Chandra Constraints for Q0957+561 Lens Models

Details Chandra Constraints for Q0957+561 Lens Models Chandra Constraints for Q0957+561 Lens Models

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19710407c&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #104.07; Bulletin of the American Astronomical Society, Vol. 32, p.1577

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the detection of the cluster lens of the gravitational lens (GL) system Q0957+561 from a deep Chandra ACIS observation. Extended X-ray emission is found to be centered NE of image B. Its spectrum can be modeled well with a thermal plasma model consistent with the emission originating from a cluster at a redshift of 0.36. Our best fit estimates of the cluster temperature of ~ 3 keV and mass distribution of the cluster are used to derive the convergence parameter κ , the ratio of the cluster surface mass density to the critical density required for lensing. The observed cluster center, mass distribution and convergence parameter κ provide additional constraints to lens models for this system. Our new results break a sheet-mass degeneracy in GL models of this system and provide better constraints on the Hubble constant.

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