Rings and Radial Waves in the Disk of the Milky Way

  title={Rings and Radial Waves in the Disk of the Milky Way},
  author={Yan Xu and Heidi Jo Newberg and Jeffrey L. Carlin and Chao Liu and Licai Deng and Jing Li and Ralph Schonrich and Brian Yanny},
  journal={arXiv: Astrophysics of Galaxies},
We show that in the anticenter region, between Galactic longitudes of $110^\circ<l<229^\circ$, 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… Expand
The peculiar in-plane velocities in the outer disc of the Milky Way
We present the peculiar in-plane velocities derived from the LAMOST red clump stars, which are purified and separated by a novel approach into two groups with different ages. The samples are mostlyExpand
3D Asymmetrical motions of the Galactic outer disc with LAMOST K giant stars
We present a three dimensional velocity analysis of Milky Way disk kinematics using LAMOST K giant stars and the GPS1 proper motion catalogue. We find that Galactic disk stars near the anticenterExpand
The fall of the Northern Unicorn: tangential motions in the Galactic anticentre with SDSS and Gaia
We present the first detailed study of the behaviour of the stellar proper motion across the entire Galactic Anti-centre area visible in the Sloan Digital Sky Survey data. We use recalibrated SDSSExpand
Warps and waves in the stellar discs of the Auriga cosmological simulations
Recent studies have revealed an oscillating asymmetry in the vertical structure of the Milky Way's disc. Here we analyze 16 high-resolution, fully cosmological simulations of the evolution ofExpand
Torus Models of the Outer Disc of the Milky Way using LAMOST Survey Data
With a sample of 48,161 K giant stars selected from the LAMOST DR 2 catalogue, we construct torus models in a large volume extending, for the first time, from the solar vicinity to a GalactocentricExpand
Milky Way Tomography with K and M Dwarf Stars: the Vertical Structure of the Galactic Disk
We use the number density distributions of K and M dwarf stars with vertical height from the Galactic disk, determined using observations from the Sloan Digital Sky Survey, to probe the structure ofExpand
Blue extreme disk-runaway stars with Gaia EDR3
Since the discovery of hypervelocity stars in 2005, it has been widely believed that only the disruption of a binary system by a supermassive black hole at the Galactic center (GC), that is, theExpand
A Disk Origin for the Monoceros Ring and A13 Stellar Overdensities
The Monoceros Ring (also known as the Galactic Anticenter Stellar Structure) and A13 are stellar overdensities at estimated heliocentric distances of $d \sim 11$ kpc and 15 kpc observed at lowExpand
Asymmetric Mean Metallicity Distribution of the Milky Way’s Disk
  • D. An
  • Physics
  • The Astrophysical Journal
  • 2019
I present the mean metallicity distribution of stars in the Milky Way Galaxy based on photometry from the Sloan Digital Sky Survey. I utilize an empirically calibrated set of stellar isochronesExpand
A fully cosmological model of a Monoceros-like ring
We study the vertical structure of a stellar disk obtained from a fully cosmological high-resolution hydrodynamical simulation of the formation of a Milky Way-like galaxy. At the present day, theExpand


A Low-Latitude Halo Stream around the Milky Way
We present evidence for a ring of stars in the plane of the Milky Way, extending at least from l = 180° to 227° with turnoff magnitude g ~ 19.5; the ring could encircle the Galaxy. We infer that theExpand
We confirm that there are at least three separate low-latitude overdensities of blue F turnoff stars near the Milky Way anti-center: the Monoceros Ring, the Anti-Center Stream (ACS), and the EasternExpand
The Edge of the Galactic Disc
As part of a stellar population sampling program, a series of photometric probes at various field sizes and depths have been obtained in a low extinction window in the galactic anticentre direction.Expand
We find that Galactic disk stars near the anticenter exhibit velocity asymmetries in both the Galactocentric radial and vertical components across the midplane as well as azimuthally. These findingsExpand
One ring to encompass them all: a giant stellar structure that surrounds the Galaxy
Evidence is presented that the curious stellar population found by the Sloan Digital Sky Survey in the Galactic anticentre direction extends to other distant fields that skirt the plane of the Milky Way, suggesting that the outer rim of the Galaxy ends in a low surface brightness stellar ring. Expand
The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
We identify new structures in the halo of the Milky Way from positions, colors, and magnitudes of five million stars detected in the Sloan Digital Sky Survey. Most of these stars are within 126 ofExpand
A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion on to the Milky Way
An analysis of the asymmetries in the population of Galactic M-giant stars present in the 2MASS All Sky catalogue suggests that the Canis Major dwarf galaxy is a building block of the Galactic thick disk, that the thick disk is continually growing, even up to the present time, and that thick disk globular clusters were accreted onto the Milky Way from dwarf galaxies in co-planar orbits. Expand
The Stellar Number Density Distribution in the Local Solar Neighborhood is North-South Asymmetric
We study the number density distribution of a sample of K and M dwarf stars, matched north and south of the Galactic plane within a distance of 2 kpc from the Sun, using observations from the NinthExpand
Stellar Population Studies with the SDSS. I. The Vertical Distribution of Stars in the Milky Way
We present star count data from the Sloan Digital Sky Survey for 5.8 × 105 stars brighter than g' = 21 mag over 279 deg2 in two samples north and south of the Galactic plane. Using theseExpand
Galactic halo stellar structures in the Triangulum-Andromeda region
This Letter reports on the Galactic stellar structures that appear in the foreground of our Canada-France-Hawaii-Telecopse/MegaCam survey of the halo of the Andromeda galaxy. We recover the mainExpand