Navegação por Autor "Wechsler, Risa H."
Resultados 1-20 de 22
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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 ... -
DES13S2cmm : the first superluminous supernova from the Dark Energy Survey
(2015) [Artigo de periódico]We present DES13S2cmm, the first spectroscopically-confirmed superluminous supernova (SLSN) from the Dark Energy Survey (DES).We briefly discuss the data and search algorithm used to find this event in the first year of ... -
DES J0454−4448 : discovery of the first luminous z ≥ 6 quasar from the Dark Energy Survey
(2015) [Artigo de periódico]We present the first results of a survey for high-redshift, z ≥ 6, quasars using izY multicolour photometric observations from the Dark Energy Survey (DES). Here we report the discovery and spectroscopic confirmation of ... -
Detecting massive galaxies at high redshift using the Dark Energy Survey
(2013) [Artigo de periódico]The Dark Energy Survey (DES) will be unprecedented in its ability to probe exceptionally large cosmic volumes to relatively faint optical limits. Primarily designed for the study of comparatively low-redshift (z<2) galaxies ... -
Discovery of two gravitationally lensed quasars in the Dark Energy Survey
(2015) [Artigo de periódico]We present spectroscopic confirmation of two new gravitationally lensed quasars, discovered in the Dark Energy Survey (DES) and Wide-field Infrared Survey Explorer (WISE) based on their multiband photometry and extended ... -
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.) ... -
Galaxy clustering, photometric redshifts and diagnosis of systematics in the DES Science Verification data
(2016) [Artigo de periódico]We study the clustering of galaxies detected at i < 22.5 in the Science Verification observations of the Dark Energy Survey (DES). Two-point correlation functions are measured using 2.3×106 galaxies over a contiguous 116 ... -
Mapping and simulating systematics due to spatially varying observing conditions in DES Science Verification data
(2016) [Artigo de periódico]Spatially varying depth and the characteristics of observing conditions, such as seeing, airmass, or sky background, are major sources of systematic uncertainties in modern galaxy survey analyses, particularly in deep ... -
Mass and galaxy distributions of four massive galaxy clusters from Dark Energy Survey Science Verification data
(2015) [Artigo de periódico]We measure the weak lensing masses and galaxy distributions of four massive galaxy clusters observed during the Science Verification phase of the Dark Energy Survey (DES). This pathfinder study is meant to (1) validate the ... -
Modeling the transfer function for the Dark Energy Survey
(2015) [Artigo de periódico]We present a forward-modeling simulation framework designed to model the data products from the Dark Energy Survey (DES). This forward-model process can be thought of as a transfer function—amapping from cosmological/ ... -
A new Milk Way halo star cluster in the southern galactic sky
(2013) [Artigo de periódico]We report on the discovery of a new Milky Way (MW) companion stellar system located at (αJ 2000, δJ 2000) = (22h10 m 43 s. 15,14º56'58".8). The discovery was made using the eighth data release of SDSS after applying an ... -
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 ... -
Star/galaxy separation at faint magnitudes : application to a simulated Dark Energy Survey
(2015) [Artigo de periódico]We address the problem of separating stars from galaxies in future large photometric surveys. We focus our analysis on simulations of the Dark Energy Survey (DES). In the first part of the paper, we derive the science ... -
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 ... -
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 ...
