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Correlation between the two-armed spiral in the -- plane and moving groups
Yan Xu, Chao Liu, Chengdong Li +5
We use a cross-matched sample of 3.7 million stars from Gaia DR3 and LAMOST DR7 to investigate the velocity substructures in the Milky Way disk. The median radial velocity as…
Estimate of Current Mass of the Large Magellanic Cloud from the Orphan-Chenab Tidal Stream
Hiroka T. Warren, Heidi Jo Newberg, Autumn G. Guffey +3
By fitting the tilt in the path of the Orphan-Chenab Stream (OCS), we conclude that the current mass of the Large Magellanic Cloud (LMC) within 30 kpc is -…
The Debris of the "Last Major Merger" is Dynamically Young
Thomas Donlon, Heidi Jo Newberg, Robyn Sanderson +4
The Milky Way's (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the "last major merger." Hypotheses for the origin of t…
Exploring asymmetric substructures of the outer disk based on the conjugate angle of the radial action
Y. Xu, C. Liu, Z. Li +5
We use the conjugate angle of radial action (), the best representation of the orbital phase, to explore the "mid-plane, north branch, south branch" and "Monoceros area" disk…
A Swing of the Pendulum: The Chemodynamics of the Local Stellar Halo Indicate Contributions from Several Radial Merger Events
Thomas Donlon, Heidi Jo Newberg
We find that the chemical abundances and dynamics of APOGEE and GALAH stars in the local stellar halo are inconsistent with a scenario in which the inner halo is primarily composed…
60 candidate high-velocity stars originating from the Sagittarius dwarf spheroidal galaxy in Gaia EDR3
Hefan Li, Cuihua Du, Jun Ma +3
Using proper motions from Gaia Early Data Release 3 (Gaia EDR 3) and radial velocities from several surveys, we identify 60 candidate high-velocity stars with total velocity greate…
Estimate of the Mass and Radial Profile of the Orphan-Chenab Stream's Dwarf Galaxy Progenitor Using MilkyWay@home
Eric J. Mendelsohn, Heidi Jo Newberg, Siddhartha Shelton +3
We fit the mass and radial profile of the Orphan-Chenab Stream's (OCS) dwarf galaxy progenitor by using turnoff stars in the Sloan Digital Sky Survey (SDSS) and the Dark Energy Cam…
The Local Stellar Halo is Not Dominated by a Single Radial Merger Event
Thomas Donlon, Heidi Jo Newberg, Bokyoung Kim +1
We use halo dwarf stars with photometrically determined metallicities that are located within 2 kpc of the Sun to identify local halo substructure. The kinematic properties of thes…
Element abundance analysis of the metal-rich stellar halo and high-velocitythick disk in the galaxy
Haifan Zhu, Cuihua Du, Yepeng Yan +3
Based on the second Gaia data release (DR2) and APOGEE (DR16) spectroscopic surveys, wedefined two kinds of star sample: high-velocity thick disk (HVTD) with and metal-…
Introduction to Tidal Streams
Heidi Jo Newberg
Dwarf galaxies that come too close to larger galaxies suffer tidal disruption; the differential gravitational force between one side of the galaxy and the other serves to rip the s…
Mapping Milky Way Halo Substructure using Stars in the Extended Blue Tail of the Horizontal Branch
Robert Gryncewicz, Heidi Jo Newberg, Charles Martin +2
Although Blue Horizontal Branch (BHB) stars are commonly used to trace halo substructure, the stars bluer than (g-r)<-0.3 are ignored due to the difficulty in determining their abs…
An Algorithm for Reconstructing the Orphan Stream Progenitor with MilkyWay@home Volunteer Computing
Siddhartha Shelton, Heidi Jo Newberg, Jake Weiss +16
We have developed a method for estimating the properties of the progenitor dwarf galaxy from the tidal stream of stars that were ripped from it as it fell into the Milky Way. In pa…
Two substructures in the nearby stellar halo found in Gaia and RAVE
Hefan Li, Cuihua Du, Yanbin Yang +4
We use the second Gaia data release (Gaia DR2), combined with RAVE spectroscopic surveys, to identify the substructures in the nearby stellar halo. We select 3,845 halo stars kinem…
Existence of the Metal-Rich Stellar Halo and High-velocity Thick Disk in the Galaxy
Yepeng Yan, Cuihua Du, Hefan Li +3
Based on the second Gaia data release (DR2), combined with the LAMOST and APOGEE spectroscopic surveys, we study the kinematics and metallicity distribution of the high-velocity st…
Exploring the pertubed Milky Way disk and the substructures of the outer disk
Y. Xu, C. Liu, H. Tian +6
The recent discovery of a spiral feature in phase plane in the solar neighborhood implies that the Galactic disk has been remarkably affected by a dwarf galaxy passing thro…
The Milky Way's Shell Structure Reveals the Time of a Radial Collision
Thomas Donlon, Heidi Jo Newberg, Robyn Sanderson +1
We identify shell structures in the Milky Way for the first time. We find 2 shells in the Virgo Overdensity (VOD) region and 2 shells in the Hercules Aquila Cloud (HAC) region usin…
Dynamically Produced Moving Groups in Interacting Simulations
Peter Craig, Sukanya Chakrabarti, Heidi Jo Newberg +1
We show that Smoothed Particle Hydrodynamics (SPH) simulations of dwarf galaxies interacting with a Milky Way-like disk produce moving groups in the simulated stellar disk. We anal…
New nearby hypervelocity stars and their spatial distribution from Gaia DR2
Cuihua Du, Hefan Li, Yepeng Yan +5
Base on about 4,500 large tangential velocity () with high-precision proper motions and parallaxes in Gaia DR2 5D information derived from p…
A Cold Stellar Stream in Pegasus
H. D. Perottoni, C. Martin, H. J. Newberg +3
We report the serendipitous discovery of a stellar stream in the constellation Pegasus in the south Galactic hemisphere. The stellar stream was detected using the SDSS Data Release…
An Orbit Fit to Likely Hermus Stream Stars
Charles Martin, Paul M. Amy, Heidi Jo Newberg +4
We selected blue horizontal branch (BHB) stars within the expected distance range and sky position of the Hermus Stream from Data Release 10 of the Sloan Digital Sky Survey. We ide…
The substructures in the local stellar halo from Gaia and LAMOST
Hefan Li, Cuihua Du, Shuai Liu +2
Based on the second Gaia data release (Gaia DR2) and spectroscopy from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data, we identified 20,089 halo stars…
The origin of high velocity stars from Gaia and LAMOST
Cuihua Du, Hefan Li, Heidi Jo Newberg +4
Based on the second Gaia data (Gaia DR2) and spectroscopy from the LAMOST Data Release 5, we defined the high-velocity (HiVel) stars sample as those stars with $v_{\mathrm{gc}} > 0…
Fitting the density substructure of the stellar halo with MilkyWay@home
Jake Weiss, Heidi Jo Newberg, Matthew Newby +1
We propose and test a method for applying statistical photometric parallax to main sequence turn off (MSTO) stars in the Sloan Digital Sky Survey (SDSS). Using simulated data, we s…
The high velocity stars in the Local Stellar Halo from Gaia and LAMOST
Cuihua Du, Hefan Li, Shuai Liu +2
Based on the first Gaia data release and spectroscopy from the LAMOST Data Release 4, we study the kinematics and chemistry of the local halo stars. The halo stars are identified k…