Top Tweets for #lcgalacticdynamics
Newberg: lost of stucture within disk too: not just warps, but moving groups.
Conclusion: all of the stars in the MW are in disequilibrium substructures.
#LCGalacticDynamics
Newberg: Streams and other features in the disk from SDSS.
Assumption was looking for slight overdensities on top of smooth underlying halo distribution. Not right! The whole halo is structure.
#LCGalacticDynamics
Next up is Heidi Newberg about how disequilibrium in the Milky Way.
Eggen, Lynden-Bell, and Sandage (1962) envisioned monolithic collapse of primordial cloud. "In situ" stars formed as the way in. No longer a favored model.
#LCGalacticDynamics
EPRV: requires maintaining 10 cm/s precision for a decade. Signal grows linearly with T.
Eclipse timing: requires 0.1s precision over a decade. Signal grows quadratically with T.
Pulsar timing: Already has requisite precision, first detections!
#LCGalacticDynamics
@sukanya_X We can now make “real-time” measurements of accelerations in the Galaxy: changes in time of some velocity, measured over decades.
Corresponds to 10 cm/s/decade. Pulsar timing has achieved this already! EB timing will achieve this imminently.
#LCGalacticDynamics
@sukanya_X Lots of evidence now for disequilibrium in the Galactic disk—we should not interpret measurements with equilibrium models (Jeans analysis).
#LCGalacticDynamics
Getting started here at @lorentzcenter at #LCGalacticDynamics!
Today we start out with “101” talks on the 4 elements of the workshop: EPRVs, eclipse timing, pulsar timing, and theory/modeling of the dynamical disequilibrium of the Milky Way.
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