Chandra Imaging of NGC 922 -- the closest collisional ring galaxy
Abstract
Ultra Luminous X-ray sources {ULX} have luminosities many times the Eddingtonlimit for a stellar black hole and are associated with massive star formation.This is illustrated by the Chandra image of the Cartwheel, a collisional ringgalaxy. The bulk of the X-ray luminosity is produced by 16 ULX co-incidentwith the outer ring of star formation. We request Chandra and HST time to imageanother collisional ring galaxy NGC 922. NGC 922 is similar to the Cartwheel,except that it is nearly three times closer and has higher metallicity. We will{1} detect fainter sources than was possible for the Cartwheel, {2} use archivalHST data and our new Halpha images to associate X-ray sources with tracers ofstar formation and {3} study the effect of metallicity on the formation of ULX.
- Publication:
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HST Proposal
- Pub Date:
- July 2009
- Bibcode:
- 2009hst..prop11836P