Schmidt, Fabian and Leauthaud, Alexie and Massey, Richard and Rhodes, Jason and George, Matthew R. and Koekemoer, Anton M. and Finoguenov, Alexis and Tanaka, Masayuki (2012) A Detection of Weak-lensing Magnification Using Galaxy Sizes and Magnitudes. Astrophysical Journal Letters, 744 (2). L22. ISSN 2041-8205. https://resolver.caltech.edu/CaltechAUTHORS:20120312-110204684
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Abstract
Weak lensing is commonly measured using shear through galaxy ellipticities or using the effect of magnification bias on galaxy number densities. Here, we report on the first detection of weak-lensing magnification with a new, independent technique using the distribution of galaxy sizes and magnitudes. These data come for free in galaxy surveys designed for measuring shear. We present the magnification estimator and apply it to an X-ray-selected sample of galaxy groups in the COSMOS Hubble Space Telescope survey. The measurement of the projected surface density Σ(r) is consistent with the shear measurements within the uncertainties and has roughly 40% of the signal to noise of the latter. We discuss systematic issues and challenges to realizing the potential of this new probe of weak lensing.
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| Additional Information: | © 2012 American Astronomical Society. Received 2011 August 24; accepted 2011 November 17; published 2011 December 19. We thank Jessica Ford, Hendrik Hildebrandt, Bhuvnesh Jain, Donghui Jeong, Eric Jullo, James Taylor, and Ludovic van Waerbeke for helpful discussions. F.S. is supported by the Gordon and Betty Moore Foundation. R.M. is supported by an STFC Advanced Fellowship. J.R. was supported by JPL, run by Caltech for NASA. This work was supported by World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan. | ||||||||||||
| Group: | Moore Center for Theoretical Cosmology and Physics | ||||||||||||
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| Subject Keywords: | dark matter; gravitational lensing: weak; large-scale structure of universe | ||||||||||||
| Issue or Number: | 2 | ||||||||||||
| Record Number: | CaltechAUTHORS:20120312-110204684 | ||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20120312-110204684 | ||||||||||||
| Official Citation: | A Detection of Weak-lensing Magnification Using Galaxy Sizes and Magnitudes Fabian Schmidt et al. 2012 ApJ 744 L22 | ||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
| ID Code: | 29691 | ||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||
| Deposited By: | Jason Perez | ||||||||||||
| Deposited On: | 13 Mar 2012 22:57 | ||||||||||||
| Last Modified: | 26 Nov 2019 01:01 |
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