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

Aryal, B.; Acharya, Sushan; Saurer, W.

doi:10.1007/s10509-006-9287-5

Cited by 11 publications

(31 citation statements)

References 38 publications

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“…It has been argued that this may be the cause of the handedness of biologically active molecules such as amino acids and sugars. On the other end of the scale, it seems that galaxies exhibit a certain handedness [10][11][12], which is two-dimensional when spiral galaxies are projected onto a plane. More left handed spirals seem to be observed in the northern sky, while the southern sky shows more right handed ones.…”

Section: Chiralitymentioning

confidence: 99%

Chiral Liquid Crystals: Structures, Phases, Effects

2014

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The introduction of chirality, i.e., the lack of mirror symmetry, has a profound effect on liquid crystals, not only on the molecular scale but also on the supermolecular scale and phase. I review these effects, which are related to the formation of supermolecular helicity, the occurrence of novel thermodynamic phases, as well as electro-optic effects which can only be observed in chiral liquid crystalline materials. In particular, I will discuss the formation of helical superstructures in cholesteric, Twist Grain Boundary and ferroelectric phases. As examples for the occurrence of novel phases the Blue Phases and Twist Grain Boundary phases are introduced. Chirality related effects are demonstrated through the occurrence of ferroelectricity in both thermotropic as well as lyotropic liquid crystals. Lack of mirror symmetry is also discussed briefly for some biopolymers such as cellulose and DNA, together with its influence on liquid crystalline behavior.

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Section: Chiralitymentioning

confidence: 99%

Chiral Liquid Crystals: Structures, Phases, Effects

2014

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“…The percentage differences (∆%) between the total leading and trailing arm galaxies are found to be less than 5% in the LSC (subsample T1), nearby LSC (subsample T2) and total galaxies (subsample T3). Aryal et al (2007a) noticed chiral symmetry violation in the Virgo cluster region. This violation leads the LSC spirals (S1) to give ∆ > 5%.…”

Section: Preferred Alignmentmentioning

confidence: 99%

“…These findings are interesting in the context of the Virgo cluster. Aryal et al (2007a) noticed two groups of galaxies in the Virgo cluster region. In these groups, the dominance of trailing and leading structural modes are found.…”

Section: Lsc Galaxies (Rv ≤ 3000 Km Smentioning

confidence: 99%

“…No significant dominance (∆ > ±10%) of either face-on or edge-on leading or trailing arm galaxies is noticed when the database of LSC (Aryal et al 2007a) and nearby LSC galaxies was added (Table 2). A dominance of trailing and leading modes are noticed for the low (m < 13) and high magnitude (m < 15) galaxies, respectively.…”

Section: Lsc Galaxies (Rv ≤ 3000 Km Smentioning

confidence: 99%

“…In addition, they predicted that the progressive loss of chirality might have some connection with the rotationally-supported (spirals, barred spirals) and randomized systems (lenticulars, ellipticals). Aryal et al (2007a) carried out a study to test Capozziello & Lattanzi's (2006) prediction regarding the progressive loss of chirality in the large scale structure. They concluded the existence of chiral symmetry for both the spirals and the barred spirals in the Local Supercluster (LSC).…”

Section: Introductionmentioning

confidence: 99%

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Coexistence of chiral symmetry restoration and random orientation of galaxies

Aryal

Paudel

Saurer

2007

A&A

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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.

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Chiral habit selection on nanostructured epitaxial quartz films

et al. 2015

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Understanding the crystallization of enantiomorphically pure systems can be relevant to diverse fields such as the study of the origins of life or the purification of racemates. Here we report on polycrystalline epitaxial thin films of quartz on Si substrates displaying two distinct types of chiral habits that never coexist in the same film. We combine Atomic Force Microscopy (AFM) analysis and computer-assisted crystallographic calculations to make a detailed study of these habits of quartz. By estimating the surface energies of the observed crystallites we argue that the films are enantiomorphically pure and we briefly outline a possible mechanism to explain the habit and chiral selection in this system.

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

Cited by 11 publications

References 38 publications

Chiral Liquid Crystals: Structures, Phases, Effects

Chiral Liquid Crystals: Structures, Phases, Effects

Coexistence of chiral symmetry restoration and random orientation of galaxies

Chiral habit selection on nanostructured epitaxial quartz films

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