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The pressure profiles of hot gas in local galaxy groups | | M. Sun
; N. Sehgal
; G. M. Voit
; M. Donahue
; C. Jones
; W. Forman
; A. Vikhlinin
; C. Sarazin
; | | Date: |
1 Dec 2010 | | Abstract: | Recent measurements of the Sunyaev-Zel’dovich (SZ) angular power spectrum
from the South Pole Telescope (SPT) and the Atacama Cosmology Telescope (ACT)
demonstrate the importance of understanding baryon physics when using the SZ
power spectrum to constrain cosmology. This is challenging since roughly half
of the SZ power at l=3000 is from low-mass systems with 10^13 h^-1 M_sun <
M_500 < 1.5x10^14 h^-1 M_sun, which are more difficult to study than systems of
higher mass. We present a study of the thermal pressure content for a sample of
local galaxy groups from Sun et al. (2009). The group Y_{sph, 500} - M_500
relation agrees with that derived by Arnaud et al. (2010). The group median
pressure profile also agrees with the universal pressure profile derived by
Arnaud et al. (2010). With this in mind, we briefly discuss several ways to
alleviate the tension between the measured low SZ power and the predictions
from SZ templates. | | Source: | arXiv, 1012.0312 | | Services: | Forum | Review | PDF | Favorites | |
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