Solo dwarfs IV: Comparing and contrasting satellite and isolated dwarf galaxies in the Local Group

Abstract

We compare and contrast the stellar structures of isolated Local Group dwarf galaxies, as traced by their oldest stellar populations, with the satellite dwarf galaxies of the Milky Way and M31. All Local Group dwarfs with Mv < -6 and surface brightness < 26.5 mags. per square arcsec. are considered, taking advantage of measurements from surveys that use similar observations and analysis techniques. For the isolated dwarfs, we use the results from Solitary Local (Solo) Dwarf Galaxy Survey. We begin by confirming that the structural and dynamical properties of the two satellite populations are not obviously statistically different from each other, but we note that there many more satellites around M31 than around the Milky Way down to equivalent magnitude and surface brightness limits. We find that dwarfs in close proximity to a massive galaxy generally show more scatter in their Kormendy relations than those in isolation. Specifically, isolated Local Group dwarf galaxies show a tighter trend of half-light radius versus magnitude than the satellite populations, and similar effects are also seen for related parameters. There appears to be a transition in the structural and dynamical properties of the dwarf galaxy population around ~400 kpc from the Milky Way and M31, such that the smallest, faintest, most circular dwarf galaxies are found closer than this separation. We discuss the impact of selection effects on our analysis, and we argue that our results point to the significance of tidal interactions on the population of systems within approximately 400 kpc from the MW and M31.

arXiv comment15 pages, 6 figures, 5 tables. Accepted to MNRAS

References in corpus (89)

