In: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 39, no. 1
P. Novotný - L. Neslušan
Detaily:
Rok, strany: 2009, 25 - 33
Kľúčové slová:
Comets: general, Oort cloud, Galaxy: solar neighbourhood
URL originálneho zdroja: http://www.astro.sk/caosp/Eedition/Abstracts/2009/Vol_39/No_1/pp25-33_abstract.html
O článku:
The Galactic tide is the dominant outer perturber of the orbits of comets in
the Oort cloud. Its strength primarily depends on the density of matter in
the local Galactic disc. This parameter has been determined with a
relatively large uncertainty. The known original orbits of the dynamically
new comets provide a possibility of determining the density of the Galactic
matter within a study of dynamical evolution of comets in the outer Oort
cloud. We describe a procedure how to determine the dynamical density in
this way. Using the known orbital characteristics of new comets and the
generally accepted assumption of the directionally uniform outer Oort cloud,
we determine its radial structure and evaluate the quality of our structure
description by comparing the predicted and observed distributions of the
angular elements of new comets in the zone of visibility. The whole
procedure is repeated for a range of discrete values of the local
Galactic-matter density. The best agreement between the predicted and
observed angular-element distributions is expected for the actual value of
the density, which can be found in this way. For the adopted model of the
outer Oort cloud, we find that there is a quite well recognizable relation
between the level of the agreement and the value of the
local-Galactic-matter density. A value between ≈ 0.21
to ≈ 0.23 M☉ pc-3
corresponds to the best agreement and, thus, can be regarded as the most
probable actual value of the density.
Ako citovať:
ISO 690:
Novotný, P., Neslušan, L. 2009. The density of the Galactic matter in the solar neighbourhood derived from the dynamical characteristics of observed new comets. In Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 39, no.1, pp. 25-33. 1335-1842.
APA:
Novotný, P., Neslušan, L. (2009). The density of the Galactic matter in the solar neighbourhood derived from the dynamical characteristics of observed new comets. Contributions of the Astronomical Observatory Skalnaté Pleso, 39(1), 25-33. 1335-1842.