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A1634 2002-Feb-01 20:19:52
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 36 Hours
Proposal Title: The LGS 3 Field: Resolving a Possible HVC-Dwarf Spheroidal Interaction
ABSTRACT:
We have used Arecibo (A1340) to observe a previously unresolved HI cloud near LGS 3 and determined it is
actually a high-velocity cloud (HVC) separate from the dwarf galaxy. The HVC is rotating, dark
matter-dominated, and appears to be tidally interacting with LGS 3. This interaction is the best evidence to date
for a  1 Mpc distance to an HVC. However, the tidal features are weak and diфcult to distinguish from spectral
standing wave features. We request additional observations of the LGS 3 eld for two purposes. First, we would like
to double the signal-to-noise ratio so that we will be able to denitively model this interacting system. Second, we
have developed a routine to remove the standing waves, but it requires a larger RA extent than is present in our
previous observations in order to function optimally.
Name Institution E-mail Phone Student
Timothy Robishaw UC Berkeley robishaw@astro.berkeley.edu (510) 643-6425 G
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
L-narrow
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1