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Open AccessArticle

Proper Motions of Jets on the Kiloparsec Scale: New Results with HST

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Department of Physics, University of Maryland, Baltimore County, Baltimore, MD 20742, USA
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Space Telescope Science Institute, Baltimore, MD 21218, USA
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Florida Institute of Technology, Melbourne, FL 32901, USA
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Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2017, 5(1), 8; https://doi.org/10.3390/galaxies5010008
Received: 13 September 2016 / Revised: 13 January 2017 / Accepted: 16 January 2017 / Published: 20 January 2017
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
The Hubble Space Telescope recently celebrated 25 years of operation. Some of the first images of extragalactic optical jets were taken by HST in the mid-1990s; with time baselines on the order of 20 years and state-of-the-art astrometry techniques, we are now able to reach accuracies in proper-motion measurements on the order of a tenth of a milliarcsecond per year. We present the results of a recent HST program to measure the kiloparsec-scale proper motions of eleven nearby optical jets with Hubble, the first sample of its kind. When paired with VLBI proper-motion measurements on the parsec scale, we are now able to map the full velocity profile of these jets from near the black hole to the final deceleration as they extend out into and beyond the host galaxy. We see convincing evidence that weak-flavor jets (i.e., FR Is) have a slowly increasing jet speed up to 100 pc from the core, where superluminal components are first seen. View Full-Text
Keywords: proper motions; extragalactic jets; Hubble Space Telescope proper motions; extragalactic jets; Hubble Space Telescope
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Meyer, E.T.; Sparks, W.B.; Georganopoulos, M.; Van der Marel, R.; Anderson, J.; Sohn, S.T.; Biretta, J.; Norman, C.; Chiaberge, M.; Perlman, E. Proper Motions of Jets on the Kiloparsec Scale: New Results with HST. Galaxies 2017, 5, 8.

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