Past Talks @ ICE

Número de entradas: 31

17
Julio 2018

HAWKs: a dedicated Survey to unveil the hidden Galactic population of quiescent black holes


Inicio: 12:00h
Ponente: Jorge Casares (IAC)
Lugar: Alberto Lobo

We propose to exploit a novel strategy to uncover the Galactic population of quiescent black holes (BHs) in X-ray binaries. This is based on a new concept, the photometric mass function (PMF), which opens up the possibility of an efficient identification of dynamical BHs in large FOVs. It exploits the…
Inicio: 12:00h
Ponente: Jorge Casares (IAC)
Lugar: Alberto Lobo

We propose to exploit a novel strategy to uncover the Galactic population of quiescent black holes (BHs) in X-ray binaries. This is based on a new concept, the photometric mass function (PMF), which opens up the possibility of an efficient identification of dynamical BHs in large FOVs. It exploits the width of the Halpha emission line arising from the accretion disc, to be measured photometrically through a combination of custom Halpha filters. Details of the technique and survey strategy are given in Casares 2018 (MNRAS 473 5195).  

We estimate that a dedicated survey of ∼800 deg2 at depth r=22 with three special Halpha  filters are required to unveil ∼100 new dynamical BHs, an order of magnitude improvement over the known population. For comparison, two centuries would be needed to produce an enlarged sample of ~100 dynamical BHs from X-ray transients at the current discovery rate. The survey, which we name HAWKs (after "HAlpha-Width Kilo-deg Survey”) will also deliver a census of other Halpha emitting objects - such as Cataclysmic Variables, accreting millisecond pulsars, Symbiotic binaries, YSOs, etc.- to unprecedented depths. HAWKs will become a legacy survey for follow-up studies of Halpha emitting populations in the Galaxy.
27
Junio 2018

A Herschel view of protoplanetary disks: dust growth and photoevaporation


Inicio: 12:00h
Ponente: Karina Carolina Maucó (Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México)
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

Planetary systems have long been known to form from the gas and dust of circumstellar disks. However, the study of several important physical processes, such as dust growth, photoevaporation or disk dispersal, requires observations across a wide range of wavelengths and at different evolutionary stages.…
Inicio: 12:00h
Ponente: Karina Carolina Maucó (Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México)
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

Planetary systems have long been known to form from the gas and dust of circumstellar disks. However, the study of several important physical processes, such as dust growth, photoevaporation or disk dispersal, requires observations across a wide range of wavelengths and at different evolutionary stages. In this talk I will show the results of the modeling of the spectral energy distributions of ~30 T Tauri stars in the Orion OB1 sub-asociations which have been observed with Herschel at 70 and 160 um. Our objects have ages in the range of ~3-10 Myr. Several objects revealed the presence of holes and gaps, likely produced by the dynamical interaction between the disks and young planets in them. In the sigma Ori cluster we found clear evidence of external photoevaporation due to the radiation from the multiple-star system at its center. VLA observations show free-free emission associated with ionized gas for some sources. They also exhibit forbidden optical emission lines related with photoevaporating winds in high resolution spectra taken with MIKE at the Las Campanas Observatory in Chile.
29
Mayo 2018

Reading between the lines: Adventures in spectroscopy of young and wild stars and their environments


Inicio: 12:00h
Ponente: Aurora Sicilia-Aguilar (SUPA, School of Science and Engineering, University of Dundee (UK))
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

Emission lines are one of the defining characteristics of young stars, and carry an overwhelming (and not-so-easy-to-extract) amount ofinformation about accretion and activity processes in the stellar magnetosphere and innermost disk. Using time-resolved spectroscopy covering several rotational and…
Inicio: 12:00h
Ponente: Aurora Sicilia-Aguilar (SUPA, School of Science and Engineering, University of Dundee (UK))
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

Emission lines are one of the defining characteristics of young stars, and carry an overwhelming (and not-so-easy-to-extract) amount ofinformation about accretion and activity processes in the stellar magnetosphere and innermost disk. Using time-resolved spectroscopy covering several rotational and disk orbital periods, we can obtain a very detailed view of the structure and variability of accretion columns and spots and information on the presence and launching points of stellar/disk winds in young stars. Time-resolved emission (and absorption) line spectroscopy can also trace parts of the inner disk at
scales that are not accessible by direct imaging or interferometry. Understanding these processes and how they affect the observed spectra can also help us to identify (or rule out) the presence of young and newly-formed planets and stellar companions that may be perturbing the disk.

I will present the results for four stars with very different spectral types and behaviours (EX Lupi, GW Ori, ASASSN-13db, and ZCMa), discussing the power and limitations of emission line tomography and exploring what we can learn from "reading between the (spectral) lines" in these and other objects.

Finally, I will also discuss how we can apply similar analysis techniques to other types of sources and to the analysis of molecular line profiles in star-forming regions, to explore and visualize the velocity structure and the formation history of the cluster.
 
