Deconstructing infrared emission in Active Galaxies using FORCAST and HAWC+

Thursday, December 12, 2019 - 3:00pm PST
Lindsay Fuller
N232 R122
Event Type: 

Dust and gas play key roles in obscuration and supplying the supermassive black holes (SMBH) in active galactic nuclei (AGN).  Nuclear observations of AGN have historically attributed mid-IR emission primarily to an obscuring parsec-scale dust torus coplanar to the equatorial accretion disk.  However, recent studies have found that a majority (>50%) of nuclear MIR emission is due to an extended radiation-driven dusty wind in the polar region of some nuclei, possibly extending out to hundred-parsec scales.  An additional source of MIR emission on this scale is due to star formation.  With 31.5 and 37.1 μm FORCAST photometry, we have isolated torus emission and combined this data with 1 -18 μm observations from literature to construct spectral energy distributions (SEDs) of the torus for a sample of AGN.  We have also characterized the non-torus emission for a subset of our sample.  The addition of HAWC+ 53 – 214 μm data to the SEDs at longer wavelengths requires an improved methodology in torus isolation.  I aim to understand the nature of the extended emission due to dusty wind and star formation on hundred-parsec scales so that we can accurately describe the components of IR emission in AGN. 

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