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Дата индексирования: Sat Dec 22 20:35:17 2007
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A1633 2002-Feb-01 17:59:03
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 36 Hours
Proposal Title: The E ect of the Cluster Environment on Galaxy Evolution in the Pegasus I
Cluster
ABSTRACT:
The Pegasus cluster o ers a most unusual environment in which to study the star formation histories of its
members. Several galaxies exhibit signs of recently completed or ongoing star formation, although what triggered
these episodes is not clear. Two galaxies are of special signi cance. Ground-based imaging has shown NGC7648
to have morphological features characteristic of a tidal interaction. NGC7604 has an o set region of enhanced
Halpha emission, and a faint arc, typical of a galaxy a ected by ram pressure sweeping. This is surprising, since
Pegasus is considered an environment where ram pressure stripping should not be operating. In addition, there
are con icting claims for HI depletion in other Pegasus spirals. We propose that Arecibo observations of the HI
content and its distribution within these two galaxies, as well as in other spiral galaxies in Pegasus, will help
clarify how the cluster environment is a ecting the evolution of its member galaxies.
Name Institution E-mail Phone Student
James A Rose University of North
Carolina at Chapel
Hill
jim@physics.unc.edu 919-962-7170 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
L-narrow
Atmospheric Observation Instruments:
Special Equipment or setup: none
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RFI Considerations
Frequency Ranges Planned
1381-1405
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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