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Published October 10, 2014 | Published
Journal Article Open

The Extreme Behavior of the Radio-loud Narrow-line Seyfert 1 Galaxy J0849+5108


Simultaneous radio, optical (both photometry and polarimetry), X-ray, and γ-ray observations of the radio-loud narrow-line Seyfert 1 (RL-NLSy1) galaxy J0849+5108 are presented. A massive three-magnitude optical flare across five nights in 2013 April is detected, along with associated flux increases in the γ-ray, infrared, and radio regimes; no comparable event was detected in the X-rays, though this may be due to poor coverage. A spectral energy distribution (SED) for the object using quasi-simultaneous data centered on the optical flare is compared to the previously published SEDs for the object by D'Ammando et al. The flare event coincided with a high degree of optical polarization. High amplitude optical microvariability is clearly detected, and is found to be of comparable amplitude when the object is observed in both faint and bright states. The object is also seen to undergo rapid shifts in polarization in both degree and electric vector position angle within a single night. J0849+5108 appears to show even more extreme variability than that previously reported for the similar object J0948+0022. These observations appear to support the growing claim that some RL-NLSy1 galaxies constitute a sub-class of blazar-like active galactic nuclei.

Additional Information

© 2014 The American Astronomical Society. Received 2013 September 18; accepted 2014 August 18; published 2014 September 25. The authors acknowledge the staff at Lowell Observatory for the hard work and support that made this research possible. We also thank Svetlana Jorstad of the Institute for Astrophysical Research at Boston University for her helpful commentary and observations. This work was funded by the PEGA RPE grant at Georgia State University.

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August 22, 2023
October 18, 2023