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A KINEMATICALLY DISTINCT RR-LYRAE OVERDENSITY IN THE INNER REGIONS OF THE MILKY WAY

Casetti-Dinescu, Dana I. ; Nusdeo, Daniel A. ; Girard, Terrence M. ; Korchagin, Vladimir I. ; Altena, William F. van

Astrophysical journal. Letters, 2015-09, Vol.810 (1), p.1-5 [Periódico revisado por pares]

United States: The American Astronomical Society

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Título:
A KINEMATICALLY DISTINCT RR-LYRAE OVERDENSITY IN THE INNER REGIONS OF THE MILKY WAY
Autor: Casetti-Dinescu, Dana I. ; Nusdeo, Daniel A. ; Girard, Terrence M. ; Korchagin, Vladimir I. ; Altena, William F. van
Assuntos: Angular momentum ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; DISTANCE ; Galactic halos ; Galaxies ; Galaxy: halo ; Galaxy: kinematics and dynamics ; Line of sight ; MANY-BODY PROBLEM ; METALLICITY ; MILKY WAY ; Milky Way Galaxy ; ORBITS ; Planes ; PROPER MOTION ; SATELLITES ; Siding ; SIMULATION ; stars: variables: RR Lyrae
É parte de: Astrophysical journal. Letters, 2015-09, Vol.810 (1), p.1-5
Notas: LET32965
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: ABSTRACT We combine the Siding Spring Survey of RR Lyrae stars with the Southern Proper Motion Catalog 4, in order to detect and kinematically characterize overdensities in the inner halo of the Milky Way. We identify one such overdensity above the Galactic plane, in quadrant 4 of the Galaxy. The overdensity extends at least in longitude, has an average heliocentric distance of 8 kpc with a depth of 4 kpc, and is confined within 4 kpc of the Galactic plane. Its metallicity distribution is distinct from that of the field population having a peak at −1.3 and a pronounced tail to −2.0. Proper motions indicate a net vertical motion away from the plane, and a low orbital angular momentum. Qualitatively, these orbit properties suggest a possible association with Centauri's parent satellite. However, comparison to a specific Cen N-body disruption model does not give a good match with observations. Line of sight velocities, and more extensive N-body modeling will help clarify the nature of this overdensity.
Editor: United States: The American Astronomical Society
Idioma: Inglês

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A KINEMATICALLY DISTINCT RR-LYRAE OVERDENSITY IN THE INNER REGIONS OF THE MILKY WAY

Casetti-Dinescu, Dana I. ; Nusdeo, Daniel A. ; Girard, Terrence M. ; Korchagin, Vladimir I. ; Altena, William F. van

United States: The American Astronomical Society

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