A decrease of the gas exchanges between galaxies and the IGM, from 12 to 6 billion years ago

Details A decrease of the gas exchanges between galaxies and the IGM, from 12 to 6 billion years ago A decrease of the gas exchanges between galaxies and the IGM, from 12 to 6 billion years ago

2012-03-28

arxiv.org/abs/1203.6248v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Scientific paper

10.1111/j.1365-2966.2012.20518.x

Using a representative sample of 65 intermediate mass galaxies at z \sim 0.6, we have inves- tigated the interplay between the main ingredients of chemical evolution: metal abundance, gas mass, stellar mass and SFR. All quantities have been estimated using deep spectroscopy and photometry from UV to IR and assuming an inversion of the Schmitt-Kennicutt law for the gas fraction. Six billion years ago, galaxies had a mean gas fraction of 32% \pm 3, i.e. twice that of their local counterparts. Using higher redshift samples from the literature, we explore the gas-phases and estimate the evolution of the mean gas fraction of distant galaxies over the last 11 Gy. The gas fraction increases linearly at the rate of 4% per Gyr from z \sim 0 to z \sim 2.2. We also demonstrate for a statistically representative sample that < 4% of the z \sim 0.6 galaxies are undergoing outflow events, in sharp contrast with z \sim 2.2 galaxies. The observed co-evolution of metals and gas over the past 6 Gyr favours a scenario in which the population of intermediate mass galaxies evolved as closed-systems, converting their own gas reservoirs into stars.

Affiliated with

Also associated with

No associations

Rating

A decrease of the gas exchanges between galaxies and the IGM, from 12 to 6 billion years ago 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 decrease of the gas exchanges between galaxies and the IGM, from 12 to 6 billion years ago, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A decrease of the gas exchanges between galaxies and the IGM, from 12 to 6 billion years ago will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-272692