Imperial College London
Alternate

Professor Andrew H Jaffe

Faculty of Natural Sciences, Department of Physics

Professor of Astrophysics and Cosmology
 
 
 
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Contact

 

+44 (0)20 7594 7526a.jaffe Website

 
 
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Assistant

 

Miss Louise Hayward +44 (0)20 7594 7679

 
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Location

 

1018BBlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Paykari:2015:0004-6361/201526236,
author = {Paykari, P and Pires, S and Starck, J-L and Jaffe, AH},
doi = {0004-6361/201526236},
journal = {Astronomy & Astrophysics},
title = {Sparsely sampling the sky: regular vs. random sampling},
url = {http://dx.doi.org/10.1051/0004-6361/201526236},
volume = {581},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Aims. The next generation of galaxy surveys, aiming to observe millions of galaxies, are expensive both in time and money. This raises questions regarding the optimal investment of this time and money for future surveys. In a previous work, we have shown that a sparse sampling strategy could be a powerful substitute for the – usually favoured – contiguous observation of the sky. In our previous paper, regular sparse sampling was investigated, where the sparse observed patches were regularly distributed on the sky. The regularity of the mask introduces a periodic pattern in the window function, which induces periodic correlations at specific scales.Methods. In this paper, we use a Bayesian experimental design to investigate a “random” sparse sampling approach, where the observed patches are randomly distributed over the total sparsely sampled area.Results. We find that in this setting, the induced correlation is evenly distributed amongst all scales as there is no preferred scale in the window function.Conclusions. This is desirable when we are interested in any specific scale in the galaxy power spectrum, such as the matter-radiation equality scale. As the figure of merit shows, however, there is no preference between regular and random sampling to constrain the overall galaxy power spectrum and the cosmological parameters.
AU  - Paykari,P
AU  - Pires,S
AU  - Starck,J-L
AU  - Jaffe,AH
DO  - 0004-6361/201526236
PY  - 2015///
SN  - 1432-0746
TI  - Sparsely sampling the sky: regular vs. random sampling
T2  - Astronomy & Astrophysics
UR  - http://dx.doi.org/10.1051/0004-6361/201526236
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000361803900113&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/43983
VL  - 581
ER  -
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