Navegação Ciências Exatas e da Terra por Autor "Drlica-Wagner, Alex"
Resultados 1-17 de 17
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An r -process enhanced star in the dwarf galaxy Tucana III
(2017) [Artigo de periódico]Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly ... -
A dark energy camera search for missing supergiants in the LMC after the advanced LIGO gravitational-wave event GW150914
(2016) [Artigo de periódico]The collapse of a stellar core is expected to produce gravitational waves (GWs), neutrinos, and in most cases a luminous supernova. Sometimes, however, the optical event could be significantly less luminous than a supernova ... -
Digging deeper into the Southern skies : a compact Milky Way companion discovered in first-year Dark Energy Survey data
(2016) [Artigo de periódico]We use the first-year Dark Energy Survey (DES) data down to previously unprobed photometric depths to search for stellar systems in the Galactic halo, therefore complementing the previous analysis of the same data carried ... -
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey
(2016) [Artigo de periódico]We report the discovery of an excess of main-sequence turnoff stars in the direction of the constellations of Eridanus and Phoenix from the first-year data of the Dark Energy Survey (DES). The Eridanus–Phoenix (EriPhe) ... -
Eight new Milky Way companions discovered in first-year Dark Energy Survey data
(2015) [Artigo de periódico]We report the discovery of eight new Milky Way companions in ~1800 deg2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant ... -
Eight ultra-faint galaxy candidates discovered in year two the Dark Energy Survey
(2015) [Artigo de periódico]We report the discovery of eight new ultra-faint dwarf galaxy candidates in the second year of optical imaging data from the Dark Energy Survey (DES). Six of these candidates are detected at high confidence, while two ... -
Farthest neighbor : the distant Milky Way satellite Eridanus II
(2017) [Artigo de periódico]We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite EridanusII (Eri II). We identify 28 member stars in EriII, from which we measure a systemic radial velocity of vhel = 75.6 1.3 (stat.) ... -
Nearest neighbor : the low-mass Milky Way satellite Tucana III
(2017) [Artigo de periódico]We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite TucanaIII (Tuc III). We identify 26 member stars in TucIII from which we measure a mean radial velocity of vhel=−102.3±0.4 (stat.)±2.0(sys.) ... -
Physical properties of star clusters in the outer LMC as observed by the DES
(2016) [Artigo de periódico]The Large Magellanic Cloud (LMC) harbours a rich and diverse system of star clusters, whose ages, chemical abundances and positions provide information about the LMC history of star formation. We use Science Verification ... -
Search for gamma-ray emission from DES dwarf spheroidal galaxy candidates with Fermi-LAT data
(2015) [Artigo de periódico]Due to their proximity, high dark-matter (DM) content, and apparent absence of non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs) are excellent targets for the indirect detection of DM. Recently, ... -
Searching for dark matter annihilation in recently discovered Milky Way satellites with Fermi-LAT
(2017) [Artigo de periódico]We search for excess γ-ray emission coincident with the positions of confirmed and candidate Milky Way satellite galaxies using six years of data from the Fermi Large Area Telescope (LAT). Our sample of 45 stellar systems ... -
Stellar kinematics and metallicities in the ultra-faint dwarf galaxy Reticulum II
(2015) [Artigo de periódico]We present Magellan/M2FS, Very Large Telescope/GIRAFFE, and Gemini South/GMOS spectroscopy of the newly discovered Milky Way satellite Reticulum II. Based on the spectra of 25 Ret II member stars selected from Dark Energy ... -
A stellar overdensity associated with the Small Magellanic Cloud
(2017) [Artigo de periódico]We report the discovery of a stellar overdensity 8◦ north of the centre of the Small Magellanic Cloud (SMC; Small Magellanic Cloud Northern Over-Density; SMCNOD), using data from the first 2 yr of the Dark Energy Survey ... -
The Dark Energy Survey : more than dark energy – an overview
(2016) [Artigo de periódico]This overview paper describes the legacy prospect and discovery potential of the Dark Energy Survey (DES) beyond cosmological studies, illustrating it with examples from the DES early data. DES is using a wide-field camera ... -
The Dark Energy Survey view of the Sagittarius stream : discovery of two faint stellar system candidates
(2017) [Artigo de periódico]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 DES J0225+0304, are located ... -
The DECam Local Volume Exploration Survey Data Release 2
(2022) [Artigo de periódico]We present the second public data release (DR2) from the DECam Local Volume Exploration survey (DELVE). DELVE DR2 combines new DECam observations with archival DECam data from the Dark Energy Survey, the DECam Legacy Survey, ... -
The LMC geometry and outer stellar populations from early DES data
(2015) [Artigo de periódico]The Dark Energy Camera has captured a large set of images as part of Science Verification (SV) for the Dark Energy Survey (DES). The SV footprint covers a large portion of the outer LargeMagellanic Cloud (LMC), providing ...
