- ID:
- ivo://CDS.VizieR/J/A+A/479/1
- Title:
- Redshifts and morphology in A3667
- Short Name:
- J/A+A/479/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The galaxy cluster A3667 was observed using the Two-degree Field (2dF) multifibre spectroscopic system on the Anglo-Australian Telescope in a program designed to examine the velocity structure in the region. Specifically, we sought evidence from the optical data for the putative cluster merger believed to be responsible for the observed radio and X-ray emission. We present 184 new redshifts in the region, of which 143 correspond to member galaxies of A3667. We find the cluster velocity distribution to be well modelled by a single Gaussian in agreement with previous results. In addition, new redshift-selected isodensity plots significantly reduce the prominence of the previously reported subgroup to the north-west of the main cluster. Instead, we find the galaxy distribution to be elongated and well mixed, with a high velocity dispersion and no significant evidence for substructure. These results are consistent with the axis of the proposed merger being close to the plane of the sky.
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- ID:
- ivo://CDS.VizieR/J/AJ/132/347
- Title:
- Redshifts and photometry in Centaurus cluster
- Short Name:
- J/AJ/132/347
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We acquired spectra for a random sample of galaxies within a 0.83deg^2^ region centered on the core of the Centaurus Cluster. Radial velocities were obtained for 225 galaxies to limiting magnitudes of V<19.5. Of the galaxies for which velocities were obtained, we find 35% to be member galaxies. New redshifts are obtained for 15 Centaurus Cluster members, many of them dwarf galaxies. Radial velocities for the other members agree well with those from previous studies. Of the 78 member galaxies, magnitudes range over 11.8<V<18.5 (-21.6<M_V_<-14.9 for H0=70km/s/Mpc), with a limiting central surface brightness of {mu}0<22.5mag/arcsec^2^. While many of these galaxies are giants, about 25 galaxies with M_V_>-17.0 are considered dwarfs. We constructed the cluster galaxy luminosity function (LF) by using these spectroscopic results to calculate the expected fraction of cluster members in each magnitude bin. The faint-end slope of the LF using this method is shallower than the one obtained using a statistical method to correct for background galaxy contamination. We also use the spectroscopy results to define surface brightness criteria to establish membership for the full sample. Using these criteria, we find a LF very similar to the one constructed with the statistical background correction.
- ID:
- ivo://CDS.VizieR/J/A+A/492/345
- Title:
- Redshifts and SDSS photometry of A1942 galaxies
- Short Name:
- J/A+A/492/345
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a dynamical analysis of the galaxy cluster Abell 1942 based on a set of 128 velocities obtained at the European Southern Observatory. Data on individual galaxies are presented and the accuracy of the determined velocities as some properties of the cluster are discussed. We have also made use of publicly available Chandra X-ray data.
- ID:
- ivo://CDS.VizieR/VII/177
- Title:
- Redshifts and Velocity Dispersions for Abell Clusters
- Short Name:
- VII/177
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog presents a list of redshifts for 758 Abell clusters, and velocity dispersions for 121, published as of 1991 March. We present another list of 33 Abell clusters with published redshifts, most of which are probably redshifts of foreground or background galaxies superposed on, or near, the Abell clusters. Over the past 4 years, the published number of redshifts of member galaxies in clusters increased by a factor of 2.0, but the number of cluster redshifts increased by only a factor of 1.3, while the number of cluster velocity dispersions derived from 50 or more redshifts of member galaxies increased by a factor of 3.8 (from 6 to 23).
