Evolution of the Blue Luminosity-to-Baryon Mass Ratio of Clusters of Galaxies

Details Evolution of the Blue Luminosity-to-Baryon Mass Ratio of Clusters of Galaxies Evolution of the Blue Luminosity-to-Baryon Mass Ratio of Clusters of Galaxies

2000-01-31

arxiv.org/abs/astro-ph/0001521v1

Astronomy and Astrophysics

Astrophysics

10 pages, LaTeX (PASJ2.sty, PASJ95.sty, PASJadd.sty), 10 PostScript figures, accepted for publication in PASJ

Scientific paper

We derive the ratio of total blue luminosity to total baryon mass, LB/Mb, for massive (Mgas at the Abell radius is \ge 1 \times 10^{13} h^{-2.5} \Msolar) clusters of galaxies up to z \simeq 1 from the literature. Twenty-two clusters in our sample are at z > 0.1. Assuming that the relative mix of hot gas and galaxies in clusters does not change during cluster evolution, we use LB/Mb to probe the star formation history of the galaxy population as a whole in clusters. We find that LB/Mb of clusters increases with redshift from LB/Mb=0.024 (solar units) at z = 0 to \simeq 0.06 at z=1, indicating a factor of 2-3 brightening (we assume H0=70 km/s/Mpc). This amount of brightening is almost identical to the brightening of the M/LB ratio of early-type galaxies in clusters at 0.02 \le z \le 0.83 reported by van Dokkum et al. (1998). We compare the observed brightening of LB/Mb with luminosity evolution models for the galaxy population as a whole, changing the e-folding time of star formation \tau by 0.1 \le \tau \le 5 Gyr and the formation redshift \zF by 2 \le \zF < \infty. We find that \tau=0.1 Gyr 'single burst' models with \zF \ge 3 and \tau=5 Gyr 'disk' models with arbitrary \zF are consistent with the observed brightening, while models with \tau=1-2 Gyr tend to predict too steep brightening. We also derive the ratio of blue luminosity density to baryon density for field galaxies, adopting \Omega_b h^2 = 0.02, and find that blue luminosity per unit baryon is similar in clusters and in fields up to z \simeq 1 within the observational uncertainties.

Affiliated with

Also associated with

No associations

Rating

Evolution of the Blue Luminosity-to-Baryon Mass Ratio of Clusters of Galaxies 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 Evolution of the Blue Luminosity-to-Baryon Mass Ratio of Clusters of Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of the Blue Luminosity-to-Baryon Mass Ratio of Clusters of Galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-204344