2005MNRAS.362.1143M

Query : 2005MNRAS.362.1143M

2005MNRAS.362.1143M - Mon. Not. R. Astron. Soc., 362, 1143-1156 (2005/October-1)

The [OII]λ3727/Hα ratio of emission-line galaxies in the 2dF Galaxy Redshift Survey.

MOUHCINE M., LEWIS I., JONES B., LAMAREILLE F., MADDOX S.J. and CONTINI T.

Abstract (from CDS):

We investigate the systematic variation of the [Oii]λ3727/Hα flux line ratio as a function of various galaxy properties, i.e. luminosity, metallicity, reddening and excitation state, for a sample of 1124 emission-line galaxies, with a mean redshift z∼ 0.06, drawn from the 2dF Galaxy Redshift Survey. The mean observed and extinction-corrected emission-line flux ratios agree well with the values derived from the B-band selected Nearby Field Galaxy Survey galaxy sample, but are significantly different from the values obtained from the Hα-selected Universidad Complutense de Madrid Survey galaxy sample. This is because the different selection criteria applied in these surveys lead to a significant difference in the mean extinction and metallicity of different samples.

We use the R₂₃parameter to estimate the gas-phase oxygen abundance and find that the extinction-corrected [Oii]λ3727/Hα ratio depends on the oxygen abundance. For 12 + log(O/H) ≳ 8.4, we confirm that the emission-line ratio decreases with increasing metallicity. We have extended the relationship further to the metal-poor regime, 12 + log(O/H) ≲ 8.4, and find that the correlation between the extinction-corrected [Oii]λ3727/Hα ratio and the metallicity reverses in comparison to the relationship for metal-rich galaxies. For metal-poor galaxies, in contrast with metal-rich galaxies, the variation of extinction-corrected [Oii]λ3727/Hα ratio is correlated with the ionization states of the interstellar gas.

The relative importance of the metallicity or the excitation state in determining the extinction-corrected [Oii]λ3727/Hα ratio depends on galaxy luminosity.

Abstract Copyright: 2005 RAS

Journal keyword(s): surveys - galaxies: fundamental parameters - galaxies: general - galaxies: statistics

VizieR on-line data: <Available at CDS (J/MNRAS/362/1143): Data never received at CDS>

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NAME SGP	reg	00 51 26.275	-27 07 41.70						~	606	0

Query : 2005MNRAS.362.1143M

Basic data :

NAME SGP -- Region defined in the Sky
Other object types:	`reg ([SFD98])`
ICRS coord. (ep=J2000) :	`00 51 26.275 -27 07 41.70 [ ] D ~`
FK4 coord. (ep=B1950 eq=1950) :	`00 49 00.001 -27 24 00.17 [ ]`
Gal coord. (ep=J2000) :	`148.040683 -89.999997 [ ]`

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NAME SGP NAME South Galactic Pole [SFD98] J0051-2708

References (606 between 1850 and 2026) (Total 606)
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