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Дата изменения: Mon Apr 19 19:59:32 2004
Дата индексирования: Sat Dec 22 21:57:00 2007
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Поисковые слова: california nebula

Proposal Identication No.: A1400 Date Received: 2000-Feb-01 15:08:18
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 60 Hours
Proposal Title: Determining the z< 0.1 Baryon Budget
ABSTRACT:
Due to considerable uncertainty in the high end of the scale length distribution for low surface brightness galaxies,
the contribution of these galaxies to the baryon density in the local universe is currently a matter of debate.
Studies of intragalactic gas indicate at least 60% of the local baryons predicted by nucleosynthesis theories reside in
plasmas, while recent studies of the number density of galaxies indicate 70% of the local baryons reside in diuse,
low surface brightness systems. Clearly something is wrong. To determine the validity of the second claim, that a
signicant fraction of the predicted baryons lie in low surface brightness systems, we propose to perform a 21-cm
search for 60 previously undetected, yet presumably H I rich, galaxies in the z = 0.02 { 0.1 range to determine the
contribution of diuse galaxies to the local luminosity function. As preliminary studies gave a 86% detection rate
with only 1 hour of telescope time/galaxy, we request 60 hours of observing time with the L-wide receiver, spread
over 2 { 3 observing sessions.
Name Institution E-mail Phone Student
Karen L O'Neil Arecibo Observatory koneil@naic.edu 787 878 2612,
x326
no
Instrument Setup
L-wide
Atmospheric Optical Instruments:
Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1222 - 1422
This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz..
This proposal requires coordination with GPS L3 at 1381 MHz.
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