A Clustered Extragalactic Foreground Model for the EoR
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© 2018 International Astronomical Union. We review an improved statistical model of extra-galactic point-source foregrounds first introduced in Murray et al. (2017), in the context of the Epoch of Reionization. This model extends the instrumentally-convolved foreground covariance used in inverse-covariance foreground mitigation schemes, by considering the cosmological clustering of the sources. In this short work, we show that over scales of k ~ (0.6, 40.)hMpc -1 , ignoring source clustering is a valid approximation. This is in contrast to Murray et al. (2017), who found a possibility of false detection if the clustering was ignored. The dominant cause for this change is the introduction of a Galactic synchrotron component which shadows the clustering of sources.
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Wang, L.; Cooray, A.; Farrah, D.; Amblard, A.; Auld, R.; Bock, J.; Brisbin, D.; Burgarella, D.; Chanial, P.; Clements, D.; Eales, S.; Franceschini, A.; Glenn, J.; Gong, Y.; Griffin, M.; Heinis, S.; Ibar, E.; Ivison, R.; Mortier, A.; Oliver, S.; Page, M.; Papageorgiou, A.; Pearson, C.; Pérez-Fournon, I.; Pohlen, M.; Rawlings, J.; Raymond, G.; Rodighiero, G.; Roseboom, I.; Rowan-Robinson, M.; Scott, D.; Serra, P.; Seymour, Nick; Smith, A.; Symeonidis, M.; Tugwell, K.; Vaccari, M.; Vieira, J.; Vigroux, L.; Wright, G. (2011)Cosmic magnification is due to the weak gravitational lensing of sources in the distant Universe by foreground large-scale structure leading to coherent changes in the observed number density of the background sources. ...
Murray, Steven; Trott, Cathryn; Jordan, C. (2017)© 2017. The American Astronomical Society. All rights reserved.. We present a sophisticated statistical point-source foreground model for low-frequency radio Epoch of Reionization (EoR) experiments using the 21 cm neutral ...
Planck intermediate results. II. Comparison of Sunyaev-Zeldovich measurements from Planck and from the Arcminute Microkelvin Imager for 11 galaxy clustersHurley-Walker, N (2013)A comparison is presented of Sunyaev-Zeldovich measurements for 11 galaxy clusters as obtained by Planck and by the ground-based interferometer, the Arcminute Microkelvin Imager. Assuming a universal spherically-symmetric ...