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Proposal Identication No.: A1472 Date Received: 2000-Sep-30 15:21:01
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 13 Hours
Proposal Title: Investigating the Star Formation Histories of Low-Luminosity Early-Type Galax-
ies
ABSTRACT:
The hierarchical scenario of galaxy formation predicts that the ages of smaller mass systems should be older than
their larger counterparts. To provide constraints to this model, we have initiated a study of low-luminosity
early-type galaxies in the Virgo cluster. Spectroscopic age diagnostics already indicate that these galaxies have
experienced a large range in star formation histories with 20% of the galaxies in our sample having recent star
formation episodes within the last 2 Gyr. Understanding how these observations constrain models of structure
formation requires information about the star formation histories of these galaxies and the eects of the cluster
environment on their evolution. To determine this, we have intitiated a study which will compare the mean age of
the galaxy's stellar population to the amount of HI available to fuel further star formation episodes. Our desire to
continue our HI observations is the motivation of this observing proposal.
Name Institution E-mail Phone Student
Kristi D Concannon University of North
Carolina at Chapel
Hill
dendy@physics.unc.edu 919-962-3683 G
I might want to do remote observing.
Instrument Setup
L-narrow
Atmospheric Optical Instruments:
Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1