[Graduados] Seminarios FCAG del 11 al 14/12

Jue Dic 7 14:31:32 -03 2023

A toda la comunidad,

los invitamos a asistir a las cinco (5) charlas que se brindarán en el 
transcurso de la semana que viene en el marco de los Seminarios FCAG, en 
el Salón Meridiano. A continuación les enviamos los detalles de cada 
charla y los datos de conexión para aquellas personas que no puedan 
acercarse al Salón Meridiano.
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*-LUNES 11 - 14h: Seminario "A black hole's gotta eat too: accretion on 
low-luminosity AGN"*. La misma estará a cargo del *Lic. Iván López* 
(Universidad de Bologna).

*Resumen:* Spectral Energy Distribution (SED) fitting is a popular 
technique to derive properties of galaxies, such as stellar masses and 
Star Formation Rate (SFR), and from their active nuclei, such as 
bolometric Luminosities produced by the central black hole’s accretion. 
We used the code Cigale on an X-ray-selected sample of active galaxies 
until z<2.5 with data from X-ray to mid-IR and obtained reliable values 
of the accretion luminosity. We compared these properties to understand 
how they affect the host galaxy’s global properties in the co-evolution 
scenario. Now, we are applying a similar methodology with a nearby 
sample of galaxies (<50Mpc, based on the Palomar sample), extending the 
multiwavelength data to far-IR and radio. In this sample, we can focus 
our SED fitting in the inner part of the galaxy, obtaining better 
constraints on their accretion luminosities, torus properties, and 
star-forming regions in the inner parsec. We will present a new module 
for Cigale designed especially for low-luminosity AGN that helps us to 
recover the black hole properties even for radiatively inefficient 
accretion disks (like Advection-dominated accretion flow (ADAF) or 
regular truncated disk). We can understand the Eddington rate 
distribution and Black Hole mass function in the local Universe by 
combining this sample with high-luminosity ones, like BASS. We also 
studied some sources of this sample to understand all the details of AGN 
Feedback in action. For one in particular, we will show Spitzer IRS 
spectral maps that reveal spectacular, extended H2 emission from warm 
(200-300 K) molecular gas in the inner 2.5 kpc of the spiral galaxy M58 
(NGC4579). Gemini NIRI imaging of the H2 1-0 S(1) emission line and 
archival ALMA CO 2-1 and HST multiband imaging show that most of the H2 
emission corresponds to lanes of dusty molecular gas that spiral towards 
the galaxy nucleus, where the PAH emission is consistent with excitation 
by UV radiation from old stars in the galaxy bulge rather than star 
formation. The most plausible scenario is that the inner radio jet is 
shock-heating the kpc-scale molecular disk. Jet-shocked H2 may impact 
star formation and help regulate the masses of the stellar bulges and 
SMBH in otherwise normal spiral galaxies. In the future, JWST will 
observe this galaxy (Cycle 2, PI: Lopez, IE) to resolve spatially and 
kinematically the jet-ISM interactions at a scale of 10 pc and determine 
what fraction of the molecular and ionized gas is heated in place and 
what fraction is an outflow. JWST will also yield the molecular and 
ionized gas outflow rates, which we will compare to the SMBH accretion 
and nuclear star formation rates to determine how important these 
processes are in regulating both.

*-MARTES 12 - 11h: Seminario "Mapping the Hubble flow from z~0 to z~7.5 
with HII galaxies"*. La misma estará a cargo del Profesor Honorario *Dr. 
Roberto Terlevich*.
*
*
*Resumen:* I will discuss the tight relation between ionized gas 
velocity dispersions and Balmer emission line luminosities in HII 
galaxies and Giant HII regions, its implications and its use as distance 
indicator to trace the expansion of the Universe up to z ~ 9 with JWST. 
This approach yields tight independent constraints on H0, Ωm and the 
Dark Energy equation of state parameter w. The concordance between our 
determinations of H0, Ωm and w with those from SNIa, BAO and Planck 
provides empirical support for a universal IMF.

*-MIÉRCOLES 13 - 13h: Seminario "Modeling and simulation of geological 
processes: phase transition, dynamic fracture propagation, and 
compaction band formation"*. La misma estará a cargo del *Dr. Victor 
Calo* (Curtin University, Perth, Australia).

*Resumen:* Our modeling and simulation tools seek to describe the 
deformation of large geological structures. In particular, we describe 
various complex rock behaviours and simulate their evolution to 
understanding geological phenomena such as plate tectonics, rock 
properties, and their stress fields. Our models include the effects on 
rock deformation of its microstructure, structural discontinuities, 
fluid interactions, and induced pressure, pressure solution, stress 
corrosion, and different mineral reactions. In this talk, to demonstrate 
the effectiveness and robustness of our tools, we will focus on a few 
exemplar applications to showcase the tools we develop. In particular, 
we will describe metamorphic rocks evolution modeling where 
chemo-mechanical interactions lead to phase transformation and cracking. 
We will also describe a new space-and-time adaptive scheme to model 
complex fracture propagation that circumvents typical mesh dependency 
issues. Lastly, we will study the compaction band formation in 
geomaterials, specifically in porous rocks.
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*-JUEVES 14 - 10h: Seminario "Los orígenes de las Galaxias Ultra 
Difusas: Caracterización de su población de cúmulos globulares en 
distintos entornos"*. La misma estará a cargo del *Lic. Pablo Astudillo 
Sotomayor* (Universidad de Concepción, Chile), invitado del Grupo ALAS.

*Resumen:*  Las galaxias ultra difusas (UDGs) son un subconjunto de 
galaxias de bajo brillo superficial (LSB) caracterizadas por sus grandes 
radios efectivos  r_e > 1,5 kpc y bajo brillo superficial. Estas 
galaxias se han encontrado en una gran variedad de entornos, incluyendo 
el campo, grupos y cúmulos de galaxias. Las diferentes propiedades de 
las UDG y sus cúmulos globulares en función del entorno han planteado la 
cuestión del papel del entorno en la evolución de las UDG y los efectos 
del entorno en su población de cúmulos globulares (CG). En esta 
presentación, hablaremos de nuestro trabajo en curso para estudiar las 
propiedades de los UDG y sus cúmulos globulares en diferentes entorno 
utilizando sus CG como partículas trazadoras para restringir sus orígenes.

*-JUEVES 14 - 12h: Seminario "La actividad del campo Geomagnetico"*. La 
misma estará a cargo del *Geof. Julio César Gianibelli*.*

**

*Resumen:*Diversas formas y particularidades se tienen en la 
determinación de la actividad del campo geomagnético. En la actualidad 
índices que representan esta fenomenología se editan  y comunican por 
las redes.  En esta presentación propongo la evaluación y determinación 
de un índice basado en la intensidad total F del campo geomagnético.

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****Datos de conexión:* ** ** ** **
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Unirse a la reunión zoom: https://us02web.zoom.us/j/89642687970
ID de reunión: 896 4268 7970
Código de acceso: 526656

*A fin de reducir el uso de residuos plásticos, les solicitamos que se 
acerquen con sus propias tazas para el café.*
Aunque estos seminarios serán en formato híbrido, esperamos contar con 
su presencia.

Saludos,

Secyt-FCAG

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Secretaría de Ciencia y Técnica
Facultad de Ciencias Astronómicas y Geofísicas
Horario de atención: lunes a viernes de 8hs a 15hs
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