Tidal scars of the Small Magellanic Cloud Virtual Observatory Resource

Authors
  1. De Leo M.
  2. Carrera R.
  3. Noel N.E.D.
  4. Read J.I.
  5. Erkal D.
  6. Gallart C.
  7. Published by
    CDS
Abstract

Due to their close proximity, the Large and Small Magellanic Clouds (LMC/SMC) provide natural laboratories for understanding how galaxies form and evolve. With the goal of determining the structure and dynamical state of the SMC, we present new spectroscopic data for ~3000 SMC red giant branch stars observed using the AAOmega spectrograph at the Anglo-Australian Telescope. We complement our data with further spectroscopic measurements from previous studies that used the same instrumental configuration as well as proper motions from the Gaia Data Release 2 catalogue. Analysing the photometric and stellar kinematic data, we find that the SMC centre of mass presents a conspicuous offset from the velocity centre of its associated HI gas, suggesting that the SMC gas is likely to be far from dynamical equilibrium. Furthermore, we find evidence that the SMC is currently undergoing tidal disruption by the LMC within 2kpc of the centre of the SMC, and possibly all the way into the very core. This is revealed by a net outward motion of stars from the SMC centre along the direction towards the LMC and an apparent tangential anisotropy at all radii. The latter is expected if the SMC is undergoing significant tidal stripping, as we demonstrate using a suite of N-body simulations of the SMC/LMC system disrupting around the Milky Way. Our results suggest that dynamical models for the SMC that assume a steady state will need to be revisited.

Keywords
  1. Magellanic Clouds
  2. Giant stars
  3. Astrometry
  4. Radial velocity
  5. Optical astronomy
  6. Spectroscopy
  7. Infrared astronomy
Bibliographic source Bibcode
2020MNRAS.495...98D
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/495/98
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/495/98

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/495/98
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/495/98
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/495/98
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/495/98/tablea1?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/495/98/tablea1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/495/98/tablea1?

History

2023-09-04T08:56:11Z
Resource record created
2023-09-04T08:56:11Z
Created
2024-01-15T11:08:31Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr