Please use this identifier to cite or link to this item:
http://hdl.handle.net/2289/6234
Title: | CMB distortion from circumgalactic gas |
Authors: | Singh, Priyanka Nath, Biman B. Majumdar, S. Silk, Joseph |
Issue Date: | 11-Apr-2015 |
Publisher: | Oxford University Press for the Royal Astronomical Society |
Citation: | Monthly Notices of the Royal Astronomical Society, 2015, Vol. 448, p2384-2396 |
Abstract: | We study the Sunyaev–Zel'dovich (SZ) distortion of the cosmic microwave background radiation from extensive circumgalactic gas (CGM) in massive galactic haloes. Recent observations have shown that galactic haloes contain a large amount of X-ray emitting gas at the virial temperature, as well as a significant amount of warm O vi absorbing gas. We consider the SZ distortion from the hot gas in those galactic haloes in which the gas cooling time is longer than the halo destruction time-scale. We show that the SZ distortion signal from the hot gas in these galactic haloes at redshifts z ≈ 1–8 can be significant at small angular scales (ℓ ∼ 104), and dominate over the signal from galaxy clusters. The estimated SZ signal for most massive galaxies (halo mass ≥1012.5 M⊙) is consistent with the marginal detection by Planck at these mass scales. We also consider the SZ effect from warm circumgalactic gas. The integrated Compton distortion from the warm O vi absorbing gas is estimated to be y ∼ 10−8, which could potentially be detected by experiments planned for the near future. Finally, we study the detectability of the SZ signal from circumgalactic gas in two types of surveys, a simple extension of the South Pole Telescope survey and a more futuristic cosmic-variance-limited survey. We find that these surveys can easily detect the kinetic Sunyaev–Zel'dovich signal from CGM. With the help of a Fisher matrix analysis, we find that it will be possible for these surveys to constrain the gas fraction in CGM, after marginalizing over cosmological parameters, to ≤33 per cent, in case of no redshift evolution of the gas fraction. |
Description: | Open Access |
URI: | http://hdl.handle.net/2289/6234 |
ISSN: | 0035-8711 1365-2966 - (online) |
Alternative Location: | http://adsabs.harvard.edu/abs/2015MNRAS.448.2384S http://arxiv.org/abs/1408.4896 http://dx.doi.org/10.1093/mnras/stv155 |
Copyright: | 2015 The authors & the Royal Astronomical Society |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2015_MNRAS_448_2384-96.pdf | Open Access | 1.16 MB | Adobe PDF | View/Open |
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.