This is a follow-up to the 3/18 post about the Andromeda group being unique. There are no blue shift objects in the universe outside of our Local Group.
This exercise checks the local group.
I found a reference for the local group. It had 35 objects with their right ascension, declination, relative velocity, estimated distance.
Of the 35, 16 had blue shift, 11 had red shift, 8 were missing that value.
There are several objects with a blue shift and they are relatively near Andromeda, both in position and distance.
This is just a coarse analysis of the local group motions.
Andromeda galaxy M31 has a relative velocity of -301
according to the reference, with no units in the chart.
( https://arxiv.org/ftp/astro-ph/papers/9908/9908050.pdf )
However other references for this velocity indicate M31 is at -110 km/sec; I do not know why there is a difference.
Rather than recalculating another's numbers I left them as published. From the paper, a change was possibly done to the values to compensate for solar velocity. I have no reference with original values.
This exercise is only relative velocities and relative positions.
This is a preliminary analysis based on what is available.
Vr = velocity as relative value; + is red shift or recession.
D2 = distance to object, in Mpc
Vr=M = missing data
DEG is dwarf Elliptical Galaxy
DIG is dwarf Irregular Galaxy
DS is dwarf spherical galaxy
This is the spread around the local group, relative to M31, starting at the opposite point in azimuth so M31 is roughly in the middle of the list. There are 35 objects in the reference; their order was by RA.
M31’s right ascension is 00h 42m; its declination is 41d 16m
AD values are from object to M31, to nearest hour or degree
D+ value indicates object has higher declination than M31.
name / position relative to M31 / vel. / distance
DDO 199 A-9h D+26d Vr=-247 D2=0.06
DDO 208 Ah Dd Vr=-293 D2= 0.08
sagittarius-DS A-6h D71d Vr=+142 D2= 0.03
SAG-DIG A-5h D-58d Vr=-79 D2= 1.40
NGC 6822 Ah D-55d Vr=-56 D2= 0.50
DDO 210 Ah Dd Vr=-131 D2= 1.02
Tucana-DS A-4h D-105d Vr=M D2=0.87
And VII A-1h D9d Vr= M D2=0.69
DDO 216 Ah Dd Vr=-182 D2= 0.76
And VI A-1h D-17d Vr=M D2= 0.83
DDO221 A0h D-56d Vr=-120 D2= 0.93
UGC 192 A0h D+18d Vr=-344 D2= 0.66
NGC 185 A0h D-7d Vr=-193 D2= 0.66
And III A0h D-5d Vr=M D2= 0.76
NGC 185 A0h D+7d Vr=-202 D2= 0.22
NGC 205 A0h D0d Vr=-244 D2= 0.76
M32 A0h D0d Vr=-205 D2= 0.76
M31 Andromeda A0h D0d Vr=-301 D2= 0.76
And I A0h D-3d Vr=M D2= 0.81
SMC a0h d-113d Vr=148 D2= 0.06
Sculptor A+1h D-74d Vr=+110 D2= 0.09
LGS 3 A+1h D-20d Vr=-286 D2= 0.81
IV1613 A+1h D-39d Vr=-232 D2= 0.72
And V A+1h D+6d Vr=M D2= 0.81
And II A+1h D-8d Vr=M D2= 0.70
M33 A+1h D-11d Vr=-181 D2= 0.79
PhoenixDS A+1h D-85d Vr=M D2= 0.4
Fornax DS A+2h D-75d Vr=+53 D2= 0.14
LMC A+5h D-110d Vr=+275 D2= 0.05
Carina A+6h D-91d Vr=+223 D2= 0.10
Leo A DDO 69 A+9h D-71d Vr=+24 D2= 0.69
Leo I DS A+10h D-29d Vr=+287 D2= 0.25
Sextans DS A+10h D-42d Vr=+226 D2= 0.09
Leo II DDO 93 A+11h D-19d Vr=+76 D2= 0.21
UrsaMi DDO 199 A+15h D+26d Vr=-247 D2= 0.06
Draco DDO 208 A+17h D+26d Vr=-293 D2= 0.08
sagittarius-DS A+18h D-71d Vr=+142 D2= 0.03
I find other references to these recent additions to the Local Group but they are not in the reference for the data above:
Canis Major Dwarf
I can revisit this analysis after finding a better data set; since this data set is incomplete I wonder if research is archived for public research.
Last updated (03/21/2019)
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