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UCL Astrophysics. ~100 people (20 academic staff) Research Areas: Stellar astrophysics, Star formation, Astro-chemistry, Cosmology, Atmospheric Physics, exo-planets, Optics, Mill Hill Observatory. UCL Astrophysics Group Cosmologists. Lucy Clerkin. Sarah Bridle. Donnacha Kirk. - PowerPoint PPT Presentation
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UCL Astrophysics
~100 people (20 academic staff)
• Research Areas: Stellar astrophysics, Star formation, Astro-chemistry,Cosmology, Atmospheric Physics, exo-planets, Optics, Mill Hill Observatory
UCL Astrophysics Group Cosmologists
Ofer Lahav
Tomek Kacprzak
Barney Rowe
Michael Hirsch
Sarah Bridle
Sree Balan
Fotini Economou
Alex Merson
Emily Hall
Lisa Voigt
Joe Zuntz
Jason McEwen
Filipe Abdalla
Emma Chapman
Maayane Sougmanac
Laura Wolz
Boris Leistedt
Stephen Feeney
Hiranya Peiris
Manda Banerji
Donnacha Kirk Lucy Clerkin
Niall MacCrann
Aurelien Benoit-LevyWalter Santos
A brief history of UCL P&A Cosmology
• Start of group: 2004 Ofer Lahav
• 1st generation (2004): – Sarah Bridle -> Professor, Manchester– Jochen Weller -> Professor, Munich
• 2nd generation (2008):– Hiranya Peiris– Filipe Abdalla
• 3rd generation (2012):– Two appointments
Filipe AbdallaRadio/OpticalCosmology
EoR Weak lensing
Euclid DES SKA
Sarah BridleCosmic Shear
Galaxy shapes DES
Dark energy
Ofer LahavGalaxy surveys
MegaZ-LRG 2MRS Photo-z
HST-MCT DES Euclid
Hiranya PeirisEarly Universe
Planck Inflation
Isotropy Non-Gaussianity
Statistical Cosmology from Surveys
GR tests
Future prospectsThe Dark Energy Survey
• Einstein’s cosmological constant• A new fluid called Dark Energy• General Relativity is wrong
Why is the Universe
Accelerating?
5 DES lenses – assembly at UCL
Polishing & coating coordinated by UCL (with £1.76M STFC funding, PI: Lahav)
C3
DES First Light12 Sep 2012
NGC1365
Photometric Redshifts
Collister & Lahav 2004http://www.star.ucl.ac.uk/~lahav/annz.html
Neutrino Mass
Thomas, Abdalla & Lahav, PRL (2010) Lahav, Kiakotou, Abdalla & Blake, MNRAS (2010)Swanson, Percival & Lahav, MNRAS (2010)Kiakotou, Elgaroy & Lahav, PRD (2008)
• Constraints from MegaZ-LRG 700,000 galaxies• 0.05 eV < Total neutrino mass < 0.28 eV (95% CL)
• Forecast constraints from DES
CD
M+
mas
sive
ne
utrin
os
CD
M o
nly
Advanced ERCTESTDE team
DESpec: Spectroscopic
follow up of DES
• 4000–fibre $40M (?) instrument• 7 million galaxy spectra, target list from DES, • DETF Stage IV experiment• DES+DESpec can distinguish DE from ModGrav
Kirk, Lahav, Bridle, Abdalla, Jouvel et al. (in preparation)Jouvel, Abdalla, Blahav, Bridle et al.(in preparation)DESpec white paper Abdalla et al. astro-ph:1209.2451
ESA Euclid
• During the design phase: – Photo-z needs (Abdalla et al. 08)– Coulour dependence of the psf
(Cypriano et al. 10 Voigt et al. 11)
• During the implementation phase– Science working groups.– Science ready data (OU-LE3)– Photo-z (OU-PHZ)– Shear measurement (OU-SHE)
PI: Postman; UCL coI: Lahav + Host & Jouvel
25 clustersTesting conflict with LCDMDiscovering z=10 galaxy candidates
Weak Gravitational Lensing & Intrinsic alignments
Image analysis of galaxy shapes
Figure from the GREAT08 Handbook. Bridle et al 2009
Barney Rowe now co-leading next GREAT-like challenge
Add foregrounds 100-1000 times largerCosmic signal
LOFAR - EoR
• EoR Data being taken now!
• Working on Foreground removal
Recovered signal (Chapman et al. 12a,b)
Yatawata et al. 12
Square Kilometre Array: SKA
• Forecasts, simulations• New imaging techniques
Status of Surveys we are involved in
•HST-CLASH: Observations started in Nov 2010
•Planck: See Hiranya’s talk...
•LOFAR: Telescope is ready, KSP taking data now.
•DES: First light Sep. Survey starts Dec.
•Euclid: Selected by ESA in Oct 2011. Launch 2019
•DESpec, BigBOSS: Study funding from STFC
•SKA: Site selection done. Studies for implementation phase.
Synergies between P&A and other London institutes
• Imperial -> Euclid, Planck, Astro-statistics, Theory, EoR/SKA
• Kings -> Early universe, HEP
• QM-> Early Universe, VISTA
• MSSL (UCL) -> Euclid, Weak lensing, LOFAR