J/ApJ/850/207 Action dynamics of the Local Supercluster (Shaya+, 2017)
Action dynamics of the Local Supercluster.
Shaya E.J., Tully R.B., Hoffman Y., Pomarede D.
<Astrophys. J., 850, 207 (2017)>
=2017ApJ...850..207S 2017ApJ...850..207S
ADC_Keywords: Models; Clusters, galaxy; Galaxies; Radial velocities
Keywords: cosmological parameters ; galaxies: distances and redshifts ;
galaxies: kinematics and dynamics ;
large-scale structure of universe ; Local Group
Abstract:
The fully nonlinear gravitationally induced trajectories of a nearly
complete set of galaxies, groups, and clusters in the Local
Supercluster are constructed in a numerical action method model
constrained by data from the CosmicFlows survey and various distance
indicators. We add the gravity field due to inhomogeneities external
to the sample sphere by making use of larger-scale peculiar flow
measurements. Assignments of total masses were made to find the best
overall set of mutual attractions, as determined by a goodness
criterion based on present-day radial velocities, individually for the
Virgo Cluster, M31, and the Milky Way (MW), and via a mass-to-light
ratio relationship for other masses. The low median chi-square found
indicates that the model fits the present-day velocity flow well, but
a slightly high mean chi-square may indicate that some masses
underwent complex orbits. The best fit, when setting the value of H0
to the CosmicFlows value of 75km/s/Mpc and the WMAP value for
Ωm=0.244 consistent with that H0, occurs with the following
parameters: Ωorphan=0.077±0.016,
M/LK=40±2L100.15M☉/L☉ (L10 is the K-band
luminosity in units of 1010L☉), a Virgo mass of
6.3±0.8x1014M☉ (M/LK=113±15M☉/L☉), and a
mass for the MW plus M31 of 5.15±0.35x1012M☉. The best
constant mass-to-light ratio is M/LK=58±3M☉/L☉. The
Virgocentric turnaround radius is 7.3±0.3Mpc. We explain several
interesting trends in peculiar motions for various regions now that we
can construct the 3D orbital histories.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 82 1382 Results of the velocities and masses in the best
model (updated version by the author)
--------------------------------------------------------------------------------
See also:
J/AJ/126/2152 : Cluster And Infall Region Nearby Survey. I (Rines+, 2003)
J/ApJ/676/184 : Peculiar motion away from the Local Void (Tully+, 2008)
J/AJ/138/332 : LEDA CMD/tip of the red giant branch (Jacobs+, 2009)
J/ApJS/199/26 : The 2MASS Redshift Survey (2MRS) (Huchra+, 2012)
J/AJ/146/86 : Cosmicflows-2 catalog (Tully+, 2013)
J/AJ/149/171 : 2MASS galaxy group catalog (Tully, 2015)
J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)
J/AJ/151/52 : The HIZOA-S survey (Staveley-Smith+, 2016)
J/AJ/152/50 : Cosmicflows-3 catalog (CF3) (Tully+, 2016)
J/ApJ/843/16 : Galaxy groups within 3500km/s (Kourkchi+, 2017)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- GName Identifier of most prominent system member
14- 19 I6 --- Nest [100002/900040] Numeric identifier (1)
21- 27 F7.2 10+11Msun Mass [0/6253] Mass
29- 32 I4 km/s vO [-106/3425] Observed radial velocity
34- 37 I4 km/s vM [-107/3207] Model radial velocity
39- 42 F4.1 Mpc Dist [0/43] Distance
44- 47 F4.2 --- e_Dist [0/0.3] Fractional uncertainty in Dist
49- 55 I7 --- PGC ? PGC number of the prominent system
57- 68 F12.8 deg RAdeg ? Right ascension (J2000)
70- 82 F13.9 deg DEdeg ? Declination (J2000)
--------------------------------------------------------------------------------
Note (1): The IDs that start with the digits 1 and 2 refer to nests (groups)
of galaxies from Tully (2015AJ....149...54T 2015AJ....149...54T ;
<[T2015] nest {Nest}> in Simbad -- if number of members >1), while
entities that are additional to that reference have an ID beginning
with 3. IDs that start with the digit 9 are not real objects (points
added to fill in the zone of avoidance).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
08-Oct-2018: PGC numbers and ra and dec as applied in the model have been
added by the author.
Acknowledgements:
Ed Shaya [University of Maryland]
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Jul-2018