecibo telescope. In principle, it is possible to achieve noise of less than
50 Jy per with integration times of about 100 hours, which translates into a 1 HI mass sensitivity of a
few 10 8 M at a redshift of 0.16. Surveys of such sensitivity could be used to, e.g. investigate the
evolution of HI gas in the universe, directly detect Lyman-limit systems, explore the low-density gas
around the edges of galaxies and search for OH megamasers. Enabling ultra-sensitive observations at
Arecibo would therefore open whole new elds of research to the observatory. In this proposal, we
request observing time for a set of precursor observation to test the feasibility of such very deep ALFA
observations and nd the limitations of such observations. The proposed strategy is to obtain multiple
drift scans over a eld with known late-type disk galaxies close to the redshift limit and close to the
optimal Arecibo declination at night. The total time request is 70 hours of observing time. The target
eld for this precursor proposal includes the low redshift target NGC ~ 7523. The observations will serve as
a technical test for high redshift observations and simultaneously search for extended HI emission around
NGC ~ 7523. If successful, this search will lead to the rst detection of the unionized fraction of the low
column-density hydrogen in emission outside the Local Group.
Name Institution E-mail Phone Student
Wolfram Freudling European Southern
Observatory
wfreudli@eso.org 01149-89-
32006425
no
1

Additional Authors
Elias Brinks Hertfordshire
ebrinks@inaoep.mx
Noah Brosch Wise Obs.
noah@wise.tau.ac.il
Barbara Catinella NAIC
bcatinel@naic.edu
Christopher Conselice Caltech
cc@astro.caltech.edu
Jonathan Davies Cardi
Jonathan.Davies@astro.cf.ac.uk
Erwin de Blok Cardi
Erwin.deBlok@astro.cf.ac.uk
Virginia Kilborn Swinborn
vkilborn@astro.swin.edu.au
Suzanne Linder Cardi
Suzanne.Linder@astro.cf.ac.uk
Karen Masters Cornell
masters@astro.cornell.edu
Martin Meyer STScI
martinm@stsci.edu
Robert Minchin Cardi
Robert.Minchin@astro.cf.ac.uk
Emmanuel Momjian NAIC
emomjian@naic.edu
Karen O'Neil NRAO
koneil@gb.nrao.edu
Daniel Pisano CSIRO
DJ.Pisano@atnf.csiro.au
Jessica Rosenberg U Colerado
jrosenbe@casa.colorado.edu
Kristine Spekkens Cornell
spekkens@astro.cornell.edu
Lister Staveley-Smith CSIRO
Lister.Staveley-Smith@csiro.au
Wim van Driel Meudon
wim.vandriel@obspm.fr
Martin Zwaan ESO mzwaan@eso.org
I will not need nancial support.
This work is not part of a thesis.
Service Observing Request Remote Observing Request
X None No
All of the observing run. X Maybe
Part of the observing run. Yes
Queue Observing
Section II - Time Request
The following times are in AST.
Begin { End Days Needed at
Interval{Interval This Interval
23:45 { 00:45 70
{
{
{
2

Time Constraints (Must Be Justi ed in the Proposal Text)
Section III - Instruments Needed
ALFA
Atmospheric Observation Instruments:
Special Equipment or setup: none
Section IV - RFI Considerations
Frequency Ranges Planned
1220-1420
This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz..
This proposal requires coordination with GPS L3 at 1381 MHz.
Section V - Observing List
Target List
23:12:20 +14:03:41 galaxy eld
3