El fotómetro de alta resolución temporal del IAFE

Se describe el estado actual del proyecto y se dan las características finales del sistema.Asociación Argentina de Astronomí

El fotómetro digital multicanal de alta resolución temporal del IAFE

Se detalla el estado actual del proyecto y se informa sobre el plazo estimado para su operatividad, así como las primeras líneas observacionales.Asociación Argentina de Astronomí

SN 1988Z: Spectro-photometric catalogue and energy estimates

We present a spectro-photometric catalogue of the evolution of supernova 1988Z which combines new and published observations in the radio, optical and X-ray bands, with the aim of offering a comprehensive view of the evolution of this object and deriving the total energy radiated since discovery. The major contribution to the total radiated energy comes at optical to X-ray frequencies, with a total emission of at least $2 \times 10^{51}$ erg (for Ho=50 km/s) in 8.5 years. A model-dependent extrapolation of this value indicates that the total radiated energy may be as high as $10^{52}$ erg. The high value of the radiated energy supports a scenario in which most of the kinetic energy of the ejecta is thermalized and radiated in a short interaction with a dense circumstellar medium of nearly constant density. In this sense, 1988Z is not a supernova but a young and compact supernova remnant.Comment: Accepted to be published in MNRAS (14 pages, 10 figures). Also available at http://www.inaoep.mx/~itzia

Evolución de Galaxias y QSOs. Modelo evolutivo-explosivo-compuesto: fase final de galaxias y origen explosivo de galaxias enanas

En este trabajo presentamos nuevos resultados de nuestro modelo evolutivo-explosivo-compuesto de Galaxias, Cuásares y AGNs. En particular: explicamos el concepto de fase final de una galaxia y el hecho de que al menos una fracción de las galaxias enanas pueden ser explicadas con este modelo. También sugerimos que el prototipo de galaxia starburst M82 puede ser una galaxia enana en la fase previa a la final. Además comentamos nuevas observaciones Gemini de BAL+FeII+IR QSOs a medio-alto redshift. Para poder interpretar estos resultados en un contexto más amplio hemos realizado una introducción a nuestro modelo y algunos de los resultados previos más relevantes, entre ellos: (i) Diagrama de Evolución de Galaxias, QSOs, y AGNs; (ii) NuestroModelo Evolutivo-Explosivo-Compuesto explica en un mismo proceso: la interacción de ?Starburst? y los Agujeros Negros supermasivos que generan HiperNovas, el Origen de los Rayos Cósmicos Ultra-Energéticos y la Materia Oscura. (iii) Observación y Teoría de la Formación y de la fase final de Galaxias, via Explosión de HiperNovas en QSOs y AGNs.We present new results of our evolutionary-explosive- composite model of Galaxies, Quasars and AGNs. In particular: we explain the concept of final phase of a galaxy and the fact that at least a fraction of dwarf galaxies can be explained by this model (as a stage prior to the final). In addition, we explain that the prototype of the starburst galaxy M82 could be a dwarf galaxy previous to the final phase. Also, we discuss new Gemini observations BAL + FeII + IR medium-high redshift QSOs. To interpret these results we performed an introduction to our model and some of the most previous relevant results, including: (i) Evolution Diagram of Galaxies, QSOs and AGNs; (ii) Our Evolutionary-Explosive-Compound Model explains in the same process: the interaction of “Starburst” and Supermassive black holes that generate hypernova, the Origin of Ultra Energetic Cosmic Rays and Dark Matter. (iii) Observation and Theory of Formation and Final Phase of Galaxies via hypernova explosions in QSOs and AGNs.Fil: Lipari, Sebastian Luis. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Terlevich, R.J.. University of Cambridge; Reino UnidoFil: Taniguchi, Y.. Eihme University; JapónFil: Mediavilla, E.. Instituto de Astrofísica de Canarias; EspañaFil: Bergmann, M.. Gemini Observatory; ChileFil: García Lorenzo, B.. Instituto de Astrofísica de Canarias; EspañaFil: Sánchez, S.F.. Instituto Nacional de Astrofísica, Óptica y Electrónica; MéxicoFil: Zheng, W.. John Hopkins University; Estados UnidosFil: Punsly, B.. International Center for Relativistic Astrophysics Network; ItaliaFil: Merlo, David Constantino. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentin

