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Past Events

  • 2018 Mar 01

    ITC Colloquium Volker Springel (HITS)

    11:00am to 12:00pm

    Location: 

    Pratt
    “Supercomputer simulations of the emergence of cosmic structures”
     

    Hydrodynamical simulations of galaxy formation have now reached sufficient physical fidelity to allow detailed predictions for their formation and evolution over cosmic time. I will review the foundations of this methodology and describe results from a recent effort to construct a new generation of structure formation...

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  • 2018 Feb 22

    ITC Luncheon

    12:30pm to 1:30pm

    Location: 

    Phillips
    * Pepi Fabbiano (CfA): "Imaging the Hard Continuum and Fe Kalpha Emission of AGNs with Chandra" 

    * Norm Murray (CITA): " FIRE Simulations Produce Carbon Monoxide"
    * Christoph Pfrommer (AIP): “TeV Blazar Heating: from Plasma Instabilities to Cosmological Structure Formation”

    * Sandro Tacchella (CfA): "An Empirical Model for Galaxy Evolution at z≥4"

  • 2018 Feb 22

    ITC Colloquium - Christoph Pfrommer (U of Potsdam)

    11:00am to 12:00pm

    Location: 

    Pratt
    "How cosmic rays shape galaxies and galaxy clusters"

    Understanding the physics of galaxy formation is an outstanding problem in modern astrophysics. Recent cosmological simulations have demonstrated that feedback by star formation, supernovae and active galactic nuclei appears to be critical in obtaining realistic disk galaxies and to slow down star formation to the small...
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  • 2018 Feb 21

    ITC Pizza Lunch

    11:00am to 12:00pm

    Location: 

    Phillips

    Andrea Dupree

    Sleuthing Stellar Winds

    Stellar winds and mass loss affect stellar evolution, impact exoplanets and neighboring stars, and influence the stellar environment. Mass outflows and winds from stars are detected in many clever ways from the ground and from space to reveal signatures of acceleration and variability. In some instances, wind sources on the stellar photospheres can be identified. Wind characteristics (and driving mechanisms) change with stellar temperature and luminosity. Estimates of mass loss rates for cool stars from observations and  theory...

    Read more about ITC Pizza Lunch
  • 2018 Feb 20

    ITC Seminar - Sten Hasselquist (New Mexico State)

    12:00pm to 1:00pm

    Location: 

    Phillips

    "APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy System"

    The Apache Point Observatory Galactic Evolution Experiment provides the opportunity of measuring elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V, Cr, Mn, Fe, Co, and Ni in vast numbers of stars. We analyze the chemical-abundance patterns of these elements for 158 red giant stars belonging to the Sagittarius dwarf galaxy (Sgr). This is the largest sample of Sgr stars with detailed chemical abundances, and it is the first time that C, N, P, K, V, Cr, Co, and Ni have been studied at high resolution...

    Read more about ITC Seminar - Sten Hasselquist (New Mexico State)
  • 2018 Feb 15

    ITC Luncheon

    12:30pm to 1:30pm

    Location: 

    Phillips
    * Rai Weiss (MIT): "Questions and Answers"
     
    * Wyn Evans (IoA): "HEX"
     
    * Anna Schauer (Heidelberg): "Lyman-Werner Escape Fractions from Minihaloes and the First Galaxies...
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  • 2018 Feb 14

    ITC Pizza Lunch - Erin Kara (Maryland)

    11:00am to 12:00pm

    Location: 

    Phillips

    "Observations of Super-Eddington Accretion in the Local Universe"

    Abstract:  Some of the most massive black holes known in the Universe are also the most distant, formed when the Universe was less than a billion years old. This begs the question: how can a ten billion solar mass black holes form in such a short period of time? Rapid accretion at rates exceeding the Eddington Limit—where outward radiation pressure equals to the inward gravitational force—may provide the answer.  Understanding the physics of Super-Eddington accretion is vital for understanding...

    Read more about ITC Pizza Lunch - Erin Kara (Maryland)
  • 2018 Feb 13

    ITC Seminar - Anna Schauer ( Uni Heidelberg)

    12:00pm to 1:00pm

    Location: 

    Phillips
    "The influence of streaming velocities on the formation of the first stars and black holes"

    The so-called streaming velocities are relative velocities between
    baryons and dark matter, originating from a second-order perturbation
    effect at recombination. In regions with high streaming velocities,
    the halo mass function is shifted to lower masses in the early Universe.
    I will give an overview of how streaming velocities delay the formation
    of Population III stars and show that regions with high streaming velocity
    might be good environments for the formation of direct... Read more about ITC Seminar - Anna Schauer ( Uni Heidelberg)
  • 2018 Feb 12

    Special ITC Colloquium - Robert Scherrer

    2:00pm to 3:00pm

    Location: 

    Phillips
    “The Primordial Lithium Problem”
     
    Abstract: Big bang nucleosynthesis (BBN) remains one of the major pillars of modern cosmology. A comparison of predicted and observationally-inferred primordial 2H and 4He abundances implies a baryon density in excellent agreement with the density inferred from the cosmic microwave background. However, there is one piece of the puzzle that does not quite fit: BBN predicts a primordial 7Li abundance that is roughly three times higher than the observationally-inferred abundance. This has been dubbed the primordial...
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