Past Events

  • 2021 Nov 01

    Seminar - Huanqing Chen (U Chicago) and Dhruba Dutta Chowdhury (Yale)

    11:00am to 12:00pm

    Location: 

    Zoom

    " Recovering the Density Fields inside Quasar Proximity Zones at z~6"

    The matter density field at z~6 is very challenging to probe. One of the traditional methods that work successfully at lower redshift is the Lyman-alpha forest in quasar spectra. However, at z~6, the residual neutral hydrogen usually creates saturated absorption, thus much of the information about gas...

    Read more about Seminar - Huanqing Chen (U Chicago) and Dhruba Dutta Chowdhury (Yale)
  • 2021 Oct 28

    ITC Colloquium - Anna Ijjas

    11:00am to 12:20pm

    Location: 

    Zoom
    "Entropy, Black Holes, and the Early Universe"

    Emerging from a big bang in which gravity is strongly coupled and quantum fluctuations of stress-energy and spacetime are both large, the natural expectation is that the total entropy should be nearly maximal and equally distributed among both stress-energy and gravitational degrees of freedom. However, the observed entropy distribution on the last scattering surface is puzzlingly different, as Penrose has emphasized. In this talk, I will introduce the cosmological entropy problem and discuss our recent proposal to evade... Read more about ITC Colloquium - Anna Ijjas
  • 2021 Oct 21

    ITC Colloquium - Eliot Quataert (Princeton)

    11:00am to 12:20pm

    Location: 

    Zoom

    "The Impact of Cosmic Rays on Galaxy Formation"

    Relativistic cosmic-rays created by stellar and black hole feedback may play an important role in many aspects of structure formation. Cosmic-rays can drive outflows from star forming galaxies and heat diffuse gas in the circumgalactic and intergalactic medium.  In this talk I will describe some of the possible impacts of cosmic-rays on galaxy formation, observational probes of their impact, and the theoretical uncertainities in our understanding of the role of cosmic rays in structure...

    Read more about ITC Colloquium - Eliot Quataert (Princeton)
  • 2021 Oct 18

    Seminar - Grace M. Olivier (OSU) and Qianjun Hang (Edinburgh)

    11:00am to 12:00pm

    Location: 

    Zoom

    " Evolution of Stellar Feedback from Reionization to The Milky Way: A Diverse Toolset of Imaging, Spectroscopy, and Modeling for Understanding the Impact of Massive Stars"

    Massive stars contribute incredible amounts of energy to their surroundings across a variety of environments in the universe. Before their exciting deaths, massive stars produce feedback through a...

    Read more about Seminar - Grace M. Olivier (OSU) and Qianjun Hang (Edinburgh)
  • 2021 Oct 14

    ITC Colloquium - Diana Powell (ITC)

    11:00am to 12:00pm

    Location: 

    Zoom
    "Microphysical Insights into Protoplanetary Disks and Exoplanet Atmospheres"

    Abstract: A fundamental understanding of planetary histories and characteristics requires an empirical connection between planet formation and evolved planets—a long-sought goal of astrophysics. This connection is now increasingly possible due to simultaneous revolutions in the observations of protoplanetary disks and exoplanet atmospheres. A key step towards relating these observations of different evolutionary stages is to characterize the composition of material in protoplanetary disks and relate these... Read more about ITC Colloquium - Diana Powell (ITC)
  • 2021 Oct 07

    ITC Colloquium - Jamie Law-Smith (ITC)

    11:00am to 12:00pm

    Location: 

    Zoom
    "Interactions between black holes, stars, and galaxies"

    A physical understanding of the high energy interactions between black holes and stars, coupled with the context of their galactic birthplaces, allows us to use these systems as tools to better understand black holes at all masses, the lives and deaths of stars, and the dynamical mechanisms operating in galaxies. In this talk, I will discuss one particular interaction: the tidal disruption of a star by a supermassive black hole. I will present a library of tidal disruption event simulations and will show that it can be reduced to... Read more about ITC Colloquium - Jamie Law-Smith (ITC)
  • 2021 Sep 30

    ITC Colloquium - Kareem El-Badry (Harvard)

    11:00am to 12:00pm

    Location: 

    Zoom
    "Promises and puzzles in binary evolution"
    Binary stars are foundational to modern astrophysics. They underpin precision measurements of stellar structure, age, and composition; they provide the most stringent tests of general relativity, they make possible the study of faint and rare objects such as black holes and neutron stars, and they are the progenitors of gravitational wave sources. The components of binaries often interact, dramatically changing their evolution and giving rise to a spectacular zoo of astrophysical phenomenology. Large-scale stellar surveys such as Gaia, TESS... Read more about ITC Colloquium - Kareem El-Badry (Harvard)
  • 2021 Sep 27

    Seminar - Natalie Nicole Sanchez (U Washington)

    11:30am to 12:00pm

    Location: 

    Zoom

    Connecting Cosmic Gas Flows and Metal Enrichment to Supermassive Black Hole Growth in Galactic Evolution"

    In this talk, I will discuss the impact of supermassive black hole (SMBH) feedback on the gas phase evolution of Milky Way-mass (MW-mass) galaxies. Both my simulation suites were created with the N-body+Smoothed particle hydrodynamics code, ChaNGa, and include a...

    Read more about Seminar - Natalie Nicole Sanchez (U Washington)
  • 2021 Sep 23

    ITC Colloquium - Hang Yu (Caltech)

    11:00am to 12:00pm

    Location: 

    Zoom
    "Centihertz gravitational-wave astronomy: from hierarchical black-hole triples to ultra-compact white-dwarf binaries"

    Future space-borne gravitational-wave (GW) observatories are sensitive to a rich array of astrophysical systems in the centihertz band. Here we focus on two science cases specifically. The first is hierarchical black-hole (BH) triple systems in galactic nuclei. Such a system consists of a stellar-mass inner binary orbiting around a supermassive BH (SMBH). We show that the orbital angular momentum (AM) of the inner binary will precess around the outer orbital... Read more about ITC Colloquium - Hang Yu (Caltech)

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