Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey

  title={Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey},
  author={S. Mau and William Cerny and Andrew B. Pace and Y. Choi and Alex Drlica-Wagner and Luidhy Santana-Silva and Alexander H Riley and Denis Erkal and Guy S. Stringfellow and Monika Adam'ow and Jeffrey L. Carlin and Robert A. Gruendl and D. Hernandez-Lang and N. Kuropatkin and T. S. Li and Clara E. Mart'inez-V'azquez and E. Morganson and Burçin Mutlu-Pakdil and Eric H. Neilsen and David L. Nidever and K. A. G. Olsen and David J. Sand and Erik J. Tollerud and Douglas L. Tucker and Brian Yanny and A Zenteno and Sahar Allam and Wayne A. Barkhouse and Keith C. Bechtol and Eric F. Bell and P. Balaji and Denija Crnojevi'c and J. Esteves and P. S. Ferguson and Carme Gallart and Allison K. Hughes and David J. James and P. Jethwa and L. Clifton Johnson and Kyler W. Kuehn and Steven R. Majewski and Y.-Y. Mao and Pol Massana and Mitch McNanna and Antonela Monachesi and Ethan O. Nadler and Noelia E. D. No{\"e}l and Antonella Palmese and Francisco Paz-Chinch{\'o}n and A. Pieres and J. S{\'a}nchez and N. Shipp and Joshua D. Simon and Marcelle Soares-Santos and Kiyan Tavangar and Roeland P. van der Marel and Anna Katherina Vivas and Alistair R. Walker and Risa H. Wechsler},
  journal={arXiv: Astrophysics of Galaxies},
We report the discovery of two ultra-faint stellar systems found in early data from the DECam Local Volume Exploration survey (DELVE). The first system, Centaurus I (DELVE J1238-4054), is identified as a resolved overdensity of old and metal-poor stars with a heliocentric distance of ${\rm D}_{\odot} = 116.3_{-0.6}^{+0.6}$ kpc, a half-light radius of $r_h = 2.3_{-0.3}^{+0.4}$ arcmin, an age of $\tau > 12.85$ Gyr, a metallicity of $Z = 0.0002_{-0.0002}^{+0.0001}$, and an absolute magnitude of… Expand

Figures and Tables from this paper

Eridanus IV: an Ultra-faint Dwarf Galaxy Candidate Discovered in the DECam Local Volume Exploration Survey
We present the discovery of a candidate ultra-faint Milky-Way satellite, Eridanus IV (DELVE J0505−0931), detected in photometric data from the DECam Local Volume Exploration survey (DELVE). EridanusExpand
Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1
We report the results of a systematic search for ultra-faint Milky Way satellite galaxies using data from the Dark Energy Survey (DES) and Pan-STARRS1 (PS1). Together, DES and PS1 provide multi-bandExpand
RR Lyrae Stars in the Newly Discovered Ultra-faint Dwarf Galaxy Centaurus I
We report the detection of three RR Lyrae (RRL) stars (two RRc and one RRab) in the ultra-faint dwarf (UFD) galaxy Centaurus I (Cen I) and two Milky Way (MW) δ Scuti/SX Phoenicis stars based onExpand
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, weExpand
Resolved Dwarf Galaxy Searches within ∼5 Mpc with the Vera Rubin Observatory and Subaru Hyper Suprime-Cam
We present a preview of the faint dwarf galaxy discoveries that will be possible with the Vera C. Rubin Observatory and Subaru Hyper Suprime-Cam in the next decade. In this work, we combine deepExpand
Hubble Space Telescope Observations of Two Faint Dwarf Satellites of Nearby LMC Analogs from MADCASH* * Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
We present a deep Hubble Space Telescope (HST) imaging study of two dwarf galaxies in the halos of Local Volume Large Magellanic Cloud (LMC) analogs. These dwarfs were discovered as part of ourExpand
SMASHing the low surface brightness SMC
The periphery of the Small Magellanic Cloud (SMC) can unlock important information regarding galaxy formation and evolution in interacting systems. Here, we present a detailed study of the extendedExpand
Tracing satellite planes in the Sculptor group
Context. In the last years, a new generation of large-scale imaging surveys have probed for the first time wide field regions around some nearby galaxies at unprecedented low surface brightnessExpand
The DECam Local Volume Exploration Survey: Overview and First Data Release
The DECam Local Volume Exploration survey (DELVE) is a 126-night survey program on the 4 m Blanco Telescope at the Cerro Tololo Inter-American Observatory in Chile. DELVE seeks to understand theExpand
Searching for Dwarf Galaxies in Gaia DR2 Phase-space Data Using Wavelet Transforms
We present a wavelet-based algorithm to identify dwarf galaxies in the Milky Way in Gaia DR2 data. Our algorithm detects overdensities in 4D position–proper-motion space, making it the first searchExpand


Searches for New Milky Way Satellites from the First Two Years of Data of the Subaru/Hyper Suprime-Cam Survey: Discovery of Cetus~III
We present the results from a search for new Milky Way (MW) satellites from the first two years of data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) $\sim 300$~deg$^2$ and reportExpand
Variable stars in the field of the Hydra II ultra-faint dwarf galaxy
We report the discovery of one RR Lyrae star in the ultra--faint satellite galaxy Hydra II based on time series photometry in the g, r and i bands obtained with the Dark Energy Camera at Cerro TololoExpand
Kim 3: an Ultra-faint Star Cluster in the Constellation of Centaurus
We report the discovery of an ultra-faint star cluster in the constellation of Centaurus. This new stellar system, Kim 3, features a half light radius of $r_{h}=2.29^{+1.28}_{-0.52}$ pc and a totalExpand
Boötes. IV. A new Milky Way satellite discovered in the Subaru Hyper Suprime-Cam Survey and implications for the missing satellite problem
We report on the discovery of a new Milky Way (MW) satellite in Boötes based on data from the ongoing Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP). This satellite, named Boötes IV, is theExpand
A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey
We report the discovery of a new ultra-faint dwarf satellite companion of the Milky Way based on the early survey data from the Hyper Suprime-Cam Subaru Strategic Program. This new satellite, VirgoExpand
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 aExpand
A Faint Halo Star Cluster Discovered in the Blanco Imaging of the Southern Sky Survey
We present the discovery of a faint, resolved stellar system, BLISS J0321+0438 (BLISS 1), found in Dark Energy Camera data from the first observing run of the Blanco Imaging of the Southern SkyExpand
The Dark Energy Survey view of the Sagittarius stream: discovery of two faint stellar system candidates
We report the discovery of two new candidate stellar systems in the constellation of Cetus using the data from the first two years of the Dark Energy Survey (DES). The objects, DES J0111-1341 and DESExpand
On the nature of ultra-faint dwarf galaxy candidates I: DES1, Eridanus III and Tucana V
We use deep Gemini/GMOS-S $g,r$ photometry to study the three ultra-faint dwarf galaxy candidates DES1, Eridanus III (Eri III) and Tucana V (Tuc V). Their total luminosities, $M_V$(DES1) $ =Expand
Dynamical Histories of the Crater II and Hercules Dwarf Galaxies
We investigate the possibility that the dwarf galaxies Crater II and Hercules have previously been tidally stripped by the Milky Way. We present Magellan/IMACS spectra of candidate member stars inExpand