Colour asymmetry between galaxies with clockwise and counterclockwise handedness

Abstract

Recent studies have shown that SDSS galaxies with clockwise patterns are photometrically different from galaxies with anti-clockwise patterns. The purpose of this study is to identify possible differences between the colour of galaxies with clockwise handedness and the colour of galaxies with anti-clockwise handedness. A dataset of 162,514 SDSS galaxies was separated into clockwise and counterclockwise galaxies, and the colours of spiral galaxies with clockwise handedness were compared to the colour of spiral galaxies with anti-clockwise handedness. The results show that the i-r colour in clockwise galaxies in SDSS is significantly higher compared to anti-clockwise SDSS galaxies. The colour difference is strongest between the right ascension of 30 o and 60 o , while the RA range of 180 o to 210 o shows a much smaller difference.

Asymmetry between galaxies with different spin patterns: A comparison between COSMOS, SDSS, and Pan-STARRS

“…That provided a dataset of 114,630 galaxies. The galaxy images were then classified by their spin pattern (clockwise and counterclockwise) as was done in (Shamir 2016(Shamir , 2017a. The classification was done by first applying the Ganalyzer algorithm (Shamir 2011a).…”

“…The spin pattern of a spiral galaxy is a matter of the perspective of the observer, and therefore galaxies with clockwise spin patterns are expected to be identical in their characteristics to galaxies with counterclockwise spin patterns. However, recent Earth-based observations using large datasets of galaxy images have shown evidence of statistically significant difference between the photometry of spiral galaxies with clockwise spin patterns and spiral galaxies with counterclockwise spin patterns (Shamir 2013(Shamir , 2016(Shamir , 2017a. The photometric difference between spiral galaxies that rotate in opposite directions was first observed by identifying subtle color differences between clockwise and counterclockwise galaxies (Shamir 2013).…”

“…The most likely axis around which the asymmetry is oriented is (α = 175 ∘ , δ = 50 ∘ ), which is roughly aligned with the galactic pole at (α 192 ∘ , δ 27 ∘ ). Data for all of these experiments are publicly available (Shamir 2016(Shamir , 2017a.…”

“…While the previous experiments showed that the brightness and color differences between galaxies with opposite spin patterns exist in the entire sky as observed from Earth (Shamir 2013(Shamir , 2016(Shamir , 2017a, this paper is focused on a certain part of the sky, but imaged by three different telescopes. Two of these telescopes are ground-based, and one is space-based.…”

Energy bounds in f(R,G) gravity with anisotropic background

“…Santos et al [34] studied energy conditions in f (R) gravity and explored the NEC using Raychaudhri metric. Shamir [35] contributed by discussing the dynamics of f (G) gravity in the light of energy conditions with anisotropic background. Sharif and Fatima [36] evaluated energy conditions for Biachi type I universe in f (G) gravity and discussed energy conditions in modified Guass-Bonnet gravity for LRS Biachi type I universe model with perfect fluid.…”