SIMBAD references

2016ApJ...824L..14C - Astrophys. J., 824, L14-L14 (2016/June-2)

Deep imaging of Eridanus II and its lone star cluster.

CRNOJEVIC D., SAND D.J., ZARITSKY D., SPEKKENS K., WILLMAN B. and HARGIS J.R.

Abstract (from CDS):

We present deep imaging of the most distant dwarf discovered by the Dark Energy Survey, Eridanus II (Eri II). Our Magellan/Megacam stellar photometry reaches ∼3 mag deeper than previous work and allows us to confirm the presence of a stellar cluster whose position is consistent with Eri II's center. This makes Eri II, at {M}_{V}=-7.1 , the least luminous galaxy known to host a (possibly central) cluster. The cluster is partially resolved, and at {M}_{V}=-3.5 it accounts for ∼4% of Eri II's luminosity. We derive updated structural parameters for Eri II, which has a half-light radius of ∼280 pc and is elongated (ε ∼ 0.48) at a measured distance of D ∼ 370 kpc. The color-magnitude diagram displays a blue, extended horizontal branch, as well as a less populated red horizontal branch. A central concentration of stars brighter than the old main-sequence turnoff hints at a possible intermediate-age (∼3 Gyr) population; alternatively, these sources could be blue straggler stars. A deep Green Bank Telescope observation of Eri II reveals no associated atomic gas.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: dwarf - galaxies: individual: Eridanus II - galaxies: photometry - galaxies: stellar content

Simbad objects: 11

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2019.10.21-08:21:00

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