Discovery of an extended, halo-like stellar population around the Large Magellanic Cloud

Details Discovery of an extended, halo-like stellar population around the Large Magellanic Cloud Discovery of an extended, halo-like stellar population around the Large Magellanic Cloud

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iaus..256...51m&link_type=abstract

The Magellanic System: Stars, Gas, and Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 256,

Astronomy and Astrophysics

Astronomy

10

Surveys, Galaxies: Evolution, Galaxies: Halos, Galaxies: Individual (Lmc), Magellanic Clouds, Galaxies: Structure

Scientific paper

We describe an ongoing, large-scale, photometric and spectroscopic survey of the Large Magellanic Cloud (LMC) periphery. This survey uses Washington M, T2 + DDO51 photometry to identify distant LMC red giant branch (RGB) star candidates; multi-object spectroscopy is used to confirm the stellar surface gravities of these RGB stars and their association with the LMC (e.g., through radial velocities). The survey now encompasses hundreds of fields ranging from the LMC center with full azimuthal coverage around the LMC and out to 23° from the LMC center. We have confirmed the existence of RGB stars with (the unusual) Magellanic velocities out to the radial limit of this survey coverage. From data in a subsample of these fields, we show that this extended population of stars makes up a diffuse structure enveloping the LMC with a two-dimensional distribution resembling a classical halo with a shallow de Vaucouleurs profile and a broad metallicity spread around a typical mean value of [Fe/H] ~ -1.0.

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