Discovery of a loose star cluster in the Large Magellanic Cloud

Abstract

We present results for an up-to-date uncatalogued star cluster projected towards the Eastern side of the Large Magellanic Cloud (LMC) outer disc. The new object was discovered from a search of loose star cluster in the Magellanic Clouds' (MCs) outskirts using kernel density estimators on Washington CT1 deep images. Contrarily to what would be commonly expected, the star cluster resulted to be a young object (log(t /yr) = 8.45) with a slightly subsolar metal content (Z = 0.013) and a total mass of 650Mo. Its core, half-mass and tidal radii also are within the frequent values of LMC star clusters. However, the new star cluster is placed at the Small Magellanic Cloud distance and at 11.3 kpc from the LMC centre. We speculate with the possibility that it was born in the inner body of the LMC and soon after expeled into the intergalactic space during the recent Milky Way/MCs interaction. Nevertheless, radial velocity and chemical abundance measurements are needed to further understand its origin, as well as extensive search for loose star clusters in order to constrain the effectiveness of star cluster scattering during galaxy interactions.

MNRAS Letters, 5 pages, 2 figures (in press)

References in corpus (8)

• Introduction to astroML: Machine Learning for Astrophysics
• New Optical Reddening Maps of the Large and Small Magellanic Clouds
• ASteCA - Automated Stellar Cluster Analysis
• The Magellanic Stream System: I. Ram-pressure tails and the relics of the collision between the Magellanic Clouds
• Stellar streams around the Magellanic Clouds
• The VMC survey - XV. The Small Magellanic Cloud--Bridge connection history as traced by their star cluster populations
• Recent Star Formation in the Leading Arm of the Magellanic Stream
• H I Kinematics of the Large Magellanic Cloud revisited : Evidence of possible infall and outflow

Cited by in corpus (8)

• Star cluster formation history along the minor axis of the Large Magellanic Cloud
• Young stars in the periphery of the Large Magellanic Cloud
• Stellar cluster candidates discovered in the Magellanic System
• An Analysis of the Population of Extended Main Sequence Turn-off Clusters in the Large Magellanic Cloud
• The real population of star clusters in the bar of the Large Magellanic Cloud
• Astrophysical properties of newly discovered Magellanic Cloud star clusters
• A likely runaway star cluster in the outer disc of the Large Magellanic Cloud
• Sizing the star cluster population of the Large Magellanic Cloud