Journal article
Galaxy-Galaxy Flexion: Weak Lensing to Second Order
The Astrophysical journal, v 619(2 I), pp 741-748
16 Jun 2004
Abstract
Astrophys.J. 619 (2005) 741-748 In this paper, we develop a new gravitational lensing inversion technique.
While traditional approaches assume that the lensing field varies little across
a galaxy image, we note that this variation in the field can give rise to a
``Flexion'' or bending of a galaxy image, which may then be used to detect a
lensing signal with increased signal to noise. Since the significance of the
Flexion signal increases on small scales, this is ideally suited to
galaxy-galaxy lensing. We develop an inversion technique based on the
``Shapelets'' formalism of Refregier (2003). We then demonstrate the proof of
this concept by measuring a Flexion signal in the Deep Lens Survey. Assuming an
intrinsically isothermal distribution, we find from the Flexion signal alone a
velocity width of v_c=221\pm 12 km/s for lens galaxies of r < 21.5, subject to
uncertainties in the intrinsic Flexion distribution.
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Details
- Title
- Galaxy-Galaxy Flexion: Weak Lensing to Second Order
- Creators
- David M Goldberg - Drexel UniversityDavid J Bacon - Institute for Astronomy, School of Physics, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
- Publication Details
- The Astrophysical journal, v 619(2 I), pp 741-748
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000226589100008
- Scopus ID
- 2-s2.0-17044364815
- Other Identifier
- 991019168542304721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics