PAndAS in the mist: The stellar and gaseous mass within the halos of M31 and M33

Abstract

Large scale surveys of the prominent members of the Local Group have provided compelling evidence for the hierarchical formation of massive galaxies, revealing a wealth of substructure that is thought to be the debris from ancient and on-going accretion events. In this paper, we compare two extant surveys of the M31-M33 subgroup of galaxies; the Pan-Andromeda Archaeological Survey (PAndAS) of the stellar structure, and a combination of observations of the HI gaseous content, detected at 21cm. Our key finding is a marked lack of spatial correlation between these two components on all scales, with only a few potential overlaps between stars and gas.The paucity of spatial correlation significantly restricts the analysis of kinematic correlations, although there does appear to the HI kinematically associated with the Giant Stellar Stream where it passes the disk of M31. These results demonstrate that that different processes must significantly influence the dynamical evolution of the stellar and HI components of substructures, such as ram pressure driving gas away from a purely gravitational path. Detailed modelling of the offset between the stellar and gaseous substructure will provide a determination of the properties of the gaseous halo of M31 and M33.

11 pages, 6 figures. Accepted for publication in the Astrophysical Journal. Figure quality reduced. High quality version available at http://www.physics.usyd.edu.au/~gfl/Arxiv_Papers/PAndAS_Mist/

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• The survival of gas clouds in the Circumgalactic Medium of Milky Way-like galaxies
• A 2-3 billion year old major merger paradigm for the Andromeda galaxy and its outskirts
• Orbits of Massive Satellite Galaxies: I. A Close Look at the Large Magellanic Cloud and a New Orbital History for M33
• The vast thin plane of M31 co-rotating dwarfs: an additional fossil signature of the M31 merger and of its considerable impact in the whole Local Group
• The outer halo globular cluster system of M31 - I. The final PAndAS catalogue
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• The outer halo globular cluster system of M31 - II. Kinematics
• Gas Accretion via Condensation and Fountains
• The Nature and Origin of Substructure in the Outskirts of M31 -- II. Detailed Star Formation Histories
• The Hubble Space Telescope Survey of M31 Satellite Galaxies I. RR Lyrae-based Distances and Refined 3D Geometric Structure
• Discrete clouds of neutral gas between the galaxies M31 and M33
• Metallicity Evolution of the Six Most Luminous M31 Dwarf Satellites
• The outer halo globular cluster system of M31 - III. Relationship to the stellar halo
• Fermi-LAT Observations of Gamma-Ray Emission Towards the Outer Halo of M31
• A single-merger scenario for the formation of the giant stream and the warp of M31
• Integrated Light Chemical Tagging Analyses of Seven M31 Outer Halo Globular Clusters from the Pan-Andromeda Archaeological Survey
• A census of orbital properties of the M31 satellites
• KAT-7 Science Verification: Using HI Observations of NGC 3109 to Understand its Kinematics and Mass Distribution
• Metal-Rich PNe in the Outer Reaches of M31
• The global stability of M33: still a puzzle
• Substructure and Tidal Streams in the Andromeda Galaxy and its Satellites
• Euclid: Early Release Observations -- Deep anatomy of nearby galaxies
• Sensitive 21cm Observations of Neutral Hydrogen in the Local Group near M31
• Newly-Discovered Globular Clusters in NGC 147 and NGC 185 from PAndAS
• Formation of the Andromeda Giant Stream: Asymmetric Structure and Disc Progenitor
• Major Substructure in the M31 Outer Halo: the South-West Cloud
• Chemical Abundances of Planetary Nebulae in the Substructures of M31
• A deep Parkes HI survey of the Sculptor group and filament: HI mass function and environment
• The chemistry of planetary nebulae in the outer regions of M31
• A survey of HI gas toward the Andromeda Galaxy
• Tidally induced morphology of M33 in hydrodynamical simulations of its recent interaction with M31
• Collision tomography: Physical properties of possible progenitors of the Andromeda stellar stream
• The M31/M33 tidal interaction: A hydrodynamic simulation of the extended gas distribution
• Project AMIGA: Distance and Metallicity Gradients Along Andromeda's Giant Southern Stream from the Red Clump
• The elusive stellar halo of the Triangulum Galaxy
• Isolating the young stellar population in the outer disk of NGC 300
• Major Substructure in the M31 Outer Halo: the East Cloud
• Observing the stellar halo of Andromeda in cosmological simulations: the Auriga2PAndAS pipeline
• The nature of the progenitor of the M31 North-western stream: globular clusters as milestones of its orbit
• A Dwarf Disrupting -- Andromeda XXVII and the North West Stream
• Resolved Stellar Populations as Tracers of Outskirts
• A Detection of Gas Associated with the M 31 Stellar Stream
• A Differential RR Lyrae Line-of-Sight Distance Between M31 and M33
• The outskirts of M33: Tidally induced distortions versus signatures of gas accretion
• Neutral Gas Accretion onto Nearby Galaxies
• The nature of the Eastern Extent in the outer halo of M31