Galaxy Spin Statistics and Spin-Density Correlation

Abstract

We present a theoretical study of galaxy spin correlation statistics, with detailed technical derivations. We also find an expression for the spin-density cross-correlation, and apply that to the Tully galaxy catalog. The observational results appear qualitatively consistent with the theoretical predictions, yet the error bars are still large. However, we expect that currently ongoing large surveys such as the Sloan Digital Sky survey (SDSS) will enable us to make a precision measurement of these correlation statistics in the near future. These intrinsic galaxy alignments are expected to dominate over the weak lensing signal in SDSS, and we present the detailed algorithms for the density reconstruction for this case. These observables are tracers of the galaxy-gravity interaction, which may provide us deeper insights into the galaxy formation and large scale matter distribution as well.

Accepted version, ApJ in press, remaining mistakes and typos correctedd, LaTex file, 41 pages, 3 eps figures

References in corpus (6)

• Detection of weak gravitational lensing distortions of distant galaxies by cosmic dark matter at large scales
• Intrinsic and Extrinsic Galaxy Alignment
• Weak lensing surveys and the intrinsic correlation of galaxy ellipticities
• Intrinsic Correlation of Galaxy Shapes: Implications for Weak Lensing Measurements
• Cosmic Shear from Galaxy Spins
• Tentative Detection of Galaxy Spin Correlations in the Tully Catalogue

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