Chiral Property of Spiral and Barred Spiral Galaxies in the Local Supercluster |
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| Authors: | B Aryal S R Acharya W Saurer |
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| Institution: | (1) Central Department of Physics, Tribhuvan University, Kathmandu, Nepal;(2) Institute of Astrophysics, Innsbruck University, Technikstrasse 25/8, A-6020 Innsbruck, Austria |
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| Abstract: | We present an analysis of the chiral property of 667 spiral and barred spiral galaxies in the Local Supercluster (radial velocity
<3 000 km s−1). The arms of a galaxy (spiral or barred spiral) can be distinguished according to their orientation (leading or trailing)
relative to the direction of the rotation. We use environment of each galaxy as a subsample in order to study the chiral property
of galaxies. In addition, equatorial position angle distributions of leading and trailing arm galaxies are studied. We classify
our database according as their morphology, diameters, radial velocities, axial ratios and magnitudes. The distribution of
trailing and leading arm galaxies in the Local Supercluster is found homogeneous. A significant dominance of either trailing
or leading structures is noticed within the Virgo cluster region, suggesting that the aggregation of these structures might
have already started there. The rotation axes of the galaxies in the Virgo cluster is found to lie in the equatorial plane.
Chirality of galaxies is found strong for the subsamples that showed a random alignment in the equatorial position angle distribution.
Possible explanations of the results will be presented. |
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| Keywords: | Spiral galaxies Hubble sequence Chirality Clusters: Individual (Local Supercluster) |
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