|
iDEA: Drexel E-repository and Archives >
Drexel Academic Community >
College of Arts and Sciences >
Department of Physics >
Faculty Research and Publications (Physics) >
Galaxy-galaxy Flexion: weak lensing to second order
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1860/1923
|
| Title: | Galaxy-galaxy Flexion: weak lensing to second order |
| Authors: | Goldberg, David
Bacon, David |
| Keywords: | Galaxies: Halos
Galaxies: Structure
Gravitational Lensing |
| Issue Date: | 26-Nov-2007 |
| Publisher: | American Astronomical Society |
| Citation: | The Astrophysical Journal, 619: pp. 741-748. |
| Abstract: | 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 vc = 221±12km/s for lens galaxies of r < 21.5, subject
to uncertainties in the intrinsic Flexion distribution. |
| URI: | http://arxiv.org/abs/astro-ph/0406376v2
http://hdl.handle.net/1860/1923 |
| Appears in Collections: | Faculty Research and Publications (Physics)
|
Items in iDEA are protected by copyright, with all rights reserved, unless otherwise indicated.
|
www.drexel.edu
