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Title: RINGS AND RADIAL WAVES IN THE DISK OF THE MILKY WAY

Abstract

Here, we show that in the anticenter region, between Galactic longitudes of 110° < l < 229°, there is an oscillating asymmetry in the main-sequence star counts on either side of the Galactic plane using data from the Sloan Digital Sky Survey. This asymmetry oscillates from more stars in the north at distances of about 2 kpc from the Sun to more stars in the south at 4–6 kpc from the Sun to more stars in the north at distances of 8–10 kpc from the Sun. We also see evidence that there are more stars in the south at distances of 12–16 kpc from the Sun. The three more distant asymmetries form roughly concentric rings around the Galactic center, opening in the direction of the Milky Way's spiral arms. The northern ring, 9 kpc from the Sun, is easily identified with the previously discovered Monoceros Ring. Parts of the southern ring at 14 kpc from the Sun (which we call the TriAnd Ring) have previously been identified as related to the Monoceros Ring, and others have been called the Triangulum Andromeda Overdensity. The two nearer oscillations are approximated by a toy model in which the disk plane is offset bymore » the order of 100 pc up and then down at different radii. We also show that the disk is not azimuthally symmetric around the Galactic anticenter and that there could be a correspondence between our observed oscillations and the spiral structure of the Galaxy. Lastly, our observations suggest that the TriAnd and Monoceros Rings (which extend to at least 25 kpc from the Galactic center) are primarily the result of disk oscillations.« less

Authors:
ORCiD logo [1];  [2];  [2];  [3];  [3];  [4];  [5]; ORCiD logo [6]
  1. Chinese Academy of Sciences, Beijing (China). Key Laboratory of Optical Astronomy, National Astronomical Observatories; Rensselaer Polytechnic Institute, Troy, NY (United States). Department of Physics, Applied Physics and Astronomy
  2. Rensselaer Polytechnic Institute, Troy, NY (United States). Department of Physics, Applied Physics and Astronomy
  3. Chinese Academy of Sciences, Beijing (China). Key Laboratory of Optical Astronomy, National Astronomical Observatories
  4. Chinese Academy of Sciences, Shanghai (China). Shanghai Astronomical Observatory
  5. Univ. of Oxford (United Kingdom). Rudolf-Peierls Centre for Theoretical Physics
  6. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Experimental Astrophysics Group
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1395474
Report Number(s):
arXiv:1503.00257; FERMILAB-PUB-17-388-CD
Journal ID: ISSN 1538-4357; 1624635
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 801; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Galaxy: disk; Galaxy: kinematics and dynamics; Galaxy: structure

Citation Formats

Xu, Yan, Newberg, Heidi Jo, Carlin, Jeffrey L., Liu, Chao, Deng, Licai, Li, Jing, Schönrich, Ralph, and Yanny, Brian. RINGS AND RADIAL WAVES IN THE DISK OF THE MILKY WAY. United States: N. p., 2015. Web. doi:10.1088/0004-637X/801/2/105.
Xu, Yan, Newberg, Heidi Jo, Carlin, Jeffrey L., Liu, Chao, Deng, Licai, Li, Jing, Schönrich, Ralph, & Yanny, Brian. RINGS AND RADIAL WAVES IN THE DISK OF THE MILKY WAY. United States. doi:10.1088/0004-637X/801/2/105.
Xu, Yan, Newberg, Heidi Jo, Carlin, Jeffrey L., Liu, Chao, Deng, Licai, Li, Jing, Schönrich, Ralph, and Yanny, Brian. Wed . "RINGS AND RADIAL WAVES IN THE DISK OF THE MILKY WAY". United States. doi:10.1088/0004-637X/801/2/105. https://www.osti.gov/servlets/purl/1395474.
@article{osti_1395474,
title = {RINGS AND RADIAL WAVES IN THE DISK OF THE MILKY WAY},
author = {Xu, Yan and Newberg, Heidi Jo and Carlin, Jeffrey L. and Liu, Chao and Deng, Licai and Li, Jing and Schönrich, Ralph and Yanny, Brian},
abstractNote = {Here, we show that in the anticenter region, between Galactic longitudes of 110° < l < 229°, there is an oscillating asymmetry in the main-sequence star counts on either side of the Galactic plane using data from the Sloan Digital Sky Survey. This asymmetry oscillates from more stars in the north at distances of about 2 kpc from the Sun to more stars in the south at 4–6 kpc from the Sun to more stars in the north at distances of 8–10 kpc from the Sun. We also see evidence that there are more stars in the south at distances of 12–16 kpc from the Sun. The three more distant asymmetries form roughly concentric rings around the Galactic center, opening in the direction of the Milky Way's spiral arms. The northern ring, 9 kpc from the Sun, is easily identified with the previously discovered Monoceros Ring. Parts of the southern ring at 14 kpc from the Sun (which we call the TriAnd Ring) have previously been identified as related to the Monoceros Ring, and others have been called the Triangulum Andromeda Overdensity. The two nearer oscillations are approximated by a toy model in which the disk plane is offset by the order of 100 pc up and then down at different radii. We also show that the disk is not azimuthally symmetric around the Galactic anticenter and that there could be a correspondence between our observed oscillations and the spiral structure of the Galaxy. Lastly, our observations suggest that the TriAnd and Monoceros Rings (which extend to at least 25 kpc from the Galactic center) are primarily the result of disk oscillations.},
doi = {10.1088/0004-637X/801/2/105},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 801,
place = {United States},
year = {Wed Mar 11 00:00:00 EDT 2015},
month = {Wed Mar 11 00:00:00 EDT 2015}
}

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