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