High Angular Resolution Observations of the Collimated Jet Source Associated with a Massive Protostar in IRAS 16547-4247

A triple radio source recently detected in association with the luminous infrared source IRAS 16547-4247 has been studied with high angular resolution and high sensitivity with the Very Large Array at 3.6 and 2 cm. Our observations confirm the interpretation that the central object is a thermal radio jet, while the two outer lobes are most probably heavily obscured HH objects. The thermal radio jet is resolved angularly for the first time and found to align closely with the outer lobes. The opening angle of the thermal jet is estimated to be $\sim 25^\circ$, confirming that collimated outflows can also be present in massive protostars. The proper motions of the outer lobes should be measurable over timescales of a few years. Several fainter sources detected in the region are most probably associated with other stars in a young cluster.Comment: 9 pages, 2 figure

Reproductive capacity of the red cusk-eel genypterus chilensis (Guichenot, 1848) in captivity

Indexación: Scopus.This work was supported by the FONDEF Project D06I 1024 “Development of technologies for the production of red cusk-eel fingerlings (Genypterus chilensis)”.Genypterus chilensis is a marine fish of high gastronomic demand, whose capture has declined in recent years due to overfishing. In the development of the farming technology, high mortalities were obtained during egg incubation. The objective of this study is to contribute to the knowledge of fecundity and eggs viability of G. chilensis in captivity. The spawns of G. chilensis were analyzed over a period of 2 years and 3 months. The total fecundity was estimated by counting the masses and eggs produced monthly throughout the period. The results confirm that G. chilensis is a partial spawner, since a female may more than two masses of eggs per day, due to a large amount of mass spawned per season (621 average). The total production of masses of the Farming Centre during the period was 2,290; of these, only 7% (166) corresponding to 15,330,517 eggs were incubated. Because of its high fecundity, G. chilensis produces numerous masses of eggs, of which only a small percentage reaches incubation, as well as it occurs in other marine fish. © 2018, Escuela de Ciencias del Mar. All rights reserved.https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0718-560X201800020048

PESQUISAS QUALITATIVAS E EDUCAÇÃO.TENSÕES EM SUA PROPOSTA, DESENVOLVIMENTO, ESCRITA E PUBLICAÇÃO

This paper explores the tensions in qualitative research and education. With this objective, it offers a brief introduction to qualitative research in education, a vision of the historical link of these two fields of study, to lead to a reflection between the thematic and the methodological when we talk about qualitative methodologies in education. Under that approach, the text focuses on the tensions that appear in the formulation of a proposal, development, writing and publication of a qualitative research in education. The tensions in the proposal are concentrated in the formats of formulation and presentation of research projects when we construct the object of study from a qualitative perspective. In the development of the research, time appears as a central concern from various points of view, as well as the tension between the order of analysis and the order of presentation. The writing is approached from the tension between the option for an argumentative text and a narrative text. Finally, the tensions in the publication focus on sending manuscripts to thematic journals or journals specialized in methodology. The tensions in each of these moments of qualitative research in education are explored from the point of view of their possibilities.El presente trabajo explora las tensiones en investigación cualitativa y educación.  Con ese objetivo, el texto parte ofreciendo una breve introducción a la investigación cualitativa en educación, una visión del vínculo histórico de estos dos campos de estudio, para desembocar en una reflexión entre lo temático y lo metodológico cuando hablamos de investigación cualitativa en/y educación. Sobre esta base, el escrito pasa a centrarse en las tensiones que aparecen en la formulación de una propuesta, desarrollo, escritura y publicación de una investigación cualitativa en educación. Las tensiones en la propuesta se concentran en los formatos de formulación y presentación de proyectos de investigación cuando construimos el objeto de estudio desde la perspectiva cualitativa. En el desarrollo de la investigación, el tiempo aparece como una preocupación central desde diversos puntos de vista, así como la tensión entre el orden del análisis y el orden de la presentación. La escritura es abordada desde la tensión entre la opción por un texto argumentativo y un texto narrativo. Por último, las tensiones en la  publicación se centran en el envío de manuscritos a revistas temáticas o revistas especializadas en metodología. Las tensiones en cada uno de estos momentos de la investigación cualitativa en educación son exploradas desde el punto de vista de las posibilidades.O presente trabalho explora as tensões em introdução qualitativa e educação. O objetivo desse trabalho é oferecer uma breve introdução sobre a introdução qualitativa em educação, uma visão do vinculo histórico destes, dos campos de estudos, para levar á uma reflexão entre o tematico e o metodologico quando falamos de metodología qualitativa na educação. Com este contexto o manuscrito passa a centrar-se nas tensões que aparecem na formulação de uma proposta, desenvolvimento, escrita e publicacao de uma introdução qualitativa na educa- ção. As tensões da proposta se concentram nos formatos de formulação e apresentação de projetos de introdução quando construimos o objeto de estudo desde a perspectiva qualitativa. No desenvolvimento da pesquisa, o tempo aparece como uma preocupação central á partir de diversos pontos de vista, assim como a tensao entre a orden das analises e a ordem da apresentação. A escrita é abordada desde a tensão entre a op- ção por um texto argumentativo ou um texto narrativo. Por fim, as tensões quanto a publicação se concentram no envio de manuscritos para as revistas temáticas ou revistas especializadas em metodologia. As tensões em cada um destes momentos da introdução qualitativa em educação são exploradas a partir dos pontos de vistas das posibilidades

