Astrophysics (Index)About

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
Sunyaev-Zel'dovich effect (SZ effect)
thick disk
thin disk
velocity kick
velocity-metallicity relation

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