Over-Luminous Elliptical Galaxies (aka Fossil Groups)

Details Over-Luminous Elliptical Galaxies (aka Fossil Groups) Over-Luminous Elliptical Galaxies (aka Fossil Groups)

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop..985f&link_type=abstract

Chandra Proposal ID #03800130

Physics

Chandra Proposal Id #03800130

Scientific paper

Recent studies identified a new class of groups in which most of the optical light arises from a single, dominant elliptical and yet the X-ray gas has an extent and luminosity characteristic of a bright galaxy group. These systems may be ``fossil'' groups in which the member galaxies have merged into a single galaxy. We propose to observe two low redshift, X-ray bright members of this class, ESO5520200 and NGC4936. We will determine baryon fractions, mass-to-light ratios, and mass and abundance distributions to test if these systems are either ``fossil'' groups or a new optically ``dim'' class. By studying sharp surface brightness ``edges'', Chandra's high angular resolution will allow us to catch galaxies in the act of merging and measure gas motions and magnetic field strengths.

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