Bibcode
Pilyugin, L. S.; Vilchez, J. M.; Cedres, B.; Thuan, T. X.
Referencia bibliográfica
VizieR On-line Data Catalog: J/MNRAS/403/896. Originally published in: 2010MNRAS.403..896P
Fecha de publicación:
9
2010
Número de citas
0
Número de citas referidas
0
Descripción
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.
(1 data file).