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Detecting galaxy-filament alignments in the Sloan Digital Sky Survey III

Author(s): Chen, Yen-Chi; Ho, Shirley; Blazek, Jonathan; He, Siyu; Mandelbaum, Rachel; et al

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Abstract: Previous studies have shown the filamentary structures in the cosmic web influence the alignments of nearby galaxies. We study this effect in the LOWZ sample of the Sloan Digital Sky Survey using the ‘Cosmic Web Reconstruction’ filament catalogue. We find that LOWZ galaxies exhibit a small but statistically significant alignment in the direction parallel to the orientation of nearby filaments. This effect is detectable even in the absence of nearby galaxy clusters, which suggests it is an effect from the matter distribution in the filament. A non-parametric regression model suggests that the alignment effect with filaments extends over separations of 30-40 Mpc. We find that galaxies that are bright and early-forming align more strongly with the directions of nearby filaments than those that are faint and late-forming; however, trends with stellar mass are less statistically significant, within the narrow range of stellar mass of this sample.
Publication Date: May-2019
Electronic Publication Date: 26-Feb-2019
Citation: Chen, Yen-Chi, Ho, Shirley, Blazek, Jonathan, He, Siyu, Mandelbaum, Rachel, Melchior, Peter, Singh, Sukhdeep. (2019). Detecting galaxy-filament alignments in the Sloan Digital Sky Survey III. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 485 (2492 - 2504. doi:10.1093/mnras/stz539
DOI: doi:10.1093/mnras/stz539
ISSN: 0035-8711
EISSN: 1365-2966
Pages: 2492 - 2504
Type of Material: Journal Article
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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