(Proposal ID) S10A-018

(PI) Trump, Jonathan

(Proposal Title)
Optically Dull AGN: Obscured, Diluted, or Radiatively Inefficient?

(Abstract)
We propose spectropolarimetry of three optically dull AGN, which have the 
bright X-ray emission of an AGN but lack broad or narrow optical emission 
lines. The observations described here would be sensitive to a 0.1% polarized 
component, allowing us to directly detect or place limits on the importance of 
obscuration in the lack of emission lines. Optical dullness in AGN may also be 
caused by dilution or radiatively inefficient accretion, and spectropolarimetry
 allows us to directly distinguish these causes from obscuration. The three AGN
 we propose to observe already have deep multiwavelength observations from our 
previous work, making them perfect for additional spectropolarimetry.