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Title:
X-ray Dips and Superluminal Ejections in the Radio Galaxy 3C 120
Authors:
Olmstead, Alice; Marscher, A. P.; Jorstad, S. G.; Chatterjee, R.; Aller, M. F.
Affiliation:
AA(Boston University), AB(Boston University), AC(Boston University), AD(Boston University), AE(University of Michigan)
Publication:
American Astronomical Society, AAS Meeting #212, #20.08; Bulletin of the American Astronomical Society, Vol. 40, p.218
Publication Date:
05/2008
Origin:
AAS
Bibliographic Code:
2008AAS...212.2008O

Abstract

Marscher et al. (2002, Nature, 417, 625) have previously reported four dips in the X-ray flux from the central engine of 3C 120 from 1997 to 1999, each followed by the appearance of a bright superluminal radio knot. In order to confirm and expand on this finding, we monitored the radio galaxy intensely with the VLBA and RXTE from March 2002 to May 2007. We identify `significant' superluminal knots by their strong flux and linear polarization. Discrete cross-correlation analysis reveals an

anti-correlation with a time delay of order 60 days (X-ray leading) between the radio and X-ray flux, as expected if new superluminal knots cause radio flares and are associated with X-ray dips. We also employ correlation studies to determine whether there is a connection between the `equivalent' width or depth of the dips and the flux or speed of the knots.

This paper is based on work supported by NSF grant AST-0406865 and several NASA grants.

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