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Add to Calendar 4/17/2019 12:00 pm 4/17/2019 America/Chicago Astrophysics, Gravitation and Cosmology Seminar - " Rare Views of Galaxy Cluster Laboratories" DESCRIPTION:

Galaxy clusters as astronomical tools generally offer two advantages: to boost the brightnesses of objects in the background, and to study the dark matter in the lens.  We can now introduce a third use: to unveil properties of the underlying dark matter by the detection of caustic crossing events which can yield magnification factors of 10,000 or more.  We review the approach to detect a new set of massive objects such as galaxy clusters by their rest-frame far-infrared colors (and not by the Sunyaev-Z'eldovich effect).  We move on to present Hubble Space Telescope WFC3-IR imaging in the fields of six classical giant arcs discovered using a combination of Planck and Herschel space facilities.  We construct lensing models from the many examples of image multiplicities, and compare our results with galaxy over-densities identified by more conventional methods.  We conclude with a discussion on the emerging field of caustic crossings.

\n\nSPEAKER: Brenda Frye, University of Arizona
464 Loomis Lab false

Astrophysics, Gravitation and Cosmology Seminar - " Rare Views of Galaxy Cluster Laboratories"

Speaker Brenda Frye, University of Arizona
Date: 4/17/2019
Time: 12 p.m.
Location: 464 Loomis Lab
Event Contact: Betsy Greifenkamp
greifenk@illinois.edu
Sponsor: Department of Physics
Event Type: Seminar/Symposium
 

Galaxy clusters as astronomical tools generally offer two advantages: to boost the brightnesses of objects in the background, and to study the dark matter in the lens.  We can now introduce a third use: to unveil properties of the underlying dark matter by the detection of caustic crossing events which can yield magnification factors of 10,000 or more.  We review the approach to detect a new set of massive objects such as galaxy clusters by their rest-frame far-infrared colors (and not by the Sunyaev-Z'eldovich effect).  We move on to present Hubble Space Telescope WFC3-IR imaging in the fields of six classical giant arcs discovered using a combination of Planck and Herschel space facilities.  We construct lensing models from the many examples of image multiplicities, and compare our results with galaxy over-densities identified by more conventional methods.  We conclude with a discussion on the emerging field of caustic crossings.

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