A high deuterium abundance at redshift z = 0.7
Identifieur interne : 00D101 ( Main/Exploration ); précédent : 00D100; suivant : 00D102A high deuterium abundance at redshift z = 0.7
Auteurs : J. K. Webb [Australie, Royaume-Uni] ; R. F. Carswell [Royaume-Uni] ; K. M. Lanzetta [États-Unis] ; R. Ferlet [France] ; M. Lemoine [États-Unis] ; A. Vidal-Madjar [France] ; D. V. Bowen [Royaume-Uni]Source :
- Nature : (London) [ 0028-0836 ] ; 1997.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Of the light elements, the primordial abundance of deuterium relative to hydrogen, (D/H)p, provides the most sensitive diagnostic for the cosmological mass density parameter, ΩB, Recent high-redshift D/H measurements are highly discrepant, although this may reflect observational uncertainties. The larger primordial D/H values imply a low ΩB(requiring the Universe to be dominated by non-baryonic matter), and cause problems for galactic chemical evolution models, which have difficulty in reproducing the steep decline in D/H to the present-day values. Conversely, the lower D/H values measured at high redshift imply an ΩB greater than that derived from 7Li and 4He abundance measurements, and may require a deuterium-abundance evolution that is too low to easily explain. Here we report the first measurement of D/H at intermediate redshift (z = 0.7010), in a gas cloud selected to minimize observational uncertainties. Our analysis yields a value of D/H ((2.0 ± 0.5) x 10-4 ) which is at the upper end of the range of values measured at high redshifts. This finding, together with other independent observations, suggests that there may be inhomogeneity in (D/H)p of at least a factor of ten.
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K." last="Webb">J. K. Webb</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>School of Physics, University of New South Wales</s1><s2>Sydney, NSW 2052</s2><s3>AUS</s3><sZ>1 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Sydney, NSW 2052</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Astronomy Centre, Sussex University, Falmer</s1><s2>Brighton BNI 9QH</s2><s3>GBR</s3><sZ>1 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Brighton BNI 9QH</wicri:noRegion></affiliation></author><author><name sortKey="Carswell, R F" sort="Carswell, R F" uniqKey="Carswell R" first="R. F." last="Carswell">R. F. Carswell</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Institute of Astronomy, Madingley Road</s1><s2>Cambridge CB3 OHA</s2><s3>GBR</s3><sZ>2 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Cambridge CB3 OHA</wicri:noRegion></affiliation></author><author><name sortKey="Lanzetta, K M" sort="Lanzetta, K M" uniqKey="Lanzetta K" first="K. M." last="Lanzetta">K. M. Lanzetta</name><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Department of Physics and Astronomy, State University of New York at Stony Brook</s1><s2>Stony Brook, New York 11794-3800</s2><s3>USA</s3><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Stony Brook, New York 11794-3800</wicri:noRegion></affiliation></author><author><name sortKey="Ferlet, R" sort="Ferlet, R" uniqKey="Ferlet R" first="R." last="Ferlet">R. Ferlet</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Institut d'Astrophysique, 98 bis Boulevard Arago</s1><s2>Paris 75014</s2><s3>FRA</s3><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>75014</wicri:noRegion><placeName><settlement type="city">Paris</settlement><region type="région" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Lemoine, M" sort="Lemoine, M" uniqKey="Lemoine M" first="M." last="Lemoine">M. Lemoine</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Astronomy & Astrophysics, Enrico Fermi Institute, The University of Chicago</s1><s2>Chicago, Illinois 60637-1433</s2><s3>USA</s3><sZ>5 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Chicago, Illinois 60637-1433</wicri:noRegion></affiliation></author><author><name sortKey="Vidal Madjar, A" sort="Vidal Madjar, A" uniqKey="Vidal Madjar A" first="A." last="Vidal-Madjar">A. Vidal-Madjar</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Institut