Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-29
Astron.Astrophys. 421 (2004) 59-70
Astronomy and Astrophysics
Astrophysics
15 pages, 12 figures. A&A in press
Scientific paper
10.1051/0004-6361:20041222
We present a spectroscopic analysis of two galaxy clusters out to ~4Mpc at z~0.2. The two clusters VMF73 and VMF74 identified by Vikhlinin et al. (1998) were observed with MOSCA at the Calar Alto 3.5m telescope. Both clusters lie in the ROSAT PSPC field R285 and were selected from the X-ray Dark Cluster Survey (Gilbank et al. 2004) that provides optical V- and I-band data. VMF73 and VMF74 are located at respective redshifts of z=0.25 and z=0.18 with velocity dispersions of 671 km/s and 442 km/s, respectively. The spectroscopic observations reach out to ~2.5 virial radii. Line strength measurements of the emission lines H_alpha and [OII]3727 are used to assess the star formation activity of cluster galaxies which show radial and density dependences. The mean and median of both line strength distributions as well as the fraction of star forming galaxies increase with increasing clustercentric distance and decreasing local galaxy density. Except for two galaxies with strong H_alpha and [OII] emission, all of the cluster galaxies are normal star forming or passive galaxies. Our results are consistent with other studies that show the truncation in star formation occurs far from the cluster centre.
Balogh Michael
Fritz Alexander
Gerken Bettina
Gilbank David
Jaeger Kellie
No associations
LandOfFree
Star formation activity of intermediate redshift cluster galaxies out to the infall regions 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 Star formation activity of intermediate redshift cluster galaxies out to the infall regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Star formation activity of intermediate redshift cluster galaxies out to the infall regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-240563