Navegação Ciências Exatas e da Terra por Autor "Abbott, Timothy M. C."
Resultados 21-34 de 34
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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 ... -
redMaGiC : selecting luminous red galaxies from the DES Science Verification data
(2016) [Artigo de periódico]We introduce redMaGiC, an automated algorithm for selecting luminous red galaxies (LRGs). The algorithm was specifically developed to minimize photometric redshift uncertainties in photometric large-scale structure studies. ... -
Redshift distributions of galaxies in the Dark Energy Survey Science Verification shear catalogue and implications for weak lensing
(2016) [Artigo de periódico]We present photometric redshift estimates for galaxies used in the weak lensing analysis of the Dark Energy Survey Science Verification (DES SV) data. Four model- or machine learning-based photometric redshift methods—ANNZ2, ... -
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 ... -
A study of quasar selection in the supernova fields of the Dark Energy Survey
(2017) [Artigo de periódico]We present a study of quasar selection using the supernova fields of the Dark Energy Survey (DES). We used a quasar catalog from an overlapping portion of the SDSS Stripe 82 region to quantify the completeness and efficiency ... -
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 evolution of active galactic nuclei in clusters of galaxies from the Dark Energy Survey
(2017) [Artigo de periódico]The correlation between active galactic nuclei (AGNs) and environment provides important clues to AGN fuelling and the relationship of black hole growth to galaxy evolution. In this paper, we analyse the fraction of galaxies ... -
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 ... -
The Phoenix stream : a cold stream in the southern hemisphere
(2016) [Artigo de periódico]We report the discovery of a stellar stream in the Dark Energy Survey Year 1 (Y1A1) data. The discovery was made through simple color–magnitude filters and visual inspection of the Y1A1 data. We refer to this new object ... -
The redMaPPer galaxy cluster catalog from des science verification data
(2016) [Artigo de periódico]We describe updates to the redMaPPer algorithm, a photometric red-sequence cluster finder specifically designed for large photometric surveys. The updated algorithm is applied to 150 deg2 of Science Verification (SV) data ...
