126 member galaxies of A780 radial velocities : J/A+A/658/A159

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Authors : Girardi M. orcid , Boschin W., Nonino M. (hide) , Boschin W., Nonino M. et..al

VizieR DOI : 10.26093/cds/vizier.36580159
Bibcode : 2022A&A...658A.159G (ADS) (Simbad) (Objects)
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CDS Keywords : Clusters, galaxy; Redshifts; Spectroscopy; Radial velocities; Optical
UAT : Galaxy clusters, Redshifted, Spectroscopy, Radial velocity, Optical astronomy

Observation (OC)

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Inserted into VizieR : 16-Feb-2022
Last modification : 12-Oct-2022

Accretion processes in the galaxy cluster Hydra A/Abell 780. (2022)

Keywords : galaxies clusters: individual: Abell 780 - galaxies: clusters: general - galaxies: kinematics and dynamics - galaxies: clusters: individual: Hydra A

Abstract:Clusters of galaxies evolve and accrete mass, mostly from small galaxy systems. Our aim is to study the velocity field of the galaxy cluster Abell 780, which is known for the powerful radio source Hydra A at its center and where a spectacular X-ray tail associated with the galaxy LEDA 87445 has been discovered. Our analysis is based on the new spectroscopic data for hundreds of galaxies obtained with the Italian Telescopio Nazionale Galileo and the Very Large Telescope. We have constructed a redshift catalog of 623 galaxies and selected a sample of 126 cluster members. We analyze the internal structure of the cluster using a number of techniques. We estimate the mean redshift z=0.0545, the line-of-sight velocity dispersion {sigma}_v_~800km/s, ...(more)
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Astronomy and Astrophysics policies
The table contains radial velocities of 126 member galaxies of the galaxy cluster A780. Multi-object spectroscopic observations in the field of A780 were carried out at the the Italian Telescopio Nazionale Galileo (TNG) in June 2016 and at the Very Large Telescope (VLT-ESO) in January, February, and March 2017. At TNG we used the instrument Device Optimized for the Low Resolution (DOLORES) in multi-object spectroscopy (MOS) mode with the LR-B Grism. In total, we observed five MOS masks for a total of 194 slits. The total exposure time was 3600s for each of the five masks. At VLT we used the instrument VIMOS in MOS mode with the LR-blue grism. In total, we observed three MOS mask pointing for a total of 1407 slits. The total exposure time was six hours, distributed over three pointings. We combined new velocities with those from literature (Smith et al. 2004AJ....128.1558S, Cat. J/AJ/128/1558).
Marisa Girardi, marisa.girardi(at)inaf.it

                


                

                    

                


                

                    

                


                

                    
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