STARE: Testing Black Hole Mass Measurements in Active Galaxies

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Black hole masses are fundamental measurements that inform our knowledge of the formation and evolution of galaxies throughout cosmic time. The technique of reverberation mapping uses the time variability of active galactic nuclei (AGNs) to directly measure the masses of supermassive black holes in galaxy nuclei. The Southern Telescope AGN Reverberation Experiment (STARE) collaboration was founded to carry out spectroscopic monitoring of AGNs with the SMARTS 1.5m telescope at CTIO and photometric monitoring through a worldwide network of telescopes. The first STARE campaign is monitoring four AGNs from August through November 2011, and another campaign is planned for spring 2012. The monitoring datasets we are acquiring will allow us to track the continuum fluctuations and the detailed response of the broad emission lines, enabling us to directly test the consistency of black hole mass measurements derived from complementary techniques and to probe the detailed geometry and kinematics of the photoionized gas on scales 0.01 pc from each central black hole. I will discuss initial results from the 2011 STARE campaign.

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