Abstract
The Oort limit and galaxy photometry A study of the spatial distribution of stars perpendicular to the Galactic plane in 1932 of stars and their velocities resulted in an estimate of the local density. Oort¡¯s wish to study the dynamics of external galaxies resulted in a few months stay of the Oorts at Perkins Observatory in Delaware, Ohio.
Then how do you know it’s there?’ He slows to a stop
at a red light. ‘Dark matter has a gravitational effect on other,
objects. You can’t see it you can’t feel it, but you can watch
something being pulled in its direction.
Jodi Lynn Picoult, (b. 1966) [173]
In a sense, the galaxy hardest for us to see is our own.
For one thing, we are imprisoned within it, while the others can
be viewed as a whole from outside. Furthermore, we are far out,
from the center and to make matters worse, we lie in a spiral
arm clogged with dust.
Isaac Asimov [174]
Jodi Picoult is an American writer.
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Notes
- 1.
In modern times we use the property M / L, the ‘mass-to-light ratio’, for this. The value for the solar neighborhood is of order 5 (within a factor 1.5 or so), so Hubble’s 1/1.3 = 0.77 is too low.
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van der Kruit, P.C. (2019). The Oort Limit and Galaxy Photometry. In: Jan Hendrik Oort. Astrophysics and Space Science Library, vol 459. Springer, Cham. https://doi.org/10.1007/978-3-030-17801-7_7
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