Dr. Hendrik Hildebrandt
Argelander-Institut für Astronomie, Bonn
KiDS+VIKING: Improved cosmological constraints from cosmic shear tomography with optical+infrared data
Abstract:
Cosmic shear tomography yields cosmological insights complementary to other probes like the cosmic microwave background (CMB). Ongoing wide-field imaging surveys exploit this to come up with competitive constraints on important cosmological parameters like the matter density and the amplitude of the matter power spectrum. In this talk I will concentrate on recent results from the ongoing European KiDS (Kilo Degree Survey) and VIKING (VISTA Kilo Degree Infrared Galaxy Survey) projects. This unique combination of an optical and an infrared imaging survey over hundreds of square degrees on the sky allows us to reach an unprecedented accuracy in the redshift calibration of the sources used in the weak lensing measurement. In combination with the well-calibrated KiDS shape measurements this will reveal whether the recently reported tension between Planck CMB measurements and KiDS optical-only cosmic shear results (Hildebrandt et al. 2017) still holds in this improved analysis.
Location: 31 Fitzwilliam Place, Dublin 2
Upcoming seminars:
https://www.dias.ie/2018/03/07/astronomy-and-astrophysics-seminar-schedule-2018/
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Last Updated: 20th March 2018 by Patrick Kavanagh
2018-04-11, 15:00, Dr. Hendrik Hildebrandt (Argelander-Institut für Astronomie, Bonn), KiDS+VIKING: Improved cosmological constraints from cosmic shear tomography with optical+infrared data
Dr. Hendrik Hildebrandt
Argelander-Institut für Astronomie, Bonn
KiDS+VIKING: Improved cosmological constraints from cosmic shear tomography with optical+infrared data
Abstract:
Cosmic shear tomography yields cosmological insights complementary to other probes like the cosmic microwave background (CMB). Ongoing wide-field imaging surveys exploit this to come up with competitive constraints on important cosmological parameters like the matter density and the amplitude of the matter power spectrum. In this talk I will concentrate on recent results from the ongoing European KiDS (Kilo Degree Survey) and VIKING (VISTA Kilo Degree Infrared Galaxy Survey) projects. This unique combination of an optical and an infrared imaging survey over hundreds of square degrees on the sky allows us to reach an unprecedented accuracy in the redshift calibration of the sources used in the weak lensing measurement. In combination with the well-calibrated KiDS shape measurements this will reveal whether the recently reported tension between Planck CMB measurements and KiDS optical-only cosmic shear results (Hildebrandt et al. 2017) still holds in this improved analysis.
Location: 31 Fitzwilliam Place, Dublin 2
Upcoming seminars:
https://www.dias.ie/2018/03/07
Category: Astronomy and Astrophysics Section News & Events, Seminars, Uncategorised
Big thank you to @MartinaPQuinn of @helloalicepr for moderating the discussion, and of course to our panel @NeasaMcG @CormacORafferty and @laoneill111
@CormacORafferty "to cut yourself off from fundamental research means you could miss out on some of the biggest ideas"
@laoneill "it's our job as researchers to keep reminding governments how important basic research is" "For Dev basic research being carried out in Ireland was a badge of pride"
@NeasaMcG Schrödinger's work in causality was not well received by the religious authorities at the time At the same time DIAS did have Catholic priests working on research projects in the early days, so there was not the conflict you might think between science and religion
@laoneill111 Schrödinger was very popular in social circles in Dublin, a bit of a renaissance man
@CormacORafferty Schrödinger was gifted at explaining difficult concepts
@CormacORafferty on how unsuccessful work, in Schrödinger's case, unified field theory, is just as important part of science. And no one has managed to crack it yet! And not forgetting the cat
@laoneill111 how Schrödinger's book inspired scientists to change fields and result in the finding of the double helix.
@NeasaMcG explaining how DIAS came about and how Schrödinger was attracted to Ireland #DIASdiscovers
Panel Discussion getting underway! @laoneill111 @CormacORafferty @NeasaMcG @MartinaPQuinn
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Meet some of our panelists for tomorrows discussion on the impact and legacy of the work carried out by Erwin Schroedinger during his time in Ireland as our first Director of Theoretical Physics Grab a free ticket here: eventbrite.ie/e/115984908985