Line intensities of SDSS HII regions (Pilyugin+, 2010)

Details Line intensities of SDSS HII regions (Pilyugin+, 2010) Line intensities of SDSS HII regions (Pilyugin+, 2010)

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ycat..74030896p&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/403/896. Originally published in: 2010MNRAS.403..896P

Computer Science

H Ii Regions, Spectroscopy, Abundances

Scientific paper

Spectra of high-metallicity [12+log(O/H)>~8.2] HII 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 HII regions in galaxies in the redshift range from ~0.025 to ~0.17. The t2,O-t3,O diagram is examined. In the SDSS HII 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 HII regions lie below the t2,O-t3,O relation derived for HII regions in nearby galaxies, i.e. the positions of the SDSS HII regions show a systematic shift towards lower t2,O temperatures or/and towards higher t3,O temperatures. The scatter and shift of the SDSS HII regions in the t2,O-t3,O diagram can be understood if they are composite nebulae excited by two or more ionizing sources of different temperatures.
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