- ID:
- ivo://CDS.VizieR/VII/56
- Title:
- Redshifts for Abell Clusters
- Short Name:
- VII/56
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog gives redshifts for 329 Abell clusters, all those known to the authors in published or preprint form at the time of the compilation (through 1982). The data table has been compiled critically, based partially on a number of photometric distance estimators derived from the redshift data. These were used to evaluate probable accuracies of the redshifts and to resolve discrepancies among different values for the same clusters. The catalog includes Abell (1958) cluster numbers, redshifts, and the number of redshifts of different galaxies averaged to determine the cluster value. The machine version was prepared at the Astronomical Data Center, NASA/GSFC. Note that Struble and Rood published further compilations in 1987 (1987ApJS...63..543S) and 1991 (1991ApJS...77..363S). Other redshift compilations are also available in electronic form (see "See also" section below).
- ID:
- ivo://CDS.VizieR/VII/71
- Title:
- Redshifts for Zwicky's Near Clusters
- Short Name:
- VII/71
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog contains a list of redshifts for Zwicky's Near Clusters. All of the 503 Zwicky Near Clusters as given in the Uppsala General Catalogue of Galaxies (UGC) are listed and radial velocity information for those that have at least one galaxy with published redshift positioned within the contours given in the Zwicky catalog is provided. Redshifts of galaxies belonging to clusters is obtained from the catalog of Radial Velocities of Galaxies. The catalog includes UGC cluster numbers, Zwicky field numbers, contour numbers, positions, heliocentric cluster radial velocities, and notes.
837. Redshifts in A2125
- ID:
- ivo://CDS.VizieR/J/ApJ/613/841
- Title:
- Redshifts in A2125
- Short Name:
- J/ApJ/613/841
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 371 galaxy velocities in the field of the very rich cluster A2125 (z~0.25). These were determined using optical spectroscopy collected over several years from both the WIYN 3.5m telescope and NOAO Mayall 4m telescope. Prior studies at a variety of wavelengths (radio, optical, and X-ray) have indicated that A2125 is a likely cluster-cluster merger, a scenario that we are able to test using our large velocity database. We identified 224 cluster galaxies, which were subjected to a broad range of statistical tests using both positional and velocity information to evaluate the cluster dynamics and substructure. The tests confirmed the presence of substructures within the A2125 system at high significance, demonstrating that A2125 is a complex dynamical system. Comparison of the test results with existing simulations strengthens the merger hypothesis and provides clues about the merger geometry and stage. The merger model for the system can reconcile A2125's low X-ray temperature and luminosity with its apparently high richness and might also explain A2125's high fraction of active galaxies identified in prior radio and optical studies.
- ID:
- ivo://CDS.VizieR/J/AJ/123/1216
- Title:
- Redshifts in A3128/A3125
- Short Name:
- J/AJ/123/1216
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Multifiber spectroscopy has been obtained for 335 galaxies in the field of the double cluster A3128/A3125, using the 2dF multifiber positioner on the Anglo-Australian Telescope. When combined with previously published results, a total of 532 objects in the double cluster now have known redshifts. We have also obtained a 20ks Chandra ACIS-I image of the central 16'x16' of A3128 and radio imaging of the cluster with the Molonglo Observatory Synthesis Telescope and the Australia Telescope Compact Array. The spatial/kinematic distribution of redshifts in the field of A3128/A3125, when combined with the Chandra ACIS-I image of A3128, reveals a variety of substructures present in the galaxy distribution and in the hot intracluster medium (ICM).
- ID:
- ivo://CDS.VizieR/J/A+A/548/A18
- Title:
- Redshifts in A1413 cluster center
- Short Name:
- J/A+A/548/A18
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We investigate the morphology and dynamics of the massive nearby galaxy cluster Abell 1413. Using wide field imaging and spectroscopic data obtained from observations at the Canada-France-Hawaii Telescope and archival SDSS data, we build a sample of more than 250 galaxies covering a region centered on the cluster and extending to its outskirts on large scales.
- ID:
- ivo://CDS.VizieR/J/AJ/119/44
- Title:
- Redshifts in AWM 7 galaxy cluster
- Short Name:
- J/AJ/119/44
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have measured 492 redshifts (311 new) in the direction of the poor cluster AWM 7 and have identified 179 cluster members (73 new).
