Multi - object spectroscopy of low redshift EIS clusters . I . ⋆
نویسندگان
چکیده
We report the results of the first multi-object spectroscopic observations at the Danish 1.54m telescope at La Silla, Chile. Observations of five cluster candidates from the ESO Imaging Survey Cluster Candidate Catalog are described. From these observations we confirm the reality of the five clusters with measured redshifts of 0.11 ≤ z ≤ 0.35. We estimate velocity dispersions in the range 294–621 km/s indicating rather poor clusters. This, and the measured cluster redshifts are consistent with the results of the matched filter procedure applied to produce the Cluster Candidate Catalog.
منابع مشابه
Multi - object spectroscopy of low redshift EIS clusters . II . ⋆
We present the results of carrying out multi-object spectroscopy in 10 EIS cluster fields. Based on the list of 345 galaxy redshifts we identify significant 3D-density enhancements. For 9 of the EIS clusters we identify significant 3D-concentrations corresponding to the originally detected cluster candidate. We find redshifts in the range 0.097 ≤ z ≤ 0.257 which is in good agreement with the ma...
متن کاملConfirming EIS Clusters . Multi - object Spectroscopy
Clusters of galaxies arise from exceptionally high peaks of the primordial fluctuation density field. Their properties as a function of redshift, z, are therefore highly sensitive to the nature of such cosmic fluctuations. It is therefore very important to have a sample of galaxy clusters covering as wide a redshift range as possible. Recently, Olsen et al. (1999) and Scodeggio et al. (1999) ha...
متن کاملMulti - object spectroscopy of low redshift EIS clusters . III . Properties of optically selected clusters ⋆
We have carried out an investigation of the properties of low redshift EIS clusters using both spectroscopy and imaging data. We present new redshifts for 738 galaxies in 21 ESO Imaging Survey (EIS) Cluster fields. We use the " gap "-technique to search for significant overdensities in redshift space and to identify groups/clusters of galaxies corresponding to the original EIS matched filter cl...
متن کاملBuilding a Sample of Distant Clusters of Galaxies
Candidate clusters of galaxies drawn from the sample identified from the moderately deep I−band data of the ESO Imaging Survey (EIS), have been used for follow-up optical/infrared imaging and spectroscopic observations. The observations were conducted to assess the nature of these candidates over a large range of redshifts. Currently, 163 EIS candidates have (V − I) colors, 15 have (I −K) and 6...
متن کاملOn the Nature of the EIS Candidate Clusters : Confirmation of z . 0 . 6 candidates
We use publicly available V-band imaging data from the wide-angle surveys conducted by the ESO Imaging Survey project (EIS) to further investigate the nature of the EIS galaxy cluster candidates. These were originally identified by applying a matched-filter algorithm which used positional and photometric data of the galaxy sample extracted from the I-band survey images. In this paper, we apply ...
متن کامل