Evidence for a non‐zero Λ and a low matter density from a combined analysis of the 2dF Galaxy Redshift Survey and cosmic microwave background anisotropies
Identifieur interne : 000426 ( Main/Exploration ); précédent : 000425; suivant : 000427Evidence for a non‐zero Λ and a low matter density from a combined analysis of the 2dF Galaxy Redshift Survey and cosmic microwave background anisotropies
Auteurs : G. Efstathiou [États-Unis] ; Stephen Moody ; John A. Peacock ; Will J. Percival ; Carlton Baugh ; Joss Bland-Hawthorn [Australie] ; Terry Bridges [Australie] ; Russell Cannon [Australie] ; Shaun Cole ; Matthew Colless [Australie] ; Chris Collins ; Warrick Couch [Australie] ; Gavin Dalton ; Roberto De Propris [Australie] ; Simon P. Driver ; Richard S. Ellis [États-Unis] ; Carlos S. Frenk ; Karl Glazebrook [États-Unis] ; Carole Jackson [Australie] ; Ofer Lahav ; Ian Lewis [Australie] ; Stuart Lumsden ; Steve Maddox ; Peder Norberg ; Bruce A. Peterson [Australie] ; Will Sutherland ; Keith Taylor [États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2002-02.
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Abstract
We perform a joint likelihood analysis of the power spectra of the 2dF Galaxy Redshift Survey (2dFGRS) and the cosmic microwave background (CMB) anisotropies under the assumptions that the initial fluctuations were adiabatic, Gaussian and well described by power laws with scalar and tensor indices of ns and nt. On its own, the 2dFGRS sets tight limits on the parameter combination Ωmh, but relatively weak limits on the fraction of the cosmic matter density in baryons Ωb/Ωm. (Here h is Hubble's constant H0 in units of 100 km s−1 Mpc−1. The cosmic densities in baryons, cold dark matter and vacuum energy are denoted by Ωb, Ωc and ΩΛ, respectively. The total matter density is Ωm=Ωb+Ωc and the curvature is fixed by Ωk=1−Ωm−ΩΛ.) The CMB anisotropy data alone set poor constraints on the cosmological constant and Hubble constant because of a ‘geometrical degeneracy’ among parameters. Furthermore, if tensor modes are allowed, the CMB data allow a wide range of values for the physical densities in baryons and cold dark matter (ωb=Ωbh2 and ωc=Ωch2). Combining the CMB and 2dFGRS data sets helps to break both the geometrical and tensor mode degeneracies. The values of the parameters derived here are consistent with the predictions of the simplest models of inflation, with the baryon density derived from primordial nucleosynthesis and with direct measurements of the Hubble parameter. In particular, we find strong evidence for a positive cosmological constant with a ±2σ range of 0.65<ΩΛ<0.85, independently of constraints on ΩΛ derived from Type Ia supernovae.
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DOI: 10.1046/j.1365-8711.2002.05215.x
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Driver</name><affiliation><wicri:noCountry code="subField">9SS</wicri:noCountry></affiliation></author><author><name sortKey="Ellis, Richard S" sort="Ellis, Richard S" uniqKey="Ellis R" first="Richard S." last="Ellis">Richard S. Ellis</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>11Department of Astronomy, Caltech, Pasadena, CA 91125</wicri:regionArea><wicri:noRegion>CA 91125</wicri:noRegion></affiliation></author><author><name sortKey="Frenk, Carlos S" sort="Frenk, Carlos S" uniqKey="Frenk C" first="Carlos S." last="Frenk">Carlos S. Frenk</name><affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Glazebrook, Karl" sort="Glazebrook, Karl" uniqKey="Glazebrook K" first="Karl" last="Glazebrook">Karl Glazebrook</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>12Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218‐2686</wicri:regionArea><wicri:noRegion>MD 21218‐2686</wicri:noRegion></affiliation></author><author><name sortKey="Jackson, Carole" sort="Jackson, Carole" uniqKey="Jackson C" first="Carole" last="Jackson">Carole Jackson</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>6Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611</wicri:regionArea><wicri:noRegion>ACT 