Browsing Exact and Earth Sciences by Subject "Galáxias anãs"
Now showing items 1-14 of 14
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Birds of a Feather? : Magellan/IMACS spectroscopy of the ultra-faint satellites Grus II, Tucana IV, and Tucana V
(2020) [Journal article]We present Magellan/IMACS spectroscopy of three recently discovered ultra-faint Milky Way satellites, Grus II, Tucana IV, and Tucana V. We measure systemic velocities of vhel =- 110.0 0.5 - km s 1 , = - + vhel 15.9 1.7 ... -
Chemical abundance analysis of Tucana III, the second r-process enhanced ultra-faint dwarf galaxy
(2019) [Journal article]We present a chemical abundance analysis of four additional confirmed member stars of Tucana III, a Milky Way satellite galaxy candidate in the process of being tidally disrupted as it is accreted by the Galaxy. Two of ... -
MaNGA 8313-1901 : gas accretion observed in a blue compact dwarf galaxy
(2022) [Journal article]Gas accretion is an important process in the evolution of galaxies, but it has limited direct observational evidences. In this paper, we report the detection of a possible ongoing gas accretion event in a blue compact dwarf ... -
SDSS J124043.01+671034.68 : the partially burned remnant of a low-mass white dwarf that underwent thermonuclear ignition?
(2020) [Journal article]The white dwarf SDSS J124043.01+671034.68 (SDSS J1240+6710) was previously found to have an oxygen-dominated atmosphere with significant traces of neon, magnesium, and silicon. A possible origin via a violent late thermal ... -
A search for faint resolved galaxies beyond the Milky Way in DES year 6 : a new faint, diffuse dwarf satellite of NGC 55
(2024) [Journal article]We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full 6 yr of data from the Dark Energy Survey (DES). Unlike previous searches over the DES ... -
Search for RR Lyrae stars in DES ultrafaint systems : Grus I, Kim 2, Phoenix II, and Grus II
(2019) [Journal article]This work presents the first search for RR Lyrae stars (RRLs) in four of the ultrafaint systems imaged by the Dark Energy Survey using SOAR/Goodman and Blanco/DECam imagers. We have detected two RRLs in the field of Grus ... -
The Curious Case of PHL 293B : a long-lived transient in a Metal-poor Blue Compact Dwarf Galaxy
(2020) [Journal article]We report on small-amplitude optical variability and recent dissipation of the unusually persistent broad emission lines in the blue compact dwarf galaxy PHL 293B. The galaxy's unusual spectral features (P Cygni-like ... -
The first tidally disrupted ultra-faint dwarf galaxy? : a spectroscopic analysis of the Tucana III stream
(2018) [Journal article]We present a spectroscopic study of the tidal tails and core of the Milky Way satellite Tucana III, collectively referred to as the Tucana III stream, using the 2dF+AAOmega spectrograph on the Anglo-Australian Telescope ... -
The frequency of very young galaxies in the local Universe : II. The view from SDSS spectra
(2020) [Journal article]Only a handful of galaxies in the local Universe appear to be very young. We estimate the fraction of very young galaxies (VYGs), defined as those with more than half their stellar masses formed within the last Gyr. We fit ... -
The metal-poor dwarf irregular galaxy candidate next to Mrk 1172
(2021) [Journal article]In this work, we characterize the properties of the object SDSS J020536.84−081424.7, an extended nebular region with projected extension of 14 × 14 kpc2 in the line of sight of the ETG Mrk 1172, using unprecedented ... -
The morphology and structure of stellar populations in the Fornax dwarf spheroidal galaxy from dark energy survey data
(2019) [Journal article]Using deep wide-field photometry 3 yr data (Y3) from the Dark Energy Survey (DES), we present a panoramic study of the Fornax dwarf spheroidal galaxy. The data presented here—a small subset of the full survey—uniformly ... -
The properties and environment of very young galaxies in the local Universe
(2021) [Journal article]In the local Universe, there are a handful of dwarf compact star-forming galaxies with extremely low oxygen abundances. It has been proposed that they are young, having formed a large fraction of their stellar mass during ... -
The VISCACHA survey : VIII. Chemical evolution history of the small Magellanic cloud west halo clusters
(2023) [Journal article]The chemical evolution history of the Small Magellanic Cloud (SMC) has been a matter of debate for decades. The challenges in understanding the SMC chemical evolution are related to a very slow star formation rate (SFR) ... -
Timing the r-process enrichment of the ultra-faint dwarf galaxy Reticulum II
(2023) [Journal article]The ultra-faint dwarf galaxy Reticulum II (Ret II) exhibits a unique chemical evolution history, with - + 72 12 10% of its stars strongly enhanced in r-process elements. We present deep Hubble Space Telescope photometry ...