Please note that eDoc will be permanently shut down in the first quarter of 2021!      Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Quick Search
My eDoc
Session History
Support Wiki
Direct access to
document ID:

          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742585.0, MPI für Astronomie / Publikationen_mpia
Exploring halo substructure with giant stars. XV. Discovery of a connection between the Monoceros Ring and the Triangulum–Andromeda overdensity?
Authors:Li, T. S.; Sheffield, A. A.; Johnston, K. V.; Marshall, J. L.; Majewski, S. R.; Price-Whelan, A. M.; Damke, G. J.; Beaton, R. L.; Bernard, E. J.; Richardson, W.; Sharma, S.; Sesar, B.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal
Issue / Number:1
Start Page:id. 74 (11 pp)
Audience:Not Specified
Abstract / Description:Thanks to modern sky surveys, over 20 stellar streams and overdensity structures have been discovered in the halo of the Milky Way. In this paper, we present an analysis of spectroscopic observations of individual stars from one such structure, “A13,” first identified as an overdensity using the M giant catalog from the Two Micron All Sky Survey. Our spectroscopic observations show that stars identified with A13 have a velocity dispersion of ≲40 {km} {{{s}}}-1, implying that it is a genuine coherent structure rather than a chance superposition of random halo stars. From its position on the sky, distance (∼15 kpc heliocentric), and kinematical properties, A13 is likely to be an extension of another substructure at low Galactic latitude—the Galactic Anticenter Stellar Structure (also known as the Monoceros Ring)—toward smaller Galactic longitude and greater distance. Furthermore, the kinematics of A13 also connect it with another structure in the southern Galactic hemisphere—the Triangulum–Andromeda overdensity. We discuss these three connected structures within the context of a previously proposed scenario in which one or all of these features originate from the disk of the Milky Way.
Free Keywords:galaxies: interactions; Galaxy: disk; Galaxy: formation; Galaxy: halo; Galaxy: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.