XMM-Newton Snapshots of Unusual Gravitational Lenses

Details XMM-Newton Snapshots of Unusual Gravitational Lenses XMM-Newton Snapshots of Unusual Gravitational Lenses

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..157i&link_type=abstract

XMM-Newton Proposal ID #06737502

Physics

Groups Of Galaxies, Clusters Of Galaxies, Supercluster, Hall'S Lens, Cosmic Horsesho

Scientific paper

We propose XMM-Newton observations of three very unusual strong gravitational lenses discovered in the SDSS. All three lenses appear to be high mass concentration groups/galaxies with extreme properties. Hall's Lens is an optically-unimpressive group for which the derived mass inside the 78 kpc Einstein radius is an astounding >1e14 solar masses. The Cosmic Horseshoe Lens and the Cassowary 20 Lens are giant elliptical galaxies with extremely large stellar velocity dispersions and absolute optical magnitudes, both of which are candidates for the most massive galaxy in the Universe. We propose modest exposures of these intriguing systems to obtain luminosities and temperatures to identify which are worthy of longer follow-up observations.

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