15 de Noviembre 2018 16 hs
Astrobiologia: la vida como un fenómeno planetario
Dra. Ximena Abrevaya
Inv. Adjunta – CONICET, Argentina
La astrobiología es un área relativamente nueva de la ciencia cuyo objetivo es investigar el origen, evolución y distribución de la vida en el universo y plantea una serie de interrogantes y desafíos. ¿Qué es la vida?, ¿Cómo se originó la vida?, ¿Es posible encontrar vida en otros cuerpos planetarios?, ¿Cómo buscamos vida en otros planetas?, ¿Cómo evaluamos las chances de que otro cuerpo planetario esté habitado?. En esta charla brindaré una breve introducción al tema en base a estas preguntas y comentaré cómo nuestro grupo de trabajo, el Núcleo Argentino de Investigación en Astrobiología, conecta áreas de la ciencia distantes como la astrofísica, la microbiología y la geología planetaria, para llevar adelante líneas de investigación interdisciplinaria, que intentan responder algunos de los interrogantes que esta ciencia emergente plantea.
16 de Noviembre 2018 12 hs
Justus Neumann
A comparative analysis of the structural properties of star-forming and non-star-forming galaxy bars
Abstract:
In the work that I present in this talk we use integral-field spectroscopic data from the Multi-Unit Spectroscopic Explorer (MUSE) to investigate how star formation within bars is connected to structural properties of the bar and the host galaxy. The absence of star formation in the bar region that has been reported for some but not all galaxies can theoretically be explained by shear. However, it is not clear how star-forming bars fit into this picture and how the dynamical state of the bar is related to other properties of the host galaxy. We use spatially resolved Hα flux from MUSE observations from the Close AGN Reference Survey (CARS) to estimate star formation rates in the bars of 16 nearby (0.01 < z < 0.06) disc galaxies. We further use the instrument’s imaging capabilities to perform a detailed multi-component photometric decomposition. In this talk, I will present the results obtained from comparing the star formation in the bar with structural properties. Furthermore, I will show the detailed 2D distribution of star formation in the bar and the results of testing an AGN feeding scenario.
16 de Noviembre 2018 15 hs
Miller Gross 1
A talk about Ruby Payne-Scott
Under the Radar, the First Woman in Radio Astronomy, Ruby Payne-Scott
- Miller Goss,NRAO Socorro NM
Ruby Payne-Scott (1912-1981) was an eminent Australian scientist who made major contributions to the WWII radar effort (CSIR) from 1941 to 1945. In late 1945, shepioneered radio astronomy efforts at Dover Heights in Sydney, Australia at a beautiful cliff top overlooking the Tasman Sea. Again at Dover Heights, Payne-Scott carried outthe first interferometry in radio astronomy using an Australian Army radar antenna as a radio telescope at sun-rise, 26 January 1946. She continued these ground breaking activities until 1951.
Ruby Payne-Scott played a major role in discovering and elucidating the properties of Type III bursts from the sun, the most common of the five classes of transientphenomena from the solar corona. These bursts are one of the most intensively studied forms of radio emission in all of astronomy. She is also one of the inventors of aperturesynthesis in radio astronomy.
I examine her career at the University of Sydney and her conflicts with the CSIR hierarchy concerning the rights of women in the work place, specifically equal wages and thelack of permanent status for married women. I also explore her membership in the Communist Party of Australia as well as her partially released Australian ScientificIntelligence Organization file.
Payne-Scott’s role as a major participant in the flourishing radio astronomy research of the post war era remains a remarkable story. She had a number of strong collaborationswith the pioneers of early radio astronomy in Australia: Pawsey, Mills, Christiansen, Bolton and Little. I have written two books about Ruby Payne-Scott. The popular version was published in July 2013: “Making Waves, The Story of Ruby Payne-Scott: Australian Pioneer Radio Astronomer” – Springer in the Astronomers’ Universe Series.
In August 2018, Payne-Scott received an OVERLOOKED obituary in the New York Times.