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New Views From Galactoseismology: Rethinking the Galactic Disk-Halo Connection

Published online by Cambridge University Press:  02 August 2018

Allyson A. Sheffield
Affiliation:
LaGuardia Community College, City University of New York, 31-10 Thomson Ave., Long Island City, NY 11101USA email: asheffield@lagcc.cuny.edu
Kathryn V. Johnston
Affiliation:
Columbia University, Mail Code 5246, New York, NY, 10027, USA
Adrian M. Price-Whelan
Affiliation:
Princeton University, Princeton, NJ 08544, USA
Anastasios Tzanidakis
Affiliation:
Columbia University, Mail Code 5246, New York, NY, 10027, USA
Chervin F. P. Laporte
Affiliation:
Columbia University, Mail Code 5246, New York, NY, 10027, USA
Ting Li
Affiliation:
Fermi National Accelerator Laboratory, P. O. Box 500, Batavia, IL 60510, USA
Maria Bergemann
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
Branimir Sesar
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
Jeffrey L. Carlin
Affiliation:
LSST, 933 North Cherry Avenue, Tucson, AZ 85721, USA
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Abstract

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We present preliminary results from a study exploring the origin of Milky Way substructures, and show initial evidence of a common “kicked-out” formation mechanism for two low-latitude substructures. In this scenario, stars in these substructures formed in the disk and were subsequently “kicked-out” by an external perturbation, such as the merger of an accreted satellite, which created an oscillation in the Galactic disk. To test this origin scenario, we found the fraction of different stellar populations – M giants and RR Lyrae stars – in the Monoceros Ring (also known as GASS) and A13, supplementing a study of stellar populations in the Triangulum-Andromeda cloud. This work provides: (1) the first analysis of the GASS and A13 features based upon their stellar populations; and (2) preliminary evidence of disk stars in the Milky Way that have been relocated to the disk-halo interface due to vertical oscillations of the Milky Way’s disk.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

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