Testing Metallicity Indicators at Z ~ 1.4 with the Gravitationally Lensed Galaxy CASSOWARY 20*

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dc.contributor.ISNI0000 0001 2437 3571 (King, LJ)
dc.contributor.authorJames, Bethan L.en_US
dc.contributor.authorPettini, Maxen_US
dc.contributor.authorChristensen, Liseen_US
dc.contributor.authorAuger, Matthew W.en_US
dc.contributor.authorBecker, George D.en_US
dc.contributor.authorKing, Lindsay J.en_US
dc.contributor.authorQuider, Anna M.en_US
dc.contributor.authorShapley, Alice E.en_US
dc.contributor.authorSteidel, Charles C.en_US
dc.contributor.utdAuthorKing, Lindsay J.en_US
dc.date.accessioned2014-10-06T19:25:34Z
dc.date.available2014-10-06T19:25:34Z
dc.date.created2014-03-27en_US
dc.date.issued2014-03-27en_US
dc.description.abstractWe present X-shooter observations of CASSOWARY 20 (CSWA 20), a star-forming (SFR ~ 6 M⊙ yr⁻¹) galaxy at z = 1.433, magnified by a factor of 11.5 by the gravitational lensing produced by a massive foreground galaxy at z = 0.741. We analysed the integrated physical properties of the H II regions of CSWA 20 using temperature- and density-sensitive emission lines. We find the abundance of oxygen to be ~1/7 of solar, while carbon is ~50 times less abundant than in the Sun. The unusually low C/O ratio may be an indication of a particularly rapid time-scale of chemical enrichment. The wide wavelength coverage of X-shooter gives us access to five different methods for determining the metallicity of CSWA 20, three based on emission lines from H II regions and two on absorption features formed in the atmospheres of massive stars. All five estimates are in agreement, within the factor of ~2 uncertainty of each method. The interstellar medium (ISM) of CSWA 20 only partially covers the star-forming region as viewed from our direction; in particular, absorption lines from neutrals and first ions are exceptionally weak. We find evidence for large-scale outflows of the ISM with speeds of up 750 km s⁻¹, similar to the values measured in other high-z galaxies sustaining much higher rates of star formation.en_US
dc.identifier.bibliographicCitationJames, Bethan L., Max Pettini, Lise Christensen, Matthew W. Auger, et al. 2014. "Testing metallicity indicators at z ~ 1.4 with the gravitationally lensed galaxy CASSOWARY 20*." Monthly Notices of the Royal Astronomical Society 440(2): 10.1093/mnras/stu287en_US
dc.identifier.issn0035-8711en_US
dc.identifier.issue2en_US
dc.identifier.startpage1794en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4081
dc.identifier.volume440en_US
dc.publisherOxford University Pressen_US
dc.relation.urihttp://dx.doi.org/10.1093/mnras/stu287
dc.rights©2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Societyen_US
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectCassowariesen_US
dc.subjectMetallicityen_US
dc.subjectEmission-line galaxiesen_US
dc.subjectCassowary 20en_US
dc.subjectGravitational lensesen_US
dc.titleTesting Metallicity Indicators at Z ~ 1.4 with the Gravitationally Lensed Galaxy CASSOWARY 20*en_US
dc.type.genreArticleen_US

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