d'Astrophysique, 98 bis Boulevard Arago</s1><s2>Paris 75014</s2><s3>FRA</s3><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>75014</wicri:noRegion><placeName><settlement type="city">Paris</settlement><region type="région" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Bowen, D V" sort="Bowen, D V" uniqKey="Bowen D" first="D. V." last="Bowen">D. V. Bowen</name><affiliation wicri:level="1"><inist:fA14 i1="07"><s1>Royal Observatory Edinburgh, Blackford Hill</s1><s2>Edinburgh EH9 3HJ</s2><s3>GBR</s3><sZ>7 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Edinburgh EH9 3HJ</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Nature : (London)</title><title level="j" type="abbreviated">Nature : (Lond.)</title><idno type="ISSN">0028-0836</idno><imprint><date when="1997">1997</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Nature : (London)</title><title level="j" type="abbreviated">Nature : (Lond.)</title><idno type="ISSN">0028-0836</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abundance</term><term>Deuterium</term><term>Intergalactic matter</term><term>Quasars</term><term>Red shift</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Quasar</term><term>Matière intergalactique</term><term>Deutérium</term><term>Abondance</term><term>Déplacement vers le rouge</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Of the light elements, the primordial abundance of deuterium relative to hydrogen, (D/H)<sub>p</sub>, provides the most sensitive diagnostic for the cosmological mass density parameter, Ω<sub>B</sub>, Recent high-redshift D/H measurements are highly discrepant, although this may reflect observational uncertainties. The larger primordial D/H values imply a low Ω<sub>B</sub>(requiring the Universe to be dominated by non-baryonic matter), and cause problems for galactic chemical evolution models, which have difficulty in reproducing the steep decline in D/H to the present-day values. Conversely, the lower D/H values measured at high redshift imply an Ω<sub>B</sub> greater than that derived from <sup>7</sup>Li and <sup>4</sup>He abundance measurements, and may require a deuterium-abundance evolution that is too low to easily explain. Here we report the first measurement of D/H at intermediate redshift (z = 0.7010), in a gas cloud selected to minimize observational uncertainties. Our analysis yields a value of D/H ((2.0 ± 0.5) x 10<sup>-4</sup> ) which is at the upper end of the range of values measured at high redshifts. This finding, together with other independent observations, suggests that there may be inhomogeneity in (D/H)<sub>p</sub> of at least a factor of ten.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Île-de-France</li></region><settlement><li>Paris</li></settlement></list><tree><country name="Australie"><noRegion><name sortKey="Webb, J K" sort="Webb, J K" uniqKey="Webb J" first="J. K." last="Webb">J. K. Webb</name></noRegion></country><country name="Royaume-Uni"><noRegion><name sortKey="Webb, J K" sort="Webb, J K" uniqKey="Webb J" first="J. K." last="Webb">J. K. Webb</name></noRegion><name sortKey="Bowen, D V" sort="Bowen, D V" uniqKey="Bowen D" first="D. V." last="Bowen">D. V. Bowen</name><name sortKey="Carswell, R F" sort="Carswell, R F" uniqKey="Carswell R" first="R. F." last="Carswell">R. F. Carswell</name></country><country name="États-Unis"><noRegion><name sortKey="Lanzetta, K M" sort="Lanzetta, K M" uniqKey="Lanzetta K" first="K. M." last="Lanzetta">K. M. Lanzetta</name></noRegion><name sortKey="Lemoine, M" sort="Lemoine, M" uniqKey="Lemoine M" first="M." last="Lemoine">M. Lemoine</name></country><country name="France"><region name="Île-de-France"><name sortKey="Ferlet, R" sort="Ferlet, R" uniqKey="Ferlet R" first="R." last="Ferlet">R. Ferlet</name></region><name sortKey="Vidal Madjar, A" sort="Vidal Madjar, A" uniqKey="Vidal Madjar A" first="A." last="Vidal-Madjar">A. Vidal-Madjar</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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