Dynamical Reconstruction of the Parsec-Scale Jet of the Blazar 3C 273 at 43 and 15 GHz

John M. Hunter, Kazunori Akiyama, Michael Johnson, Vincent Fish, Svetlana Jorstad, Alan Marscher

Research output

Abstract

The Event Horizon Telescope (EHT) uses very long baseline interferometry (VLBI) at 230 GHz to image regions near supermassive black holes in the centers of galaxies. Currently, this array is able to handle nearby sources, such as Sagittarius A* and M87, due to their large angular size and large black hole mass in the case of M87. However, we hope that the EHT will be able to handle a larger number of differing sources as more telescopes are added. New imaging techniques are being developed to exploit the full potential of the EHT's high angular resolution and also offer the promise of improving the image quality of lower-frequency VLBI data. In order to accomplish this, we are developing a pipeline in the sparse modeling imaging library (smili) that takes real Very Long Baseline Array (VLBA) data of the parsec-scale jet of the blazar 3C 273 at both 43 and 15 GHz and dynamically reconstructs the evolution of its jet over 10 and 22 years, respectively. We then conduct a wavelet-based decomposition and analysis of significant structural patterns in the jet by implementing a newly developed wavelet-based image structure evaluation (WISE) algorithm into smili. We find that our new pipeline is able to handle the changing patterns of intensity typical of blazars with accuracy and smoothness in frame-to-frame reconstruction. We also report a number of interesting findings concerning the behavior of knot generation, velocity and acceleration profiles of the jet, and lifetimes of these knots.
Original languageEnglish
JournalAmerican Astronomical Society, AAS Meeting #233
Volume233
Publication statusPublished - Jan 2019

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event horizon
telescopes
Very Long Baseline Array (VLBA)
blazars
very low frequencies
velocity distribution
galaxies
decomposition
life (durability)
evaluation

Cite this

Hunter, John M. ; Akiyama, Kazunori ; Johnson, Michael ; Fish, Vincent ; Jorstad, Svetlana ; Marscher, Alan. / Dynamical Reconstruction of the Parsec-Scale Jet of the Blazar 3C 273 at 43 and 15 GHz. In: American Astronomical Society, AAS Meeting #233. 2019 ; Vol. 233.
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abstract = "The Event Horizon Telescope (EHT) uses very long baseline interferometry (VLBI) at 230 GHz to image regions near supermassive black holes in the centers of galaxies. Currently, this array is able to handle nearby sources, such as Sagittarius A* and M87, due to their large angular size and large black hole mass in the case of M87. However, we hope that the EHT will be able to handle a larger number of differing sources as more telescopes are added. New imaging techniques are being developed to exploit the full potential of the EHT's high angular resolution and also offer the promise of improving the image quality of lower-frequency VLBI data. In order to accomplish this, we are developing a pipeline in the sparse modeling imaging library (smili) that takes real Very Long Baseline Array (VLBA) data of the parsec-scale jet of the blazar 3C 273 at both 43 and 15 GHz and dynamically reconstructs the evolution of its jet over 10 and 22 years, respectively. We then conduct a wavelet-based decomposition and analysis of significant structural patterns in the jet by implementing a newly developed wavelet-based image structure evaluation (WISE) algorithm into smili. We find that our new pipeline is able to handle the changing patterns of intensity typical of blazars with accuracy and smoothness in frame-to-frame reconstruction. We also report a number of interesting findings concerning the behavior of knot generation, velocity and acceleration profiles of the jet, and lifetimes of these knots.",
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Dynamical Reconstruction of the Parsec-Scale Jet of the Blazar 3C 273 at 43 and 15 GHz. / Hunter, John M.; Akiyama, Kazunori; Johnson, Michael; Fish, Vincent; Jorstad, Svetlana; Marscher, Alan.

In: American Astronomical Society, AAS Meeting #233, Vol. 233, 01.2019.

Research output

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AU - Akiyama, Kazunori

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AU - Marscher, Alan

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AB - The Event Horizon Telescope (EHT) uses very long baseline interferometry (VLBI) at 230 GHz to image regions near supermassive black holes in the centers of galaxies. Currently, this array is able to handle nearby sources, such as Sagittarius A* and M87, due to their large angular size and large black hole mass in the case of M87. However, we hope that the EHT will be able to handle a larger number of differing sources as more telescopes are added. New imaging techniques are being developed to exploit the full potential of the EHT's high angular resolution and also offer the promise of improving the image quality of lower-frequency VLBI data. In order to accomplish this, we are developing a pipeline in the sparse modeling imaging library (smili) that takes real Very Long Baseline Array (VLBA) data of the parsec-scale jet of the blazar 3C 273 at both 43 and 15 GHz and dynamically reconstructs the evolution of its jet over 10 and 22 years, respectively. We then conduct a wavelet-based decomposition and analysis of significant structural patterns in the jet by implementing a newly developed wavelet-based image structure evaluation (WISE) algorithm into smili. We find that our new pipeline is able to handle the changing patterns of intensity typical of blazars with accuracy and smoothness in frame-to-frame reconstruction. We also report a number of interesting findings concerning the behavior of knot generation, velocity and acceleration profiles of the jet, and lifetimes of these knots.

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