$S^5$: Probing the Milky Way and Magellanic Clouds potentials with the 6-D map of the Orphan-Chenab stream

Abstract

We present a 6-D map of the Orphan-Chenab (OC) stream by combining the data from Southern Stellar Stream Spectroscopic Survey ($S^5$) and {\it Gaia}. We reconstruct the proper motion, radial velocity, distance, on-sky track and stellar density along the stream with spline models. The stream has a total luminosity of $M_V=-8.2$ and metallicity of $[Fe/H]=-1.9$, similar to classical Milky Way (MW) satellites like Draco. The stream shows drastic changes in its physical width varying from 200 pc to 1 kpc, but a constant line of sight velocity dispersion of 5 km/ss. Despite the large apparent variation in the stellar number density along the stream, the flow rate of stars along the stream is remarkably constant. We model the 6-D stream track by a Lagrange-point stripping method with a flexible MW potential in the presence of a moving extended Large Magellanic Cloud (LMC). This allows us to constrain the mass profile of the MW within the distance range 15.6 < r < 55.5 kpc, with the best measured enclosed mass of $(2.85\pm 0.1)\times 10^{11}{M}_{\odot }$ within 32.4 kpc. Our stream measurements are highly sensitive to the LMC mass profile with the most precise measurement of its enclosed mass made at 32.8 kpc, $(7.02\pm 0.9)\times 10^{10}{\mathrm{M}}_{\odot }$. We also detect that the LMC dark matter halo extends to at least 53 kpc. The fitting of the OC stream allows us to constrain the past LMC trajectory and the degree of dynamical friction it experienced. We demonstrate that the stars in the OC stream show large energy and angular momentum spreads caused by LMC perturbation.

accepted to MNRAS; data released with the paper is available on Zenodo https://doi.org/10.5281/zenodo.7222654

References in corpus (45)

• Array Programming with NumPy
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• galpy: A Python Library for Galactic Dynamics
• The mass distribution and gravitational potential of the Milky Way
• A distance to the Large Magellanic Cloud that is precise to one per cent
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• Detection of a 63 Degree Cold Stellar Stream in the Sloan Digital Sky Survey
• The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters
• 4MOST: Project overview and information for the First Call for Proposals
• An Orphan in the "Field of Streams"
• "Skinny Milky Way, Please", says Sagittarius
• Globular Cluster Streams as Galactic High-Precision Scales - The Poster Child Palomar 5
• The shape of the inner Milky Way halo from observations of the Pal 5 and GD-1 stellar streams
• The SEGUE Stellar Parameter Pipeline. IV. Validation with an Extended Sample of Galactic Globular and Open Clusters
• The Space Motion of Leo I: Hubble Space Telescope Proper Motion and Implied Orbit
• Proper Motions, Orbits, and Tidal Influences of Milky Way Dwarf Spheroidal Galaxies
• All-Sky Dynamical Response of the Galactic Halo to the Large Magellanic Cloud
• Generation of mock tidal streams
• Detection of the Milky Way reflex motion due to the Large Magellanic Cloud infall
• galstreams: A Library of Milky Way Stellar Stream Footprints and Tracks
• Gaps in globular cluster streams: giant molecular clouds can cause them too
• Milky Way potentials in CDM and MOND. Is the Large Magellanic Cloud on a bound orbit?
• Kinematics of Antlia 2 and Crater 2 from The Southern Stellar Stream Spectroscopic Survey (S5)
• Discovery of a cold stellar stream in the ATLAS DR1 data
• Orbital Clustering Identifies the Origins of Galactic Stellar Streams
• Metallicity and $\alpha$-element Abundance Gradients along the Sagittarius Stream as Seen by APOGEE
• Is Ursa Major II the Progenitor of the Orphan Stream?
• Completeness of the Gaia-verse II: what are the odds that a star is missing from Gaia DR2?
• Serendipitous Discovery of a Thin Stellar Stream near the Galactic Bulge in the Pan-STARRS1 3Pi Survey
• The effect of the deforming dark matter haloes of the Milky Way and the Large Magellanic Cloud on the Orphan-Chenab stream
• Action-space clustering of tidal streams to infer the Galactic potential
• The Pisces Plume and the Magellanic Wake
• Observations of a Magellanic Corona
• Fitting orbits to tidal streams
• Proper Motion of the Leo II Dwarf Galaxy Based On Hubble Space Telescope Imaging
• A SkyMapper view of the Large Magellanic Cloud: The dynamics of stellar populations
• The Magellanic Edges Survey I. Description and First Results
• The impact of a massive Sagittarius dSph on GD-1-like streams
• Population gradient in Sextans dSph: Comprehensive mapping of a dwarf galaxy by Suprime-Cam
• Selecting Sagittarius: Identification and Chemical Characterization of the Sagittarius Stream
• Uniform Modelling of the Stellar Density of Thirteen Tidal Streams within the Galactic Halo
• Estimate of the Mass and Radial Profile of the Orphan-Chenab Stream's Dwarf Galaxy Progenitor Using MilkyWay@home

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