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X-ORIGINAL-URL:https://www.oa-roma.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
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DTSTART:20170326T010000
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DTSTART:20171029T010000
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DTSTART:20180325T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181002T114500
DTEND;TZID=Europe/Rome:20181002T124500
DTSTAMP:20260406T070820
CREATED:20180825T061901Z
LAST-MODIFIED:20180825T061901Z
UID:4765-1538480700-1538484300@www.oa-roma.inaf.it
SUMMARY:Four years of science with SPHERE/VLT
DESCRIPTION:SPHERE/VLT is an extreme adaptive optics instrument designed to directly image exoplanets. It was designed and build by a European consortium (including laboratories from France\, Italy\, Germany\, Switzerland and the Netherlands) from  and saw its first light in 2014. Most of the guaranteed time observations (GTO) are related to exoplanets and young disk. I will briefly present some results from these programs. I will then focus on the  “Other Science” part of the GTO\, aiming at showing that SPHERE is a versatile instrument able to answer key question in a variety of topics. I will present the results obtained via this program\, ranging from 3D mapping of asteroids to star clusters via jets from young stars and evolved stars\, including the first direct image of the surface of  stars.
URL:https://www.oa-roma.inaf.it/event/colloquium-eric-lagadec-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181002T114500
DTEND;TZID=Europe/Rome:20181002T124500
DTSTAMP:20260406T070820
CREATED:20180825T061901Z
LAST-MODIFIED:20180825T061901Z
UID:4344-1538480700-1538484300@www.oa-roma.inaf.it
SUMMARY:Four years of science with SPHERE/VLT
DESCRIPTION:SPHERE/VLT is an extreme adaptive optics instrument designed to directly image exoplanets. It was designed and build by a European consortium (including laboratories from France\, Italy\, Germany\, Switzerland and the Netherlands) from  and saw its first light in 2014. Most of the guaranteed time observations (GTO) are related to exoplanets and young disk. I will briefly present some results from these programs. I will then focus on the  “Other Science” part of the GTO\, aiming at showing that SPHERE is a versatile instrument able to answer key question in a variety of topics. I will present the results obtained via this program\, ranging from 3D mapping of asteroids to star clusters via jets from young stars and evolved stars\, including the first direct image of the surface of  stars.
URL:https://www.oa-roma.inaf.it/event/colloquium-eric-lagadec/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181009T114500
DTEND;TZID=Europe/Rome:20181009T124500
DTSTAMP:20260406T070820
CREATED:20180914T065151Z
LAST-MODIFIED:20180914T065151Z
UID:4379-1539085500-1539089100@www.oa-roma.inaf.it
SUMMARY:The MESSIER surveyor: lifting the veil on the ultra low surface brightness universe
DESCRIPTION:The MESSIER satellite has been designed to explore the extremely low surface brightness universe at UV and optical wavelengths. The two driving science cases target the mildly- and highly non-linear regimes of structure formation to test two key predictions of the LCDM scenario: (1) the detection of the putative large number of galaxy satellites\, and (2) the identification of the filaments of the cosmic web. The science requirements imply challenging instrumentation issues which have only recently been solved. The satellite will drift scan the entire sky in 6 bands covering the 200-1000 nm wavelength range to reach the unprecedented surface brightness levels of 34 mag/arcsec^2 in the optical and 37 mag/arcsec^2 in the UV. As usual when uncovering new volumes in parameter space\, many important secondary science cases will also result as free by-products and will be discussed in some detail: the actual luminosity function of galaxies\, the contribution and role of intracluster light\, the fluctuations of the cosmological background radiation at UV and optical wavelengths\, the warm molecular hydrogen content of galaxies at z=0.25\, time-domain studies of supernovae and tidal disruption events\, the chemical enrichment of the interstellar medium through mass loss of red giant stars and the accurate measure of the BAO scale at z=0.7 with over 30 million galaxies detected in Lyman-alpha at this redshift. It will provide the first space-based reference UV-optical photometric catalogue of the entire sky\, and synergies with GAIA\, EUCLID and WFIRST will also be discussed.
