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Proposal Identification No.: A1904 Date Received: 2004­Jan­27 09:55:22
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 40 Hours
Proposal Title: HI Observations of Dwarf Galaxy Candidates in the Leo I Group Region
ABSTRACT:
The Leo I group is a nearby density enhancement characterized by a low velocity dispersion but containing a local
density enhancement that supports the presence of bright E/SO galaxies. It thus presents an interesting
environment in which to study di#erences among the low luminosity dwarf populations. We propose to conduct HI
line observations of a set of dwarf galaxies believed to be group members identified in a wide area (120 square
degree) survey of the area of sky containing Leo I. In addition to verifying their group membership, the
observations will determine the HI content and rotation velocity and thus help to reveal further their relation to
group substructures. In combination with future E­ALFA survey results, these observations will allow an
understanding of the correspondence of optical and HI selection among the lowest mass objects in this particularly
interesting volume of the local universe.
Name Institution E­mail Phone Student
Martha P. Haynes Cornell University haynes@astro.cornell.edu 607/255­0610 no
Service Observing Request Remot e Observing Request
X None No
All of the observing run. X Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
L­wide
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
1

Frequency Ranges Planned
1370­1430
This proposal requires coordination with Punta Salinas radar within the band 1222­1381 MHz..
This proposal requires coordination with GPS L3 at 1381 MHz.
2