2611</wicri:noRegion></affiliation></author><author><name sortKey="Lahav, Ofer" sort="Lahav, Ofer" uniqKey="Lahav O" first="Ofer" last="Lahav">Ofer Lahav</name><affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Lewis, Ian" sort="Lewis, Ian" uniqKey="Lewis I" first="Ian" last="Lewis">Ian Lewis</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>5Anglo‐Australian Observatory, PO Box 296, Epping, NSW 2121</wicri:regionArea><wicri:noRegion>NSW 2121</wicri:noRegion></affiliation></author><author><name sortKey="Lumsden, Stuart" sort="Lumsden, Stuart" uniqKey="Lumsden S" first="Stuart" last="Lumsden">Stuart Lumsden</name><affiliation><wicri:noCountry code="subField">9JT</wicri:noCountry></affiliation></author><author><name sortKey="Maddox, Steve" sort="Maddox, Steve" uniqKey="Maddox S" first="Steve" last="Maddox">Steve Maddox</name><affiliation><wicri:noCountry code="subField">2RD</wicri:noCountry></affiliation></author><author><name sortKey="Norberg, Peder" sort="Norberg, Peder" uniqKey="Norberg P" first="Peder" last="Norberg">Peder Norberg</name><affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Peterson, Bruce A" sort="Peterson, Bruce A" uniqKey="Peterson B" first="Bruce A." last="Peterson">Bruce A. Peterson</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>6Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611</wicri:regionArea><wicri:noRegion>ACT 2611</wicri:noRegion></affiliation></author><author><name sortKey="Sutherland, Will" sort="Sutherland, Will" uniqKey="Sutherland W" first="Will" last="Sutherland">Will Sutherland</name><affiliation><wicri:noCountry code="subField">3HJ</wicri:noCountry></affiliation></author><author><name sortKey="Taylor, Keith" sort="Taylor, Keith" uniqKey="Taylor K" first="Keith" last="Taylor">Keith Taylor</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>11Department of Astronomy, Caltech, Pasadena, CA 91125</wicri:regionArea><wicri:noRegion>CA 91125</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Science, Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2002-02">2002-02</date><biblScope unit="volume">330</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="L29">L29</biblScope><biblScope unit="page" to="L35">L35</biblScope></imprint><idno type="ISSN">0035-8711</idno></series><idno type="istex">FA3A66653225B1A9DAE808F9B1D85311202BAA0D</idno><idno type="DOI">10.1046/j.1365-8711.2002.05215.x</idno><idno type="ArticleID">MNR5215</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>cosmic microwave background</term><term>cosmology: miscellaneous</term><term>galaxies: clusters: general</term><term>large‐scale structure of Universe</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We perform a joint likelihood analysis of the power spectra of the 2dF Galaxy Redshift Survey (2dFGRS) and the cosmic microwave background (CMB) anisotropies under the assumptions that the initial fluctuations were adiabatic, Gaussian and well described by power laws with scalar and tensor indices of ns and nt. On its own, the 2dFGRS sets tight limits on the parameter combination Ωmh, but relatively weak limits on the fraction of the cosmic matter density in baryons Ωb/Ωm. (Here h is Hubble's constant H0 in units of 100 km s−1 Mpc−1. The cosmic densities in baryons, cold dark matter and vacuum energy are denoted by Ωb, Ωc and ΩΛ, respectively. The total matter density is Ωm=Ωb+Ωc and the curvature is fixed by Ωk=1−Ωm−ΩΛ.) The CMB anisotropy data alone set poor constraints on the cosmological constant and Hubble constant because of a ‘geometrical degeneracy’ among parameters. Furthermore, if tensor modes are allowed, the CMB data allow a wide range of values for the physical densities in baryons and cold dark matter (ωb=Ωbh2 and ωc=Ωch2). Combining the CMB and 2dFGRS data sets helps to break both the geometrical and tensor mode degeneracies. The values of the parameters derived here are consistent with the predictions of the simplest models of inflation, with the baryon density derived from primordial nucleosynthesis and with direct measurements of the Hubble parameter. In particular, we find strong evidence for a positive cosmological constant with a ±2σ range of 0.65<ΩΛ<0.85, independently of constraints on ΩΛ derived from Type Ia supernovae.