Browsing by Author "Munoz, R."

Now showing 1 - 6 of 6
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    Abundance ratios and IMF slopes in the dwarf elliptical galaxy NGC 1396 with MUSE
    (2016) Mentz, J. J.; La Barbera, F.; Peletier, R. F.; Falcon-Barroso, J.; Lisker, T.; van de Ven, G.; Loubser, S. I.; Hilker, M.; Sanchez-Janssen, R.; Napolitano, N.; Cantiello, M.; Capaccioli, M.; Norris, M.; Paolillo, M.; Smith, R.; Beasley, M. A.; Lyubenova, M.; Munoz, R.; Puzia, T.
    Deep observations of the dwarf elliptical (dE) galaxy NGC 1396 (M-V = -16.60, Mass similar to 4 x 10(8) M-circle dot), located in the Fornax cluster, have been performed with the Very Large Telescope/Multi Unit Spectroscopic Explorer spectrograph in the wavelength region from 4750 to 9350 angstrom. In this paper, we present a stellar population analysis studying chemical abundances, the star formation history (SFH) and the stellar initial mass function (IMF) as a function of galactocentric distance. Different, independent ways to analyse the stellar populations result in a luminosity-weighted age of similar to 6 Gyr and a metallicity [Fe/H]similar to -0.4, similar to other dEs of similar mass. We find unusually overabundant values of [Ca/Fe]similar to+0.1, and underabundant Sodium, with [Na/Fe] values around -0.1, while [Mg/Fe] is overabundant at all radii, increasing from similar to+0.1 in the centre to similar to+0.2 dex. We notice a significant metallicity and age gradient within this dwarf galaxy. To constrain the stellar IMF of NGC 1396, we find that the IMF of NGC 1396 is consistent with either a Kroupa-like or a top-heavy distribution, while a bottom-heavy IMF is firmly ruled out. An analysis of the abundance ratios, and a comparison with galaxies in the Local Group, shows that the chemical enrichment history of NGC 1396 is similar to the Galactic disc, with an extended SFH. This would be the case if the galaxy originated from a Large Magellanic Cloud-sized dwarf galaxy progenitor, which would lose its gas while falling into the Fornax cluster.
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    Latin American Registry of Pediatric Renal Transplantation 2004-2008
    (2010) Goulart, P.; Koch, P.; Medina-Pestana, J.; Garcia, C.; Bittencourt, V.; Medeiros, M.; Munoz, R.; Delucchi, A.; Lillo, A. M.; Ariza, M.; Bosque, M.; Carvalho, D.; Matuck, T.; Meneses, R.; Fontes, J.; Monteiro, D. C.; Neto, E. Davi; Pinto, V.; Salas, P.; Prates, L.; Belanguero, V.; Pereira, L.; Lima, E.; Penido, J. M.; Benini, V.; Laranjo, S.; Silva, J. M.; Orta, N.; Coronel, V.; Cisneros, A.; Arriaga, J.; Sebastian, M. J.; Abbud-Filho, M.; Fernandez, I.; Gastelbondo, R.; Medjia, N.; Rosati, P.; Hevia, P.; Baptista, M. A.; Ramalho, H.; Diaz, M.; Monteverde, M.; Ferraris, J.; Repetto, H.; Exeni, R.; Florentin, L.; Florin, J.; Cazorla, N.; Casadei, D.; Melendez, K.; Calderon, R.; Silva, V.; Patino, J.; Palacio, D.; Madrigal, G.; Sandoval, M.; Urbina, C.; Loza, R.; Cavagnaro, F.; Vogel, A.; Jimenez, W.; Lou, R.; Rodriguez, C.; Aguilar, C.; Galvez, H.; Rodriguez, L.; Paladini, J.; Agusti, J.; Puelma, F.; Troche, A.; Martinez-Pico, M.; Higueras, W.; Liendo, C.; Restrepo, J.; Caicedo, L. A.; Socorro, F.; Semprum, P.
