NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Environmental Effects on the Metallicities of Early-Type GalaxiesWe have completed and published two papers based on research from this grant. Our first paper "SN IA Enrichment in Virgo Early-type Galaxies from ROSAT and ASCA Observations" was published in the Astrophysical Journal (vol 539,603) reported on the properties of nine X-ray bright elliptical galaxies in the Virgo cluster observed by ROSAT and ASCA. We measured iron abundance gradients as a function of radius in three galaxies. We found that the magnesium and silicon abundance gradients were in general flatter than those of iron. We suggest this is due to a metallicity dependence in the metal production rates of SN Ia's. We calculate SN Ia rates in the center of these galaxies that are comparable to those measured optically. Our second paper "ASCA Observations of Groups at Radii of Low Overdensity: Implications for Cosmic Preheating" also was published in the Astrophysical Journal (vol 578, 74). This paper reported on the ASCA spectroscopy of nine groups of galaxies. We found that the entropy profile in groups is driven by nongravitational heating processes, and could be explained by a short period of preheating by galactic winds.
Document ID
20030018256
Acquisition Source
Goddard Space Flight Center
Document Type
Contractor or Grantee Report
Authors
Jones, Christine
(Smithsonian Astrophysical Observatory Cambridge, MA United States)
Oliversen, Ronald J.
Date Acquired
August 21, 2013
Publication Date
February 1, 2003
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-9096
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available