Deep imaging of Eridanus II and its lone star cluster

  title={Deep imaging of Eridanus II and its lone star cluster},
  author={Denija Crnojevi'c and David J. Sand and Dennis Zaritsky and Kristine Spekkens and Beth Willman and Japan Department of Physics and Texas Tech University and Lubbock and Tx and Usa and Steward Observatory and University of Arizona and Tucson and Az and Royal Military College of Canada and Dep. of Physics and Kingston and on and Canada. and Lsst and Haverford College and Dep. of Physics and Astronomy and Haverford and Pa and Space Telescope Science Institute and Baltimore. and Md.},
  journal={arXiv: Astrophysics of Galaxies},
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 $\sim$$3$ mag deeper than previous work, and allows us to confirm the presence of a stellar cluster whose position is consistent with Eri II's center. This makes Eri II, at $M_V=-7.1$, the least luminous galaxy known to host a (possibly central) cluster. The cluster is partially resolved, and at $M_V=-3.5$ it accounts for $\sim$$4\%$ of… 

Figures and Tables from this paper

Eridanus II: A Fossil from Reionization with an Off-center Star Cluster
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf galaxy Eridanus II (Eri II). Eri II, which has an absolute magnitude of M V = −7.1, is located at a distance of 339
The Faint End of the Centaurus A Satellite Luminosity Function
The Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS) is constructing a wide-field map of the resolved stellar populations in the extended halos of these two nearby, prominent galaxies. We
Deep Subaru Hyper Suprime-Cam observations of Milky Way satellites Columba I and Triangulum II
We present deep, wide-field Subaru Hyper Suprime-Cam photometry of two recently discovered satellites of the Milky Way (MW): Columba I and Triangulum II. The color magnitude diagrams of both objects
Farthest Neighbor: The Distant Milky Way Satellite Eridanus II*
We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite Eridanus II (Eri II). We identify 28 member stars in Eri II, from which we measure a systemic radial velocity of
Deadly dark matter cusps vs faint and extended star clusters: Eridanus II and Andromeda XXV
The recent detection of two faint and extended star clusters in the central regions of two Local Group dwarf galaxies, Eridanus II and Andromeda XXV, raises the question of whether clusters with such
An extended halo around an ancient dwarf galaxy
The Milky Way is surrounded by dozens of ultra-faint ( 2 half-light radii), which are spectroscopically unstudied due to the sparseness of their distant stars. Here we identify members of the Tucana
Search for globular clusters associated with the Milky Way dwarf galaxies using Gaia DR2
We report the result of searching for globular clusters (GCs) around 56 Milky Way satellite dwarf galaxies within the distance of 450 kpc from the Galactic Center except for the Large and Small
A Deeper Look at DES Dwarf Galaxy Candidates: Grus i and Indus ii
We present deep g- and r-band Magellan/Megacam photometry of two dwarf galaxy candidates discovered in the Dark Energy Survey (DES), Grus i and Indus ii (DES J2038–4609). For the case of Grus i, we
A Deeper Look at the New Milky Way Satellites: Sagittarius II, Reticulum II, Phoenix II, and Tucana III
We present deep Magellan/Megacam stellar photometry of four recently discovered faint Milky Way satellites: Sagittarius II (Sgr II), Reticulum II (Ret II), Phoenix II (Phe II), and Tucana III (Tuc
Estimating the GeV Emission of Millisecond Pulsars in Dwarf Spheroidal Galaxies
We estimate the conventional astrophysical emission from dwarf spheroidal satellite galaxies (dSphs) of the Milky Way, focusing on millisecond pulsars (MSPs), and evaluate the potential for confusion


Unveiling a Rich System of Faint Dwarf Galaxies in the Next Generation Fornax Survey
We report the discovery of 158 previously undetected dwarf galaxies in the Fornax cluster central regions using a deep coadded $u, g$ and $i$-band image obtained with the DECam wide-field camera
The extended halo of Centaurus A: uncovering satellites, streams, and substructures
We present the widest-field resolved stellar map to date of the closest ($D\sim3.8$ Mpc) massive elliptical galaxy NGC 5128 (Centaurus A; Cen A), extending out to a projected galactocentric radius of
The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater
We announce the discovery of the Crater 2 dwarf galaxy, identified in imaging data of the VST ATLAS survey. Given its half-light radius of ~1100 pc, Crater 2 is the fourth largest dwarf in the Milky
A New Faint Milky Way Satellite Discovered in the Pan-STARRS1 3π Survey
We present the discovery of a faint Milky Way satellite, Laevens 2/Triangulum II, found in the Panoramic Survey Telescope And Rapid Response System (Pan-STARRS 1) 3 pi imaging data and confirmed with
ATLAS lifts the Cup: discovery of a new Milky Way satellite in Crater
We announce the discovery of a new Galactic companion found in data from the ESO VST ATLAS survey, and followed up with deep imaging on the 4-m William Herschel Telescope. The satellite is located in
Hydra II: a faint and compact milky way dwarf galaxy found in the survey of the magellanic stellar history
© 2015. The American Astronomical Society. All rights reserved.We present the discovery of a new dwarf galaxy, Hydra II, found serendipitously within the data from the ongoing Survey of the
We report the discovery of an ultra-faint Milky Way satellite galaxy in the constellation of Pegasus. The concentration of stars was detected by applying our overdensity detection algorithm to the
Eight new Milky Way companions discovered in first-year Dark Energy Survey data
We report the discovery of eight new Milky Way companions in ~1,800 deg^2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a
We present MMT/Megacam imaging of the Leo IV dwarf galaxy in order to investigate its structure and star formation history, and to search for signs of association with the recently discovered Leo V
We report the discovery of a new ultra-faint Milky Way satellite candidate, Horologium II (Hor II), detected in the Dark Energy Survey Y1A1 public data. Hor II features a half-light radius of pc and