Improved constraints on possible variation of physical constants from H i 21-cm and molecular QSO absorption lines
Identifieur interne : 000C74 ( Istex/Curation ); précédent : 000C73; suivant : 000C75Improved 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 ] ; 2001-11-11.
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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.
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DOI: 10.1046/j.1365-8711.2001.04843.x
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M. T. Murphy<affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: mim@phys.unsw.edu.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation>Le document en format XML
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Soc.</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="2001-11-11">2001-11-11</date><biblScope unit="volume">327</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="1244">1244</biblScope><biblScope unit="page" to="1248">1248</biblScope></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>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></textClass></profileDesc></teiHeader><front><div type="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.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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