URL:https://www.oa-roma.inaf.it/event/the-messier-surveyor-lifting-the-veil-on-the-ultra-low-surface-brightness-universe/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181009T114500
DTEND;TZID=Europe/Rome:20181009T124500
DTSTAMP:20260406T070820
CREATED:20180914T065151Z
LAST-MODIFIED:20180914T065151Z
UID:4769-1539085500-1539089100@www.oa-roma.inaf.it
SUMMARY:The MESSIER surveyor: lifting the veil on the ultra low surface brightness universe
DESCRIPTION:The MESSIER satellite has been designed to explore the extremely low surface brightness universe at UV and optical wavelengths. The two driving science cases target the mildly- and highly non-linear regimes of structure formation to test two key predictions of the LCDM scenario: (1) the detection of the putative large number of galaxy satellites\, and (2) the identification of the filaments of the cosmic web. The science requirements imply challenging instrumentation issues which have only recently been solved. The satellite will drift scan the entire sky in 6 bands covering the 200-1000 nm wavelength range to reach the unprecedented surface brightness levels of 34 mag/arcsec^2 in the optical and 37 mag/arcsec^2 in the UV. As usual when uncovering new volumes in parameter space\, many important secondary science cases will also result as free by-products and will be discussed in some detail: the actual luminosity function of galaxies\, the contribution and role of intracluster light\, the fluctuations of the cosmological background radiation at UV and optical wavelengths\, the warm molecular hydrogen content of galaxies at z=0.25\, time-domain studies of supernovae and tidal disruption events\, the chemical enrichment of the interstellar medium through mass loss of red giant stars and the accurate measure of the BAO scale at z=0.7 with over 30 million galaxies detected in Lyman-alpha at this redshift. It will provide the first space-based reference UV-optical photometric catalogue of the entire sky\, and synergies with GAIA\, EUCLID and WFIRST will also be discussed.
URL:https://www.oa-roma.inaf.it/event/the-messier-surveyor-lifting-the-veil-on-the-ultra-low-surface-brightness-universe-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181016T114500
DTEND;TZID=Europe/Rome:20181016T124500
DTSTAMP:20260406T070820
CREATED:20180924T160119Z
LAST-MODIFIED:20180924T160119Z
UID:4420-1539690300-1539693900@www.oa-roma.inaf.it
SUMMARY:Transient spiral arms and galaxy rotation curves
DESCRIPTION:The complex spatial structure evident in spiral galaxies is understood either in terms of instabilities of quasi-stationary states\, or a result of dissipative non-gravitational interactions. We illustrate here\, using numerical simulations\, that purely self-gravitating systems evolving from quite simple initial configurations can give rise easily to structures of this kind of which the lifetime can be large compared to the dynamical characteristic time\, but short compared to the collisional relaxation time scale. More specifically\, for a broad range of non-spherical and non-uniform rotating initial conditions\, gravitational relaxation gives rise quite generically to long-lived non-stationary structures of a rich variety\, characterized by spiral-like arms\, bars and even ring-like structure in special cases. These structures are a feature of the intrinsically out-of-equilibrium nature of the system’s collapse\, associated with a part of the system’s mass while the bulk is well virialized. They are characterized by predominantly radial motions in their outermost parts\, but also incorporate an extended flattened region which rotates coherently about a well virialized core of triaxial shape with an approximately isotropic velocity dispersion. We briefly discuss the possible relevance of these simple toy models to the observed structure of real galaxies. On the one hand\, we discuss the determination of the velocity fields of THINGS galaxies. On the other hand we consider recent observations in our Galaxy  (APOGEE and GAIA) that show that the galactic disk seems not to be a time-independent axisymmetric system. We conclude by stressing that these simple models illustrate the possibility that the observed apparent motions of spiral galaxies might be explained by non-trivial non-stationary mass and velocity distributions without invoking a large amount of dark matter halo or a modification of Newtonian gravity.
