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Cosmological Spectral Deconvolution

de Putter, Roland and Holder, Gilbert P. and Chang, Tzu-Ching and Doré, Olivier (2014) Cosmological Spectral Deconvolution. . (Unpublished)

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One of the main goals of modern observational cosmology is to map the large scale structure of the Universe. A potentially powerful approach for doing this would be to exploit three-dimensional spectral maps, i.e. the specific intensity of extragalactic light as a function of wavelength and direction on the sky, to measure spatial variations in the total extragalactic light emission and use these as a tracer of the clustering of matter. A main challenge is that the observed intensity as a function of wavelength is a convolution of the source luminosity density with the rest-frame spectral energy distribution. In this paper, we introduce the method of spectral deconvolution as a way to invert this convolution and extract the clustering information. We show how one can use observations of the mean and angular fluctuations of extragalactic light as a function of wavelength, assuming statistical isotropy, to reconstruct jointly the rest-frame spectral energy distribution of the sources and the source spatial density fluctuations. This method is more general than the well known line mapping technique as it does not rely on spectral lines in the emitted spectra. After introducing the general formalism, we discuss its implementation and limitations. This formal paper sets the stage for future more practical studies.

Item Type:Report or Paper (Discussion Paper)
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Doré, Olivier0000-0002-5009-7563
Additional Information:Draft version March 18, 2014. We acknowledge the Aspen Center for Physics where part is this work originated. The center is supported by NSF grant 1066293. TC acknowledges support from the Simons Foundation. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
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Simons FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20140402-095520341
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44602
Deposited By: Aucoeur Ngo
Deposited On:02 Apr 2014 18:04
Last Modified:03 Oct 2019 06:19

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