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Cosmology with the South Pole Telescope
Zak Staniszewski (Case)
Berkeley:William HolzapfelAdrian LeeHelmuth SpielerSherry ChoBradford BensonHuan TranMartin LuekerJared MehlTom PlaggeDan SchwanErik Shirokoff
University of Chicago:John Carlstrom (P.I)Steve Padin (Proj. Manager, yr1 winter)Stephan MeyerClem PrykeTom CrawfordJeff McMahonClarence ChangKathryn MiknaitisJoaquin VieiraRyan KeislerLindsey BleemAbigail CritesYear 2 winterovers:Keith Vanderlinde Dana Hrubes
Case:John RuhlTom MontroyZak Staniszewski (Me, yr1 Winterover)Wenyang Lu
Harvard Smithsonian:Antony Stark
UIUC:
Joe Mohr
Colorado:Nils Halverson
McGill:Matt DobbsGil HolderTrevor Lanting
JPL:Erik Leitch
UC Davis:Lloyd KnoxJason Dick
Berkeley:William HolzapfelAdrian LeeHelmuth SpielerSherry ChoBradford BensonHuan TranMartin LuekerJared MehlTom PlaggeDan SchwanErik Shirokoff
University of Chicago:John Carlstrom (P.I)Steve Padin (Proj. Manager, yr1 winter)Stephan MeyerClem PrykeTom CrawfordJeff McMahonClarence ChangKathryn MiknaitisJoaquin VieiraRyan KeislerLindsey BleemAbigail CritesYear 2 winterovers:Keith Vanderlinde Dana Hrubes
What is SPT
• 10 meter telescope• At South Pole• CMB telescope• 90,150, 220 GHz– WMAP(20-90)
• 1 arcminute resolution
SPT optics features• 10 meter off axis Gregorian
design• 1 meter cold secondary
mirror• Paneled primary mirror• 20-30 micron primary, 40-
50 micron secondary (current)
• Warm receiver cabin
Science with SPT• Dark Energy– Cluster survey
• High ell power spectrum• Cluster science– Tracing Baryons
• Point sources– Learn astronomy– Help Planck
• Unresolved sources may bias non-Gaussianity result
SPT Primary goalDN/DZ with clusters
G. Holder in Ruhl et al 2004
The Sunyaev Zel’dovich Effect
Design considerations focal plane
Measured SZ spectrumof A2163
• SPT observing regions– Observed SPT regions
in Magenta– First year results only
from green BCS 5Hr field.
– *BCS optical data in green
– First results are only from one small green region
We find clusters!
Known cluster from REFLEX survey
First Galaxy clusters discovered with the SZ effect!!!
http://arxiv.org/abs/0810.1578
- First Clusters ever discovered with the SZE-First SPT results paper out just 2 months ago
Three new discoveries
• First clusters discovered with an SZ survey!!!
• All confirmed by optical follow up
• Two near redshift 0.8
Optical confirmation from BCS
You should be excited
• We want Dn/Dz• Remember, these are only our slam dunk cluster candidates• Only from 40 square degrees. We currently have 200
square degrees– Second 100 sq degree field is deeper
• Better processing and cluster finding– Map processing studies– Utilize 90, 220 GHz for a multi frequency filter
• In two years we should have both 90 and 150 to equal the same sensitivity in ~1000 square degrees.
SPT ScienceHigh el CMB
Reichardt et al 2008
ACBAR 2008Projected SPT
W. Hu from Ruhl et al 2004
More on power spectrum
• Could constrain ns
• Lensing, v in the future• Need good calibration
Hu (2001)
Absolute calibration
• HII regions– RCW 38, MAT5a– Integrate RCW38 flux and
compare to ACBAR or Boomerang
• WMAP– Dedicate ~20 hours to look
at 500 sq.
MAT5a
SZ image of Bullet Cluster
z = .2977 hours of observation• ~ 20 mK RMS per 60” pixel
SZ emission radial profile• r500 = 1.6 Mpc; q500 = 5.4’; q200 = 8.6’• Significant signal seen at q > 12’ radius • Model shown is b=.87, qc=1.8 (very well constrained)
Targeted program
• Where are the baryons• How does SZ flux scale with mass• 25 massive clusters observed• Some relaxed clusters
20
SED of SMG
SPT SCUBA
Credit: B
lain, Smail, Ivison, K
neib, & Frayer 2002
Point sources
Conclusion
• Expect variety of result papers soon.• dn/dz from cluster survey on its way
– ACT,APEX,Planck as well• Planck’s beam a bit too big
• High ell power spectrum– Ns, neutrinos, lensing
• Cluster science, missing baryons• Emerging point source field
– Also help Planck• Polarization receiver in 2-3 years
– High ell polarization
Thank You