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	<title>Supervoids and Superclusters</title>
	<link>http://ifa.hawaii.edu/cosmowave/supervoids</link>
	<description>exploring dark energy and dark matter in the universe</description>
	<lastBuildDate>Thu, 31 Jul 2008 21:18:36 +0000</lastBuildDate>
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		<title>Cosmic imprints of supervoids and superclusters from dark energy</title>
		<description><![CDATA[

Figure credit: Granett, Neyrinck &#038; Szapudi.  Large-scale structures in tube modified from a Millennium simulation picture.
This website is about our discovery that vast superclusters and supervoids of galaxies, half a billion light-years across, in the Universe cause faint glows and shadows (respectively) in microwaves that pass through them.  We interpret this as an [...]]]></description>
		<link>http://ifa.hawaii.edu/cosmowave/supervoids/cosmic-imprints-of-supervoids-and-superclusters-from-dark-energy/</link>
			</item>
	<item>
		<title>Supervoids and superclusters</title>
		<description><![CDATA[To find the largest structures we could in the Universe, we used a catalog of extremely bright galaxies from the  Sloan Digital Sky Survey. They occupy a vast volume; the most distant galaxies in the sample are about 10 billion light-years away, and the survey occupies about 1/4 of the sky.  Using Voronoi [...]]]></description>
		<link>http://ifa.hawaii.edu/cosmowave/supervoids/superstructures/</link>
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		<title>Cosmic cartography</title>
		<description><![CDATA[
This figure shows the positions of our supervoids (blue circles) and superclusters (red circles) superimposed on the cosmic microwave background, as measured by NASA&#8217;s WMAP satellite.  The light-colored area is that covered by the SDSS galaxy survey, in which we found our structures.  At the top of the figure is the North celestial pole (near [...]]]></description>
		<link>http://ifa.hawaii.edu/cosmowave/supervoids/cosmic-cartography/</link>
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		<title>Imprints of structure</title>
		<description><![CDATA[
This is the main scientific figure of our paper, showing dark energy in action as it stretches supervoids and superclusters to cool or heat light (in this case, the CMB) passing through them.   The Cosmic Microwave Background (CMB) is the most distant light we can see; it&#8217;s so far away that the expansion of [...]]]></description>
		<link>http://ifa.hawaii.edu/cosmowave/supervoids/imprints-of-structure/</link>
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		<title>The Integrated Sachs-Wolfe Effect</title>
		<description><![CDATA[
A supercluster is a huge region of the Universe with relatively many galaxies; a supervoid is a huge region with relatively few. When light travels into a supercluster, it heats up, gaining energy as though it were rolling into a valley.  When the light leaves the supercluster, it must give that energy back. But [...]]]></description>
		<link>http://ifa.hawaii.edu/cosmowave/supervoids/the-integrated-sachs-wolfe-effect/</link>
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		<title>Publications and data</title>
		<description><![CDATA[The paper entitled, `An Imprint of Super-Structures on the Microwave Background due to the Integrated Sachs-Wolfe Effect&#8217; is available for download: arxiv:0805.3695.  Also refer to the supplement at arxiv:0805.2974.
Data
Here are the void and cluster catalogs. See tables 4 and 5 of the supplement for explanation of these fields.
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		<link>http://ifa.hawaii.edu/cosmowave/supervoids/publications-and-data/</link>
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