1. What’s New with Peculiar Velocities?
hundreds of 5% distances within 6 Mpc
galaxies gather in groups; few are isolated
modest group masses; don’t account for much of
mean matter density
small dispersion in velocities on ~5 Mpc scales
dynamically evolved clusters with large M/L
significant streaming - local velocity anomaly
suggests the existence of considerable mass
associated with filaments but outside of groups

2. hundreds of 5% distances within 6 Mpc
good at 3 Mpc
hundreds of 5% distances within 6 Mpc
marginal at 5 Mpc
OK at 8 Mpc

3. good distances 2
a group of dwarf galaxies at 3 Mpc

4. good distances 3
a group at almost 8 Mpc with a large peculiar velocity
VLG = 180 km/s
Vpec= -380 km/s

5. good distances 4 all-sky inventory off POSS for dwarfs by
Karachentseva and Karachentsev ; HI follow-up
provides velocities
about 200 of ~400 suspected to lie within ~7 Mpc
now have good distances
if you are ever on the HST TAC,
give us time to do more!

6. galaxies gather in groups; few are isolated

7. galaxies gather in groups
2-point correlation
signal dominated by groups like Local Group
only dwarf groups

8. the local group
quasi-virialized
infall MW
M31 31

9. galaxies at 1.1 - 3.2 Mpc |b|>30o [66 Mpc3]
beyond Local Group
14+7 N U N U N U UA
14+8 U U U U
dregs U U
KKH KK
KKR
Mpc kpc
14+12 N
Sex B
Sex A
Antlia
KKH60 ? ?
2x1011 M in 0.4 Mpc3
14+13 N N E E E IC
9x1011 M in 0.3 Mpc3


10. modest group masses Omegam ~0.27
The mass in nearby groups of spirals is well below the level needed to explain the cosmic mean density

11. small dispersion in velocities on ~5 Mpc scales

12. dynamically evolved environments with large Vpec
V=1779 km/s
V= 558 km/s

13. significant streaming - the local velocity anomaly
Milky Way
plane of local filament
-460 km/s
-380 km/s
14+19 group
VLG=182 km/s

14. Numerical Action Models
Best models:
only ~1/3 of
mass distributed
like galaxies
considerable
mass smoothly
distributed on
5-10 Mpc scale

15. low velocity dispersion locally [~30 km/s]
modest M/L in groups of spiral galaxies [< 100]
large streaming motions between filaments
[several x 100 km/s]
global M/L assignments in NAM models in
reasonable agreement with concordance model
[~200]
conclusion:
Suggests the existence of considerable mass associated with filaments but outside of groups