Asymmetry in Galaxy Spin Directions -- Analysis of Data from DES and Comparison to Four Other Sky Surveys

Shamir, Lior

doi:10.20944/preprints202207.0396.v1

Cited by 7 publications

(9 citation statements)

References 211 publications

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“…As a model-driven method, it is not based on any kind of machine learning, and therefore it is not subjected to possible biases in the training data. Te simple "mechanical" nature of the Ganalyzer allows it to be fully symmetric [6,11].…”

Section: Datamentioning

confidence: 99%

“…Previous work using diferent telescopes showed that the spin directions of spiral galaxies form a statistically significant large-scale axis [12]. Tat was carried out by ftting the spin directions to the cosine of the angle between the galaxies and every possible integer (α, δ) combination in the sky [11], as shown in the following equation:…”

Section: Identifcation Of a Possible Dipole Axis Alignmentmentioning

confidence: 99%

“…In addition to SDSS, other telescopes also showed parity violations in the distribution of the spin direction of spiral galaxies. Tese include Pan-STARRS [4], DECam [6], Hubble Space Telescope [10], the Dark Energy Survey [11], and the DESI Legacy Survey [12]. Tese telescopes cover both the northern and southern hemispheres, and the Hubble Space Telescope provides analysis that is not subjected to a possible efect of the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…Reasons can include datasets that are not sufciently large or biases in the data that their corrections require modifcations to the data. Tese reasons are summarized in Section 2, and a more detailed discussion can be found in [11,17,18].…”

Section: Introductionmentioning

confidence: 99%

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Reanalysis of the Spin Direction Distribution of Galaxy Zoo SDSS Spiral Galaxies

Mcadam

Shamir

2023

Advances in Astronomy

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The distribution of the spin directions of spiral galaxies in the Sloan Digital Sky Survey has been a topic of debate in the past two decades, with conflicting conclusions reported even in cases where the same data were used. Here, we follow one of the previous experiments by applying the SpArcFiRe algorithm to annotate the spin directions in an original dataset of Galaxy Zoo 1. The annotation of the galaxy spin directions is carried out after the first step of selecting the spiral galaxies in three different manners: manual analysis by Galaxy Zoo classifications, by a model-driven computer analysis, and with no selection of spiral galaxies. The results show that when spiral galaxies are selected by Galaxy Zoo volunteers, the distribution of their spin directions as determined by SpArcFiRe is not random, which agrees with previous reports. When selecting the spiral galaxies using a model-driven computer analysis or without selecting the spiral galaxies at all, the distribution is also not random. Simple binomial distribution analysis shows that the probability of the parity violation to occur by chance is lower than 0.01. Fitting the spin directions as observed from the Earth to cosine dependence exhibits a dipole axis with statistical strength of 2.33 σ to 3.97 σ . These experiments show that regardless of the selection mechanism and the analysis method, all experiments show similar conclusions. These results are aligned with previous reports using other methods and telescopes, suggesting that the spin directions of spiral galaxies as observed from the Earth exhibit a dipole axis formed by their spin directions. Possible explanations can be related to the large-scale structure of the universe or to the internal structure of galaxies. The catalogs of annotated galaxies generated as part of this study are available.

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Section: Datamentioning

confidence: 99%

Section: Identifcation Of a Possible Dipole Axis Alignmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reanalysis of the Spin Direction Distribution of Galaxy Zoo SDSS Spiral Galaxies

Mcadam

Shamir

2023

Advances in Astronomy

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“…If so, thinking about the universe without a center of rotation is illogical. Based on this logic, we appeal the science community to see the possibility of thinking about angular velocity, cosmic rotation and rotational axis [38][39][40][41][42][43].…”

Section: On Cosmic Rotation and Cosmic Centermentioning

confidence: 99%

Light Speed Expanding Hubble-Hawking Universe

U.V¹,

Lakshmanarayana²

2022

Preprint

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Based on three major cosmological and astrophysical coincidences, it seems possible to develop a new model of Hubble-Hawking Universe having light speed expansion. First Coincidence is - distance travelled by light in 14 billion years seems to equal to the currently believed cosmic Hubble radius. Second Coincidence is - Product of currently believed cosmic critical density and cosmic Hubble volume seems to be equal to the black hole mass of the current Hubble universe. Third Coincidence is - Currently believed cosmic temperature seems to be equal to the geometric mean of Hawking temperature of Planck mass and Hawking temperature of current Hubble mass. Considering the analysis of 740 super novae data, it is possible to consider a constant rate of cosmic expansion. As there is no physical reasoning for the observed speed of light and all the cosmological observations are completely based on speed of light-by considering ‘light speed expansion’ concept as a characteristic nature of the universe, big bang, inflation, dark energy, quintessence and lambda term like ideal and unidentified concepts can be reviewed and relinquished at fundamental level and a practical model of expanding universe can be developed with ease and clarity. In this context, we encourage the reader to see Figure 1 pertaining to light travel distances prepared with [z/(1+z)](c/H0). For a comparison, readers are encouraged to visit https://cosmocalc.icrar.org/ and http://www.atlasoftheuniverse.com/cosmodis.c. It may be noted that, considering 200 million solar masses as a cut off for ordinary gravity, dark matter can be considered as an effect of power law based super gravity of galactic baryonic mass. It is well believed that, Hawking’s findings about black holes are the most important contributions to physics in recent decades. Hence, we appeal the science community to recommend our Hubble-Hawking model for further research and study.

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A Rotating Model of a Light Speed Expanding Hubble-Hawking Universe

U.V¹,

Lakshminarayana

2023

The 2nd Electronic Conference on Universe

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Asymmetry in Galaxy Spin Directions -- Analysis of Data from DES and Comparison to Four Other Sky Surveys

Cited by 7 publications

References 211 publications

Reanalysis of the Spin Direction Distribution of Galaxy Zoo SDSS Spiral Galaxies

Reanalysis of the Spin Direction Distribution of Galaxy Zoo SDSS Spiral Galaxies

Light Speed Expanding Hubble-Hawking Universe

A Rotating Model of a Light Speed Expanding Hubble-Hawking Universe

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