Journal article

Stars and dark matter in the spiral gravitational lens 2237 0305

CM Trott, T Treu, LVE Koopmans, RL Webster



We construct a mass model for the spiral lens galaxy 2237+0305, at redshift zl = 0.04, based on gravitational-lensing constraints, H i rotation, and new stellar-kinematic information, based on data taken with the Echelle Spectrograph and Imager (ESI) spectrograph on the 10-m Keck-II Telescope. High-resolution rotation curves and velocity dispersion profiles along two perpendicular directions, close to the major and minor axes of the lens galaxy, were obtained by fitting the Mgb-Fe absorption line region. The stellar rotation curve rises slowly and flattens at r ∼ 1.5 arcsec (∼1.1 kpc). The velocity dispersion profile is approximately flat. A combination of photometric, kinematic and lensing ..

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University of Melbourne Researchers


Awarded by David Hay Memorial Fund

Awarded by NSF

Awarded by Packard Foundation

Awarded by Association of Universities for Research in Astronomy, Inc

Funding Acknowledgements

We wish to thank the anonymous referee for improving the manuscript with suggestions that clarify our methodology. CMT acknowledges the support provided by the David Hay Memorial Fund during preparation of this manuscript. LVEK is supported (in part) through an NWO-VIDI program subsidy (project number 639.042.505). TT acknowledges support from the NSF through CAREER award NSF-0642621, by the Sloan Foundation through a Sloan Research Fellowship, and by the Packard Foundation through a Packard Fellowship. Support for HST archival program number 9960 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. We thank Aaron Dutton, Randall Wayth and Phil Marshall for many insightful conversations.