Gallo, Luigi C.; Gruberbauer, Michael; Grupe, Dirk; Komossa, S.; Longinotti, Anna Lia; Fabian, Andrew C.; Pradhan, Anil K.; Xu, Dawei (American Astronomical Society, 2012-04)
The narrow-line Seyfert 1 galaxy (NLS1) Mkn 335 is remarkable because it has repeatedly shown deep, long X-ray low states that show pronounced spectral structure. It has become one of the prototype active galactic nuclei ...