Resolved Stellar Populations as Tracers of Outskirts

Abstract

Galaxy haloes contain fundamental clues about the galaxy formation and evolution process: hierarchical cosmological models predict haloes to be ubiquitous, and to be (at least in part) the product of past merger and/or accretion events. The advent of wide-field surveys in the last two decades has revolutionized our view of our own Galaxy and its closest "sister", Andromeda, revealing copious tidal streams from past and ongoing accretion episodes, as well as doubling the number of their known faint satellites. The focus shall now be shifted to galaxy haloes beyond the Local Group: resolving individual stars over significant areas of galaxy haloes will enable estimates of their ages, metallicities and gradients. The valuable information collected for galaxies with a range of masses, morphologies and within diverse environments will ultimately test and quantitatively inform theoretical models of galaxy formation, and shed light onto the many challenges faced by simulations on galactic scales.

Invited review, Book chapter in "Outskirts of Galaxies", Eds. J. H. Knapen, J. C. Lee and A. Gil de Paz, Astrophysics and Space Science Library, Springer, in press

References in corpus (56)

• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• Two Stellar Components in the Halo of the Milky Way
• Reconciling dwarf galaxies with LCDM cosmology: Simulating a realistic population of satellites around a Milky Way-mass galaxy
• Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds
• A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
• The Local Dark Matter Density
• The accretion origin of the Milky Way's stellar halo
• The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action
• Tracing Galaxy Formation with Stellar Halos II: Relating Substructure in Phase- and Abundance-Space to Accretion Histories
• Too Big to Fail in the Local Group
• Detection of a 60 Degree-Long Dwarf Galaxy Debris Stream
• The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater
• The Hubble flow around the CenA / M83 galaxy complex
• Chemical tagging with APOGEE: Discovery of a large population of N-rich stars in the inner Galaxy
• The Metal-Poor Halo of the Andromeda Spiral Galaxy (M31)
• Small Dwarf Galaxies Within Larger Dwarfs: Why Some Are Luminous While Most Go Dark
• Co-orbiting satellite galaxy structures are still in conflict with the distribution of primordial dwarf galaxies
• Halo Mass and Assembly History Exposed in the Faint Outskirts: the Stellar and Dark Matter Haloes of Illustris Galaxies
• Hydra II: a faint and compact Milky Way dwarf galaxy found in the Survey of the Magellanic Stellar History
• A kinematically selected, metal-poor stellar halo in the outskirts of M31
• Discovery of New Dwarf Galaxies in the M81 Group
• The Recent Star Formation Histories of M81 Group Dwarf Irregular Galaxies
• A Synoptic Map of Halo Substructures from the Pan-STARRS1 3π Survey
• The outer halo globular cluster system of M31 - I. The final PAndAS catalogue
• A Hero's Dark Horse: Discovery of an Ultra-Faint Milky Way Satellite in Pegasus
• Global Properties of M31's Stellar Halo from the SPLASH Survey. I. Surface Brightness Profile
• First results from the MADCASH Survey: A Faint Dwarf Galaxy Companion to the Low Mass Spiral Galaxy NGC 2403 at 3.2 Mpc
• The outer halo globular cluster system of M31 - II. Kinematics
• Identifying true satellites of the Magellanic Clouds
• The Nature and Origin of Substructure in the Outskirts of M31. I. Surveying the Stellar Content with HST/ACS
• Global Properties of M31's Stellar Halo from the SPLASH Survey: II. Metallicity Profile
• The Nature and Origin of Substructure in the Outskirts of M31 -- II. Detailed Star Formation Histories
• Stellar populations across the NGC4244 truncated galactic disk
• Discovery of a new faint dwarf galaxy associated with NGC 253
• Star-formation in the HI bridge between M81 and M82
• Infrared Tip of the Red Giant Branch and Distances to the Maffei/IC 342 Group
• An HST/ACS investigation of the spatial and chemical structure and sub-structure of NGC 891, a Milky Way analogue
• A PAndAS view of M31 dwarf elliptical satellites: NGC147 and NGC185
• Tracing the outer halo in a giant elliptical to 25 Reff
• Sailing under the Magellanic Clouds: A DECam View of the Carina Dwarf
• Holmberg Ix: The Nearest Young Galaxy
• Does SEGUE/SDSS indicate a dual Galactic halo?
• Detection of a distinct metal-poor stellar halo in the early-type galaxy NGC 3115
• Substructure and Tidal Streams in the Andromeda Galaxy and its Satellites
• On the Stability of Satellite Planes I: Effects of Mass, Velocity, Halo Shape and Alignment
• The Dynamics and Metallicity Distribution of the Distant Dwarf Galaxy VV124
• Solo Dwarfs I: Survey introduction and first results for the Sagittarius Dwarf Irregular Galaxy
• Unearthing Foundations of a Cosmic Cathedral: Searching the Stars for M33's Halo
• An Arc of Young Stars in the Halo of M82
• Ultra-deep Imaging: Structure of Disks and Haloes
• The elusive stellar halo of the Triangulum Galaxy
• Spectroscopic confirmation of the dwarf spheroidal galaxy d0944+71 as a member of the M81 group of galaxies
• Low-metallicity stellar halo populations as tracers of dark matter haloes
• Outer Regions of the Milky Way

Cited by in corpus (6)

• The Auriga Stellar Haloes: Connecting stellar population properties with accretion and merging history
• The edges of galaxies: Tracing the limits of star formation
• A galaxy's accretion history unveiled from its integrated spectrum
• The impact of environment on size: Galaxies are 50% smaller in the Fornax Cluster compared to the field
• Ultra-deep Imaging: Structure of Disks and Haloes
• An Orbit Fit to Likely Hermus Stream Stars