The intrinsic ellipticity of dwarf spheroidal galaxies: constraints from the Andromeda system

Abstract

We present a study of the intrinsic deprojected ellipticity distribution of the satellite dwarf galaxies of the Andromeda galaxy, assuming that their visible components have a prolate shape, which is a natural outcome of simulations. Different possibilities for the orientation of the major axis of the prolate dwarf galaxies are tested, pointing either as close as possible to the radial direction towards the centre of Andromeda, or tangential to the radial direction, or with a random angle in the plane that contains the major axis and the observer. We find that the mean intrinsic axis ratio is ~ 1/2, with small differences depending on the assumed orientation of the population. Our deprojections also suggest that a significant fraction of the satellites, ~ 10%, are tidally disrupted remnants. We find that there is no evidence of any obvious difference in the morphology and major axis orientation between satellites that belong to the vast thin plane of co-rotating galaxies around Andromeda and those that do not belong to this structure.

arXiv comment12 pages, 17 figures, accepted for publication in MNRAS

References in corpus (45)

• A Universal Density Profile from Hierarchical Clustering
• The observed properties of dwarf galaxies in and around the Local Group
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• The New Galaxy: Signatures of its Formation
• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• A Universal Mass Profile for Dwarf Spheroidal Galaxies?
• The remnants of galaxy formation from a panoramic survey of the region around M31
• The tumultuous lives of galactic dwarfs and the missing satellites problem
• A comprehensive Maximum Likelihood analysis of the structural properties of faint Milky Way satellites
• A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
• A Faint New Milky Way Satellite in Bootes
• A New Milky Way Dwarf Satellite in Canes Venatici
• The great disk of Milky-Way satellites and cosmological sub-structures
• The Masses of the Milky Way and Andromeda galaxies
• The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the Milky Way
• The large-scale structure of the halo of the Andromeda Galaxy Part I: global stellar density, morphology and metallicity properties
• Local-Group tests of dark-matter Concordance Cosmology: Towards a new paradigm for structure formation
• A Pair of Bootes: A New Milky Way Satellite
• A kinematic study of the Andromeda dwarf spheroidal system
• A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part II); Distances to the Satellites of M31
• Co-orbiting satellite galaxy structures are still in conflict with the distribution of primordial dwarf galaxies
• A trio of new Local Group galaxies with extreme properties
• PAndAS' cubs: discovery of two new dwarf galaxies in the surroundings of the Andromeda and Triangulum galaxies
• Inferring the Andromeda Galaxy's mass from its giant southern stream with Bayesian simulation sampling
• 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
• M31 Satellite Masses Compared to LCDM Subhaloes
• A thousand shadows of Andromeda: rotating planes of satellites in the Millennium-II cosmological simulation
• Making Counter-Orbiting Tidal Debris: The Origin of the Milky Way Disc of Satellites
• The Formation of the Local Group Planes of Galaxies
• Reproducing properties of MW dSphs as descendants of DM-free TDGs
• The masses of Local Group dwarf spheroidal galaxies: The death of the universal mass profile
• Satellite decay in flattened dark matter haloes
• Comparing the observable properties of dwarf galaxies on and off the Andromeda plane
• Perseus I and the NGC 3109 association in the context of the Local Group dwarf galaxy structures
• The shape of dark matter subhalos in the Aquarius simulations
• The stellar structure and kinematics of dwarf spheroidal galaxies formed by tidal stirring
• A PAndAS view of M31 dwarf elliptical satellites: NGC147 and NGC185
• Perseus I: A distant satellite dwarf galaxy of Andromeda
• A comparison of the distribution of satellite galaxies around Andromeda and the results of $\Lambda$CDM simulations
• The VMC Survey - X. Cepheids, RR Lyrae stars and binaries as probes of the Magellanic System's structure
• Dissipative Dark Matter and the Andromeda Plane of Satellites
• Galactic Tides and the Shape and Orientation of Dwarf Galaxy Satellites
• Thin disk of co-rotating dwarfs: a fingerprint of dissipative (mirror) dark matter?
• Are the Ultra-Faint Dwarf Galaxies Just Cusps?
• Probing the distance and morphology of the Large Magellanic Cloud with RR Lyrae stars

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• The Pandora project. I: the impact of radiation and cosmic rays on baryonic and dark matter properties of dwarf galaxies
• A Formation Scenario for the Disk of Satellites: Accretion of Satellites during Mergers
• The origin of prolate rotation in dwarf spheroidal galaxies formed by mergers of disky dwarfs
• The shapes and alignments of the satellites of the Milky Way and Andromeda
• Testing Lorentz invariance of dark matter with satellite galaxies
• The proper motion of stars in dwarf galaxies: distinguishing central density cusps from cores
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