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2011MNRAS.416.2437H - Mon. Not. R. Astron. Soc., 416, 2437-2446 (2011/October-1)
Quantified H I morphology – IV. The merger fraction and rate in WHISP.
HOLWERDA B.W., PIRZKAL N., DE BLOK W.J.G., BOUCHARD A., BLYTH S.-L. and VAN DER HEYDEN K.J.
Abstract (from CDS):
Based on their H I morphology, we find that 13 per cent of the WHISP galaxies are in an interaction (Concentration–M20) and only 7 per cent are based on close companions in the data cube. This apparent discrepancy can be attributed to the difference in visibility time-scales: mergers are identifiable as close pairs for 0.5 Gyr but are identifiable for ∼1 Gyr by their disturbed H I morphology. Expressed as volume merger rates, the two estimates agree very well: 7 and 6.8 {x} 10–3 mergers/Gyr/Mpc3 for paired and morphologically disturbed H I discs, respectively.
The consistency of our merger fractions with those published for bigger surveys such as the Sloan Digital Sky Survey shows that H I morphology can be a very viable way to identify mergers in large H I surveys. The relatively high value for the volume merger rate may be a bias in the selection or WHISP volume. The expected abundance in high-resolution H I data by the planned South African Karoo Array Telescope (MeerKAT), Australian SKA Pathfinder (ASKAP) and Westerbork Synthesis Radio Telescope/APERture Tile In Focus instrument (WSRT/APERTIF) radio observatories will reveal the importance of mergers in the local Universe and, with the advent of the Square Kilometer Array (SKA), over cosmic times.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: fundamental parameters - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure
VizieR on-line data: <Available at CDS (J/MNRAS/416/2437): tablea1.dat>
Simbad objects: 42
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