Exploring star formation using the filaments in the Sloan Digital Sky Survey Data Release Five (SDSS DR5)

Abstract

We have quantified the average filamentarity of the galaxy distribution in seven nearly two dimensional strips from the SDSS DR5 using a volume limited sample in the absolute magnitude range -21 < M_r < -20. The average filamentarity of star forming (SF) galaxies, which are predominantly blue, is found to be more than that of other galaxies which are predominantly red. This difference is possibly an outcome of the fact that blue galaxies have a more filamentary distribution. Comparing the SF galaxies with only the blue other galaxies, we find that the two show nearly equal filamentarity. Separately analyzing the galaxies with high star formation rates (SFR) and low SFR, we find that the latter has a more filamentary distribution. We interpret this in terms of two effects (1.) A correlation between the SFR and individual galaxy properties like luminosity with the high SFR galaxies being more luminous (2.) A relation between the SFR and environmental effects like the density with the high SFR galaxies preferentially occurring in high density regions. These two effects are possibly not independent and are operating simultaneously. We do not find any difference in the filamentarity of SF galaxies and AGNs.

6 pages, 3 figures, Final accepted version in MNRAS, in press

References in corpus (7)

• Theory of Star Formation
• The H$\alpha$ Luminosity Function and Star Formation Rate at $z\approx 0.24$ in the Cosmos 2 Square-Degree Field
• Star formation in galaxies along the Pisces-Cetus Supercluster filaments
• Superclusters of galaxies in the 2dF redshift survey. III. The properties of galaxies in superclusters
• The environments and clustering properties of 2dFGRS-selected starburst galaxies
• The luminosity bias relation from filaments in the Sloan Digital Sky Survey Data Release Four
• Connecting the Physical Properties of Galaxies with the Overdensity and Tidal Shear of the Large-Scale Environment

Cited by in corpus (3)

• The spin and orientation of dark matter halos within cosmic filaments
• The Variation of Galaxy Morphological Type with the Shear of Environment
• The Local Dimension: a method to quantify the Cosmic Web