Dichotomy in the Dynamical Status of Massive Cores in Orion

To study the evolution of high mass cores, we have searched for evidence of collapse motions in a large sample of starless cores in the Orion molecular cloud. We used the Caltech Submillimeter Observatory telescope to obtain spectra of the optically thin (\H13CO+) and optically thick (\HCO+) high density tracer molecules in 27 cores with masses $>$ 1 \Ms. The red- and blue-asymmetries seen in the line profiles of the optically thick line with respect to the optically thin line indicate that 2/3 of these cores are not static. We detect evidence for infall (inward motions) in 9 cores and outward motions for 10 cores, suggesting a dichotomy in the kinematic state of the non-static cores in this sample. Our results provide an important observational constraint on the fraction of collapsing (inward motions) versus non-collapsing (re-expanding) cores for comparison with model simulations.Comment: 9 pages, 2 Figures. To appear in ApJ(Letters

Mid- and high-J CO observations towards UCHIIs

A study of 12 ultracompact HII regions was conducted to probe the physical conditions and kinematics in the inner envelopes of the molecular clumps harboring them. The APEX telescope was used to observe the sources in the CO (4-3) and 13CO (8-7) lines. Line intensities were modeled with the RATRAN radiative transfer code using power laws for the density and temperature to describe the physical structure of the clumps. All sources were detected in both lines. The optically thick CO (4-3) line shows predominantly blue skewed profiles reminiscent of infall. Line intensities can be reproduced well using the physical structure of the clumps taken from the literature. The optically thick line profiles show that CO is a sensitive tracer of ongoing infall in the outer envelopes of clumps harboring ultracompact HII regions and hot molecular cores.Comment: APEX A&A special issue, accepte

Las orquídeas de la Reserva de la Biosfera Torres del Paine: La necesidad de implementar monitoreo de especies y planificación ecoturística para la conservación de la biodiversidad

The orchid flora of Torres del Paine Biosphere Reserve (TPBR) is described based on botanical surveys, photographicalrecords and herbarium collections carried out by the authors. This list comprises 3 genera and 9 species: Chloraea chica,Chloraea leptopetala, Chloraea magellanica, Codonorchis lessonii, Gavilea araucana, Gavilea gladysiae, Gavilealittoralis, Gavilea lutea and Gavilea supralabellata. G. gladysiae is a new record for this protected area and the firstalbino aberrant phenotype for flowers of Chl. magellanica is reported. A description of the species including key fordetermination, morphology, habitats, local abundances, flowering phenology and photographs is provided. The speciesrichness here reported represents ca. 35% of orchids occurring in the Chilean temperate-austral floristic regions and 75%of the species described for the Magallanes Region, putting the Torres del Paine Biosphere Reserve as one of the mostrepresentative protected areas for this taxonomical group in the region. Based on our results we addressed the need ofestablishing monitoring programs for orchids and promote them as flagship species in ecotourism planning in order toenhance species valuation and encourage biodiversity conservation.  Se describen las orquídeas de la Reserva de la Biosfera Torres del Paine sobre la base de exploraciones botánicas, registrosfotográficos y colecciones de herbario llevadas a cabo por los autores. Esta lista comprende 3 géneros y 9 especies: Chloraeachica, Chloraea leptopetala, Chloraea magellanica, Codonorchis lessonii, Gavilea araucana, Gavilea gladysiae, Gavilealittoralis, Gavilea lutea y Gavilea supralabellata. G. gladysiae es un registro nuevo para esta área protegida y se reporta elprimer fenotipo aberrante de flores albinas de Chl. magellanica. Se provee de una descripción de las especies que incluyemorfología, habitats, abundancias locales, fenología de floración y fotografías. La riqueza de especies aquí reportadarepresenta cerca del 35% de las orquídeas que se distribuyen en las regiones florísticas Templada-Austral y el 75% de lasespecies descritas para la Región de Magallanes, colocando a la Reserva de la Biosfera Torres del Paine como una de lasáreas protegidas más representativas para este grupo taxonómico en Chile. Basados en nuestros resultados recalcamosla necesidad de establecer programas de monitoreo para las orquídeas y promoverlas como especies emblemáticas enplanificación ecoturística para así incrementar la valoración de las especies y reforzar la conservación de la biodiversidad

