Spitzer, Kepler, and Ground Based Reverberation Mapping of 3 Active Galactic Nuclei

Details Spitzer, Kepler, and Ground Based Reverberation Mapping of 3 Active Galactic Nuclei Spitzer, Kepler, and Ground Based Reverberation Mapping of 3 Active Galactic Nuclei

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70119g&link_type=abstract

Spitzer Proposal ID #70119

Computer Science

Scientific paper

Near-infrared reverberation measurements have proven to be a valuable tool for mapping the location of hot dust in active galactic nuclei (AGNs). Ground-based campaigns have shown that the K-band continuum varies in response to changes in the optical continuum, and measurements of the K-band lag time give the size scale of the hot dust emission region, which likely corresponds to the dust sublimation radius. Reverberation measurements at longer wavelengths can add valuable information on the dust temperature profile in AGNs and the structure of the putative dusty torus, but there have not previously been any definitive measurements of dust reverberation at wavelengths longer than the K band. We propose to conduct a campaign of high-cadence monitoring observations (1 observation per 72 hours) of three bright, low-redshift AGNs in order to detect 3.6 micron variability and to measure the reverberation lag time of the 3.6 micron continuum relative to the optical continuum. This will be accomplished at the previously unprecedented photometric accuracy of 1%. Our sample includes two well-studied and highly variable AGNs, NGC 4051 and Mrk 817. Our third target, the Seyfert 1 galaxy Zw 229-015, is a Kepler monitoring target for Kepler Cycle 2, making it a key target for coordinated, multiwavelength monitoring over the coming year. We will obtain ground-based optical (V-band) and near-IR (JHK) monitoring data for these AGNs in order to compare the near-IR and 3.6 micron variability with the optical light curves, providing unique new constraints on the dust temperature profiles in these AGNs.

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