Sodium excess objects. I. SDSS-DR7 : J/ApJS/208/7


Authors : Jeong H. orcid , Yi S.K., Kyeong J. (hide) , Yi S.K., Kyeong J. et..al

Bibcode : 2013ApJS..208....7J (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Abundances; Galaxies, spectra; Photometry, SDSS; Morphology; Redshifts
UAT : Chemical abundances, Galaxies, Spectroscopy, Optical astronomy, Sloan photometry, Galaxy classification systems, Redshifted

Observation (OC)

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Inserted into VizieR : 28-Oct-2013
Last modification : 12-Nov-2013

On the nature of sodium excess objects. I. Data and observed trends. (2013)

Keywords : catalogs - galaxies abundances - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: spiral - galaxies: stellar content

Abstract:Several studies have reported the presence of sodium excess objects having neutral atomic absorption lines at 5895{AA} (Na.D) and 8190{AA} that are deeper than expected based on stellar population models that match the stellar continuum. The origin of these lines is therefore hotly debated. van Dokkum & Conroy (2010Natur.468..940V) proposed that low-mass stars (<~0.3M_{sun}_) are more prevalent in massive early-type galaxies, which may lead to a strong Na I 8190 line strength. It is necessary to test this prediction, however, against other prominent optical line indices such as Na.D, Mg b, and Fe 5270, which can be measured with a significantly higher signal-to-noise ratio than Na I 8190. We identified a new sample of roughly 1000 Na.D ...(more)
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  • II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
  • J/A+A/445/79 : Nearby early-type gal. with ionized gas. II. (Annibali+, 2006)
  • J/A+A/433/497 : Nearby early-type gal. with ionized gas. I. (Rampazzo+, 2005)

                
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