Browsing by Author "Órdenes Briceño, Yasna"

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    A Collection of New Dwarf Galaxies in NGC 5128's Western Halo
    (2018) Órdenes Briceño, Yasna
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    The fornax cluster VLT spectroscopic survey - I. VIMOS spectroscopy of compact stellar systems in the fornax core region
    (2018) Pota, V.; Napolitano, N.R.; Hilker, M.; Spavone, M.; Schulz, C.; Cantiello, M.; Totora, C.; Lodice, C.; Paolillo, M.; Órdenes Briceño, Yasna
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    The Next Generation Fornax Survey (NGFS). III. Revealing the Spatial Substructure of the Dwarf Galaxy Population Inside Half of Fornax's Virial Radius
    (2018) Órdenes Briceño, Yasna; Eigenthaler, Paul; Taylor, Matthew A.; Puzia, Thomas H.; Alamo-Martinez, Karla; Ribbeck, Karen X.; Munoz, Roberto P.; Zhang, Hongxin; Grebel, Eva K.; Ángel Ángel, Simón Andrés; Cote, Patrick; Ferrarese, Laura; Hilker, Michael; Lancon, Ariane; Mieske, Steffen; Miller, Bryan W.; Rong, Yu; Sanchez-Janssen, Ruben
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    The Next Generation Fornax Survey (NGFS). IV. Mass and Age Bimodality of Nuclear Clusters in the Fornax Core Region
    (2018) Órdenes Briceño, Yasna; Puzia, Thomas H.; Eigenthaler, Paul; Taylor, Matthew A.; Munoz, Roberto P.; Zhang, Hongxin; Alamo-Martinez, Karla; Ribbeck, Karen X.; Grebel, Eva K.; Ángel Ángel, Simón Andrés; Cote, Patrick; Ferrarese, Laura; Hilker, Michael; Lancon, Ariane; Mieske, Steffen; Miller, Bryan W.; Rong, Yu; Sanchez-Janssen, Ruben
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    The next generation fornax survey (NGFS). V. Discovery of a dwarf-dwarf galaxy pair at z=0.30 and its characterization using deep VLT/MUSE observations
    (2019) Johnston, E.J.; Eigenthaler, Paul; Puzia, Thomas H.; Órdenes Briceño, Yasna; Taylor, M.A.; Alamo Martinez, K.; Cote, P.; Galaz, Gaspar; Grebel, E.K.; Rong, Y.; Johnston, E.J.; Eigenthaler, Paul; Puzia, Thomas H.; Órdenes Briceño, Yasna; Taylor, M.A.; Alamo Martinez, K.; Cote, P.; Galaz, Gaspar; Grebel, E.K.; Rong, Y.
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    The Next Generation Fornax Survey (NGFS): VII. A MUSE view of the nuclear star clusters in Fornax dwarf galaxies
    (OUP, 2020) Órdenes Briceño, Yasna
    Clues to the formation and evolution of nuclear star clusters (NSCs) lie in their stellar populations. However, these structures are often very faint compared to their host galaxy, and spectroscopic analysis of NSCs is hampered by contamination of light from the rest of the system. With the introduction of wide-field integral field unit (IFU) spectrographs, new techniques have been developed to model the light from different components within galaxies, making it possible to cleanly extract the spectra of the NSCs and study their properties with minimal contamination from the light of the rest of the galaxy. This work presents the analysis of the NSCs in a sample of 12 dwarf galaxies in the Fornax Cluster observed with the Multi-Unit Spectroscopic Explorer (MUSE). Analysis of the stellar populations and star formation histories reveal that all the NSCs show evidence of multiple episodes of star formation, indicating that they have built up their mass further since their initial formation. The NSCs were found to have systematically lower metallicities than their host galaxies, which is consistent with a scenario for mass assembly through mergers with infalling globular clusters, whilst the presence of younger stellar populations and gas emission in the core of two galaxies is indicative of in-situ star formation. We conclude that the NSCs in these dwarf galaxies likely originated as globular clusters that migrated to the core of the galaxy that have built up their mass mainly through mergers with other infalling clusters, with gas-inflow leading to in-situ star formation playing a secondary role.
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    The Relation Between Globular Cluster Systems and Supermassive Black Holes in Spiral Galaxies: The Case Study of NGC 4258
    (2017) González-Lópezlira, Rosa A.; Lomelí Núñez, Luis; Álamo Martínez, Karla; Órdenes Briceño, Yasna; Loinard, Laurent; Georgiev, Iskren Y.; Muñoz, Roberto P.; Puzia, Thomas H.; Bruzual, Gustavo A.; Gwyn, Stephen
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    Unveiling the architecture of the Fornax galaxy cluster with its different stellar systems
    (2018) Órdenes Briceño, Yasna; Puzia, Thomas H.; Grebel, Eva K.; Pontificia Universidad Católica de Chile. Facultad de Física
    A crucial question in astronomy is how galaxies assemble their mass over cosmic time. In this thesis, we focus on the Fornax Galaxy Cluster as a laboratory to study galaxy evolution processes, as it is the second closest galaxy cluster which allows a detailed view of its cluster members. It hosts a variety of stellar systems from giant galaxies to dwarf galaxies and more compact and dense ones such as globular clusters and ultra-compact dwarf galaxies which we call compact stellar systems (CSSs). We use data from the Next Generation Fornax Survey (NGFS) with optical imaging obtained with the Dark Energy Camera (DECam) mounted at Blanco/CTIO and near-infrared data obtained with VIRCam at VISTA/ESO. This data provides deep and homogeneous photometry in u'g'i' JKs spatially covering the Fornax cluster out to half its virial radius. We investigate the properties of nucleated dwarf galaxies and compact stellar systems in the Fornax core region (r < 0.25rvir). Furthermore, we study the dwarf galaxy population with MB > −16 in the outer region of Fornax at radii of 0.25 < r/rvir < 0.5. The main results of this thesis are as follows: (1) We have discovered 271 previously undetected dwarf galaxies in the outer Fornax cluster region, increasing the total Fornax dwarf galaxy population from NGFS and other catalogs to a total number of 643 dwarfs with 181 being nucleated. (2) The study of 61 nuclear star clusters in dwarf galaxies showed that the nuclei have a bimodal mass distribution and that the scaling relation between nucleus mass and host galaxy mass holds for dwarf galaxies but at a less steep slope compared to brighter galaxies. The mass ratio Mnuc/Mgal shows a clear anticorrelation with Mgal for the lowest masses, reaching up to 10%. (3) A total of 1666 CSS candidates have been studied in the core region of Fornax, being the most clean photometrically selected sample using support vector machine techniques. Age, metallicity and mass were estimated for each CSS. A division of the properties in subgroups showed that the metal poor and old CSSs are sparsely distributed, intermediate metallicity and young CSSs are preferentially located along the East-West direction of Fornax centered in NGC 1399 and the most metal rich CSSs are concentrated in the vicinity of NGC 1399 and around the brightest galaxies. These different distributions for the metallicity and age subgroups allow us to constrain the mass assembly history of the Fornax Cluster. (4) Besides the Fornax cluster, we also discover five very diverse dwarf galaxies in another region of the sky, i.e. Hickson Compact Group 90 (HCG 90). Two of these dwarfs are a dwarf galaxy pair and one is a nucleated dwarf galaxy. According to their luminosity and structural parameters, they are similar to the dwarf galaxies we found in Fornax.