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Galaxies are not distributed randomly in the cosmic web but are insteadarranged in filaments and sheets surrounding cosmic voids. Observationallythere is still no convincing evidence of a link between the properties ofgalaxies and their host structures. However, by the tidal torque theory (ourunderstanding of the origin of galaxy angular momentum), such a link shouldexist. Using the presently largest spectroscopic galaxy redshift survey (SDSS)we study the connection between the spin axes of galaxies and the orientationof their host filaments.  We use a three dimensional field of orientations to describe cosmicfilaments. To restore the inclination angles of galaxies, we use a 3Dphotometric model of galaxies that gives these angles more accurately thantraditional 2D models.  We found evidence that the spin axes of bright spiral galaxies have a weaktendency to be aligned parallel to filaments. For elliptical/S0 galaxies, wehave a statistically significant result that their spin axes are alignedpreferentially perpendicular to the host filaments; we show that this signalpractically does not depend on the accuracy of the estimated inclination anglesfor elliptical/S0 galaxies.

Evidence for spin alignment of spiral and elliptical/S0 galaxies in filaments