Properties of Very Luminous Galaxies

Recent analysis of the SSRS2 data based on cell-counts and two-point correlation function has shown that very luminous galaxies are much more strongly clustered than fainter galaxies. In fact, the amplitude of the correlation function of very luminous galaxies ($L > L^*$) asymptotically approaches that of $R \ge 0$ clusters. In this paper we investigate the properties of the most luminous galaxies, with blue absolute magnitude $M_B \le -21$. We find that: 1) the population mix is comparable to that in other ranges of absolute magnitudes; 2) only a small fraction are located in bona fide clusters; 3) the bright galaxy-cluster cross-correlation function is significantly higher on large scales than that measured for fainter galaxies; 4) the correlation length of galaxies brighter than \MB $\sim -20.0$, expressed as a function of the mean interparticle distance, appears to follow the universal dimensionless correlation function found for clusters and radio galaxies; 5) a large fraction of the bright galaxies are in interacting pairs, others show evidence for tidal distortions, while some appear to be surrounded by faint satellite galaxies. We conclude that very luminous optical galaxies differ from the normal population of galaxies both in the clustering and other respects. We speculate that this population is highly biased tracers of mass, being associated to dark halos with masses more comparable to clusters than typical loose groups.Comment: 29 pages (6 figures) + 2 tables; paper with all figures and images available at http://boas5.bo.astro.it/~cappi/papers.html; The Astronomical Journal, in pres

Fruticultura tropical: o biribazeiro Rollinia mucosa (Jacq.) Baill.

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Bifurcation analysis of the twist-Freedericksz transition in a nematic liquid-crystal cell with pre-twist boundary conditions

Motivated by a recent investigation of Millar and McKay [Mol. Cryst. Liq. Cryst., 435, 277/[937]-286/[946] (2005)], we study the magnetic field twist-Fr´eedericksz transition for a nematic liquid crystal of positive diamagnetic anisotropy with strong anchoring and pre- twist boundary conditions. Despite the pre-twist, the system still possesses Z2 symmetry and a symmetry-breaking pitchfork bifurcation, which occurs at a critical magnetic-field strength that, as we prove, is above the threshold for the classical twist-Fr´eedericksz tran- sition (which has no pre-twist). It was observed numerically by Millar and McKay that this instability occurs precisely at the point at which the ground-state solution loses its monotonicity (with respect to the position coordinate across the cell gap). We explain this surprising observation using a rigorous phase-space analysis

'Gloriosa': crisphead tropicalized cultivar

'Gloriosa' é uma cultivar de alface (Lactuca sativa L.) americana tropicalizada e resistente a Thielaviopsis basicola. Foi selecionada a partir de variantes da cultivar Lucy Brown, pelo método genealógico. Progênies S1 a S6 foram selecionadas para resistência a T. basicola, características hortícolas, tolerância ao pendoamento precoce e adaptação ao cultivo de verão. Apresenta ciclo precoce de 40 a 50 dias pós-transplante, pendoamento lento, cabeças grandes e três camadas de folhas externas. Possui tolerância a Xanthomonas campestris pv. vitians e suporta o cultivo nos períodos de elevadas temperaturas e pluviosidade. Trata-se da primeira cultivar de alface americana tropicalizada no Brasil.'Gloriosa' is a tropicalized crisphead lettuce (Lactuca sativa L.) resistant to Thielaviopsis basicola. It was derived by selection from cv. Lucy Brown variants by pedigree method. Progenies S1 to S6 were selected for T. basicola resistance, desirable horticulture traits, slowbolting and adaptation for Brazilian summer crop. It presents a precocious cycle within 40 to 50 days of being planted, slowbolting, large head and three layers of frame levels. It is tolerant to Xanthomonas campestris pv. vitians and is able to be grown under high temperature and rainy summer in southern of Brazil. It is the first crisphead lettuce type developed for tropical regions of Brazil

