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

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Table 2

Sizes of different galaxy samples for the neighbourhood radius ν = 7.0h^-1 Mpc.

Selection	E	S0	Sab	Scd

all	84 877	71 800	135 585	76 893
N_rich = 1	42 724	37 053	72 970	45 429
2 ≤ N_rich ≤ 3	22 101	17 482	31 182	18 046
N_rich> 10	7532	7370	13 611	4877
4 ≤ N_rich ≤ 10, satellite	7627	7632	15 705	7622
4 ≤ N_rich ≤ 10, main	4893	2263	2117	919
D ≤ α_D	18 906	27 627	65 134	38 311
D > α _D	65 971	44 173	70 451	38 582
L ≤ α_L	48 385	35 770	93 746	41 115
L > α _L	36 492	36 030	41 839	35 778

Notes. 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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