Reddening and metallicity maps of the Milky Way bulge from VVV and 2MASS

Reddening and metallicity maps of the Milky Way bulge from VVV and 2MASS

Aims. We investigate the large-scale metallicity distribution in the Galactic bulge using large spatial coverage to constrain the bulge formation scenario. Methods. We use the VISTA variables in the Via Lactea (VVV) survey data and 2MASS photometry, which cover 320 sqdeg of the Galactic bulge, to de...

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Veröffentlicht in:Astronomy and astrophysics (Berlin) 2013-04, Vol.552
Hauptverfasser: Gonzalez, O. A., Rejkuba, M., Zoccali, M., Valent, E., Minniti, D., Tobar, R.
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Galaxy: abundances
Galaxy: bulge
Galaxy: formation
stars: abundances
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container_title Astronomy and astrophysics (Berlin)
container_volume 552
creator Gonzalez, O. A.
Rejkuba, M.
Zoccali, M.
Valent, E.
Minniti, D.
Tobar, R.
description Aims. We investigate the large-scale metallicity distribution in the Galactic bulge using large spatial coverage to constrain the bulge formation scenario. Methods. We use the VISTA variables in the Via Lactea (VVV) survey data and 2MASS photometry, which cover 320 sqdeg of the Galactic bulge, to derive photometric metallicities by interpolating the (J − Ks)0 colors of individual red giant branch stars based on a set of globular cluster ridge lines. We then use this information to construct the first global metallicity map of the bulge with a resolution of 30′ × 45′. Results. The metallicity map of the bulge revealed a clear vertical metallicity gradient of ~0.04 dex/deg (~0.28 dex/kpc), with metal-rich stars ([Fe/H] ~ 0) dominating the inner bulge in regions closer to the Galactic plane (|b| 
doi_str_mv 10.1051/0004-6361/201220842
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A. ; Rejkuba, M. ; Zoccali, M. ; Valent, E. ; Minniti, D. ; Tobar, R.</creator><creatorcontrib>Gonzalez, O. A. ; Rejkuba, M. ; Zoccali, M. ; Valent, E. ; Minniti, D. ; Tobar, R.</creatorcontrib><description>Aims. We investigate the large-scale metallicity distribution in the Galactic bulge using large spatial coverage to constrain the bulge formation scenario. Methods. We use the VISTA variables in the Via Lactea (VVV) survey data and 2MASS photometry, which cover 320 sqdeg of the Galactic bulge, to derive photometric metallicities by interpolating the (J − Ks)0 colors of individual red giant branch stars based on a set of globular cluster ridge lines. We then use this information to construct the first global metallicity map of the bulge with a resolution of 30′ × 45′. Results. The metallicity map of the bulge revealed a clear vertical metallicity gradient of ~0.04 dex/deg (~0.28 dex/kpc), with metal-rich stars ([Fe/H] ~ 0) dominating the inner bulge in regions closer to the Galactic plane (|b| &lt; 5). At larger scale heights, the mean metallicity of the bulge population becomes significantly more metal poor. Conclusions. This fits in the scenario of a boxy bulge originating from the vertical instability of the Galactic bar, formed early via secular evolution of a two-component stellar disk. 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The metallicity map of the bulge revealed a clear vertical metallicity gradient of ~0.04 dex/deg (~0.28 dex/kpc), with metal-rich stars ([Fe/H] ~ 0) dominating the inner bulge in regions closer to the Galactic plane (|b| &lt; 5). At larger scale heights, the mean metallicity of the bulge population becomes significantly more metal poor. Conclusions. This fits in the scenario of a boxy bulge originating from the vertical instability of the Galactic bar, formed early via secular evolution of a two-component stellar disk. 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A.</creator><creator>Rejkuba, M.</creator><creator>Zoccali, M.</creator><creator>Valent, E.</creator><creator>Minniti, D.</creator><creator>Tobar, R.</creator><general>EDP Sciences</general><scope>BSCLL</scope></search><sort><creationdate>201304</creationdate><title>Reddening and metallicity maps of the Milky Way bulge from VVV and 2MASS</title><author>Gonzalez, O. A. ; Rejkuba, M. ; Zoccali, M. ; Valent, E. ; Minniti, D. ; Tobar, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c218t-ae9b1b5f6341853be7a6a2ce1a8c3c2aacfae0801e47747c3d73ee5b48e62a253</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Galaxy: abundances</topic><topic>Galaxy: bulge</topic><topic>Galaxy: formation</topic><topic>stars: abundances</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gonzalez, O. A.</creatorcontrib><creatorcontrib>Rejkuba, M.</creatorcontrib><creatorcontrib>Zoccali, M.</creatorcontrib><creatorcontrib>Valent, E.</creatorcontrib><creatorcontrib>Minniti, D.</creatorcontrib><creatorcontrib>Tobar, R.</creatorcontrib><collection>Istex</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gonzalez, O. A.</au><au>Rejkuba, M.</au><au>Zoccali, M.</au><au>Valent, E.</au><au>Minniti, D.</au><au>Tobar, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Reddening and metallicity maps of the Milky Way bulge from VVV and 2MASS</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>2013-04</date><risdate>2013</risdate><volume>552</volume><issn>0004-6361</issn><eissn>1432-0746</eissn><abstract>Aims. We investigate the large-scale metallicity distribution in the Galactic bulge using large spatial coverage to constrain the bulge formation scenario. Methods. We use the VISTA variables in the Via Lactea (VVV) survey data and 2MASS photometry, which cover 320 sqdeg of the Galactic bulge, to derive photometric metallicities by interpolating the (J − Ks)0 colors of individual red giant branch stars based on a set of globular cluster ridge lines. We then use this information to construct the first global metallicity map of the bulge with a resolution of 30′ × 45′. Results. The metallicity map of the bulge revealed a clear vertical metallicity gradient of ~0.04 dex/deg (~0.28 dex/kpc), with metal-rich stars ([Fe/H] ~ 0) dominating the inner bulge in regions closer to the Galactic plane (|b| &lt; 5). At larger scale heights, the mean metallicity of the bulge population becomes significantly more metal poor. Conclusions. This fits in the scenario of a boxy bulge originating from the vertical instability of the Galactic bar, formed early via secular evolution of a two-component stellar disk. Older metal-poor stars dominate at higher scale heights due to the non-mixed orbits of originally hotter thick disk stars.</abstract><pub>EDP Sciences</pub><doi>10.1051/0004-6361/201220842</doi><oa>free_for_read</oa></addata></record>
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subjects Galaxy: abundances
Galaxy: bulge
Galaxy: formation
stars: abundances
title Reddening and metallicity maps of the Milky Way bulge from VVV and 2MASS
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