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Record 17 of 22
X-ray Dips Followed by Superluminal Ejections as Evidence for An Accretion Disc Feeding the Jet in A Radio Galaxy
Offline Availability: Go to Request Form
Author and Affiliation:
Marscher, Alan P.(Boston Univ., Inst. for Astrophysical Research, Boston, MA United States)
Jorstad, Svetlana G.(Boston Univ., Inst. for Astrophysical Research, Boston, MA United States)
Gomez, Jose-Luis(Instituto de Astrofisica de Andalucia, Granada, Spain)
Aller, Margo F.(Michigan Univ., Astronomy Dept., Ann Arbor, MI United States)
Terasranta, Harri(Helsinki Univ. of Technology, Metsahovi Radio Observatory, Kylmaelae, Finland)
Lister, Matthew L.(National Radio Astronomy Observatory, Charlottesville, VA United States)
Stirling, Alastair, M.(University of Central Lancashire, Preston, Lancashire, United Kingdom)
Abstract: Accretion onto black holes is thought to power the relativistic jets and other high-energy phenomena in both active galactic nuclei (AGNs) and the "microquasar" binary systems located in our Galaxy. However, until now there has been insufficient multifrequency monitoring to establish a direct observational link between the black hole and the jet in an AGE. This contrasts with the case of microquasars, in which superluminal features appear and propagate down the radio jet shortly after sudden decreases in the X-ray flux. Such an X-ray dip is most likely caused by the disappearance of a section of the inner accretion disc, part of which falls past the event horizon and the remainder of which is injected into the jet. This infusion of energy generates a disturbance that propagates down the jet, creating the appearance of a superluminal bright spot. Here we report the results of three years of intensive monitoring of the X-ray and radio emission of the Seyfert-like radio galaxy 3C 120. As in the case of microquasars, dips in the X-ray emission are followed by ejections of bright superluminal knots in the radio jet. Comparison of the characteristic length and time scales allows us to infer that the rotational states of the black holes in these two objects are different.
Publication Date: Jan 01, 2002
Document ID:
20020040411
(Acquired Apr 26, 2002)
Subject Category: ASTROPHYSICS
Document Type: Preprint
Financial Sponsor: NASA Advisory Council Task Force on Issues of a Mixed Fleet; Unknown
National Science Foundation; United States
Michigan Univ.; Dept. of Astronomy; MI United States
Organization Source: Boston Univ.; Inst. for Astrophysical Research; Boston, MA United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: X RAYS; STELLAR MASS EJECTION; ACCRETION DISKS; RADIO EMISSION; RADIO GALAXIES; BLACK HOLES (ASTRONOMY); QUASARS
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