{
    "154544-21917917":
    {
        "datetime_modified":"20261104T132203",
        "datetime_start":"20261112T153000",
        "datetime_end":"20261112T163000",
        "has_end_time":1,
        "date_start":"2026-11-12",
        "date_end":"2026-11-12",
        "time_start":"15:30:00",
        "time_end":"16:30:00",
        "time_zone":"America\/Detroit",
        "event_title":"Do active galactic nuclei behave the way galaxy formation theorists need them to?",
        "occurrence_title":"",
        "combined_title":"Do active galactic nuclei behave the way galaxy formation theorists need them to?: Dr. Michael Blanton",
        "event_subtitle":"Dr. Michael Blanton",
        "event_type":"Conference \/ Symposium",
        "event_type_id":"5",
        "description":"I discuss what can be learned about galaxy formation theories from studying how active galactic nuclei\n(AGN) occupy galaxies. In simulations, AGN play the role of quenching and preventing further star\nformation in the most massive galaxies, preventing them from becoming even higher stellar mass than they\nare. The cosmological simulations require subgrid physics to describe star formation processes as well as\nblack hole growth and feedback, both of which are complicated, nonlinear processes occurring at AU scales,\nwithin simulations with at best about 10 to 100 pc resolution. Among the major cosmological simulation\ncodes, there are many different implementations of this subgrid physics that all lead to predictions of the\nstellar mass function and star formation rates of galaxies that agree with observations, and this agreement is\ntaken very seriously as validation of the basic picture. These different implementations nevertheless lead to\nquite different predictions for how AGN populate galaxies as a function of mass and star formation rate.\nThese predictions, in contrast to those regarding stellar properties of galaxies, are almost never compared\nagainst observations. I describe a research program to perform these tests. This program requires a major\nrevision of the statistics of AGN demographics in local galaxies, which in many cases have been performed\npreviously without regard to the dramatic selection effects on AGN samples in galaxies. Although there are\nmany methodological difficulties in interpreting the AGN predictions from galaxy formation simulations, I\nargue that observations of the AGN population can be used to distinguish between the simulations.",
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        "location_name":"West Hall",
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        "tags":["AEM Featured","astrophysics","Colloquium","Colloquium Series","Physics","Talk"],
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