Alignment of galaxy spins in the vicinity of voids

Slosar, Anže; White, Martin

doi:10.1088/1475-7516/2009/06/009

Cited by 28 publications

(39 citation statements)

References 45 publications

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“…Each spin vector is normalized to unity. Other authors chose to use just one (Lee & Erdogdu 2007) or both (Kashikawa & Okamura 1992;Varela et al 2012) spin vector simultaneously (as we do) or use some other approach to deal with this indeterminacy of the spin vectors of galaxies (Trujillo et al 2006;Slosar & White 2009). …”

Section: Observational Samples and Galaxy Spin Vectorsmentioning

confidence: 99%

“…Navarro et al (2004) found that (spiral) galaxies in the supergalactic plane tend to spin with their spin axis in the supergalactic plane. Trujillo et al (2006) also found that spin axes of spiral galaxies are preferentially in the plane of the walls of cosmic voids, although this signal appears to be disputed by Slosar & White (2009) who found no alignment between spiral galaxies and void walls. If sitting in a cosmic filament, and Tempel & Libeskind (2013) used the SDSS to show that the short axes of elliptical galaxies tend to be perpendicular to the filament axis.…”

Section: Introductionmentioning

confidence: 99%

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The alignment of galaxy spin with the shear field in observations

Pahwa

Libeskind

Tempel

et al. 2016

Mon. Not. R. Astron. Soc.

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Tidal torque theory suggests that galaxies gain angular momentum in the linear stage of structure formation. Such a theory predicts alignments between the spin of haloes and tidal shear field. However, non-linear evolution and angular momentum acquisition may alter this prediction significantly. In this paper, we use a reconstruction of the cosmic shear field from observed peculiar velocities combined with spin axes extracted from galaxies within 115 Mpc (∼ 8000 kms −1 ) from 2MRS catalog, to test whether or not galaxies appear aligned with principal axes of shear field. Although linear reconstructions of the tidal field have looked at similar issues, this is the first such study to examine galaxy alignments with velocity-shear field. Ellipticals in the 2MRS sample, show a statistically significant alignment with two of the principal axes of the shear field. In general, elliptical galaxies have their short axis aligned with the axis of greatest compression and perpendicular to the axis of slowest compression. Spiral galaxies show no signal. Such an alignment is significantly strengthened when considering only those galaxies that are used in velocity field reconstruction. When examining such a subsample, a weak alignment with the axis of greatest compression emerges for spiral galaxies as well. This result indicates that although velocity field reconstructions still rely on fairly noisy and sparse data, the underlying alignment with shear field is strong enough to be visible even when small numbers of galaxies are considered -especially if those galaxies are used as constraints in the reconstruction.

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Section: Observational Samples and Galaxy Spin Vectorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The alignment of galaxy spin with the shear field in observations

Pahwa

Libeskind

Tempel

et al. 2016

Mon. Not. R. Astron. Soc.

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“…The detection of such an alignment of disc galaxies around voids has been claimed by Trujillo, Carretero & Patiri (2006) in the Two‐Degree Field Galaxy Redshift Survey (2dFGRS) and the SDSS. Their analysis was recently repeated by Slosar & White (2009) on the SDSS DR6 who however cannot reproduce the Trujillo et al (2006) result. The Slosar & White (2009) analysis extends out to a redshift of ≲ 0.18.…”

Section: Comparison With Observationsmentioning

confidence: 99%

“…Bailin et al (2008) find an alignment of late and intermediate type galaxies in SDSS with the surrounding large‐scale structure. For lower luminosity galaxies, in particular for L < L * , no alignment has been detected yet (see also Slosar & White 2009), although some results using N ‐body simulations indicate shape (Patiri et al 2006) or spin alignment (Brunino et al 2007; Cuesta et al 2008) around voids. Correlations of the spin of galaxies have been the subject of several analytical models (see e.g.…”

Section: Introductionmentioning

confidence: 99%

The large-scale orientations of disc galaxies

Hahn

Teyssier

Carollo

2010

Monthly Notices of the Royal Astronomical Society

133

160

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We use a 380‐h−1 pc resolution hydrodynamic adaptive mesh refinement (AMR) simulation of a cosmic filament to investigate the orientations of a sample of ∼100 well‐resolved galactic discs spanning two orders of magnitude in both stellar and halo mass. We find: (i) at z= 0, there is an almost perfect alignment at a median angle of 18°, in the inner dark matter halo regions where the discs reside, between the spin vector of the gaseous and stellar galactic discs and that of their inner host haloes. The alignment between galaxy spin and spin of the entire host halo is however significantly weaker, ranging from a median of ∼ 46° at z= 1 to ∼ 50° at z= 0. (ii) The most massive galaxy discs have spins preferentially aligned so as to point along their host filaments. (iii) The spin of discs in lower mass haloes shows, at redshifts above z∼ 0.5 and in regions of low environmental density, a clear signature of alignment with the intermediate principal axis of the large‐scale tidal field. This behaviour is consistent with predictions of linear tidal torque theory. This alignment decreases with increasing environmental density, and vanishes in the highest density regions. Non‐linear effects in the high‐density environments are plausibly responsible for establishing this density‐alignment correlation. We expect that our numerical results provide important insights for both understanding intrinsic alignment in weak lensing from the astrophysical perspective and formation and evolution processes of galactic discs in a cosmological context.

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“…There have been many observational studies 2 George James Conidis to look for alignment of baryonic spin with cosmic structure, but results have been contradictory. While some researchers have claimed to see alignment (Trujillo et al 2006;Lee & Erdogdu 2007;Paz et al 2008;Jones et al 2010), others have found that spin directions are random (Slosar & White 2009;Cervantes-Sodi et al 2010). In those studies which find evidence for alignment, there is a preference for a disk galaxy to have its spin vector directed along the midplane of its host sheet (Trujillo et al 2006;Varela et al 2012;Tempel & Libeskind 2013).…”

Section: Introduction and Overviewmentioning

confidence: 99%

Spin Alignment in Analogues of The Local Sheet

Conidis¹

2014

Proc. IAU

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Abstract.Tidal torque theory and simulations of large scale structure predict spin vectors of massive galaxies should be coplanar with sheets in the cosmic web. Recently demonstrated, the giants (Ks -22.5 mag) in the Local Volume beyond the Local Sheet have spin vectors directed close to the plane of the Local Supercluster, supporting the predictions of Tidal Torque Theory. However, the giants in the Local Sheet encircling the Local Group display a distinctly different arrangement, suggesting that the mass asymmetry of the Local Group or its progenitor torqued them from their primordial spin directions. To investigate the origin of the spin alignment of giants locally, analogues of the Local Sheet were identified in the SDSS DR9. Similar to the Local Sheet, analogues have an interacting pair of disk galaxies isolated from the remaining sheet members. Modified sheets in which there is no interacting pair of disk galaxies were identified as a control sample.Galaxies in face-on control sheets do not display axis ratios predominantly weighted toward low values, contrary to the expectation of tidal torque theory. For face-on and edge-on sheets, the distribution of axis ratios for galaxies in analogues is distinct from that in controls with a confidence of 97.6 % & 96.9%, respectively. This corroborates the hypothesis that an interacting pair can affect spin directions of neighbouring galaxies.

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Alignment of galaxy spins in the vicinity of voids

Cited by 28 publications

References 45 publications

The alignment of galaxy spin with the shear field in observations

The alignment of galaxy spin with the shear field in observations

The large-scale orientations of disc galaxies

Spin Alignment in Analogues of The Local Sheet

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