Finding RR Lyrae Stars with SkyMapper: an Observational Test

One of the major science goals of the SkyMapper Survey of the Southern Hemisphere sky is the determination of the shape and extent of the halo of the Galaxy. In this paper we quantify the likely efficiency and completeness of the survey as regards the detection of RR Lyrae variable stars, which are excellent tracers of the halo stellar population. We have accomplished this via observations of the RR Lyrae-rich globular cluster NGC 3201. We find that for single epoch uvgri observations followed by two further epochs of g, r imaging, as per the intended three-epoch survey strategy, we recover known RR Lyraes with a completeness exceeding 90%. We also investigate boundaries in the gravity-sensitive single-epoch two-color diagram that yield high completeness and high efficiency (i.e., minimal contamination by non-RR Lyraes) and the general usefulness of this diagram in separating populations.Comment: 10 pages, 5 figures, to appear in the Publications of the Astronomical Society of Australia (PASA), published by Cambridge University Pres

Delineamento e parametrização ambiental de microbacias hidrográficas para o Estado do Rio de Janeiro.

Bacias hidrográficas são unidades de gestão e planejamento ambiental para monitoramento hidrológico, conservação do solo e disciplinamento do uso da terra, devido à importância na produção de água em qualidade e quantidade. A Política Nacional dos Recursos Hídricos (Lei 9433 de 1997, Decreto 2612 de 1998) tem como finalidade organizar a gestão de BH entre usuários de água, envolvendo setores produtivos e da sociedade civil, em diferentes esferas administrativas, o que exige uma subdivisão do território em Grandes Bacias, Sub-bacias e Microbacias hidrográficas. Para o Estado do Rio de Janeiro existem delineamentos de BH em regiões específicas, resultantes do programa de despoluição da Baía de Guanabara (PDBG) e do projeto GEROE. Para uma subdivisão em maior escala e para todo o Estado do Rio, foi executada uma delimitação automática com edição de sub-bacias hidrográficas, sendo estas bacias posteriormente parametrizadas com a finalidade de indicar o grau de vulnerabilidade por meio de uma análise multicritério. O resultado indica que as bacias mais vulneráveis concentram-se na região noroeste e norte do Estado, sendo que as que apresentaram maior grau de vulnerabilidade acompanham o Rio Paraíba do Sul da região central do Estado até sua foz, sendo considerada, portanto, uma indicação de áreas para programas de recuperação ambiental

The Power Spectrum of Galaxies in the Nearby Universe

We compute the power spectrum of galaxy density fluctuations in a recently completed redshift survey of optically-selected galaxies in the southern hemisphere (SSRS2). The amplitude and shape of the SSRS2 power spectrum are consistent with results of the Center for Astrophysics redshift survey of the northern hemisphere (CfA2), including the abrupt change of slope on a scale of 30-50Mpc/h; these results are reproducible for independent volumes of space and variations are consistent with the errors estimated from mock surveys. Taken together, the SSRS2 and CfA2 form a complete sample of 14,383 galaxies which covers one-third of the sky. The power spectrum of this larger sample continues to rise on scales up to ~ 200Mpc/h, with weak evidence for flattening on the largest scales. The SSRS2+CfA2 power spectrum and the power spectrum constraints implied by COBE are well-matched by an Omega*h ~ 0.2, Omega+lambda_0=1 CDM model with minimal biasing of optically-selected galaxies.Comment: Accepted for publication in The Astrophysical Journal Letters, Sept. 23, 1994. 10 pages uuencoded compressed postscript, including two figures. JHU-9410200

Registro de introduções de plantas de cultura pré-colombiana coletadas na Amazônia brasileira.

Registro de introduções do material coletado nas viagens realizadas de 1984 a 1988. Principais características das plantas matrizes: timbó, dao, acai, tucuma, cupuaçu, biriba, condessa, graviola, araticum, palmeiras do gênero oenocarpus, pupunha, urucu, taperebá, cutite, cajarana, cacau, plantas medicinais, boldo.bitstream/item/63464/1/CPATU-Doc58.pd