Using High Z Clusters as Lenses for Very Faint Source Studies with Chandra

Details Using High Z Clusters as Lenses for Very Faint Source Studies with Chandra Using High Z Clusters as Lenses for Very Faint Source Studies with Chandra

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..711e&link_type=abstract

Chandra Proposal ID #02900649

Physics

Chandra Proposal Id #02900649

Scientific paper

We propose 100ksec ACIS-I observations of two z~0.5 clusters to investigate an striking excess of Chandra sources around them. Gravitational lensing by the clusters may be magnifying very faint [~10(-17)cgs, 0.5-2keV] sources, increasing the Chandra effective area 10-fold. Large scale structure around the clusters, or rapid AGN/starburst evolution are alternatives. These observations will definitively decide between these options. If lensing is correct, then the extra deep imaging it provides will resolve up to 95% of the 2-10keV background, strongly limiting shocks in early structure formation, and testing obscuration models for the XRB. Since optical counterparts are also lensed, source IDs may be feasible at 10(-17) where they would not be in equivalent 1Msec direct imaging.

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