Exploring Halo Substructure with Giant Stars. XV. Discovery of a Connection between the Monoceros Ring and the Triangulum–Andromeda Overdensity?

Li, Ting S.; Sheffield, Allyson A.; Johnston, Kathryn V.; Marshall, Jennifer L.; Majewski, Steven R.; Price-Whelan, Adrian M.; Damke, Guillermo J.; Beaton, Rachael L.; Bernard, Edouard J.; Richardson, Whitney; Sharma, Sanjib; Sesar, Branimir

doi:10.3847/1538-4357/aa7a0d

Title: Exploring Halo Substructure with Giant Stars. XV. Discovery of a Connection between the Monoceros Ring and the Triangulum–Andromeda Overdensity?

Journal Article · Mon Jul 24 00:00:00 EDT 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aa7a0d· OSTI ID:1395476

Li, Ting S. ^[1]; Sheffield, Allyson A. ^[2]; Johnston, Kathryn V. ^[3];

^[4];

^[5];

^[6]; Damke, Guillermo J. ^[7];

^[8];

^[9]; Richardson, Whitney ^[5];

^[10];

^[11]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Texas A & M Univ., College Station, TX (United States). Department of Physics & Astronomy; George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, College Station, TX (United States)
City University of New York, LaGuardia Community College, Long Island City, NY (United States). Department of Natural Sciences
Columbia Univ., New York, NY (United States). Department of Astronomy
Texas A & M Univ., College Station, TX (United States). Department of Physics & Astronomy; George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, College Station, TX (United States)
Univ. of Virginia, Charlottesville, VA (United States). Department of Astronomy
Princeton Univ., NJ (United States). Department of Astrophysical Sciences
Univ. of Virginia, Charlottesville, VA (United States). Department of Astronomy; Universidad de La Serena (Chile). Departamento de Fisica y Astronomia, Facultad de Ciencias
The Carnegie Observatories, Pasadena, CA (United States)
Universite Cote d Azur, OCA, CNRS, Lagrange (France)
Univ. of Sydney, NSW (Australia). Sydney Institute for Astronomy, School of Physics
Max Planck Institute for Astronomy, Heidelberg (Germany)

Thanks to modern sky surveys, over twenty stellar streams and overdensity structures have been discovered in the halo of the Milky Way. Here, 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 $$\lesssim$$ 40 $$\mathrm{km~s^{-1}}$$, implying that it is a genuine coherent structure rather than a chance super-position of random halo stars. From its position on the sky, distance ($$\sim$$15 kpc heliocentric), and kinematical properties, A13 is likely to be an extension of another low Galactic latitude substructure -- the Galactic Anticenter Stellar Structure (also known as the Monoceros Ring) -- towards smaller Galactic longitude and farther distance. Furthermore, the kinematics of A13 also connect it with another structure in the southern Galactic hemisphere -- the Triangulum-Andromeda overdensity. Finally, we discuss these three connected structures within the context of a previously proposed scenario that one or all of these features originate from the disk of the Milky Way.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1395476

Report Number(s):: arXiv:1703.05384; FERMILAB-PUB-17-389-AE; 1624631

Journal Information:: The Astrophysical Journal (Online), Vol. 844, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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