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Proposal Identication No.: A1366 Date Received: 1999-Sep-27 16:55:20
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 75 Hours
Proposal Title: 21-cm Observations of Nearby Low Surface Brightness Galaxies: Investigating
the LSB Tully-Fisher Relation
ABSTRACT:
In spite of the diфculty in detecting low surface brightness (LSB) galaxies, it has been well established in
recent years that these diuse systems play a large role both in dening the baryon content of the
universe and our understanding of the distribution of local galaxy types, while also aording a unique
view into star formation and evolution on galactic scales. Yet in spite of their importance, little is
understood about LSB galaxy properties and evolution. Previous studies of LSB galaxies by our group at
Arecibo have greatly expanded our knowledge, including { the detection of the highest MHI /LB galaxies
known; discovery that the reddest LSB galaxies correspond to the highest MHI /LB galaxies, raising
questions about how star formation proceeds in these systems; and extending of the known local galaxy
surface brightness distribution function by one magnitude, to 25.0 B mag arcsec 2 . Although these
results have been encouraging, they are severely limited by the small number of galaxies studied. In
attempt to remedy this, we propose to use the Arecibo Gregorian 305m to search for approximately 120
LSB galaxies which are newly added to our LSB galaxy catalog. To achieve this, we request 75 hours of
night time observations with the L-narrow and L-wide receivers.
Name Institution E-mail Phone Student
Karen L O'Neil Arecibo Observatory koneil@naic.edu (787) 878-2612 no
Instrument Setup
L-wide L-narrow
Atmospheric Optical Instruments:
Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1370 - 1425 (L-narrow)
1260 - 1370 (L-wide)
This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz..
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This proposal requires coordination with GPS L3 at 1381 MHz.
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