J/A+A/486/9         Galaxy populations in z 0.25 clusters       (Verdugo+, 2008)
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Beginning of ReadMe : J/A+A/486/9 Redshifts in z 0.25 clusters (Verdugo+, 2008) ================================================================================ The galaxy populations from the centers to the infall regions in z 0.25 clusters. Verdugo M., Ziegler B.L., Gerken B. <Astron. Astrophys. 486, 9 (2008)> =2008A&A...486....9V ================================================================================ ADC_Keywords: Clusters, galaxy ; Redshifts ; Galaxies, photometry ; Equivalent widths Keywords: galaxies: general - galaxies: evolution - galaxies: fundamental parameters - galaxies: clusters: general Abstract: We investigate the relation between star-formation activity and environment in six intermediate redshift clusters (z 0.25) out to large clustercentric distances ( 4R_vir_). For that, we conducted a panoramic spectroscopic campaign with MOSCA at the Calar Alto observatory. We acquired spectra of more than 500 objects. Approximately 150 of these spectra were of galaxies that are members of the clusters. Other  150 are field galaxies or galaxies belonging to groups, serendipitously found during the investigation. The rest of the spectra did not met the quality criteria or were stars. The wavelength range allows us to quantify the star formation activity by using the [OII] and the Halpha lines. This activity is examined in terms of the large-scale environment expressed by the clustercentric distance of the galaxies as well as on local scales given by the spatial galaxy densities. The suppression of the star-formation activity is observed at large clustercentric distances and low projected densities. Galaxies with current star-formation show similar activity, regardless of the environment, Therefore, the decline of the star-formation activity inside the investigated clusters is driven mainly by the significant change in the fraction of active versus passive populations. This suggests that the suppression of the star-formation activity occurs on short timescales. We also detect a significant population of red star-forming galaxies whose colors are consistent with the red-sequence of passive galaxies. They appear to be in an intermediate evolutionary stage between active and passive types. Description: We present measurements for all objects for which we were able to derive secure redshifts. This includes galaxies belonging to the six aforementioned clusters, four serendipitously found groups and the general field (see the paper and below). For each object, table3.dat provides the identification code, membership, right ascension and declination (J2000.0); redshift, I-band magnitude and V-I color from Gilbank et al. (2004MNRAS.348..551G); B and R-band absolute magnitude derived with k-correct (Blanton and Roweis, 2007AJ....133..734B); stellar mass also derived using k-correct and the equivalent widths of the [OII] and the Halpha emission lines and associated errors. Objects are sorted by membership to facilitate any specific search. The clusters studied are the following: VMF194 or RX J1729.0+7440; XDCS220, short for XDCS cmJ172333+744410; VMF131 or RX J1309.9+3222; VMF132 or RX J1313.2+3229; VMF73 or RX J0943.5+1640; VMF74 or RX J0943.7+1644; Galaxies belonging to the groups candidates are tagged with a group number which corresponds to one of the following identifications: group1 is r220_1J 172604+742830; group2 is r220_2J 172518+742844; group3 is r220_3J 172958+744204; group4 is r265_1J 131030+322840. Galaxies without any identifiable membership are tagged as belonging to the field.