Simon Fraser University
SFU Cosmology Seminars

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Wednesday, 3 September 2014, 16:15 in P8445A

Dr. Yin-Zhe Ma (UBC)

Searching for missing baryons

Previous studies of galaxy formation have shown that only 10 per cent of the baryons are in compact objects, while 90 per cent of them are missing. Numerical simulation shows that the missing baryons are in a state of diffuse plasma with temperature 10^5 to 10^7 Kevlin, which is hard to be detected by X-ray observations. In this talk, we present a thermal Sunyaev-Zeldovich - Lensing cross-correlation (from the Canada France Hawaii Lensing Survey (CFHTLenS) and Planck’s thermal Sunyaev Zeldovich maps), and constrain the diffuse baryon component with the various pressure profile. We find that the 1 and 2 halo terms detected at 3.96σ and 3.67σ confidence level (CL) respectively. The effective virial temperature of the isothermal gas is found to be in the range 7*105--3*108 K. In addition, by stacking the pairs of luminous red galaxies, we can place a constraint on the temperature of the filament in between the dark matter halos.

Seminars in 2014:

2014-09-03 16:15 in P8445A - Yin-Zhe Ma (UBC): Searching for missing baryons
2014-10-02 16:00 in P8445A - Gabor Kunstatter (University of Winnipeg): The stability of AdS spacetime in Einstein-Gauss-Bonnet gravity
2014-10-03 14:30 in AQ3005 - Gabor Kunstatter (University of Winnipeg): The black hole information loss problem: Is there light at the end of the tunnel? (physics colloquium)
2014-10-23 16:00 in P8445A - Yuting Wang (NAOC Beijing): Cosmological forecasts for galaxy surveys using multi-tracer techniques
2014-10-30 16:00 in P8445A - Yun Li (SFU): Primordial magnetic fields
2014-11-06 16:00 in P8445A - Tomas Galvez (SFU): Bimetric models of gravity and cosmology in the early universe
2014-11-20 16:00 in P8445A - Micah Brush (SFU): 3D cosmological observables in spherical coordinates
2015-01-12 12:00 in P8445B - Misao Sasaki (YITP, Kyoto University): Reviving open inflation
2015-01-20 15:30 in P8445B - Alessandra Silvestri (Lorentz Institute, Leiden): Testing gravity within the EFT framework of cosmic acceleration
2015-01-26 12:00 in P8445B - Gong-Bo Zhao (NAOC, Beijing and ICG, Portsmouth): Cosmological tests of gravity
2015-03-05 14:00 in P8445A - Scott Chapman (Dalhousie University): Studying the epoch of inflation with the cosmic microwave background

[ See complete seminar archives | iCal feed ]

Modified by Andrei Frolov <frolov@sfu.ca> on 2023-11-01