SIMBAD references

2015ApJ...810...56K - Astrophys. J., 810, 56 (2015/September-1)

Spectroscopic confirmation of the dwarf galaxies Hydra II and Pisces II and the globular cluster laevens 1.


Abstract (from CDS):

We present Keck/DEIMOS spectroscopy of stars in the recently discovered Milky Way satellites Hydra II, Pisces II, and Laevens 1. We measured a velocity dispersion of km/s for Pisces II, but we did not resolve the velocity dispersions of Hydra II or Laevens 1. We marginally resolved the metallicity dispersions of Hydra II and Pisces II but not Laevens 1. Furthermore, Hydra II and Pisces II obey the luminosity-metallicity relation for Milky Way dwarf galaxies ( and, respectively), whereas Laevens 1 does not (). The kinematic and chemical properties suggest that Hydra II and Pisces II are dwarf galaxies, and Laevens 1 is a globular cluster. We determined that two of the previously observed blue stars near the center of Laevens 1 are not members of the cluster. A third blue star has ambiguous membership. Hydra II has a radial velocity km/s, similar to the leading arm of the Magellanic stream. The mass-to-light ratio for Pisces II is. It is not among the most dark matter-dominated dwarf galaxies, but it is still worthy of inclusion in the search for gamma-rays from dark matter self-annihilation.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: dwarf - Local Group

Nomenclature: Table 2: [KSC2015] Hydra II NNNNNN N=34 among (Nos 183842-202029), [KSC2015] Laevens 1 NNN N=14 among (Nos 93-1997).

Simbad objects: 85

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