Large-scale environments of narrow-line Seyfert 1 galaxies

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Table 2

SDSS Main Galaxy sample NLS1 statistics.

	N	Average density	N	N _gal ^a	R_vir^b (h^-1 Mpc)	R_max^c (h^-1 Mpc)	N	D_F (Mpc)^d

All	229	2.60 ± 0.13	51	10.96 ± 1.92	0.28 ± 0.02	0.50 ± 0.05	157	2.74 ± 0.20
RS	173	2.61 ± 0.15	41	10.44 ± 1.99	0.29 ± 0.02	0.53 ± 0.06	119	2.75 ± 0.23
RD	56	2.56 ± 0.27	10	12.91 ± 5.45	0.23 ± 0.05	0.41 ± 0.13	38	2.71 ± 0.40

Notes.

^(a)

Average richness of a group.

^(b)

Virial radius of the group, projected harmonic mean.

^(c)

Maximum radius of the group, projected harmonic mean.

^(d)

Distance to the closest filament axis.

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