04
Abril 2018

The early Universe as observed by the GTC


Inicio: 12:30h
Ponente: José Miguel Rodríguez Espinosa (Instituto de Astrofísica de Canarias)
Lugar: Sala Alberto Lobos

We have been using SHARDS, the ESO/GTC survey, to simultaneously detect both Lyman α emitters (LAE) and Lyman Break Galaxies (LBG). We have gathered a sample of 1558 LAEs and LBGs with redshifts spanning the range from 3.5 to 6.5. We have determined their star formation rates, Equivalent Width, Luminosity…
Inicio: 12:30h
Ponente: José Miguel Rodríguez Espinosa (Instituto de Astrofísica de Canarias)
Lugar: Sala Alberto Lobos

We have been using SHARDS, the ESO/GTC survey, to simultaneously detect both Lyman α emitters (LAE) and Lyman Break Galaxies (LBG). We have gathered a sample of 1558 LAEs and LBGs with redshifts spanning the range from 3.5 to 6.5. We have determined their star formation rates, Equivalent Width, Luminosity functions and clustering properties. We show the advantages of using a collection of relatively narrow filters to avoid interlopers. Finally, I will discuss the work we have done to search for clustering around to star forming sources in the Subaru Deep field, where we have found a rich proto-cluster at z= 6.5. I will show the long process we have pursue to deal with the data and determine the properties of this proto-cluster, which will eventually evolve into a cluster at z= 0 larger than Coma. 
28
Marzo 2018

The early Universe as observed by the GTC


Inicio: 00:00h
Ponente: José Miguel Rodríguez Espinosa (Instituto de Astrofísica de Canarias)
Lugar: Sala Alberto Lobos

We have been using SHARDS, the ESO/GTC survey, to simultaneously detect both Lyman α emitters (LAE) and Lyman Break Galaxies (LBG). We have gathered a sample of 1558 LAEs and LBGs with redshifts spanning the range from 3.5 to 6.5. We have determined their star formation rates, Equivalent Width, Luminosity…
Inicio: 00:00h
Ponente: José Miguel Rodríguez Espinosa (Instituto de Astrofísica de Canarias)
Lugar: Sala Alberto Lobos


We have been using SHARDS, the ESO/GTC survey, to simultaneously detect both Lyman α emitters (LAE) and Lyman Break Galaxies (LBG). We have gathered a sample of 1558 LAEs and LBGs with redshifts spanning the range from 3.5 to 6.5. We have determined their star formation rates, Equivalent Width, Luminosity functions and clustering properties. We show the advantages of using a collection of relatively narrow filters to avoid interlopers. Finally, I will discuss the work we have done to search for clustering around to star forming sources in the Subaru Deep field, where we have found a rich proto-cluster at z= 6.5. I will show the long process we have pursue to deal with the data and determine the properties of this proto-cluster, which will eventually evolve into a cluster at z= 0 larger than Coma. 

28
Marzo 2018

The early Universe as observed by the GTC


Inicio: 00:00h
Ponente: José Miguel Rodríguez Espinosa (Instituto de Astrofísica de Canarias)
Lugar: Sala Alberto Lobos

We have been using SHARDS, the ESO/GTC survey, to simultaneously detect both Lyman α emitters (LAE) and Lyman Break Galaxies (LBG). We have gathered a sample of 1558 LAEs and LBGs with redshifts spanning the range from 3.5 to 6.5. We have determined their star formation rates, Equivalent Width, Luminosity…
Inicio: 00:00h
Ponente: José Miguel Rodríguez Espinosa (Instituto de Astrofísica de Canarias)
Lugar: Sala Alberto Lobos

We have been using SHARDS, the ESO/GTC survey, to simultaneously detect both Lyman α emitters (LAE) and Lyman Break Galaxies (LBG). We have gathered a sample of 1558 LAEs and LBGs with redshifts spanning the range from 3.5 to 6.5. We have determined their star formation rates, Equivalent Width, Luminosity functions and clustering properties. We show the advantages of using a collection of relatively narrow filters to avoid interlopers. Finally, I will discuss the work we have done to search for clustering around to star forming sources in the Subaru Deep field, where we have found a rich proto-cluster at z= 6.5. I will show the long process we have pursue to deal with the data and determine the properties of this proto-cluster, which will eventually evolve into a cluster at z= 0 larger than Coma. 
15
Marzo 2018

Black holes and other compact objects in metric-affine Ricci-based theories of gravity


Inicio: 12:00h
Ponente: Diego Rubiera-García (Institute of Astrophysics, University of Lisbon)
Lugar: Alberto Lobo room

I will discuss recent progress on the existence of black holes and horizonless compact objects in a class of theories constructed out of contractions of the Ricci tensor with the metric, and formulated on a metric-affine approach, where metric and affine connection are independent degrees of freedom.…
Inicio: 12:00h
Ponente: Diego Rubiera-García (Institute of Astrophysics, University of Lisbon)
Lugar: Alberto Lobo room

