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J/ApJ/695/580              Oxygen abundance in M83             (Bresolin+, 2009)

The flat oxygen abundance gradient in the extended disk of M83. Bresolin F., Ryan-Weber E., Kennicutt R.C., Goddard Q. <Astrophys. J., 695, 580-595 (2009)> =2009ApJ...695..580B
ADC_Keywords: Abundances ; H II regions ; Galaxies, optical ; Spectroscopy ; Ultraviolet Keywords: galaxies: abundances - galaxies: individual (M83) - galaxies: ISM Abstract: We have obtained deep multiobject optical spectra of 49 HII regions in the outer disk of the spiral galaxy M83 (=NGC 5236) with the FORS2 spectrograph at the Very Large Telescope. The targets span the range in galactocentric distance between 0.64 and 2.64 times the R25 isophotal radius (5.4-22.3kpc), and 31 of them are located at R>R25, thus belonging to the extreme outer disk of the galaxy, populated by UV complexes revealed recently by the Galaxy Evolution Explorer satellite. In order to derive the nebular chemical abundances, we apply several diagnostics of the oxygen abundance, including R23, [NII]/[OII], and the [OIII]λ4363 auroral line, which was detected in four HII regions. Description: Candidate HII regions in the outer disk of M83 were selected from deep Hα images obtained at the 90 inch Bok telescope of the Steward Observatory with the 90 Prime camera. Several of these HII regions have a counterpart in the list of UV-emitting clusters detected by GALEX (Thilker et al. 2005ApJ...619L..79T; Gil de Paz et al. 2007ApJ...661..115G). Optical spectra were acquired with FORS2 at the Very Large Telescope of the European Southern Observatory on Paranal. Objects distributed in four nonoverlapping 6.8'x6.8' fields were observed in service mode between 2007 May 10 and 2007 June 19. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 38 49 HII region sample table2.dat 55 49 Reddening-corrected fluxes
See also: J/AJ/136/479 : IRAC observations of M83 extended UV disk (Dong+, 2008) J/ApJS/173/538 : XUV-Disk galaxies in the Local Universe (Thilker+, 2007) J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007) J/A+A/415/155 : Oxygen abundances in the Galactic disk (Bensby+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- ID HII region number 4- 5 I2 h RAh Hour of right ascension (J2000) 7- 8 I2 min RAm Minute of right ascension (J2000) 10- 14 F5.2 s RAs Second of right ascension (J2000) 16 A1 --- DE- Declination sign (J2000) 17- 18 I2 deg DEd Degree of declination (J2000) 20- 21 I2 arcmin DEm Arcminute of declination (J2000) 23- 26 F4.1 arcsec DEs Arcsecond of declination (J2000) 28- 31 F4.2 --- R/R25 Galactocentric distance in units of R25=6.44arcmin 33- 35 A3 --- --- [XUV] 37- 38 I2 --- XUV ? Gil de Paz et al. identification (2007ApJ...661..115G) (<[GMB2007] NGC 5236 XUV NN> in Simbad)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- ID HII region number 4- 7 I4 --- F[OII] ? [OII]3727 line flux in units of Hβ=100 9- 11 I3 --- e_F[OII] ? [OII]3727 uncertainty 13- 15 I3 --- F[OIII] Flux of [OIII]5007 line in units of Hβ=100 17- 18 I2 --- e_F[OIII] Uncertainty of [OIII]5007 20- 22 I3 --- F[NII] Flux of [NII]6583 line in units of Hα=286 24- 25 I2 --- e_F[NII] Uncertainty of [NII]6583 27- 29 I3 --- F[SII] Flux of [SII]6717+6731 lines in units of Hα=286 31- 32 I2 --- e_F[SII] Uncertainty of [SII]6717+6731 34- 37 F4.1 --- F[ArIII] ? Flux of [ArIII]7135 in units of Hα=286 39- 42 F4.1 --- e_F[ArIII] ? Uncertainty of [ArIII]7135 44- 50 E7.2 mW/m2 FHbeta Hβ line flux in erg/s/cm2 (1) 52- 55 F4.2 mag c(Hb) Extinction value (1)
Note (1): The extinction correction has been applied to F(Hβ) and the error on c(Hβ) has been propagated to the line fluxes.
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 29-Apr-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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