</div></front></TEI><affiliations><list><country><li>Australie</li><li>États-Unis</li></country></list><tree><noCountry><name sortKey="Baugh, Carlton" sort="Baugh, Carlton" uniqKey="Baugh C" first="Carlton" last="Baugh">Carlton Baugh</name><name sortKey="Cole, Shaun" sort="Cole, Shaun" uniqKey="Cole S" first="Shaun" last="Cole">Shaun Cole</name><name sortKey="Collins, Chris" sort="Collins, Chris" uniqKey="Collins C" first="Chris" last="Collins">Chris Collins</name><name sortKey="Dalton, Gavin" sort="Dalton, Gavin" uniqKey="Dalton G" first="Gavin" last="Dalton">Gavin Dalton</name><name sortKey="Driver, Simon P" sort="Driver, Simon P" uniqKey="Driver S" first="Simon P." last="Driver">Simon P. Driver</name><name sortKey="Frenk, Carlos S" sort="Frenk, Carlos S" uniqKey="Frenk C" first="Carlos S." last="Frenk">Carlos S. Frenk</name><name sortKey="Lahav, Ofer" sort="Lahav, Ofer" uniqKey="Lahav O" first="Ofer" last="Lahav">Ofer Lahav</name><name sortKey="Lumsden, Stuart" sort="Lumsden, Stuart" uniqKey="Lumsden S" first="Stuart" last="Lumsden">Stuart Lumsden</name><name sortKey="Maddox, Steve" sort="Maddox, Steve" uniqKey="Maddox S" first="Steve" last="Maddox">Steve Maddox</name><name sortKey="Moody, Stephen" sort="Moody, Stephen" uniqKey="Moody S" first="Stephen" last="Moody">Stephen Moody</name><name sortKey="Norberg, Peder" sort="Norberg, Peder" uniqKey="Norberg P" first="Peder" last="Norberg">Peder Norberg</name><name sortKey="Peacock, John A" sort="Peacock, John A" uniqKey="Peacock J" first="John A." last="Peacock">John A. Peacock</name><name sortKey="Percival, Will J" sort="Percival, Will J" uniqKey="Percival W" first="Will J." last="Percival">Will J. Percival</name><name sortKey="Sutherland, Will" sort="Sutherland, Will" uniqKey="Sutherland W" first="Will" last="Sutherland">Will Sutherland</name></noCountry><country name="États-Unis"><noRegion><name sortKey="Efstathiou, G" sort="Efstathiou, G" uniqKey="Efstathiou G" first="G." last="Efstathiou">G. Efstathiou</name></noRegion><name sortKey="Ellis, Richard S" sort="Ellis, Richard S" uniqKey="Ellis R" first="Richard S." last="Ellis">Richard S. Ellis</name><name sortKey="Glazebrook, Karl" sort="Glazebrook, Karl" uniqKey="Glazebrook K" first="Karl" last="Glazebrook">Karl Glazebrook</name><name sortKey="Taylor, Keith" sort="Taylor, Keith" uniqKey="Taylor K" first="Keith" last="Taylor">Keith Taylor</name></country><country name="Australie"><noRegion><name sortKey="Bland Awthorn, Joss" sort="Bland Awthorn, Joss" uniqKey="Bland Awthorn J" first="Joss" last="Bland-Hawthorn">Joss Bland-Hawthorn</name></noRegion><name sortKey="Bridges, Terry" sort="Bridges, Terry" uniqKey="Bridges T" first="Terry" last="Bridges">Terry Bridges</name><name sortKey="Cannon, Russell" sort="Cannon, Russell" uniqKey="Cannon R" first="Russell" last="Cannon">Russell Cannon</name><name sortKey="Colless, Matthew" sort="Colless, Matthew" uniqKey="Colless M" first="Matthew" last="Colless">Matthew Colless</name><name sortKey="Couch, Warrick" sort="Couch, Warrick" uniqKey="Couch W" first="Warrick" last="Couch">Warrick Couch</name><name sortKey="Jackson, Carole" sort="Jackson, Carole" uniqKey="Jackson C" first="Carole" last="Jackson">Carole Jackson</name><name sortKey="Lewis, Ian" sort="Lewis, Ian" uniqKey="Lewis I" first="Ian" last="Lewis">Ian Lewis</name><name sortKey="Peterson, Bruce A" sort="Peterson, Bruce A" uniqKey="Peterson B" first="Bruce A." last="Peterson">Bruce A. Peterson</name><name sortKey="Propris, Roberto De" sort="Propris, Roberto De" uniqKey="Propris R" first="Roberto De" last="Propris">Roberto De Propris</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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