• Gaia Data Release 2. Summary of the contents and survey properties
• The observed properties of dwarf galaxies in and around the Local Group
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: I. Morphology of the Sagittarius Core and Tidal Arms
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• The Origin of Star Formation Gradients in Rich Galaxy Clusters
• LCDM-based models for the Milky Way and M31 I: Dynamical Models
• A Universal Mass Profile for Dwarf Spheroidal Galaxies?
• The remnants of galaxy formation from a panoramic survey of the region around M31
• Updated Nearby Galaxy Catalog
• Simultaneous ram pressure and tidal stripping; how dwarf spheroidals lost their gas
• The Tidal Evolution of Local Group Dwarf Spheroidals
• High-resolution mass models of dwarf galaxies from LITTLE THINGS
• The Kinematics, Orbit, and Survival of the Sagittarius Dwarf Spheroidal Galaxy
• Velocity Dispersion Profiles of Seven Dwarf Spheroidal Galaxies
• Stellar Velocities in the Carina, Fornax, Sculptor and Sextans dSph Galaxies: Data from the Magellan/MMFS Survey
• The evolution of substructure III: the outskirts of clusters
• The Milky Way: An Exceptionally Quiet Galaxy; Implications for the formation of spiral galaxies
• The SAGA Survey: I. Satellite Galaxy Populations Around Eight Milky Way Analogs
• Mass and shape of the Milky Way's dark matter halo with globular clusters from Gaia and Hubble
• The Velocity Dispersion Profile of the Remote Dwarf Spheroidal Galaxy Leo I: A Tidal Hit and Run?
• The SAGA Survey. II. Building a Statistical Sample of Satellite Systems around Milky Way-like Galaxies
• A kinematic study of the Andromeda dwarf spheroidal system
• The large-scale structure of the halo of the Andromeda galaxy II. Hierarchical structure in the Pan-Andromeda Archaeological Survey
• Structural parameters for the M31 dwarf spheroidals
• A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part II); Distances to the Satellites of M31
• Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1
• The dynamics of isolated Local Group galaxies
• The SPLASH Survey: Spectroscopy of 15 M31 Dwarf Spheroidal Satellite Galaxies
• Tidal Interaction of M32 and NGC 205 with M31: Surface Photometry and Numerical Simulations
• The PAndAS view of the Andromeda satellite system - II. Detailed properties of 23 M31 dwarf spheroidal galaxies
• On the Efficiency of the Tidal Stirring Mechanism for the Origin of Dwarf Spheroidals: Dependence on the Orbital and Structural Parameters of the Progenitor Disky Dwarfs
• The Star Formation History and the spatial distribution of stellar populations in the Ursa Minor Dwarf Spheroidal Galaxy
• The Dearth of Neutral Hydrogen in Galactic Dwarf Spheroidal Galaxies
• Kinematics and chemistry of recently discovered Reticulum 2 and Horologium 1 dwarf galaxies
• The Gas Content and Stripping of Local Group Dwarf Galaxies
• NIHAO XV: The environmental impact of the host galaxy on galactic satellite and field dwarf galaxies
• The Planes of Satellite Galaxies Problem, Suggested Solutions, and Open Questions
• The Sensitivity of Harassment to Orbit: Mass Loss from Early-Type Dwarfs in Galaxy Clusters
• Identifying Local Group Field Galaxies which have interacted with the Milky Way
• The SPLASH Survey: Internal Kinematics, Chemical Abundances, and Masses of the Andromeda I, II, III, VII, X, and XIV dSphs
• A Search for "Dwarf" Seyfert Nuclei. VII. A Catalog of Central Stellar Velocity Dispersions of Nearby Galaxies
• A dynamical model of the local cosmic expansion
• Hubble Space Telescope Observations of M32: The Color-Magnitude Diagram
• The Resolved Structure and Dynamics of an Isolated Dwarf Galaxy: A VLT and Keck Spectroscopic Survey of WLM
• Tidal stripping and the structure of dwarf galaxies in the Local Group
• The Araucaria Project. The Distance to the Sculptor dwarf spheroidal galaxy from infrared photometry of RR Lyrae stars
• Local Group Dwarf Elliptical Galaxies: II. Stellar Kinematics to Large Radii in NGC 147 and NGC 185
• Life at the Periphery of the Local Group: the kinematics of the Tucana Dwarf Galaxy
• Tracing the Outer Structure of the Sagittarius Dwarf Galaxy: Detections at Angular Distances Between 10 and 34 Degrees
• Lacerta I and Cassiopeia III: Two luminous and distant Andromeda satellite dwarf galaxies found in the 3π Pan-STARRS1 survey
• The ACS LCID Project. I. Short-Period Variables in the Isolated Dwarf Spheroidal Galaxies Cetus & Tucana
• Stellar Kinematics of the Andromeda II Dwarf Spheroidal Galaxy
• The Red Giant Branch Tip and Bump of the Leo II dwarf spheroidal galaxy
• The cumulative mass profile of the Milky Way as determined by globular cluster kinematics from Gaia DR2
• The RR Lyrae Distance to the Draco Dwarf Spheroidal Galaxy
• Inside the whale: the structure and dynamics of the isolated Cetus dwarf spheroidal
• Chemistry and Kinematics of the Late-Forming Dwarf Irregular Galaxies Leo A, Aquarius, and Sagittarius DIG
• On the morphologies, gas fractions, and star formation rates of small galaxies
• The distance to the Sgr dwarf spheroidal galaxy from the Red Giant Branch Tip
• The distance to the Leo I dwarf spheroidal galaxy from the Red Giant Branch Tip
• Prolate rotation and metallicity gradient in the transforming dwarf galaxy Phoenix
• Constraining the distribution of dark matter in dwarf spheroidal galaxies with stellar tidal streams
• The stellar content of the Local Group dwarf galaxy Phoenix
• Clustering of Local Group distances: publication bias or correlated measurements? II. M31 and beyond
• The Araucaria Project. Infrared TRGB distances to the Carina and Fornax dwarf spheroidal galaxies
• The Outer Limits of the M31 System: Kinematics of the Dwarf Galaxy Satellites And XXVIII and And XXIX
• Orbits of massive satellite galaxies: II. Bayesian Estimates of the Milky Way and Andromeda masses using high precision astrometry and cosmological simulations
• An Observational Limit on the Dwarf Galaxy Population of the Local Group
• The stellar content of the isolated transition dwarf galaxy DDO210
• Spectroscopy of the three distant Andromedan satellites Cassiopeia III, Lacerta I, and Perseus I
• Andromeda XXIX: A New Dwarf Spheroidal Galaxy 200kpc from Andromeda
• Stellar Substructures around the Hercules Dwarf Spheroidal Galaxy
• RR Lyrae variables in M32 and the disk of M31
• Mapping the Tidal Disruption of the Hercules Dwarf: A Wide-Field DECam Imaging Search for RR Lyrae Stars
• A comparative study of satellite galaxies in Milky Way-like galaxies from HSC, DECaLS and SDSS
• The shapes of Milky Way satellites: looking for signatures of tidal stirring
• Solo dwarfs III: Exploring the orbital origins of isolated Local Group galaxies with Gaia Data Release 2
• Solo Dwarfs I: Survey introduction and first results for the Sagittarius Dwarf Irregular Galaxy
• The missing dwarf galaxies of the Local Group
• A wide-area view of the Phoenix dwarf galaxy from VLT/FORS imaging
• A MegaCam Survey of Outer Halo Satellites. I. Description of the Survey
• The stretching of Hercules
• A rogues gallery of Andromeda's dwarf galaxies I. A predominance of red horizontal branches
• On the radial extent of the dwarf irregular galaxy IC10
• Dwarfs in the Milky Way halo outer rim: first in-fall or backsplash satellites?
• A MegaCam Survey of Outer Halo Satellites. VII. A Single Sérsic Index v/s Effective Radius Relation for Milky Way Outer Halo Satellites
• Observing the stellar halo of Andromeda in cosmological simulations: the Auriga2PAndAS pipeline
• Globular Clusters in the Outer Halo of M31

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