URL:https://www.oa-roma.inaf.it/event/transient-spiral-arms-and-galaxy-rotation-curves/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181016T114500
DTEND;TZID=Europe/Rome:20181016T124500
DTSTAMP:20260406T070820
CREATED:20180924T160119Z
LAST-MODIFIED:20180924T160119Z
UID:4772-1539690300-1539693900@www.oa-roma.inaf.it
SUMMARY:Transient spiral arms and galaxy rotation curves
DESCRIPTION:The complex spatial structure evident in spiral galaxies is understood either in terms of instabilities of quasi-stationary states\, or a result of dissipative non-gravitational interactions. We illustrate here\, using numerical simulations\, that purely self-gravitating systems evolving from quite simple initial configurations can give rise easily to structures of this kind of which the lifetime can be large compared to the dynamical characteristic time\, but short compared to the collisional relaxation time scale. More specifically\, for a broad range of non-spherical and non-uniform rotating initial conditions\, gravitational relaxation gives rise quite generically to long-lived non-stationary structures of a rich variety\, characterized by spiral-like arms\, bars and even ring-like structure in special cases. These structures are a feature of the intrinsically out-of-equilibrium nature of the system’s collapse\, associated with a part of the system’s mass while the bulk is well virialized. They are characterized by predominantly radial motions in their outermost parts\, but also incorporate an extended flattened region which rotates coherently about a well virialized core of triaxial shape with an approximately isotropic velocity dispersion. We briefly discuss the possible relevance of these simple toy models to the observed structure of real galaxies. On the one hand\, we discuss the determination of the velocity fields of THINGS galaxies. On the other hand we consider recent observations in our Galaxy  (APOGEE and GAIA) that show that the galactic disk seems not to be a time-independent axisymmetric system. We conclude by stressing that these simple models illustrate the possibility that the observed apparent motions of spiral galaxies might be explained by non-trivial non-stationary mass and velocity distributions without invoking a large amount of dark matter halo or a modification of Newtonian gravity.
URL:https://www.oa-roma.inaf.it/event/transient-spiral-arms-and-galaxy-rotation-curves-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181018T150000
DTEND;TZID=Europe/Rome:20181018T150000
DTSTAMP:20260406T070820
CREATED:20180725T064455Z
LAST-MODIFIED:20180725T064455Z
UID:4158-1539874800-1539874800@www.oa-roma.inaf.it
SUMMARY:What is the role of the environment in shaping early-type galaxy sizes? Has it changed in the last 10 Gyr?
DESCRIPTION:Understanding galaxy evolution requires understanding the impact of cosmic time\, environment\, mass\, and halo growth at least\, because likely a combination of them leads to the quenching of star formation and the emergence of the galaxy populations we see in the nearby Universe. In the talk\, I will present the picture coming out from two mass-selected samples of red-sequence early-type galaxies in the general field.
URL:https://www.oa-roma.inaf.it/event/what-is-the-role-of-the-environment-in-shaping-early-type-galaxy-sizes-did-it-changed-in-the-last-10-gyr/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181018T150000
DTEND;TZID=Europe/Rome:20181018T150000
DTSTAMP:20260406T070820
CREATED:20180725T064455Z
LAST-MODIFIED:20180725T064455Z
UID:4750-1539874800-1539874800@www.oa-roma.inaf.it
SUMMARY:What is the role of the environment in shaping early-type galaxy sizes? Has it changed in the last 10 Gyr?
DESCRIPTION:Understanding galaxy evolution requires understanding the impact of cosmic time\, environment\, mass\, and halo growth at least\, because likely a combination of them leads to the quenching of star formation and the emergence of the galaxy populations we see in the nearby Universe. In the talk\, I will present the picture coming out from two mass-selected samples of red-sequence early-type galaxies in the general field.
URL:https://www.oa-roma.inaf.it/event/what-is-the-role-of-the-environment-in-shaping-early-type-galaxy-sizes-did-it-changed-in-the-last-10-gyr-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181023T114500
DTEND;TZID=Europe/Rome:20181023T124500
DTSTAMP:20260406T070820
CREATED:20180725T064618Z
LAST-MODIFIED:20180725T064618Z
UID:4160-1540295100-1540298700@www.oa-roma.inaf.it
SUMMARY:Highlights from the ESA Rosetta  mission
DESCRIPTION:The Rosetta/Philae mission of the European Space Agency marked a turning point in cometary space exploration. Launched on March 2004\, Rosetta needed 10 years of interplanetary journey to arrive around its main target\, the comet 67P/Churyumov-Gerasimenko.  Rosetta orbited around the comet for about two years\, providing the unique opportunity to continuously investigate the 67P nucleus composition\, activity\, and its evolution during the orbit.  For the first time in the history of the space exploration\, Rosetta delivered a lander\, Philae\, on a cometary surface.\nA large complement of scientific experiments designed to complete the most detailed study of a comet ever attempted are on board Rosetta\, including cameras\, spectrometers\, radio science\, dust and plasma analyser and so on. More than 80\,000 images of the comet have been acquired with the OSIRIS imaging system with a spatial resolution ranging from several meters to a few centimeters per pixel.  I will present the main scientific results of this extraordinary space mission on the structure\, geomorphology\, and surface composition of the comet\, and their implications on the formation of our solar system.
