The CMB cold spot: texture, cluster or void?
The non-Gaussian cold spot found in the Wilkinson Microwave Anisotropy Probe (WMAP) data has created controversy about its origin. Here we calculate the Bayesian posterior probability ratios for three different models that could explain the cold spot. A recent work claimed that the spot could be cau...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2008-11, Vol.390 (3), p.913-919 |
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| container_title | Monthly notices of the Royal Astronomical Society |
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| creator | Cruz, M. Martínez-González, E. Vielva, P. Diego, J. M. Hobson, M. Turok, N. |
| description | The non-Gaussian cold spot found in the Wilkinson Microwave Anisotropy Probe (WMAP) data has created controversy about its origin. Here we calculate the Bayesian posterior probability ratios for three different models that could explain the cold spot. A recent work claimed that the spot could be caused by a cosmic texture, while other papers suggest that it could be due to the gravitational effect produced by an anomalously large void. Furthermore, the Sunyaev–Zeldovich effect caused by a cluster is taken into account as a possible origin. We perform a template fitting on a 20° radius patch centred at coordinates (b=−57°, l= 209°) and calculate the posterior probability ratios for the void and Sunyaev–Zeldovich models, comparing the results to those obtained with texture. Taking realistic priors for the parameters, the texture interpretation is favoured, while the void and Sunyaev–Zeldovich hypotheses are discarded. The temperature decrement produced by voids or clusters is negligible considering realistic values for the parameters. |
| doi_str_mv | 10.1111/j.1365-2966.2008.13812.x |
| format | Article |
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M.</creatorcontrib><creatorcontrib>Hobson, M.</creatorcontrib><creatorcontrib>Turok, N.</creatorcontrib><title>The CMB cold spot: texture, cluster or void?</title><title>Monthly notices of the Royal Astronomical Society</title><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><description>The non-Gaussian cold spot found in the Wilkinson Microwave Anisotropy Probe (WMAP) data has created controversy about its origin. Here we calculate the Bayesian posterior probability ratios for three different models that could explain the cold spot. A recent work claimed that the spot could be caused by a cosmic texture, while other papers suggest that it could be due to the gravitational effect produced by an anomalously large void. Furthermore, the Sunyaev–Zeldovich effect caused by a cluster is taken into account as a possible origin. We perform a template fitting on a 20° radius patch centred at coordinates (b=−57°, l= 209°) and calculate the posterior probability ratios for the void and Sunyaev–Zeldovich models, comparing the results to those obtained with texture. Taking realistic priors for the parameters, the texture interpretation is favoured, while the void and Sunyaev–Zeldovich hypotheses are discarded. The temperature decrement produced by voids or clusters is negligible considering realistic values for the parameters.</description><subject>Anisotropy</subject><subject>Astronomy</subject><subject>Bayesian analysis</subject><subject>cosmic microwave background</subject><subject>Cosmic microwave background temperature</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>methods: data analysis</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNqNkVtL5DAYhoOs4OzofygLu1d2zKE5dC920cEjHkB6Id58pGmKHetkTFod_70ZK3MhCuYmCXmeN-ENQgnBExLH3mxCmOApzYWYUIxV3CpCJ8sNNFof_EAjjBlPlSRkC_0MYYYxzhgVI7Rb3NlkenGQGNdWSVi47m_S2WXXe7ubmLYPnfWJ88mTa6r_22iz1m2wO-_zGBVHh8X0JD2_Oj6d7p-nhnNM0xKXmZF5bQmvcqEyq4UmOK85U9hgLsvSlFzLyoiyUlLyuhJMiNKYPGqmYmP0Z4hdePfY29DBQxOMbVs9t64PQHJGlVJZBH99AGeu9_P4NKBYMpVJyiOkBsh4F4K3NSx886D9CxAMqwphBqumYNUUrCqEtwphGdXf7_k6GN3WXs9NE9Z-vEORjJLI_Ru456a1L9_Oh4vL67dlDGBDgOsXX-jpZ89LB6uJv7Rce9rfg5BMcji5uQVC8-JaFmdwxl4BOdugPQ</recordid><startdate>200811</startdate><enddate>200811</enddate><creator>Cruz, M.</creator><creator>Martínez-González, E.</creator><creator>Vielva, P.</creator><creator>Diego, J. 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M.</creatorcontrib><creatorcontrib>Hobson, M.</creatorcontrib><creatorcontrib>Turok, N.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cruz, M.</au><au>Martínez-González, E.</au><au>Vielva, P.</au><au>Diego, J. M.</au><au>Hobson, M.</au><au>Turok, N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The CMB cold spot: texture, cluster or void?</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><stitle>Monthly Notices of the Royal Astronomical Society</stitle><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><date>2008-11</date><risdate>2008</risdate><volume>390</volume><issue>3</issue><spage>913</spage><epage>919</epage><pages>913-919</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><coden>MNRAA4</coden><abstract>The non-Gaussian cold spot found in the Wilkinson Microwave Anisotropy Probe (WMAP) data has created controversy about its origin. Here we calculate the Bayesian posterior probability ratios for three different models that could explain the cold spot. A recent work claimed that the spot could be caused by a cosmic texture, while other papers suggest that it could be due to the gravitational effect produced by an anomalously large void. Furthermore, the Sunyaev–Zeldovich effect caused by a cluster is taken into account as a possible origin. We perform a template fitting on a 20° radius patch centred at coordinates (b=−57°, l= 209°) and calculate the posterior probability ratios for the void and Sunyaev–Zeldovich models, comparing the results to those obtained with texture. Taking realistic priors for the parameters, the texture interpretation is favoured, while the void and Sunyaev–Zeldovich hypotheses are discarded. The temperature decrement produced by voids or clusters is negligible considering realistic values for the parameters.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/j.1365-2966.2008.13812.x</doi><tpages>7</tpages></addata></record> |
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| subjects | Anisotropy Astronomy Bayesian analysis cosmic microwave background Cosmic microwave background temperature Earth, ocean, space Exact sciences and technology methods: data analysis |
| title | The CMB cold spot: texture, cluster or void? |
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