Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-08
Astronomy and Astrophysics
Astrophysics
22 pages, 16 figures, accepted by ApJ
Scientific paper
10.1086/511669
We present K-band imaging for 15 of the Canadian Network for Observational Cosmology (CNOC1) clusters. The cluster luminosity density and number density profiles can be described by NFW models with concentration parameters of c_{l} = 4.28 \pm 0.70 and c_{g} = 4.13 \pm 0.57 respectively. Comparing these to the dynamical mass analysis of the same clusters shows that the galaxy luminosity and number density profiles are similar to the dark matter profile, and are not less concentrated like in local clusters. The luminosity functions show that the evolution of K^{*} over the redshift range 0.2 < z < 0.5 is consistent with a scenario where the majority of stars in cluster galaxies form at high-redshift (z_{f} > 1.5) and evolve passively thereafter. The best-fit for the faint-end slope of the luminosity function is alpha = -0.84 pm 0.08, which indicates that it does not evolve between z = 0 and z = 0.3. Using Principal Component Analysis of the spectra we classify cluster galaxies as either star-forming/recently-star-forming (EM+BAL) or non-starforming (ELL) and compute their respective luminosity functions. The faint-end slope of the ELL luminosity function is much shallower than for the EM+BAL galaxies at z = 0.3, and suggests the number of faint ELL galaxies in clusters decreases by a factor of ~3 from z = 0 to z = 0.3. The redshift evolution of K^{*} for both EM+BAL and ELL types is consistent with a passively evolving stellar population formed at high-redshift. Passive evolution in both classes, as well as the total cluster luminosity function, demonstrates that the bulk of the stellar population in all bright cluster galaxies is formed at high-redshift and subsequent transformations in morphology/color/spectral-type have little effect on the total stellar mass.
Ellingson Erica E.
Hall Patrick B.
Lin Hainan
Muzzin Adam
Yee Howard K. C.
No associations
LandOfFree
Near-Infrared Properties of Moderate-Redshift Galaxy Clusters: Luminosity Functions and Density Profiles 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 Near-Infrared Properties of Moderate-Redshift Galaxy Clusters: Luminosity Functions and Density Profiles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-Infrared Properties of Moderate-Redshift Galaxy Clusters: Luminosity Functions and Density Profiles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-572028