    The Latin American Pediatric Nephrology Association (ALANEPE) reports the first regional kidney transplant registry in Latin America. A mean range of 75%, 30% to 100% renal transplant recipients under 21 yr old were included. Out of 20 countries invited to participate, 14 performed renal transplant, 11 had universal financial support from their governments. The centers included: Brazil (9), Argentina (4), Chile (4), Venezuela (3), Mexico (2), and one in: Cuba, Colombia, Costa Rica, Nicaragua, Guatemala, Ecuador, Honduras, Paraguay and Peru. The registry included 1458 patients, average of 291 per year, 55% male. Mean follow-up 23.4 +/- 17 months; mean age was 11.7 +/- 4.3 yr (1-21), 11% under five yr of age. Etiology: uropathy/ reflux nephropathy 27%, glomerulopathies 24% (included 12% FSGS), hypo/dysplasia (11%), vascular (6%), congenital/hereditary (5%), unknown (19%). Induction therapy: 71% anti-IL2RAb, 13% ATG/TIMO, 14% non-induction. Maintenance therapy: Tacrolimus 64%, Cyclosporine 32%, MMF 54%, MPS 20%, noTORi 96%, steroids 90%, withdrawal or steroid avoidance 10%. Loss of graft 155/1458 (11%), death with functioning graft (3.4%), vascular thrombosis (2.8%), acute rejection (2.8%), recurrence of disease (1%). Forty-eight patients died (3.3%); infection was the main cause 23 (2.1%). Global patient survival rate at one, three, and five yr was 97%, 96%, and 96%. Graft survival rate at one, three, and five yr LRD was 96%, 93% and 89%; for DD 92%, 86% and 76% respectively. Both survival rates were higher in LRD (p < 0.008 and p < 0.001). A pediatric renal transplant study has started, making information available to be shared between the centers and the world.
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    Mapping Milky Way And Local Volume Structure With LSST
    (2011) Geha, Marla C.; Willman, B.; Bochanski, J.; Bullock, J.; Catelan, Márcio; Debattista, V.; Grillmair, C.; Jordan, A.; Juric, M.; Kalirai, J.; Kallivayalil, N.; McGehee, P.; Minniti, D.; Munoz, R.; Roskar, R.; Sarajedini, A.; Simon, J.; Strader, J.
    The LSST will yield revolutionary, multi-dimensional maps of the Milky Way (MW) galaxy and its neighbors. With its planned 1000 epochs over 6 bands and a final limiting magnitude of r=27.5 (AB mag; 5-sigma), it will provide an excellent resource for mapping the structure and accretion history of the MW and beyond in a way that the present generation of surveys can only hint at. LSST is expected to catalog 10 billion stars, including photometric metallicities for the 200 million F/G stars within 100 kpc and map the tangential velocity field of stars bright than r=24 mag to at least 10 kpc (at 10 km/s precision) and as far as 25 kpc (at 60 km/s precision). Specific related science to be enabled by LSST includes: mapping the 3D distribution of dust in the MW's disk, including variations in RV; understanding the smooth distribution of stars in the MW and other nearby galaxies; understanding large-scale chemical gradients in the MW; discovering lumps and streams in metallicity and phase-space; inferring the mass distribution in the MW; discovering ultra-faint galaxies throughout the Local Volume....
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    Network structure in a link formation game: An experimental study
    (2014) Elbittar, A.; Harrison Vergara, Rodrigo José; Munoz, R.
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    Risk factors for severe postoperative complications after gastrectomy for gastric and esophagogastric junction cancers
    (2019) Norero Muñoz, Enrique; Quezada, J.L.; Cerda, Jaime; Ceroni Villanelo, Marco; Martinez, C.; Mejia, R.; Munoz, R.; Araos, F.; Gonzalez, P.; Diaz, A.
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    The Next Generation Virgo Cluster Survey. XXXIV. Ultracompact Dwarf Galaxies in the Virgo Cluster
    (2020) Liu, C. Z.; Cote, P.; Peng, E. W.; Roediger, J.; Zhang, H. X.; Ferrarese, L.; Sánchez Janssen, R.; Guhathakurta, P.; Yang, X. H.; Puzia, Thomas H.; Jing, Y. P.; Alamo Martínez, K.; Blakeslee, J. P.; Boselli, A.; Cuilandre, J. C.; Duc, P. A.; Durrell, P.; Gwyn, S.; Jordán Colzani, Andrés Cristóbal; Ko, Y.; Lancon, A.; Lim, S.; Longobardi, A.; Mei, S.; Mihos, J. C.; Munoz, R.; Powalka, M.; Spengler, C.; Toloba, E.