J/MNRAS/403/896 Line intensities of SDSS HII regions (Pilyugin+, 2010)
The electron temperatures of SDSS high-metallicity giant extragalactic HII regions. Pilyugin L.S., Vilchez J.M., Cedres B., Thuan T.X. <Mon. Not. R. Astron. Soc., 403, 896-905 (2010)> =2010MNRAS.403..896P
ADC_Keywords: H II regions ; Spectroscopy ; Abundances Keywords: ISM: abundances - HII regions - galaxies: abundances Abstract: 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 92 181 Dereddened line intensities and electron temperatures of a sample of HII regions in SDSS galaxies
See also: J/ApJS/153/429 : SDSS strong emission line HII galaxies (Kniazev+, 2004) http://www.sdss.org : SDSS Home Page Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/181] Sequential number 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 15 F5.2 s RAs Right ascension (J2000) 17 A1 --- DE- Declination sign (J2000) 18- 19 I2 deg DEd Declination (J2000) 21- 22 I2 arcmin DEm Declination (J2000) 24- 27 F4.1 arcsec DEs Declination (J2000) 29- 32 I4 --- Plate Spectrum SDSS Plate number 34- 38 I5 --- MJD Spectrum SDSS MJD number 40- 42 I3 --- Fiber Spectrum SDSS Fiber number 44- 48 F5.3 --- [OII]1 Line intensity of [OII]3727 (1) 50- 55 F6.4 --- [OIII]1 Line intensity of [OII]4363 (1) 57- 61 F5.3 --- [OIII]2 Line intensity of [OII]4959+5007 (1) 63- 67 F5.3 --- [SII]1 Line intensity of [SII]6717 (1) 69- 73 F5.3 --- [SII]2 Line intensity of [SII]6731 (1) 75- 80 F6.4 --- [OII]2 Line intensity of [OII]7325 (1) 82- 86 F5.3 10+4K t3,O Electron temperature within the [OIII] zone 88- 92 F5.3 10+4K t2,O Electron temperature within the [OII] zone
Note (1): The line intensities are given on a scale in which Hβ=1.
History: * 21-Oct-2010: From electronic version of the journal * 27-May-2011: Positions of objects No 10, 69, 102 and 179 corrected with SDSS positions based on MJD-Plate-Fiber.
(End) Patricia Vannier [CDS] 24-Sep-2010
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