Galaxy clusters in the Vela supercluster. -- I. Deep NIR catalogues

Abstract

We present six deep Near-InfraRed (JHK_s) photometric catalogues of galaxies identified in six cluster candidates (VC02, VC04, VC05, VC08, VC10, VC11) within the Vela Supercluster (VSCL) as part of our efforts to learn more about this large supercluster which extends across the zone of avoidance (l=272.5 \pm 20 deg, b= \pm 10 deg, at cz~ 18000 km/s). The observations were conducted with the InfraRed Survey Facility (IRSF), a 1.4m telescope situated at the South African Astronomical Observatory (SAAO) in Sutherland. The images in each cluster cover ~ 80% of their respective Abell radii. We identified a total number of 1715 galaxies distributed over the six cluster candidates, of which only ~ 15% were previously known. We study the structures and richnesses of the six clusters out to the cluster-centric completeness radius of r_c<1.5 Mpc and magnitude completeness limit of K_s^0<15.5 mag, using their iso-density contour maps and radial density profiles. The analysis shows VC04 to be the richest of the six. It is a massive cluster comparable to the Coma and Norma clusters, although its velocity dispersion, sigma=455 km/s, seems rather low for a rich cluster. VC02 and VC05 are found to be relatively rich clusters while VC08 is rather poor. Also, VC05 has the highest central number density among the six. VC11 is an intermediate cluster that contains two major subclusters while VC10 has a filament-like structure and is likely not to be a cluster after all.

18 pages, 10 Figures, 13 Tables. Accepted for publication in MNRAS

References in corpus (15)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The peculiar velocity field up to $z\sim 0.05$ by forward-modeling Cosmicflows-3 data
• Deep Near-IR Surface Photometry of 57 Galaxies in the Local Sphere of Influence
• A New Approach to the Study of Stellar Populations in Early-Type Galaxies: K-band Spectral Indices and an Application to the Fornax Cluster
• Superclusters of galaxies from the 2dF redshift survey. II. Comparison with simulations
• The Norma Cluster (ACO 3627): I. A Dynamical Analysis of the Most Massive Cluster in the Great Attractor
• Discovery of a supercluster in the ZOA in Vela
• Early-type galaxies in the near-infrared: 1.5-2.4\mum spectroscopy
• Dynamical Constraints on the Local Group from the CMB and 2MRS Dipoles
• The highly obscured region around PKS1343-601 - I. Galactic interstellar extinctions using DENIS galaxy colours
• The Shape, Multiplicity, and Evolution of Superclusters in LambdaCDM Cosmology
• Deep NIR photometry of HI galaxies in the Zone of Avoidance
• Predicting Structures in the Zone of Avoidance
• Galaxy peculiar velocities in the Zone of Avoidance
• The Mass Distribution of the Great Attractor as Revealed by a Deep NIR Survey