Determining the Cosmic Distance Scale with Galaxy Clusters
description
Transcript of Determining the Cosmic Distance Scale with Galaxy Clusters
![Page 1: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/1.jpg)
CfA Oct 8 2003
Determining the Cosmic Distance Scale with Galaxy
Clusters
Erik Reese
University of California, Berkeley
![Page 2: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/2.jpg)
CfA Oct 8 2003
The Sunyaev-Zel’dovich Effect
![Page 3: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/3.jpg)
CfA Oct 8 2003
BIMA & OVRO
![Page 4: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/4.jpg)
CfA Oct 8 2003
![Page 5: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/5.jpg)
CfA Oct 8 2003
Distance Calculation
With geometry of the cluster
![Page 6: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/6.jpg)
CfA Oct 8 2003
Hubble Constant
With z and geometry of the universe
Independent of the extra-galactic distance ladder!
For a sample of clusters, fit to the theoretical DA relation, where H0 is the normalization
![Page 7: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/7.jpg)
CfA Oct 8 2003
Angular Diameter Distances: Present
![Page 8: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/8.jpg)
CfA Oct 8 2003
H0 Current Results• Ryle → 5 clusters (Jones et al. 2003)
• OVRO 5m → 7 clusters (Mason et al. 2000)
• OVRO/BIMA → 18 clusters (Reese et al. 2002)
![Page 9: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/9.jpg)
CfA Oct 8 2003
H0 Current Results
• Combined → 41 distances
Reminder: All ROSAT data
![Page 10: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/10.jpg)
CfA Oct 8 2003
SystematicsSZE calibration [H0~(∆T0)-2] ± 8%
X-ray calibration ±10%
NH ± 5%
Asphericity● ± 5%
Isothermality ±10%
Clumping −20%
Undetected radio sources ±12%
Kinetic SZE● ± 2%
Primary CMB● ± 1%
Radio Halos ± 4%
Primary Beam ± 3%
Total +22% −30%
![Page 11: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/11.jpg)
CfA Oct 8 2003
Chandra
![Page 12: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/12.jpg)
CfA Oct 8 2003
Angular Diameter Distances: Chandra
![Page 13: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/13.jpg)
CfA Oct 8 2003
DA Future
![Page 14: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/14.jpg)
CfA Oct 8 2003
Supernovae Type Ia
![Page 15: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/15.jpg)
CfA Oct 8 2003
Challenges
• Systematics• Modeling• Sample selection
– Sample sizes – Unbiassed selection criteria– Wonky clusters
• Convince X-ray TACs• High redshift→cosmology
![Page 16: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/16.jpg)
CfA Oct 8 2003
SZE Surveys
• Large samples of clusters• High redshift clusters• Clean selection function
Holder et al. 2000
![Page 17: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/17.jpg)
CfA Oct 8 2003
Simulations
Courtesy of Martin White
![Page 18: Determining the Cosmic Distance Scale with Galaxy Clusters](https://reader036.fdocuments.in/reader036/viewer/2022062409/5681472b550346895db4648f/html5/thumbnails/18.jpg)
CfA Oct 8 2003
Summary• H0 independent of extragalactic distance ladder
• Systematics are approachable• SZE Surveys
– Large numbers of clusters– High redshift – Sample selection
• Symbiotic with cluster number counts