A large sample of low surface brightness disc galaxies from the SDSS- II. Metallicities in surface brightness bins

Details A large sample of low surface brightness disc galaxies from the SDSS- II. Metallicities in surface brightness bins A large sample of low surface brightness disc galaxies from the SDSS- II. Metallicities in surface brightness bins

2010-04-21

arxiv.org/abs/1004.3683v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 11 figures, accepted for publication in MNRAS

Scientific paper

We study the spectroscopic properties of a large sample of Low Surface Brightness galaxies (LSBGs) (with B-band central surface brightness mu0(B)>22 mag arcsec^(-2)) selected from the Sloan Digital Sky Survey Data Release 4 (SDSS-DR4) main galaxy sample. A large sample of disk-dominated High Surface Brightness galaxies (HSBGs, with mu0(B)<22 mag arcsec^(-2)) are also selected for comparison simultaneously. To study them in more details, these sample galaxies are further divided into four subgroups according to mu0(B) (in units of mag arcsec^(-2)): vLSBGs (24.5-22.75),iLSBGs (22.75-22.0), iHSBGs (22.0-21.25), and vHSBGs (<21.25). The diagnostic diagram from spectral emission-line ratios shows that the AGN fractions of all the four subgroups are small (<9%). The 21,032 star-forming galaxies with good quality spectroscopic observations are further selected for studying their dust extinction, strong-line ratios, metallicities and stellar mass-metallicities relations. The vLSBGs have lower extinction values and have less metal-rich and massive galaxies than the other subgroups. The oxygen abundances of our LSBGs are not as low as those of the HII regions in LSBGs studied in literature, which could be because our samples are more luminous, and because of the different metallicity calibrations used. We find a correlation between 12+log(O/H) and mu0(B) for vLSBGs, iLSBGs and iHSBGs but show that this could be a result of correlation between mu0(B) and stellar mass and the well-known mass-metallicity relation. This large sample shows that LSBGs span a wide range in metallicity and stellar mass, and they lie nearly on the stellar mass vs. metallicity and N/O vs. O/H relations of normal galaxies. This suggests that LSBGs and HSBGs have not had dramatically different star formation and chemical enrichment histories.

Affiliated with

Also associated with

No associations

Rating

A large sample of low surface brightness disc galaxies from the SDSS- II. Metallicities in surface brightness bins does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A large sample of low surface brightness disc galaxies from the SDSS- II. Metallicities in surface brightness bins, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A large sample of low surface brightness disc galaxies from the SDSS- II. Metallicities in surface brightness bins will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-326939