Journal Article

The electron temperatures of SDSS high-metallicity giant extragalactic H <span class="smallCaps">ii</span> regions

L. S. Pilyugin, J. M. Vílchez, B. Cedrés and T. X. Thuan

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 403, issue 2, pages 896-905
Published in print April 2010 | ISSN: 0035-8711
Published online March 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.16166.x
The electron temperatures of SDSS high-metallicity giant extragalactic H ii regions

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Spectra of high-metallicity [12+log(O/H) ≳ 8.2] H ii regions, where oxygen auroral lines are measurable in both the O+ and O++ zones, have been extracted from the Data Release 6 of the Sloan Digital Sky Survey (SDSS). Our final sample consists of 181 SDSS spectra of H ii regions in galaxies in the redshift range from ∼0.025 to ∼0.17. The t2,Ot3,O diagram is examined. In the SDSS H ii regions, the electron temperature t2,O is found to have a large scatter at a given value of the electron temperature t3,O. The majority of the SDSS H ii regions lie below the t2,Ot3,O relation derived for H ii regions in nearby galaxies, i.e. the positions of the SDSS H ii regions show a systematic shift towards lower t2,O temperatures or/and towards higher t3,O temperatures. The scatter and shift of the SDSS H ii regions in the t2,Ot3,O diagram can be understood if they are composite nebulae excited by two or more ionizing sources of different temperatures.

Keywords: ISM: abundances; H ii regions; galaxies: abundances

Journal Article.  7573 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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