Abstract
| Original language | English |
|---|---|
| Journal | American Astronomical Society, AAS Meeting #233 |
| Volume | 233 |
| Publication status | Published - Jan 2019 |
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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
TY - JOUR
T1 - Dynamical Reconstruction of the Parsec-Scale Jet of the Blazar 3C 273 at 43 and 15 GHz
AU - Hunter, John M.
AU - Akiyama, Kazunori
AU - Johnson, Michael
AU - Fish, Vincent
AU - Jorstad, Svetlana
AU - Marscher, Alan
PY - 2019/1
Y1 - 2019/1
N2 - 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.
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.
M3 - Article
VL - 233
JO - American Astronomical Society, AAS Meeting #233
JF - American Astronomical Society, AAS Meeting #233
ER -