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Gravitational shear, flexion, and strong lensing in Abell 1689

Leonard, Adrienne and Goldberg, David M. and Haaga, Jason L. and Massey, Richard (2007) Gravitational shear, flexion, and strong lensing in Abell 1689. Astrophysical Journal, 666 (1). pp. 51-63. ISSN 0004-637X. doi:10.1086/520109.

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We present a gravitational lensing analysis of the galaxy cluster Abell 1689, incorporating measurements of the weak shear, flexion, and strong lensing induced in background galaxies. This is the first time that a shapelet technique has been used to reconstruct the distribution of mass in this cluster and the first time that a flexion signal has been measured using cluster members as lenses. From weak shear measurements alone, we generate a nonparametric mass reconstruction, which shows significant substructure corresponding to groups of galaxies within the cluster. In addition, our galaxy-galaxy flexion signal demonstrates that the cluster galaxies can be well fit by a singular isothermal sphere model with a characteristic velocity dispersion of σv = (295 ± 40) km s^(-1). We identify a major, distinct dark matter clump, offset by 40 h^(-1) kpc from the central cluster members, which was not apparent from shear measurements alone. This secondary clump is present in a parametric mass reconstruction using flexion data alone, and its existence is suggested in a nonparametric reconstruction of the cluster using a combination of strong and weak lensing. As found in previous studies, the mass profile obtained by combining weak and strong lensing data shows a much steeper profile than that obtained from only weak lensing data.

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Additional Information:© 2007 The American Astronomical Society. Received 2007 February 8; accepted 2007 May 25. The authors would like to thank David Bacon, Sanghamitra Deb, John Parejko, Lindsay King, and Marceau Limousin for useful discussions. This work was supported by NASA ATP NNG 05-GF61G and HST Archival grant 10658.01-A. A. L. is supported by a BP/PPARC Dorothy Hodgkin Postgraduate Award.
Funding AgencyGrant Number
NASA Aeronautics Test Program (ATP)NNG 05-GF61G
Hubble Space Telescope Archival grant10658.01-A
Subject Keywords:cosmology: observations; galaxies: clusters: general; galaxies: photometry; gravitational lensing
Issue or Number:1
Record Number:CaltechAUTHORS:LEOapj07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13765
Deposited By: Tony Diaz
Deposited On:14 Jul 2009 20:30
Last Modified:08 Nov 2021 22:40

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