Improved constraints on possible variation of physical constants from H i 21‐cm and molecular QSO absorption lines
Identifieur interne : 00BA12 ( Main/Exploration ); précédent : 00BA11; suivant : 00BA13Improved constraints on possible variation of physical constants from H i 21‐cm and molecular QSO absorption lines
Auteurs : M. T. Murphy [Australie] ; J. K. Webb [Australie] ; V. V. Flambaum [Australie] ; M. J. Drinkwater [Australie] ; F. Combes [France] ; T. Wiklind [Suède]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2001-11.
English descriptors
- KwdEn :
- Absorption lines, Absorption spectra, Absorption system, Absorption systems, Carilli, Combes, Constraint, Data show, Different sightlines, Extra dimensions, Flambaum, Lett, Mnras, Molecular absorption, Molecular absorption lines, Molecular frequencies, Molecular transitions, Optical results, Optical studies, Other constraints, Phys, Physical constants, Possible variation, Qsos, Redshift, Solid line, Tted velocity components, Upper limit, Upper limits, Varshalovich, Varshalovich potekhin, Velocity components, Webb, Wiklind, Wiklind combes, line: profiles, quasars: absorption lines, quasars: individual: PKS 1413+135, quasars: individual: TXS 0218+357, techniques: spectroscopic.
- Teeft :
- Absorption lines, Absorption spectra, Absorption system, Absorption systems, Carilli, Combes, Constraint, Data show, Different sightlines, Extra dimensions, Flambaum, Lett, Mnras, Molecular absorption, Molecular absorption lines, Molecular frequencies, Molecular transitions, Optical results, Optical studies, Other constraints, Phys, Physical constants, Possible variation, Qsos, Redshift, Solid line, Tted velocity components, Upper limit, Upper limits, Varshalovich, Varshalovich potekhin, Velocity components, Webb, Wiklind, Wiklind combes.
Abstract
Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H i 21‐cm absorption with corresponding molecular (rotational) absorption spectra allows us to constrain variation in , where α is the fine‐structure constant and gp is the proton g‐factor. We analyse spectra of two QSOs, PKS 1413+135 and TXS 0218+357, and derive values of at absorption redshifts of and 0.6847 by simultaneous fitting of the H i 21‐cm and molecular lines. We find and respectively, indicating an insignificantly smaller y in the past. We compare our results with other constraints from the same two QSOs given recently by Drinkwater et al. and Carilli et al., and with our recent optical constraints, which indicated a smaller α at higher redshifts.
Url:
- https://api.istex.fr/document/1F59B73A25D9480DB14F427012D5AD2657A7AB03/fulltext/pdf
- https://api.istex.fr/document/442F9A93463D2E21AC1A2B87A23580D2EEE812CD/fulltext/pdf
DOI: 10.1046/j.1365-8711.2001.04843.x
Affiliations:
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T." last="Murphy">M. T. Murphy</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>1School of Physics, The University of New South Wales, UNSW Sydney, NSW 2052</wicri:regionArea><wicri:noRegion>NSW 2052</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Webb, J K" sort="Webb, J K" uniqKey="Webb J" first="J. K." last="Webb">J. K. Webb</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>1School of Physics, The University of New South Wales, UNSW Sydney, NSW 2052</wicri:regionArea><wicri:noRegion>NSW 2052</wicri:noRegion></affiliation></author><author><name sortKey="Flambaum, V V" sort="Flambaum, V V" uniqKey="Flambaum V" first="V. V." last="Flambaum">V. V. Flambaum</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>1School of Physics, The University of New South Wales, UNSW Sydney, NSW 2052</wicri:regionArea><wicri:noRegion>NSW 2052</wicri:noRegion></affiliation></author><author><name sortKey="Drinkwater, M J" sort="Drinkwater, M J" uniqKey="Drinkwater M" first="M. J." last="Drinkwater">M. J. Drinkwater</name><affiliation wicri:level="4"><country xml:lang="fr">Australie</country><wicri:regionArea>2School of Physics, University of Melbourne, Victoria 3010</wicri:regionArea><orgName type="university">Université de Melbourne</orgName><placeName><settlement type="city">Melbourne</settlement><region type="état">Victoria (État)</region></placeName></affiliation></author><author><name sortKey="Combes, F" sort="Combes, F" uniqKey="Combes F" first="F." last="Combes">F. 