A purely acceleration-based measurement of the fundamental Galactic parameters. (arXiv:2012.02169v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Bovy_J/0/1/0/all/0/1">Jo Bovy</a>
Klioner et al. have used the Gaia EDR3 data to directly measure the solar
system’s acceleration within the Milky Way using the apparent proper motions of
quasars. Here I show that this single absolute acceleration measurement in
combination with relative accelerations obtained from pulsar orbital decay
allows one to determine all of the parameters describing the dynamics of our
local Galactic environment, including the circular velocity at the Sun $V_0 =
243 pm 8$ km/s and its derivative $V’_0 = 2 pm 9$ km/s/kpc, the local angular
frequency, the Oort constants, and the Sun’s motion with respect to the LSR.
This is the first determination of these parameters that only uses general
relativity without the need for additional assumptions.
Klioner et al. have used the Gaia EDR3 data to directly measure the solar
system’s acceleration within the Milky Way using the apparent proper motions of
quasars. Here I show that this single absolute acceleration measurement in
combination with relative accelerations obtained from pulsar orbital decay
allows one to determine all of the parameters describing the dynamics of our
local Galactic environment, including the circular velocity at the Sun $V_0 =
243 pm 8$ km/s and its derivative $V’_0 = 2 pm 9$ km/s/kpc, the local angular
frequency, the Oort constants, and the Sun’s motion with respect to the LSR.
This is the first determination of these parameters that only uses general
relativity without the need for additional assumptions.
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