A Multiwavelength Study of Young Massive Star-Forming Regions. III. Mid-Infrared Emission

We present mid-infrared (MIR) observations, made with the TIMMI2 camera on the ESO 3.6 m telescope, toward 14 young massive star-forming regions. All regions were imaged in the N band, and nine in the Q band, with an angular resolution of ~ 1 arcsec. Typically, the regions exhibit a single or two compact sources (with sizes in the range 0.008-0.18 pc) plus extended diffuse emission. The Spitzer-Galactic Legacy Infrared Mid-Plane Survey Extraordinaire images of these regions show much more extended emission than that seen by TIMMI2, and this is attributed to polycyclic aromatic hydrocarbon (PAH) bands. For the MIR sources associated with radio continuum radiation (Paper I) there is a close morphological correspondence between the two emissions, suggesting that the ionized gas (radio source) and hot dust (MIR source) coexist inside the H II region. We found five MIR compact sources which are not associated with radio continuum emission, and are thus prime candidates for hosting young massive protostars. In particular, objects IRAS 14593-5852 II (only detected at 17.7 microns) and 17008-4040 I are likely to be genuine O-type protostellar objects. We also present TIMMI2 N-band spectra of eight sources, all of which are dominated by a prominent silicate absorption feature (~ 9.7 microns). From these data we estimate column densities in the range (7-17)x10^22 cm^-2, in good agreement with those derived from the 1.2 mm data (Paper II). Seven sources show bright [Ne II] line emission, as expected from ionized gas regions. Only IRAS 123830-6128 shows detectable PAH emission at 8.6 and 11.3 microns.Comment: Published in ApJ. 15 pages, 6 figures. Formatted with emulateapj; v2: Minor language changes to match the published versio

AMBER on the VLTI: data processing and calibration issues

We present here the current performances of the AMBER / VLTI instrument for standard use and compare these with the offered modes of the instrument. We show that the instrument is able to reach its specified precision only for medium and high spectral resolution modes, differential observables and bright objects. For absolute observables, the current achievable accuracy is strongly limited by the vibrations of the Unit Telescopes, and also by the observing procedure which does not take into account the night-long transfer function monitoring. For low-resolution mode, the current limitation is more in the data reduction side, since several effects negligible at medium spectral resolution are not taken into account in the current pipeline. Finally, for faint objects (SNR around 1 per spectral channel), electromagnetic interferences in the VLTI interferometric laboratory with the detector electronics prevents currently to get unbiased measurements. Ideas are under study to correct in the data processing side this effect, but a hardware fix should be investigated seriously since it limits seriously the effective limiting magnitude of the instrument.Comment: 10 page

The open cluster NGC 6520 and the nearby dark molecular cloud Barnard 86

Wide field BVI photometry and $^{12}$CO(1$\to$0) observations are presen ted in the region of the open cluster NGC 6520 and the dark molecular cloud Barnard~86. From the analysis of the optical data we find that the cluster is rather compact, with a radius of 1.0$\pm$0.5 arcmin, smaller than previous estimates. The cluster age is 150$\pm$50 Myr and the reddening E$_{B-V}$=0.42$\pm$0.10. The distance from the Sun is estimated to be 1900$\pm$100 pc, and it is larger than previous estimates. We finally derive basic properties of the dark nebula Barnard 86 on the assumption that it lies at the same distance of the cluster.Comment: 21 pages, 8 eps figures (a few degraded in resolution), accepted for publication in the Astronomical Journa