a Possible New Distance Indicator Using Low Mass X-Ray Binaries in the Nearest Early-Type Galaxies

Details a Possible New Distance Indicator Using Low Mass X-Ray Binaries in the Nearest Early-Type Galaxies a Possible New Distance Indicator Using Low Mass X-Ray Binaries in the Nearest Early-Type Galaxies

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop..892i&link_type=abstract

Chandra Proposal ID #03600627

Physics

Chandra Proposal Id #03600627

Scientific paper

Initial work with Chandra data of early-type systems indicates that the amount of X-ray luminosity coming from LMXBs with luminosities below 10^38 ergs/s appears to be constant from galaxy to galaxy once it is normalized by the optical luminosity of the galaxy. If this is a general feature of galaxies it can be used as a distance indicator to galaxies. A statistical analysis shows that this method might be accurate to as little as 5%. We propose to observe four very nearby early-type galaxies with accurately known distances with ACIS-S to confirm that this method of distance determination is valid and can be used on more distant galaxies. We will also detect any hot gas in these systems, and measure its luminosity, temperature and metallicity.

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