1 / 7

Gravitational Lensing Distorts Counts of Very High Redshift Galaxies

Gravitational Lensing Distorts Counts of Very High Redshift Galaxies. Stuart Wyithe (Univ. Melbourne), Haojing Yan (Ohio State Univ.), Rogier Windhorst (Arizona State Unv.), Shude Mao (Univ. Manchester & NAOC, China) (Based on Publication in Nature, Jan 12, 2011)

ham
Download Presentation

Gravitational Lensing Distorts Counts of Very High Redshift Galaxies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Gravitational Lensing Distorts Counts of Very High Redshift Galaxies • Stuart Wyithe (Univ. Melbourne), Haojing Yan (Ohio State Univ.), Rogier Windhorst (Arizona State Unv.), Shude Mao (Univ. Manchester & NAOC, China) • (Based on Publication in Nature, Jan 12, 2011) • AAS 217th Meeting, Seattle, WA • January 12, 2011

  2. Gravitational Lensing Is Well Known (1990) (1996) (2005) Lensing of background objects by foreground galaxy clusters Lensing of background objects by individual foreground galaxies

  3. Implication for High-redshift Studies Yet to Be Fully Explored • Gravitational lensing by individual foreground galaxies amplifies background high-redshift galaxies • It happens more often than we used to think • The effect manifests itself by concentration of high-redshift galaxies around foreground galaxies Credit: NASA, ESA, Z. Levay and A. Feild (STScI)

  4. High Lensing Rate at Very High Redshifts: Initial Evidence Hubble Ultra Deep Field Image, Optical + IR

  5. About 20% of candidate galaxies at redshifts ~ 8 - 10 are found to be very close to foreground galaxies, consistent with our prediction

  6. Y-band “dropouts”: candidate galaxies at redshifts ~ 8 J-band “dropouts”: candidate galaxies at redshifts ~ 10 Red Band Blue Band

  7. Why This Is Important • Bright distribution of galaxies at very high redshifts is crucial to our understanding of how the universe was forming galaxies in its infancy • High incidence of lensing implies that there are many very faint galaxies at these very high redshifts

More Related