Past Pizza Lunches

Número de entradas: 145

16
Febrero 2018

Communication Signals Used for Remote Sensing


Inicio: 12:15h
Ponente: Serni Ribó (ICE (CSIC-IEEC))
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

The Earth is illuminated in the microwave frequency range by hundreds of communication and broadcasting satellites from geostationary orbit. Their potential for remote sensing of the Earth is enormous, as the collective power and frequency range of the transmitted signals surpasses that of earth-observation…
Inicio: 12:15h
Ponente: Serni Ribó (ICE (CSIC-IEEC))
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)


The Earth is illuminated in the microwave frequency range by hundreds of communication and broadcasting satellites from geostationary orbit. Their potential for remote sensing of the Earth is enormous, as the collective power and frequency range of the transmitted signals surpasses that of earth-observation satellites, and their broad frequency range makes them suitable for atmosphere, land, ocean and cryosphere applications. I will present an overview of the potentialities of such signals for remote sensing and the recent activities we have carried out at our institute.
09
Febrero 2018

Filling up the gaps: on the beginning of modern cosmology


Inicio: 12:15h
Ponente: Emili Elizalde (ICE-CSIC and IEEC)
Lugar: Alberto Lobo Room

In this talk, I will give final shape to a number of reflections that I addressed in previous pizza seminars and wich have to do with the origins of modern cosmology. I will provide a list of additional references that have eventually filled up the still existing gaps. I will argue now, in particular,…
Inicio: 12:15h
Ponente: Emili Elizalde (ICE-CSIC and IEEC)
Lugar: Alberto Lobo Room


In this talk, I will give final shape to a number of reflections that I addressed in previous pizza seminars and wich have to do with the origins of modern cosmology. I will provide a list of additional references that have eventually filled up the still existing gaps. I will argue now, in particular, in favor of the Year 1912 as the one presumably marking the beginning of modern cosmology, and will present my final conclusions on the actual meaning of the words `Big Bang’. For a written reference of my presentation, see “All That Matter ... in One Big Bang ...,” & Other Cosmological Singularities. arXiv:1801.09550 [physics.hist-ph] 25 Jan 2018 https://arxiv.org/pdf/1801.09550.pdf; Preprints 2018, 2018010251 (doi: 10.20944/preprints201801.0251.v1). Elizalde, E. https://www.preprints.org/manuscript/201801.0251/v1
 
02
Febrero 2018

Water Fountains as Signposts of the Onset of the Planetary Nebula Phase


Inicio: 12:15h
Ponente: José María Torrelles Arnedo (ICE, CSIC)
Lugar: Sala Alberto Lobos

Planetary nebulae (PNe) often express beautiful, multipolar, point symmetric shapes - while their progenitors are characterised as having spherical layered structures. As stars exhaust their nuclear fuel and depart from the asymptotic giant branch, they launch powerful jets that are believed to be responsible…
Inicio: 12:15h
Ponente: José María Torrelles Arnedo (ICE, CSIC)
Lugar: Sala Alberto Lobos

Planetary nebulae (PNe) often express beautiful, multipolar, point symmetric shapes - while their progenitors are characterised as having spherical layered structures. As stars exhaust their nuclear fuel and depart from the asymptotic giant branch, they launch powerful jets that are believed to be responsible for creating the diverse shapes of PNe. Spectacular examples of collimated jets are those traced by water masers, in post-AGB objects named “Water Fountains" (WF), with jet speeds ~100 km/s and sizes ~1000 au. WFs are very rare due to their short timescales (~100 yr) and as such the launching mechanism of their collimated jets remains an unresolved puzzle. In this talk, we introduce our VLBI water maser observations of IRAS 18113-2503 showing  a remarkable WF with spectacular bipolar bow-shocks in their high-speed collimated outflows. Using our observations from the VLBA and VERA arrays, we unveil the spatio-kinematical structure of the bipolar bow-shocks and the trigonometric distance to the source (12 kpc). Seen for the first time in WFs, the measured 3D maser velocities (>200 km/s) show that the jets are formed in very short-lived (tens of yr), episodic outbursts (period ~10-20 yr), which are intrinsically linked to the driving source (binary system?). 
26
Enero 2018

The role of black holes in regulating star formation


Inicio: 12:15h
Ponente: Ignacio Martín Navarro (University of Santa Cruz)
Lugar: Sala Alberto Lobos

Black holes are a fundamental ingredient in our current understanding of galaxy formation. In the absence of their feedback, state-of-the-art numerical simulations fail to match the observed properties of massive galaxies. Effectively, within a Lambda Cold Dark Matter Universe, black holes reconcile…
Inicio: 12:15h
Ponente: Ignacio Martín Navarro (University of Santa Cruz)
Lugar: Sala Alberto Lobos

Black holes are a fundamental ingredient in our current understanding of galaxy formation. In the absence of their feedback, state-of-the-art numerical simulations fail to match the observed properties of massive galaxies. Effectively, within a Lambda Cold Dark Matter Universe, black holes reconcile cosmology and galaxy formation theories by regulating baryonic processes. However, despite of this widely-accepted and fundamental role, evidence of black hole regulated star formation remains elusive. I will present our observational efforts to characterize and understand the interplay between black hole activity and star formation, based on detailed stellar populations analyses. Our observations show that black hole and stellar population properties are tightly related, calling for a rich and complex observational framework where star formation, black holes and chemical enrichment evolve coupled in time.
19
Enero 2018

Deep Learning in Space


Inicio: 12:15h
Ponente: Pau Rodríguez López (Centre de Visió per Computador (CVC))
Lugar: Alberto Lobo seminar room