The Fueling and Evolution of AGN: Internal and External Triggers

In this chapter, I review the fueling and evolution of active galactic nuclei (AGN) under the influence of internal and external triggers, namely intrinsic properties of host galaxies (morphological or Hubble type, color, presence of bars and other non-axisymmetric features, etc) and external factors such as environment and interactions. The most daunting challenge in fueling AGN is arguably the angular momentum problem as even matter located at a radius of a few hundred pc must lose more than 99.99 % of its specific angular momentum before it is fit for consumption by a BH. I review mass accretion rates, angular momentum requirements, the effectiveness of different fueling mechanisms, and the growth and mass density of black BHs at different epochs. I discuss connections between the nuclear and larger-scale properties of AGN, both locally and at intermediate redshifts, outlining some recent results from the GEMS and GOODS HST surveys.Comment: Invited Review Chapter to appear in LNP Volume on "AGN Physics on All Scales", Chapter 6, in press. 40 pages, 12 figures. Typo in Eq 5 correcte

How to move ionized gas: an introduction to the dynamics of HII regions

This review covers the dynamic processes that are important in the evolution and structure of galactic HII regions, concentrating on an elementary presentation of the physical concepts and recent numerical simulations of HII region evolution in a non-uniform medium. The contents are as follows: (1) The equations (Euler equations; Radiative transfer; Rate equations; How to avoid the dynamics; How to avoid the atomic physics). (2) Physical concepts (Static photoionization equilibrium; Ionization front propagation; Structure of a D-type front; Photoablation flows; Other ingredients - Stellar winds, Radiation pressure, Magnetic fields, Instabilities). (3) HII region evolution (Early phases: hypercompact and ultracompact regions; Later phases: compact and extended regions; Clumps and turbulence).Comment: To be published as a chapter in 'Diffuse Matter from Star Forming Regions to Active Galaxies' - A volume Honouring John Dyson. Eds. T. W. Harquist, J. M. Pittard and S. A. E. G. Falle. 25 pages, 7 figures. Some figures degraded to meet size restriction. Full-resolution version available at http://www.ifront.org/wiki/Dyson_Festschrift_Chapte

Classification of Supernovae

The current classification scheme for supernovae is presented. The main observational features of the supernova types are described and the physical implications briefly addressed. Differences between the homogeneous thermonuclear type Ia and similarities among the heterogeneous core collapse type Ib, Ic and II are highlighted. Transforming type IIb, narrow line type IIn, supernovae associated with GRBs and few peculiar objects are also discussed.Comment: 16 Pages, 4 figures, to be published in "Supernovae and Gamma-Ray Bursters," ed. Kurt W. Weile

The Physics of Star Cluster Formation and Evolution

© 2020 Springer-Verlag. The final publication is available at Springer via https://doi.org/10.1007/s11214-020-00689-4.Star clusters form in dense, hierarchically collapsing gas clouds. Bulk kinetic energy is transformed to turbulence with stars forming from cores fed by filaments. In the most compact regions, stellar feedback is least effective in removing the gas and stars may form very efficiently. These are also the regions where, in high-mass clusters, ejecta from some kind of high-mass stars are effectively captured during the formation phase of some of the low mass stars and effectively channeled into the latter to form multiple populations. Star formation epochs in star clusters are generally set by gas flows that determine the abundance of gas in the cluster. We argue that there is likely only one star formation epoch after which clusters remain essentially clear of gas by cluster winds. Collisional dynamics is important in this phase leading to core collapse, expansion and eventual dispersion of every cluster. We review recent developments in the field with a focus on theoretical work.Peer reviewe

High resolution H I observations of NGC 1068.

Surprisingly few Seyfert galaxies have been mapped at near optical resolution in the 21-cm line of neutral atomic hydrogen, despite the fact that studies of the gaseous component hold out the possibility of identifying the cause of infall of gas to or outflow from the central region. We therefore decided to observe the Seyfert 2 galaxy NGC 1068 with the NRAO - Very Large Array. The spatial resolution of the final images is about 8" or 700 parsec at a distance of 18 Mpc; the velocity resolution is 5.2 km s-¹

Métodos fotométricos

Se analizan brevemente las ventajas y desventajas de los siguientes métodos de medición: corriente continua, recuento de fotones y shot-noise. Se toma como parámetro de comparación la relación señal-ruido. Se analizan las limitaciones de este parámetro en relación con flujos fuertes y débiles.Asociación Argentina de Astronomí