peculiar velocity
(peculiar motion)
(velocity with respect to local rest)
Peculiar velocity is the motion of an object with respect
to local rest. "Rest" depends upon observation and purpose.
For a star within a galaxy, "rest" might be taken as the mean
motion of nearby stars, i.e., how this star's movement differs
from the general motion of those around it. For distant galaxies,
e.g., in cosmology studies, "rest" might be taken as the motion
respect to the Hubble flow, i.e., the expected motion
away from us due to Hubble's law.
(astrophysics,measure)
Further reading:
https://en.wikipedia.org/wiki/Peculiar_velocity
http://astronomy.swin.edu.au/cosmos/P/Peculiar+Velocity
https://dictionary.obspm.fr/index.php?showAll=1&formSearchTextfield=peculiar+velocity
Referenced by pages:
age-velocity-dispersion relation (AVR)
Alcock-Paczyński effect (AP effect)
baryon acoustic oscillations (BAO)
CMB anisotropies
cosmological redshift
galactic archaeology
galactic coordinate system (GCS)
Great Attractor
Hubble expansion
Local Group (LG)
Local Sheet
maser
moving-cluster method
plate
Population I (Pop I)
Population II (Pop II)
pulsar timing array (PTA)
radial velocity (RV)
red clump (RC)
redshift (z)
redshift space
solar apex
stellar association
stellar astronomy
Sunyaev-Zel'dovich effect (SZ effect)
thick disk
thin disk
velocity kick
velocity-metallicity relation
Index