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ID: 5541.0, MPI für Astrophysik / Cosmology
A conspicuous tangential alignment of galaxies in a STIS parallel Shear Survey field: A new dark-lens candidate?
Authors:Miralles, J. M.; Erben, T.; Hämmerle, H.; Schneider, P.; Fosbury, R. A. E.; Freudling, W.; Pirzkal, N.; Jain, B.; White, S. D. M.
Date of Publication (YYYY-MM-DD):2002-06
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:1
Start Page:68
End Page:73
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We report the serendipituous discovery of a conspicuous alignment of galaxies in a field obtained through the STIS Parallel Shear Survey. This project collects randomly distributed 50" x 50" fields to investigate the cosmic shear effect on this scale. Analyzing the parallel observations having the Seyfert galaxy NGC 625 as primary target, we recognized over the whole field of view a strong apparent tangential alignment of galaxy ellipticities towards the image center. The field shows several arclet-like features typical for images of massive galaxy clusters, but no obvious over- density of bright foreground galaxies. We also find a multiple image candidate. On the basis of the possible strong and weak lensing effect within the data, we discuss whether this could be compatible with a massive halo with no clear optical counterpart.
Free Keywords:gravitational lensing; cosmology : observations; dark matter
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Univ Bonn, Inst Astrophys & Extraterr Forsch, Hugel 71, D-5300; Bonn, Germany; Univ Bonn, Inst Astrophys & Extraterr Forsch, D-5300 Bonn, Germany; European So Observ, ST, EFC, Munich, Germany; Inst Astrophys Paris, Paris, France; DEMIRM, Observ Paris, F-75014 Paris, France; Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA; Max Planck Inst Astrophys, Munich, Germany
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