I will discuss recent progress on the existence of black holes and horizonless compact objects in a class of theories constructed out of contractions of the Ricci tensor with the metric, and formulated on a metric-affine approach, where metric and affine connection are independent degrees of freedom. These theories yield ghost-free second-order field equations and contain just the two standard tensor polarization models of the gravitational field that propagate at the speed of light, thus allowing these theories to survive the slaughter on modified theories of gravity resulting from the beginning of multimessenger astronomy. Several aspects of these theories and their solutions will be discussed
05
Marzo 2018

Black holes and other compact objects in metric-affine Ricci-based theories of gravity


Inicio: 00:00h
Ponente: Diego Rubiera-Garcia (Institute of Astrophysics, University of Lisbon)
Lugar: Alberto Lobo room

I will discuss recent progress on the existence of black holes and horizonless compact objects in a class of theories constructed out of contractions of the Ricci tensor with the metric, and formulated on a metric-affine approach, where metric and affine connection are independent degrees of freedom.…
Inicio: 00:00h
Ponente: Diego Rubiera-Garcia (Institute of Astrophysics, University of Lisbon)
Lugar: Alberto Lobo room

I will discuss recent progress on the existence of black holes and horizonless compact objects in a class of theories constructed out of contractions of the Ricci tensor with the metric, and formulated on a metric-affine approach, where metric and affine connection are independent degrees of freedom. These theories yield ghost-free second-order field equations and contain just the two standard tensor polarization models of the gravitational field that propagate at the speed of light, thus allowing these theories to survive the slaughter on modified theories of gravity resulting from the beginning of multimessenger astronomy. Several aspects of these theories and their solutions will be discussed
15
Enero 2018

The ESPRESSO spectrograph and the quest for ExoEarths


Inicio: 12:00h
Ponente: Jonay I. González Hernández (Instituto de Astrofísica de Canarias (IAC, Tenerife, Canary Islands, Spain))
Lugar: Alberto Lobo Seminar Room

ESPRESSO (Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations) is a VLT ultra-stable high resolution spectrograph aimed at detecting Earth-mass exoplanets in the habitable zone of quiet, nearby G to M dwarf stars. The spectrograph is located in the combined Coudé Lab of…
Inicio: 12:00h
Ponente: Jonay I. González Hernández (Instituto de Astrofísica de Canarias (IAC, Tenerife, Canary Islands, Spain))
Lugar: Alberto Lobo Seminar Room

ESPRESSO (Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations) is a VLT ultra-stable high resolution spectrograph aimed at detecting Earth-mass exoplanets in the habitable zone of quiet, nearby G to M dwarf stars.

The spectrograph is located in the combined Coudé Lab of the VLT and will be able to operate either using one 8.2m-UT or simultaneously with several of the four UT via four optical Coudé trains. ESPRESSO is expected to achieve a radial velocity precision of 10 cm/s, thus opening the possibility to explore new frontiers in science such as the search for rocky planets, the measurement of the variation of physical constants, or the analysis of the chemical composition of stars in nearby galaxies.

In this talk I will show the main characteristics of the ESPRESSO instrument and the work we have been doing with the aim of finding Earth-like planets.
 
21
Diciembre 2017

Let there be light -- faint galaxies and their pathways of formation


Inicio: 12:00h
Ponente: Anna Ferré-Mateu (Swinburne University of Technology)
Lugar: Sala Alberto Lobos

Only once in a generation is there the opportunity to reveal the basic properties of a new galaxy type for the first time. With the advent of more sensitive instruments in the current large telescopes, an entirely new universe is being revealed, as it had never been seen before. And it is a challenging…
Inicio: 12:00h
Ponente: Anna Ferré-Mateu (Swinburne University of Technology)
Lugar: Sala Alberto Lobos


Only once in a generation is there the opportunity to reveal the basic properties of a new galaxy type for the first time. With the advent of more sensitive instruments in the current large telescopes, an entirely new universe is being revealed, as it had never been seen before. And it is a challenging one, a low-luminosity universe that is populated by a myriad of new galaxies that are classified into new fancy families: the ultra-compact dwarfs (UCDs), the compact ellipticals (cEs) and the ultra-diffuse galaxies (UDGs). 
Despite some attempts to characterize and understand such galaxies, a recurrent topic prevails: what are they really? Are they intrinsic objects, i.e. were they formed as we see them now?; or were they initially other types of galaxies that have later evolved due to external interactions, which shaped them into what we see now? In the case of cEs, we have been lucky enough to catch some of them 'in the act', being stripped by a larger galaxy. However, at the same time, some of them have been found to be completely isolated and with no signs of interaction. In this talk I will discuss the different pathways for cE formation and the expectations from their super massive black holes. I will also show how a similarly detailed study for all the faint families together can provide crucial clues for the galaxy evolution paradigm.
Institute of Space Sciences (IEEC-CSIC)

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08193 Barcelona.
Phone: +34 93 737 9788
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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