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ASTRONOMY COLLOQUIUM<br>Black Hole Masses in Active Galaxies

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        1. <b>ASTRONOMY COLLOQUIUM</b><br>Tracing the Cosmic Shutdown of Star Formation in Massive Galaxies
        2. <b>ASTRONOMY COLLOQUIUM</b><br>The Effects of Magnetic Field Morphology on the Determination of Oxygen and Iron Abundances in the Solar Photosphere
        3. <b>ASTRONOMY COLLOQUIUM</b><br>Star Formation Across Space
        4. <b>ASTRONOMY COLLOQUIUM</b><br>Lonely Galaxies: The Baryon Content of Isolated Dwarf Galaxies
        5. <b>ASTRONOMY COLLOQUIUM</b><br>Choose Your Own Adventure: Multiplicity of Planets Among the Smallest Stars
        6. <b>ASTRONOMY COLLOQUIUM</b><br>Why the Invisible Reservoir of Gas Around Galaxies Counts in Galaxy Evolution
        7. <b>ASTRONOMY COLLOQUIUM</b><br>A Galaxy-Scale Fountain of Cold Molecular Gas Pumped by a Black Hole
        9. ASTRONOMY COLLOQUIUM<br>Better Living Through Computation: Exploring the First Generations of Galaxies with Large-Scale Simulations
        10. ASTRONOMY COLLOQUIUM<br>The Search for Earth 2.0
        11. ASTRONOMY COLLOQUIUM<br>The Fast and Furious Lives of High Velocity Clouds
        12. ASTRONOMY COLLOQUIUM<br>Supernovae as Drivers of Dust Evolution in Galaxies
        13. ASTRONOMY COLLOQUIUM<br>How to Measure the Composition of Planet-Forming Material
        14. ASTRONOMY COLLOQUIUM<br>Direct Imaging of Extrasolar Planets and the Gemini Planet Imager
        15. ASTRONOMY COLLOQUIUM<br>Blowing in the Quasar Wind: Feedback from Black Hole Outflows in Major Galaxy Mergers
        16. ASTRONOMY COLLOQUIUM<br>Magellan/MDM Colloquium: Department Members Share Their Current Work Using Magellan/MDM Observatories
        17. ASTRONOMY COLLOQUIUM<br>The Fisk-Vanderbilt Masters-to-PhD Bridge Program: A Model for Increasing Diversity at the PhD Level in Physics & Astronomy
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        19. ASTRONOMY COLLOQUIUM<br>Observing the Formation of Planetary Diversity
        20. ASTRONOMY COLLOQUIUM<br>Lies, Damned Lies, and Statistics: Empirical Constraints on Theories of Planet Formation
        21. ASTRONOMY COLLOQUIUM<br>Black People in Astronomy: Why So Few?
        22. ASTRONOMY COLLOQUIUM <br> Hot on the Trail of Warm Planets Orbiting Cool Stars
        23. ASTRONOMY COLLOQUIUM<br>Galaxy Clusters as Cosmological and Astrophysical Probes
        24. ASTRONOMY COLLOQUIUM <br> Discovery of a Thorne-Zytkow Object Candidate in The Small Magellanic Cloud
        25. ASTRONOMY COLLOQUIUM<br>Where's the Matter? (Tales from the Milky Way's Destructive Past)
        26. ASTRONOMY COLLOQUIUM<br>Measuring the Mass-Radius Relation of Neutron Stars
        27. ASTRONOMY COLLOQUIUM <br> Accretion Disk Outbursts: MHD Simulations (Finally) Confront Reality
        28. ASTRONOMY COLLOQUIUM <br> The Observability of Recoiling Black Holes as Offset Quasars
        29. ASTRONOMY COLLOQUIUM<br>Black Hole Masses in Active Galaxies
        30. ASTRONOMY COLLOQUIUM<br>Using Multiwavelength Variability Studies to Probe the Disk-Jet Connection of Fermi Blazars
        31. ASTRONOMY COLLOQUIUM<br>X-ray Reverberation Mapping in AGN
        32. 3rd Annual Astronomy Undergraduate Poster Session
        33. ASTRONOMY COLLOQUIUM<br>High-Energy-Density Astrophysics in the Laboratory
        34. SPECIAL ASTRONOMY COLLOQUIUM<br>Ralph Baldwin Prize in Astrophysics and Space Sciences<br>Lonely Massive Stars</br>
        35. ASTRONOMY COLLOQUIUM<br>Live Fast Die Young: The Evolution of Massive Stars towards their Death</br>
        36. ASTRONOMY COLLOQUIUM<br>Watching a Little Gas Cloud on its Way into the Galactic Supermassive Black Hole
        37. ASTRONOMY COLLOQUIUM<br>Dwarf Galaxies as Cosmological Probes
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        39. ASTRONOMY COLLOQUIUM<br>Seeing Worlds in Grains of Sand
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        41. ASTRONOMY COLLOQUIUM<br>The ALFALFA Census of Gas-Bearing Galaxies at z=0</br>
        42. ASTRONOMY COLLOQUIUM<br>Accretion Disk Outbursts: MHD Simulations (Finally) Confront Reality
        43. ASTRONOMY COLLOQUIUM<br>3D Spectroscopy of Giant H II Regions in Nearby Spiral Galaxies</br>
        44. ASTRONOMY COLLOQUIUM<br>Star Clusters and High Mass X-Ray Binaries in Nearby Spirals, Mergers, and Starburst Galaxies
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Thursday, October 2, 2014
12:00 AM
411 West Hall

Reverberation mapping, or "echo" mapping, of nearby (z<0.1) active galaxies has provided direct constraints on the mass of the central supermassive black hole in about 50 galaxies.  Furthermore, the size of the region of photoionized gas from which the broad emission lines emanate has been found to scale with the luminosity of the central source.  This radius-luminosity relationship is heavily used to estimate black hole masses in quasars at cosmological distances, and is foundational for our understanding of the interplay between black hole and galaxy growth and evolution.  I will present an overview of the state of the field and discuss current and future work aimed at minimizing the uncertainties in black hole mass determinations in AGNs.