Alignment of galaxies relative to their local environment in SDSS-DR8

A. Hirv; J. Pelt; E. Saar; E. Tago; A. Tamm; E. Tempel; M. Einasto

doi:10.1051/0004-6361/201629248

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Volume 599 (March 2017)

A&A, 599 (2017) A31

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Table 4

Alignment of minor axes of E galaxies and spin axes of S0, Sab, and Scd galaxies relative to DALE for the neighbourhood radius ν = 7.0h^-1 Mpc.

Selection	E	S0	Sab	Scd

all	⊥	⊥	⊥	∥
N_rich = 1	⊥	⊥	⊥	◯
2 ≤ N_rich ≤ 3	⊥	⊥	◯	∥
N_rich> 10	◯	⊥	◯	◯
4 ≤ N_rich ≤ 10, satellite	⊥	◯	◯	◯
4 ≤ N_rich ≤ 10, main	⊥	⊥	◯	◯
D ≤ α_D	⊥	⊥	⊥	◯
D > α _D	⊥	⊥	◯	∥
L ≤ α_L	⊥	⊥	⊥	∥
L > α _L	⊥	⊥	◯	◯

Notes. ∥ – parallel, ⊥ – perpendicular, ◯ – no alignment. N_rich is number of galaxies in group. The critical values α_D for environmetal density D and α_L for r-band luminosity L are given in Sects. 4.2.1 and 4.2.2.

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