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Proposal Identification No.:

A1915

Date Received:

2004-Jan-30 19:15:42

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: Regular Astronomy Spectroscopy Extragalactic 4.0 Hours

The Effect of Cluster Environment on Galaxy Evolution in the Core Pegasus I

Cluster.
ABSTRACT:
The Pegasus cluster offers a most unusual environment in which to study the star formation histories of its memb ers. Several galaxies exhibit signs of HI deficiency, indicative of ongoing ram pressure effects. This is surprising, since Pegasus is considered an environment where ram pressure stripping should not b e op erating. We have previously obtained HI profiles of 48 galaxies with the Arecib o telescop e. Here we prop ose Arecib o observations of the HI content of 9 more galaxies, to create a complete sample of the spiral galaxies withinin 1 R A in the core Pegasus I cluster. These observations will help clarify how the cluster environment is affecting the evolution of its memb er galaxies.

Name James A. Rose

Institution University of North Carolina at Chapel Hill

E-mail jim@physics.unc.edu

Phone 919-962-7170

Student no

Service Observing Request

Remot e Observing Request

None X All of the observing run. Part of the observing run. Queue Observing X

No Maybe Yes

Instrument Setup
L-narrow Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned
1400-1420

2