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Wiklind</name><affiliation wicri:level="1"><country xml:lang="fr">Suède</country><wicri:regionArea>4Onsala Space Observatory, Onsala S‐43992</wicri:regionArea><wicri:noRegion>Onsala S‐43992</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="alt">MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><biblScope unit="vol">327</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="1244">1244</biblScope><biblScope unit="page" to="1248">1248</biblScope><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2001-11">2001-11</date></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption lines</term><term>Absorption spectra</term><term>Absorption system</term><term>Absorption systems</term><term>Carilli</term><term>Combes</term><term>Constraint</term><term>Data show</term><term>Different sightlines</term><term>Extra dimensions</term><term>Flambaum</term><term>Lett</term><term>Mnras</term><term>Molecular absorption</term><term>Molecular absorption lines</term><term>Molecular frequencies</term><term>Molecular transitions</term><term>Optical results</term><term>Optical studies</term><term>Other constraints</term><term>Phys</term><term>Physical constants</term><term>Possible variation</term><term>Qsos</term><term>Redshift</term><term>Solid line</term><term>Tted velocity components</term><term>Upper limit</term><term>Upper limits</term><term>Varshalovich</term><term>Varshalovich potekhin</term><term>Velocity components</term><term>Webb</term><term>Wiklind</term><term>Wiklind combes</term><term>line: profiles</term><term>quasars: absorption lines</term><term>quasars: individual: PKS 1413+135</term><term>quasars: individual: TXS 0218+357</term><term>techniques: spectroscopic</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Absorption lines</term><term>Absorption spectra</term><term>Absorption system</term><term>Absorption systems</term><term>Carilli</term><term>Combes</term><term>Constraint</term><term>Data show</term><term>Different sightlines</term><term>Extra dimensions</term><term>Flambaum</term><term>Lett</term><term>Mnras</term><term>Molecular absorption</term><term>Molecular absorption lines</term><term>Molecular frequencies</term><term>Molecular transitions</term><term>Optical results</term><term>Optical studies</term><term>Other constraints</term><term>Phys</term><term>Physical constants</term><term>Possible variation</term><term>Qsos</term><term>Redshift</term><term>Solid line</term><term>Tted velocity components</term><term>Upper limit</term><term>Upper limits</term><term>Varshalovich</term><term>Varshalovich potekhin</term><term>Velocity components</term><term>Webb</term><term>Wiklind</term><term>Wiklind combes</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H i 21‐cm absorption with corresponding molecular (rotational) absorption spectra allows us to constrain variation in , where α is the fine‐structure constant and gp is the proton g‐factor. We analyse spectra of two QSOs, PKS 1413+135 and TXS 0218+357, and derive values of at absorption redshifts of and 0.6847 by simultaneous fitting of the H i 21‐cm and molecular lines. We find and respectively, indicating an insignificantly smaller y in the past. We compare our results with other constraints from the same two QSOs given recently by Drinkwater et al. and Carilli et al., and with our recent optical constraints, which indicated a smaller α at higher redshifts.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Suède</li></country><region><li>Victoria (État)</li><li>Île-de-France</li></region><settlement><li>Melbourne</li></settlement><orgName><li>Université de Melbourne</li></orgName></list><tree><country name="Australie"><noRegion><name sortKey="Murphy, M T" sort="Murphy, M T" uniqKey="Murphy M" first="M. T." last="Murphy">M. T. Murphy</name></noRegion><name sortKey="Drinkwater, M J" sort="Drinkwater, M J" uniqKey="Drinkwater M" first="M. J." last="Drinkwater">M. J. Drinkwater</name><name sortKey="Flambaum, V V" sort="Flambaum, V V" uniqKey="Flambaum V" first="V. V." last="Flambaum">V. V. Flambaum</name><name sortKey="Murphy, M T" sort="Murphy, M T" uniqKey="Murphy M" first="M. T." last="Murphy">M. T. Murphy</name><name sortKey="Webb, J K" sort="Webb, J K" uniqKey="Webb J" first="J. K." last="Webb">J. K. Webb</name></country><country name="France"><region name="Île-de-France"><name sortKey="Combes, F" sort="Combes, F" uniqKey="Combes F" first="F." last="Combes">F. Combes</name></region></country><country name="Suède"><noRegion><name sortKey="Wiklind, T" sort="Wiklind, T" uniqKey="Wiklind T" first="T." last="Wiklind">T. Wiklind</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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