NGC 2419 -- Another Remnant of Accretion by the Milky Way

Details NGC 2419 -- Another Remnant of Accretion by the Milky Way NGC 2419 -- Another Remnant of Accretion by the Milky Way

2010-09-30

arxiv.org/abs/1010.0031v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted to the Astrophysical Journal

Scientific paper

We isolate a sample of 43 upper RGB stars in the extreme outer halo Galactic globular cluster NGC 2419 from two Keck/DEIMOS slitmasks. The probability that there is more than one contaminating halo field star in this sample is extremely low. Analysis of moderate resolution spectra of these cluster members, as well as of our Keck/HIRES high resolution spectra of a subsample of them, demonstrates that there is a small but real spread in Ca abundance of ~ 0.2 dex within this massive metal-poor globular cluster. This provides additional support to earlier suggestions that NGC 2419 is the remnant of a dwarf galaxy accreted long ago by the Milky Way.

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