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2017-09-21 Ionization, feedback and gas metallicity in a radio loud galaxy at z~3 as seen by MUSE
Investigador Invitado Andrew Humphrey
Filiación Institucional Centro de Astrofisica, Universidad de Oporto, Portugal
Resumen: Ver resumen In this talk I will present results from a recent paper using VLT MUSE integral field spectroscopy to study the extended Ly-alpha emitting halo of a powerful, high-redshift radio galaxy at z=2.9. We have investigated the impact of radio-mode feedback, and find possible evidence for positive feedback in this galaxy. We also study its complete far-UV to optical emission line spectrum using VLT's X-SHOOTER, and estimate ~2x solar gas metallicity in the extended narrow line region, at face-value compatible with future evolution into passive spheroidal system, but inconsistent with smooth accretion of pristine gas from the cosmic web.

In addition, I will discuss results from an investigation into the possible causes of 'extreme' (high) Ly-alpha / HeII 1640 flux ratios that have been reported in the gaseous halos of some quasars at z~3, and will also briefly discuss an emission line diagnostic diagram for discriminating between Pop III and AGN activity in high-redshift, low-metallicity galaxies.
Lugar-Hora - 12:00
2017-10-06 Dynamical Mechanisms supporting spirals in disk galaxies
Investigador Invitado Panagiotis Patsis
Filiación Institucional Research Center for Astronomy, Academy of Athens, Greece
Resumen: Ver resumen Spiral arms in galaxies are morphological features that extend mainly
between 1 and 3 exponential disk scale lengths. Usually (but not in
all cases) they are part of barred-spiral structures that determine
the overall morphology of the galaxies. However, in some cases, we
encounter faint spiral arms beyond a distance of 3 disk scale
lengths. I will discuss the possibility that these two spiral
structures have different dynamical origins (i.e. being shaped by
different morphological mechanisms). These mechanisms have to be
compatible with the location of star-forming regions on the disks, or
the absence of them. I will also discuss observational tests that may
clarify in which case one or the other dynamics applies.
Lugar-Hora - 12:00
2017-11-01 Identificación de diferentes regiones de aceleración de partículas asociadas a la evolución de un mismo CME
Investigador Invitado Carolina Salas Matamoros
Filiación Institucional tbd
Resumen: Ver resumen tbd
Lugar-Hora - 12:00

Última modificación :
05-07-2010 a las 14:08 por Webmaster

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