Galván Madrid, R.
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The far-infrared to radio view of star formation in clusters
Radio, (sub)mm and infrared observations are key to our current understanding of the formation of massive stars in clusters, but often the interpretation is limited by the complexity of observations.
First, I will present recent projects aiming at measuring the population of star-forming cores and young massive stars in cluster forming clouds, mainly the ALMA-IMF Large Program and a complementary project in the W49 cloud. I will highlight some of the first scientific results of these programs, and describe the public data releases of ALMA-IMF. For the interpretation of the continuum images, the separation of dust and free-free emission is very important, so I will also discuss a few methods to achieve this.
Then I will switch to describe other projects consisting in modelling the dust and free-free continuum, as well as the kinematics in radio recombination and molecular lines of massive (proto)stars in clustered environments.
Finally, I will outline our initial efforts to contribute to the science case of the Next Generation Very Large Array, which ideally should have a few antennas across Mexico.
Navarro, J.
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Dark Matter Clues from the Faintest Galaxies
I will briefly present results on two recent discoveries which represent the faintest galaxies known to date. One is a dwarf satellite of the Milky Way with only ~16 Msun of stars, and another one a gas-filled system apparently devoid of stars. I will discuss some of the implications of these galaxies for the nature of dark matter.
Esquivel, A.
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Polarized Emission from Supernovae Remnants
We present numerical simulations of Supernovae Remnants including an estimate of the acceleration of particles in the main shock by coupling the MHD code GUAHCO and "Lagrangian Macro Particles". This particles represent a non-thermal distribution component with an energy distribution that is affected by the MHD fluid. The Lagrangian Macro-Particles allows us to estimate the Stokes parameters, yielding synthetic polarimetric observations that are compared with observations.
Wang, L.
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The Cosmic Dust Storms in SNIa-CSM 2018evt
We report evidence of dust formation in the cold, dense shell behind the ejecta-circumstellar medium (CSM) interaction in the Type Ia (SNIa) SN2018evt three years after the explosion, characterized by a rise in the mid-infrared (MIR) flux accompanied by an accelerated decline in the optical. Such a dust-formation picture is also corroborated by the concurrent evolution of the profiles of the Ha emission lines. Our models suggest enhanced dust concentration at increasing distances from the SN as compared to what can be expected from the density profile of the mass loss from a steady stellar wind. This may indicate an enhanced dust presence at larger distances from the progenitor star. The CSM dust distribution can be modeled in terms of a double-shell which assumes a sudden change of the density profile of the dust or a single-shell model with a flatter radial profile. The grand rebrightening in the MIR after day +310 is attributed to the formation of new dust within the CDS region behind the forward shock. The mass of the newly-formed dust increases rapidly with time and follows a power law with an index of 4. By the time of the last MIR observations at day +1041, a total amount of 0.01 Msun of dust has been produced, making SN 2018evt one of the most prolific dust factory among SNe with evidence of dust formations.
Segura, M.
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China Argentina Radio Telescope current status
CART is intended to work at the beginning with bands S/X for geodetic studies, but in the future, Ka band will be evaluated to improve the measurements accuracy from cm level to mm level. This work will present the last updates on CART status, detail the future activities that will be carried out during this year.