URL:https://www.oa-roma.inaf.it/event/colloquium-sonia-fornasier/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181023T114500
DTEND;TZID=Europe/Rome:20181023T124500
DTSTAMP:20260406T070820
CREATED:20180725T064618Z
LAST-MODIFIED:20180725T064618Z
UID:4751-1540295100-1540298700@www.oa-roma.inaf.it
SUMMARY:Highlights from the ESA Rosetta  mission
DESCRIPTION:The Rosetta/Philae mission of the European Space Agency marked a turning point in cometary space exploration. Launched on March 2004\, Rosetta needed 10 years of interplanetary journey to arrive around its main target\, the comet 67P/Churyumov-Gerasimenko.  Rosetta orbited around the comet for about two years\, providing the unique opportunity to continuously investigate the 67P nucleus composition\, activity\, and its evolution during the orbit.  For the first time in the history of the space exploration\, Rosetta delivered a lander\, Philae\, on a cometary surface.\nA large complement of scientific experiments designed to complete the most detailed study of a comet ever attempted are on board Rosetta\, including cameras\, spectrometers\, radio science\, dust and plasma analyser and so on. More than 80\,000 images of the comet have been acquired with the OSIRIS imaging system with a spatial resolution ranging from several meters to a few centimeters per pixel.  I will present the main scientific results of this extraordinary space mission on the structure\, geomorphology\, and surface composition of the comet\, and their implications on the formation of our solar system.
URL:https://www.oa-roma.inaf.it/event/colloquium-sonia-fornasier-2/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181030T114500
DTEND;TZID=Europe/Rome:20181030T124500
DTSTAMP:20260406T070820
CREATED:20180725T064730Z
LAST-MODIFIED:20180725T064730Z
UID:4162-1540899900-1540903500@www.oa-roma.inaf.it
SUMMARY:Cepheid variables in the Gaia Data Release 2 and the extragalactic distance scale
DESCRIPTION:Classical Cepheids are the most important primary indicators for the extragalactic distance scale.\nEstablishing the precise zero points of their Period-Luminosity and Period-Wesenheit (PL/PW) relations\nhas profound consequences on the estimate of H0. Type II Cepheids are also important distance indicators and tracers of old stellar populations. The recent Data Release 2 (DR2) of the Gaia Spacecraft includes photometry and parallaxes for\nthousands of classical and type II cepheids. Adopting a subsample of well studied objects\, we use the Gaia parallaxes to derive new optical/Near Infra-Red PL/PW relations for the Galactic Cepheids. We use these information\, coupled with proprietary data from the Vista Magellanic Cloud (VMC) survey\, to discuss the zero point of the Gaia parallaxes and its impact on the extragalactic distance scale and the measurement of H0.
URL:https://www.oa-roma.inaf.it/event/colloquium-marcella-marconi/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181030T114500
DTEND;TZID=Europe/Rome:20181030T124500
DTSTAMP:20260406T070820
CREATED:20180725T064730Z
LAST-MODIFIED:20180725T064730Z
UID:4752-1540899900-1540903500@www.oa-roma.inaf.it
SUMMARY:Cepheid variables in the Gaia Data Release 2 and the extragalactic distance scale
DESCRIPTION:Classical Cepheids are the most important primary indicators for the extragalactic distance scale.\nEstablishing the precise zero points of their Period-Luminosity and Period-Wesenheit (PL/PW) relations\nhas profound consequences on the estimate of H0. Type II Cepheids are also important distance indicators and tracers of old stellar populations. The recent Data Release 2 (DR2) of the Gaia Spacecraft includes photometry and parallaxes for\nthousands of classical and type II cepheids. Adopting a subsample of well studied objects\, we use the Gaia parallaxes to derive new optical/Near Infra-Red PL/PW relations for the Galactic Cepheids. We use these information\, coupled with proprietary data from the Vista Magellanic Cloud (VMC) survey\, to discuss the zero point of the Gaia parallaxes and its impact on the extragalactic distance scale and the measurement of H0.
URL:https://www.oa-roma.inaf.it/event/colloquium-marcella-marconi-2/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
END:VCALENDAR