First Spitzer Detection Of Dust Reverberation At 3.6 Microns In The Seyfert 1 Galaxy Zw 229-015

Details First Spitzer Detection Of Dust Reverberation At 3.6 Microns In The Seyfert 1 Galaxy Zw 229-015 First Spitzer Detection Of Dust Reverberation At 3.6 Microns In The Seyfert 1 Galaxy Zw 229-015

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915413g&link_type=abstract

American Astronomical Society, AAS Meeting #219, #154.13

Astronomy and Astrophysics

Astronomy

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 have conducted a space based (Spitzer at 3.6 microns) and ground based (V band) monitoring campaign of the Seyfert 1 Zw229-015 and have detected optical/IR reverberation. The cross-correlation between the V-band and 3.6 micron light curves found a strong correlation with a lag of 15 days, indicating a mean radius of 15 light-days for the 3.6-micron dust emission region.

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