SIMBAD references

2017MNRAS.464..530S - Mon. Not. R. Astron. Soc., 464, 530-552 (2017/January-1)

H I observations of galaxies in the southern filament of the Virgo Cluster with the Square Kilometre Array Pathfinder KAT-7 and the Westerbork Synthesis Radio Telescope.


Abstract (from CDS):

We map the H I distribution of galaxies in a ∼1.5 x 2.5° region located at the virial radius south of the Virgo Cluster using the KAT-7 and the Westerbork Synthesis Radio Telescope interferometers. Because of the different beam sizes of the two telescopes, a similar column density sensitivity of N_H I_ ∼ 1 x 1018 atoms cm^- 2^ was reached with the two observations over 16.5 km s–1. We pioneer a new approach to combine the observations and take advantage of their sensitivity to both the large- and small-scale structures. Out to an unprecedented extent, we detect an H I tail of ∼60 kpc being stripped off NGC 4424, a peculiar spiral galaxy. The properties of the galaxy, together with the shape of the tail, suggest that NGC 4424 is a post-merger galaxy undergoing ram pressure stripping as it falls towards the centre of the Virgo Cluster. We detect a total of 14 galaxies and three H I clouds lacking optical counterparts. One of the clouds is a new detection with an H I mass of 7 x 107 M and a strong H I profile with W50 = 73 km s–1. We find that 10 out of the 14 galaxies present H I deficiencies not higher than those of the cluster's late spirals, suggesting that the environmental effects are not more pronounced in the region than elsewhere in the cluster.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: interferometric - galaxies: clusters - individual: Virgo - galaxies: individual: NGC 4424 - galaxies: ISM - galaxies: ISM

Simbad objects: 46

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