The Oort Limit
نویسندگان
چکیده
منابع مشابه
The Dynamical André-oort Conjecture: Unicritical Polynomials
We establish the equidistribution with respect to the bifurcation measure of postcritically finite maps in any one-dimensional algebraic family of unicritical polynomials. Using this equidistribution result, together with a combinatorial analysis of certain algebraic correspondences on the complement of the Mandelbrot set M2 (or generalized Mandelbrot set Md for degree d > 2), we classify all c...
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We calculate the expected flux profile of comets into the planetary system from the Oort Cloud arising from Galactic tides and encounters with molecular clouds. We find that both periodic and sporadic bombardment episodes, with amplitudes an order of magnitude above background, occur on characteristic time-scales ∼25–35 Myr. Bombardment episodes occurring preferentially during spiral arm crossi...
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The local stellar kinematics of the Milky Way offer a useful tool for studying the rotation curve of the Galaxy. These kinematics – usually parameterized by the Oort constants A and B – depend on the local gradient of the rotation curve as well as its absolute value (Θ0), and the Sun’s distance to the Galactic center (R0). The density of interstellar gas in the Milky Way is shown to vary non-mo...
متن کاملMOND orbits in the Oort cloud
We numerically investigate the features of typical orbits occurring in the Oort cloud (r ≈ 50 − 150 kAU) in the low-acceleration regime of the MOdified Newtonian Dynamics (MOND) taking into account the External Field Effect (EFE). We use three different forms of the MOND interpolating function μ(x) and two different values for the Galactic field at the Sun’s location. We find that MOND produces...
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We have calculated the number of dormant, nearly isotropic Oort cloud comets in the solar system by (i) combining orbital distribution models with statistical models of dormant comet discoveries by well-defined surveys and (ii) comparing the model results to observations of a population of dormant comets. Dynamical models that assume that comets are not destroyed predict that we should have dis...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1998
ISSN: 1539-2996
DOI: 10.1017/s1539299600021584