Spatially resolved STIS spectra of the gravitationally lensed broad absorption line quasar APM08279+5255: the nature of component C and evidence for microlensing
Identifieur interne : 000115 ( Istex/Curation ); précédent : 000114; suivant : 000116Spatially resolved STIS spectra of the gravitationally lensed broad absorption line quasar APM08279+5255: the nature of component C and evidence for microlensing
Auteurs : Geraint F. Lewis [Australie] ; Rodrigo A. Ibata [France, Australie] ; Sara L. Ellison [Chili, Australie] ; Bastien Aracil [France, Australie] ; Patrick Petitjean [France, Australie] ; Max Pettini [Australie] ; Raghunathan Srianand [Inde, Australie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2002-07-21.
Abstract
While gravitationally lensed quasars are expected to display an odd number of images, invariably systems are observed with an even number of quasars. For this, lensing galaxies must have very small core radii; this provides strong demagnification of one of the images. High-resolution imaging of the gravitationally lensed broad absorption line (BAL) quasar, APM08279+5255, reveals three point-like images. As these images possess similar colours, it has been suggested that each represents a lensed image. Here, spatially resolved spectra of the individual components, obtained with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST), are presented, clearly revealing that each is an image of the quasar. This confirms that APM08279+5255 represents the first example of an odd-image gravitationally lensed system. The implications for the properties of the lensing galaxy are discussed. It is also found that the individual images possess spectral differences indicative of the influence of gravitational microlensing in this system.
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DOI: 10.1046/j.1365-8711.2002.05700.x
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line quasar APM08279+5255: the nature of component C and evidence for microlensing</title><author><name sortKey="Lewis, Geraint F" sort="Lewis, Geraint F" uniqKey="Lewis G" first="Geraint F." last="Lewis">Geraint F. Lewis</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Ibata, Rodrigo A" sort="Ibata, Rodrigo A" uniqKey="Ibata R" first="Rodrigo A." last="Ibata">Rodrigo A. Ibata</name><affiliation wicri:level="1"><mods:affiliation>Observatoire de Strabourg, 11, rue de l'Universite, F-67000, Strasbourg, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Strabourg, 11, rue de l'Universite, F-67000, Strasbourg</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Ellison, Sara L" sort="Ellison, Sara L" uniqKey="Ellison S" first="Sara L." last="Ellison">Sara L. Ellison</name><affiliation wicri:level="1"><mods:affiliation>European Southern Observatory, Casilla 19001, Santiago 19, Chile</mods:affiliation><country xml:lang="fr">Chili</country><wicri:regionArea>European Southern Observatory, Casilla 19001, Santiago 19</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Aracil, Bastien" sort="Aracil, Bastien" uniqKey="Aracil B" first="Bastien" last="Aracil">Bastien Aracil</name><affiliation wicri:level="1"><mods:affiliation>Institut d'Astrophysique de Paris – CNRS, 98bis Boulevard Arago, F-75014 Paris, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Institut d'Astrophysique de Paris – CNRS, 98bis Boulevard Arago, F-75014 Paris</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Petitjean, Patrick" sort="Petitjean, Patrick" uniqKey="Petitjean P" first="Patrick" last="Petitjean">Patrick Petitjean</name><affiliation wicri:level="1"><mods:affiliation>Institut d'Astrophysique de Paris – CNRS, 98bis Boulevard Arago, F-75014 Paris, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Institut d'Astrophysique de Paris – CNRS, 98bis Boulevard Arago, F-75014 Paris</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Pettini, Max" sort="Pettini, Max" uniqKey="Pettini M" first="Max" last="Pettini">Max Pettini</name><affiliation><mods:affiliation>Institute of Astronomy, Madingley Rd, Cambridge CB3 0HA</mods:affiliation></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Srianand, Raghunathan" sort="Srianand, Raghunathan" uniqKey="Srianand R" first="Raghunathan" last="Srianand">Raghunathan Srianand</name><affiliation wicri:level="1"><mods:affiliation>IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, India</mods:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: gfl@aaoepp.aao.gov.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Mon. Not. R. Astron. Soc.</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Science Ltd</publisher><date type="published" when="2002-07-21">2002-07-21</date><biblScope unit="volume">334</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="L7">L7</biblScope><biblScope unit="page" to="L10">L10</biblScope></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">While gravitationally lensed quasars are expected to display an odd number of images, invariably systems are observed with an even number of quasars. For this, lensing galaxies must have very small core radii; this provides strong demagnification of one of the images. High-resolution imaging of the gravitationally lensed broad absorption line (BAL) quasar, APM08279+5255, reveals three point-like images. As these images possess similar colours, it has been suggested that each represents a lensed image. Here, spatially resolved spectra of the individual components, obtained with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST), are presented, clearly revealing that each is an image of the quasar. This confirms that APM08279+5255 represents the first example of an odd-image gravitationally lensed system. The implications for the properties of the lensing galaxy are discussed. It is also found that the individual images possess spectral differences indicative of the influence of gravitational microlensing in this system.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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