Deep Learning, a connectionist Machine Learning field inspired in biology has revolutionized AI, especially Computer Vision, and it has now great impact on healthcare, industry, media, transport, and science. In this seminar we'll take a quick look on how deep learning works and how it can improve…
Inicio: 12:15h
Ponente: Pau Rodríguez López (Centre de Visió per Computador (CVC))
Lugar: Alberto Lobo seminar room

Deep Learning, a connectionist Machine Learning field inspired in biology has revolutionized AI, especially Computer Vision, and it has now great impact on healthcare, industry, media, transport, and science. In this seminar we'll take a quick look on how deep learning works and how it can improve the detection of new exoplanets, track orbits, know galaxies, and much more.
12
Enero 2018

e-ASTROGAM: a space mission for MeV-GeV gamma-ray astrophysics


Inicio: 12:00h
Ponente: Paolo Cumani (ICE (CSIC-IEEC))
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)

e-ASTROGAM is a space mission dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV with unprecedented sensitivity, angular and energy resolution, combined with polarimetric capability. It will observe the most powerful Galactic and extragalactic sources,…
Inicio: 12:00h
Ponente: Paolo Cumani (ICE (CSIC-IEEC))
Lugar: Alberto Lobo Seminar Room (ICE, UAB Campus)


e-ASTROGAM is a space mission dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV with unprecedented sensitivity, angular and energy resolution, combined with polarimetric capability. It will observe the most powerful Galactic and extragalactic sources, elucidating the nature of their relativistic outflows and their effects on the surroundings. With a line sensitivity in the MeV energy range one to two orders of magnitude better than previous generation instruments, e-ASTROGAM will determine the origin of key isotopes fundamental for the understanding of supernova explosion and the chemical evolution of our Galaxy.  In this seminar I will give an overview of the e-ASTROGAM scientific objectives and its detectors, as well as describing the on-orbit background from trapped charged particles.
 
01
Diciembre 2017

Dense matter in compact stars


Inicio: 12:15h
Ponente: Stefano Carignano (Gran Sasso)
Lugar: Alberto Lobo

What are the properties of matter inside a compact star? One can probably rephrase this question as: what happens to matter when you squeeze it a lot, you force it to be electrically neutral and perhaps add magnetic fields and a few other constraints on top? In this talk, I will give a pedagogical…
Inicio: 12:15h
Ponente: Stefano Carignano (Gran Sasso)
Lugar: Alberto Lobo


What are the properties of matter inside a compact star? One can probably rephrase this question as: what happens to matter when you squeeze it a lot, you force it to be electrically neutral and perhaps add magnetic fields and a few other constraints on top? In this talk, I will give a pedagogical introduction on some possible ways to find an answer to this question, discussing what the relevant degrees of freedom are in this context and how we can try to describe their (sometimes perversely counter-intuitive) properties. I will then briefly discuss some (more or less exotic) phases of matter which might form in the core of compact stars and how astrophysical observations can hopefully help us separate actual realistic scenarios from crazy model artifacts.

24
Noviembre 2017

Integrated Web Interface for PAU Survey


Inicio: 12:15h
Ponente: Martin Folger (ICE)
Lugar: Alberto Lobo Conference Room S1-01

I will describe a web interface that helps with Operation, Data Access and Analysis of the PAU (physics of the accelerating universe) survey. The talk will start with an overview of the aim of the PAU survey and its data management/pipeline system (PAU DM). Some of the specialized tools in the PAU…
Inicio: 12:15h
Ponente: Martin Folger (ICE)
Lugar: Alberto Lobo Conference Room S1-01


I will describe a web interface that helps with Operation, Data Access and Analysis of the PAU (physics of the accelerating universe) survey. The talk will start with an overview of the aim of the PAU survey and its data management/pipeline system (PAU DM). Some of the specialized tools in the PAU DM web interface which will be described are the Nightly Report panel which is used to review the survey progress in order to adjust the current survey plan and the Aperture Inspector tool used to easily analyze PAU science output, inspecting the multitude of data gathered to derive it.
 
17
Noviembre 2017

Finding the double sunsets: close binary stars and large spectroscopic surveys


Inicio: 12:00h
Ponente: Carles Badenes ((University of Pittsburgh/ICCUB))
Lugar: Alberto Lobo Conference Room S1-01

I will discuss our present knowledge of the statistics of stellar multiplicity (the multiplicity fraction and the distribution of periods, mass ratios, and eccentricities), and the implications for stellar evolution, in particular for Type Ia Supernovae (SN Ia). I will describe how multi-epoch radial…
Inicio: 12:00h
Ponente: Carles Badenes ((University of Pittsburgh/ICCUB))
Lugar: Alberto Lobo Conference Room S1-01

I will discuss our present knowledge of the statistics of stellar multiplicity (the multiplicity fraction and the distribution of periods, mass ratios, and eccentricities), and the implications for stellar evolution, in particular for Type Ia Supernovae (SN Ia). I will describe how multi-epoch radial velocity measurements from large spectroscopic surveys can open a new observational window on stellar multiplicity, and present two case studies: white dwarfs in SDSS/SEGUE, and red giants in SDSS/APOGEE. For the white dwarfs, we can measure their merger rate and evaluate their viability as Type Ia SN progenitors. For the red giants, we can explore the interplay between stellar evolution and stellar multiplicity, evaluate the rate of stellar mergers, and uncover a strong dependence of the multiplicity fraction with metallicity.
Institute of Space Sciences (IEEC-CSIC)

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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya