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/
Leave a Comment
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
Here is when you will be able to see the 'Super Blood Wolf Moon' this weekend via @irishexaminer #DIASdiscovers irishexaminer.com/breakingnews/i…
Great to see our very own Dr Rebeca Garcia Lopez featured in both the @irishexaminer and the @Independent_ie as one of 20 @scienceirel Starting Investigator Research Grant awardees. #DIASdiscovers
Great piece by @KOSullivanIT in the @IrishTimes today on the unveiling of Shei;a Tinney's portrait yesterday at DIAS with @mitchelloconnor and the family of Dr Tinney. Read it online here: bit.ly/2FvErVs
We were delighted to have @mitchelloconnor , Minister of State for Higher Education, with us on this special occasion today. twitter.com/DIAS_Dublin/st…
We are so proud of Dr Rebeca Garcia Lopez who is one of 20 to receive funding under the @scienceirel SIRG programmes. Congratulations, Rebeca - it is so deserved! #DIASdiscovers twitter.com/scienceirel/st…
A proud day for DIAS, celebrating our past and present female scientists: news that Dr Rebeca Garcia Lopez (DIAS) has received funding via @scienceirel Starting Investigator Research Grant & unveiling of the portrait of renowned scientist & 1st female Fellow of DIAS,Sheila Tinney
Some final words from Sheila’s daughter, Deirdre. #DIASdiscovers
The beautiful portrait of Sheila Tinney, by Judith Henihan, officially unveiled by the family of Sheila and @mitchelloconnor
We’re now moving on to the official unveiling of the portrait by Minister Mary Mitchell O’Connor @mitchelloconnor #DIASdiscovers
Sheila Tinney’s daughter Ethna tells us how she recalls her mother remarking approvingly how De Valera initiated the establishment of DIAS #DIASdiscovers
We are delighted to be joined by the daughters and son of Sheila Tinney here at DIAS today for the unveiling. Her son Hugh speaking now on her extensive career as a scientist #DIASdiscovers
Today we’re hosting a very special lunchtime reception to unveil a portrait of former DIAS Fellow and renowned scientist, Sheila Tinney #DIASdiscovers
We were sad to hear of the passing of Sir Michael Atiyah last week, aged 89. Atiyah was a great former chair of the board of our School of Theoretical Physics here at DIAS from 2000-2005. Ar dheis Dé go raibh a anam dílis. (Below, pictured in DIAS's Conference Room) @StpDias
Congrats to @StKiliansDS team Roan Batard, Ethan McQuaid & Marilou Gerbelot-Barillon on winning the Group 2nd place in Physical, Chemical & Mathematical Sci at @BTYSTE lfor their project: 'What makes Dublin shake?' @dias_geophysics were delighted to support you with your project! twitter.com/NBourgeois_Pro…