Spin vector orientations of galaxies in seven Abell clusters of BM type III

Acharya

Saurer

2007

Astrophys Space Sci

Self Cite

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.

“…We have used a database of 5398 LSC galaxies (RV < 3000 km s −1 ) compiled by Aryal and Saurer (2005a). They used 20 catalogues for the compilation.…”

Section: The Sample: Data Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chiral Property of Spiral and Barred Spiral Galaxies in the Local Supercluster

Acharya

Saurer

2007

Astrophys Space Sci

Self Cite

“…6. A random simulation for 10 7 virtual particles (i.e, galaxies) carried out successfully by using 4 GB RAM pc. We intend to carry out simulation generating 10 8 virtual galaxies in order to find out sufficiently smooth expected isotropic distribution curves in the future.…”

Section: Resultsmentioning

confidence: 99%

A Study of r- and u-Magnitude Dependence in the Spatial Orientation of Spin Vectors of SDSS Galaxies having redshift 0.10 < z < 0.11

Yadav

2015

Himalayan Physics

“…However, the Virgo cluster galaxies show a preferred alignment: the galactic rotation axes of leading and trailing structures are found to lie in the equatorial plane. Aryal & Saurer (2005a) noticed a preferred alignment for the late-type spirals and barred spirals in the LSC. In addition, they found that the spin vector (SV) projections of early-and late-type spirals show opposite alignment.…”

Section: Introductionmentioning

confidence: 99%

“…No significant dominance from a random distribution is noticed. Aryal & Saurer (2005a) studied the spatial orientations of SVs of 4073 galaxies in the LSC. No preferred alignment is found.…”

Section: Winding Sense Of Spiralsmentioning

confidence: 99%

Coexistence of chiral symmetry restoration and random orientation of galaxies

Paudel

Saurer

2007

A&A

Self Cite

We studied the chiral symmetry restoration and the spatial orientation of 2288 spiral and spiral barred galaxies that have radial velocities (RV) less than 5000 km s −1 . A random direction of the rotation of galaxies is assumed in order to classify the structural modes. The distribution of spin vector and spin vector projections of leading and trailing arm galaxies in the total sample and subsamples are studied. We use chi-square, auto-correlation and Fourier tests in order to discriminate the preferred alignments from the random alignments. A good correlation between the random alignment and the chiral symmetry is noticed in the Local Supercluster (RV < 3000 km s −1 ) and in galaxies nearby the Local Supercluster (3000 < RV (km s −1 ) ≤ 5000). Spiral galaxies show a similar result. The barred spirals show an opposite trend to that observed for the spirals. Nearby the Local Supercluster, we noticed a preferred spatial alignment and non-chiral property in the leading and trailing arm spiral barred galaxies. Our result predicts that the progressive loss of chirality might have some connection with the rotationally supported (spirals, barred spirals) and randomized (lenticulars, ellipticals) systems. Thus, we suspect that the dynamical processes in the cluster evolution give rise to a dynamical loss of chirality.