Navegação Ciências Exatas e da Terra por Assunto "Halos"
Resultados 1-16 de 16
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Cartography of Triangulum-Andromeda using SDSS stars
(2018) [Artigo de periódico]The outer Galactic halo is home to a number of substructures which still have an uncertain origin, but most likely are remnants of former interactions between the Galaxy and its former satellites. Triangulum-Andromeda ... -
Deep SOAR follow-up photometry of two Milky Way outer-halo companions discovered with Dark Energy Survey
(2018) [Artigo de periódico]We report the discovery of a new star cluster, DES 3, in the constellation of Indus, and deeper observations of the previously identified satellite DES J0222.7−5217 (Eridanus III). DES 3 was detected as a stellar overdensity ... -
Halo intruders in the Galactic bulge revealed by HST and Gaia : the globular clusters Terzan 10 and Djorgovski 1
(2019) [Artigo de periódico]Context. The low-latitude globular clusters Terzan 10 and Djorgovski 1 are projected in the Galactic bulge, in a Galactic region highly affected by extinction. A discrepancy of a factor of ∼2 exists in the literature in ... -
Mapping the differential reddening in globular clusters
(2013) [Artigo de periódico]We build differential-reddening maps for 66 Galactic globular clusters (GCs) with archival Hubble Space Telescope WFC/ACS F606W and F814W photometry. Because of the different GC sizes (characterized by the half-light radius ... -
Milky Way satellite census : II. Galaxy–halo connection constraints including the impact of the Large Magellanic Cloud
(2020) [Artigo de periódico]The population of Milky Way (MW) satellites contains the faintest known galaxies and thus provides essential insight into galaxy formation and dark matter microphysics. Here we combine a model of the galaxy–halo connection ... -
Modelling the Milky Way : I. Method and first results fitting the thick disc and halo with DES-Y3 data
(2020) [Artigo de periódico]We present a technique to fit the stellar components of the Galaxy by comparing Hess Diagrams (HDs) generated from TRILEGAL models to real data. We apply this technique, which we call MWFITTING, to photometric data from ... -
New detections of embedded clusters in the Galactic halo
(2016) [Artigo de periódico]Context. Until recently it was thought that high Galactic latitude clouds were a non-star-forming ensemble. However, in a previous study we reported the discovery of two embedded clusters (ECs) far away from the Galactic ... -
Off-axis stability of intense continuous relativistic beams
(2009) [Artigo de periódico]This paper investigates the stability of off-axis continuous intense relativistic beams propagating inside a circular conducting pipe. The equations of motion for the centroid and the envelope of slightly off-axis beams ... -
Relaxation of intense inhomogeneous charged beams
(2009) [Artigo de periódico]This work analyzes the dynamics of inhomogeneous, magnetically focused high intensity beams of charged particles. Initial inhomogeneities lead to density waves propagating transversely in the beam core, and the presence ... -
SDSS-IV MaNGA : inside-out versus outside-in quenching of galaxies in different local environments
(2019) [Artigo de periódico]The large Integral Field Spectroscopy surveys have allowed the classification of ionizing sources of emission lines on sub-kiloparsec scales. In this work, we define two non-parametric parameters, quiescence (Fq) and its ... -
Segue 3 : the youngest globular cluster in the outer halo
(2013) [Artigo de periódico]Deep Galileo (Telescopio Nazionale Galileo) B, V and I images of Segue 3, reaching V ∼ 25, reveal that it is the youngest globular cluster known so far in the Galaxy.Ayoung age of 3.2 Gyr is found, differently from a ... -
SMC west halo : a slice of the galaxy that is being tidally stripped? Star clusters trace age and metallicity gradients
(2016) [Artigo de periódico]Context. The evolution and structure of the Magellanic Clouds is currently under debate. The classical scenario in which both the Large and Small Magellanic Clouds (LMC, SMC) are orbiting the Milky Way has been challenged ... -
Stellar streams discovered in the Dark Energy Survey
(2018) [Artigo de periódico]We perform a search for stellar streams around the Milky Way using the first 3 yr of multiband optical imaging data from the Dark Energy Survey (DES). We use DES data covering ∼5000 deg2 to a depth of g>23.5 with a ... -
Super metal-rich clusters g158 and g177 in m31 : clues on the inner bulge/disc transition
(1992) [Artigo de periódico]The star clusters G 158 and G 177, located at projected distances smaller than 1.5 kpc from the semi-stellar nucleus of M 31, show spectra extreme in absorption-line strengths, comparable to those from the nuclei of giant ... -
The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
(2018) [Artigo de periódico]Context. In the hierarchical two-phase formation scenario, the halos of early type galaxies (ETGs) are expected to have different physical properties from the galaxies’ central regions. Aims. The ePN.S survey characterizes ... -
The statistics of ΛCDM halo concentrations
(2007) [Artigo de periódico]We use the Millennium Simulation (MS) to study the statistics of Λ cold dark matter (ΛCDM) halo concentrations at z = 0. Our results confirm that the average halo concentration declines monotonically with mass; the ...
