Examinando por Autor "Mendes de Oliveira, Claudia L."

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Formation of S0s in extreme environments I: clues from kinematics and stellar populations
(Oxford Academics: Blackwell Publishing, 2020-02-01) Coccato, L.; Jaffé, Y. L.; Cortesi, A.; Merrifield, M.; Johnston, E. J.; Rodríguez del Pino, B.; Haeussler, B.; Chies Santos, A. L.; Mendes de Oliveira, Claudia L.; Sheen, Y. K.; Menéndez Delmestre, K.; Ministerio de Economía y Competitividad (MINECO); Comisión Nacional de Investigación Científica y Tecnológica (CONICYT); Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT); National Research Foundation of Korea (NRF); Agencia Estatal de Investigación (AEI); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Rio Grande do Sul Research Foundation (FAPERGS); Jaffé, Y. L. [0000-0003-2150-1130]; Cortesi, A. [0000-0002-0620-136X]; Chies Santos, A. [0000-0003-3220-0165]; Mendes de Oliveira, C. [0000-0002-5267-9065]; Johnston, E. [0000-0002-2368-6469]; Merrifield, M. [0000-0002-4202-4727]; Rodríguez del Pino, B. [0000-0001-5171-3930]; Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
Despite numerous efforts, it is still unclear whether lenticular galaxies (S0s) evolve from spirals whose star formation was suppressed, or formed trough mergers or disc instabilities. In this paper we present a pilot study of 21 S0 galaxies in extreme environments (field and cluster), and compare their spatially resolved kinematics and global stellar populations. Our aim is to identify whether there are different mechanisms that form S0s in different environments. Our results show that the kinematics of S0 galaxies in field and cluster are, indeed, different. Lenticulars in the cluster are more rotationally supported, suggesting that they are formed through processes that involve the rapid consumption or removal of gas (e.g. starvation, ram pressure stripping). In contrast, S0s in the field are more pressure supported, suggesting that minor mergers served mostly to shape their kinematic properties. These results are independent of total mass, luminosity, or disc-to-bulge ratio. On the other hand, the mass-weighted age, metallicity, and star formation time-scale of the galaxies correlate more with mass than with environment, in agreement with known relations from previous work, such as the one between mass and metallicity. Overall, our results re-enforce the idea that there are multiple mechanisms that produce S0s, and that both mass and environment play key roles. A larger sample is highly desirable to confirm or refute the results and the interpretation of this pilot study.
Acceso Abierto
J-PLUS: Tools to identify compact planetary nebulae in the Javalambre and southern photometric local Universe surveys
(EDP Sciences, 2020-01-21) Gutiérrez Soto, L. A.; Gonçalves, D. R.; Akras, S.; Cortesi, A.; López Sanjuan, C.; Guerrero, Martín A.; Daflon, S.; Borges Fernandes, M.; Mendes de Oliveira, Claudia L.; Ederoclite, A.; Sodré, L.; Pereira, C. B.; Kanaan, A.; Werle, A.; Vázquez Ramió, H.; Alcaniz, J. S.; Angulo, R. E.; Cenarro, A. J.; Cristóbal Hornillos, D.; Dupke, R. A.; Hernández Monteagudo, C.; Marín Franch, A.; Moles, M.; Varela, J.; Ribeiro, T.; Schoenell, W.; Álvarez Candal, A.; Galbany, L.; Jiménez Esteban, F. M.; Logroño García, R.; Sobral, D.; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); European Research Council (ERC); Ministerio de Economía y Competitividad (MINECO); Guitiérrez Soto, L. A. [0000-0002-9891-8017]
Context. From the approximately 3500 planetary nebulae (PNe) discovered in our Galaxy, only 14 are known to be members of the Galactic halo. Nevertheless, a systematic search for halo PNe has never been performed. Aims. In this study, we present new photometric diagnostic tools to identify compact PNe in the Galactic halo by making use of the novel 12-filter system projects, Javalambre Photometric Local Universe Survey (J-PLUS) and Southern-Photometric Local Universe Survey (S-PLUS). Methods. We reconstructed the Isaac Newton Telescope Photometric H alpha Survey of the Northern Galactic Plane diagnostic diagram and propose four new ones using (i) the J-PLUS and S-PLUS synthetic photometry for a grid of photo-ionisation models of halo PNe, (ii) several observed halo PNe, as well as (iii) a number of other emission-line objects that resemble PNe. All colour-colour diagnostic diagrams are validated using two known halo PNe observed by J-PLUS during the scientific verification phase and the first data release (DR1) of S-PLUS and the DR1 of J-PLUS. Results. By applying our criteria to the DR1s (similar to 1190 deg(2)), we identified one PN candidate. However, optical follow-up spectroscopy proved it to be a HII region belonging to the UGC 5272 galaxy. Here, we also discuss the PN and two HII galaxies recovered by these selection criteria. Finally, the cross-matching with the most updated PNe catalogue (HASH) helped us to highlight the potential of these surveys, since we recover all the known PNe in the observed area. Conclusions. The tools here proposed to identify PNe and separate them from their emission-line contaminants proved to be very efficient thanks to the combination of many colours, even when applied - like in the present work - to an automatic photometric search that is limited to compact PNe.