2015ApJ...814...84D -
Astrophys. J., 814, 84 (2015/December-1)
Spectroscopic study of star-forming galaxies in filaments and the field at z ∼ 0.5: evidence for environmental dependence of electron density.
DARVISH B., MOBASHER B., SOBRAL D., HEMMATI S., NAYYERI H. and SHIVAEI I.
Abstract (from CDS):
We study the physical properties of a spectroscopic sample of 28 star-forming galaxies in a large filamentary structure in the COSMOS field at z ∼ 0.53, with spectroscopic data taken with the Keck/DEIMOS spectrograph, and compare them with a control sample of 30 field galaxies. We spectroscopically confirm the presence of a large galaxy filament (∼8 Mpc), along which five confirmed X-ray groups exist. We show that within the uncertainties, the ionization parameter, equivalent width (EW), EW versus specific star-formation rate (sSFR) relation, EW versus stellar mass relation, line-of-sight velocity dispersion, dynamical mass, and stellar-to-dynamical mass ratio are similar for filament and field star-forming galaxies. However, we show that, on average, filament star-forming galaxies are more metal enriched (∼0.1-0.15 dex), possibly owing to the inflow of the already-enriched intrafilamentary gas into filament galaxies. Moreover, we show that electron densities are significantly lower (a factor of ∼17) in filament star-forming systems compared to those in the field, possibly because of a longer star-formation timescale for filament star-forming galaxies. Our results highlight the potential pre-processing role of galaxy filaments and intermediate-density environments on the evolution of galaxies, which has been highly underestimated.
Abstract Copyright:
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Journal keyword(s):
galaxies: abundances - galaxies: evolution - galaxies: fundamental parameters - galaxies: starburst - large-scale structure of universe
Simbad objects:
3
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