AAS 205th Meeting, 9-13 January 2005
Session 27 Active Galactic Nuclei
Poster, Monday, January 10, 2005, 9:20am-6:30pm, Exhibit Hall

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[27.08] Where is the active nucleus in the radio galaxy 2021+614?

N. Mellott, M. Lister (Purdue University)

The nearly elliptical galaxy 2021+614 (z=0.2266) harbors an unusually powerful radio source having an overall spectrum peaked at approximately 4 GHz. Its radio structure is very compact (< 30 pc) and has a morphology similar to jetted outflows seen in young active galaxies. We have analyzed space and ground Very Long Baseline Interferometry (VLBI) data on this source taken with the VLBA, Effelsberg, and the HALCA satellite at 1.6, 2.2, 5, 8, 15, and 22 GHz in order to characterize its jet kinematics and determine the location of the central engine. In contrast to previously reported findings at 5 GHz, we do not detect any increase in separation of the outermost jet features in this source over a baseline of 9 years at 15 GHz. However, we find evidence for proper motion within the southern jet feature. At the same location there is a region of highly inverted spectral index whose flux density changes significantly over time. We discuss the likelihood of this feature being caused by a foreground absorbing cloud, and whether it represents the site of the active nucleus in this radio source. This work is supported in part by NSF grant AST-0406923.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.