Zobrazeno 1 - 10
of 26
pro vyhledávání: '"D C Homan"'
Publikováno v:
The Astronomical Journal, Vol 167, Iss 1, p 11 (2023)
We propose the use of entropy, measured from the spatial and flux distribution of pixels in the residual image, as a potential diagnostic and stopping metric for the CLEAN algorithm. Despite its broad success as the standard deconvolution approach in
Externí odkaz:
https://doaj.org/article/ca1f9aa2690b4e81bf37cbe9a1f1345e
Autor:
M. L. Lister, D. C. Homan, K. I. Kellermann, Y. Y. Kovalev, A. B. Pushkarev, E. Ros, T. Savolainen
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 1, p 34 (2023)
Externí odkaz:
https://doaj.org/article/726e55888ded4d489bdb827208001e2b
Autor:
D I Zobnina, H D Aller, M F Aller, D C Homan, Y Y Kovalev, M L Lister, I N Pashchenko, A B Pushkarev, T Savolainen
Publikováno v:
Monthly Notices of the Royal Astronomical Society.
Using stacking of images obtained at different epochs, we studied the variability properties of linear polarization of active galactic nucleus (AGN) jets on parsec-scales. Our sample is drawn from the MOJAVE programme, and consists of 436 AGNs manife
Autor:
A B Pushkarev, H D Aller, M F Aller, D C Homan, Y Y Kovalev, M L Lister, I N Pashchenko, T Savolainen, D I Zobnina
We analysed the parsec-scale linear polarization properties of 436 active galactic nuclei (AGN) based on 15 GHz polarimetric Very Long Baseline Array (VLBA) observations. We present polarization and total intensity images averaged over at least five
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7050cf44c8c2172c79fca5fdde3dd754
https://aaltodoc.aalto.fi/handle/123456789/121476
https://aaltodoc.aalto.fi/handle/123456789/121476
Autor:
D. C. Homan, M. H. Cohen, T. Hovatta, K. I. Kellermann, Y. Y. Kovalev, M. L. Lister, A. V. Popkov, A. B. Pushkarev, E. Ros, T. Savolainen
We present multi-epoch, parsec-scale core brightness temperature observations of 447 AGN jets from the MOJAVE and 2cm Survey programs at 15 GHz from 1994 to 2019. The brightness temperature of each jet over time is characterized by its median value a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::90715a5b01f27a40cad6b35e526fa5e0
Autor:
M. L. Lister, D. C. Homan, K. I. Kellermann, Y. Y. Kovalev, A. B. Pushkarev, E. Ros, T. Savolainen
Publikováno v:
The Astrophysical Journal. 923:30
We have analyzed the parsec-scale jet kinematics of 447 bright radio-loud active active galactic nuclei (AGN), based on 15 GHz Very Long Baseline Array (VLBA) data obtained between 1994 August 31 and 2019 August 4. We present new total intensity and
Autor:
T. G. Arshakian, Matthew L. Lister, Alexander B. Pushkarev, J. L. Richards, Yuri Y. Kovalev, Maurice Cohen, D. C. Homan, Tuomas Savolainen, Eric Clausen-Brown, Talvikki Hovatta, David L. Meier
We study the kinematics of ridge lines on the pc-scale jet of the active galactic nucleus BL Lac. We show that the ridge lines display transverse patterns that move superluminally downstream, and that the moving patterns are analogous to waves on a w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5173f595e6c12098a5546e09cd14e413
http://arxiv.org/abs/1409.3599
http://arxiv.org/abs/1409.3599
Autor:
D. C. Homan, John F. C. Wardle
Publikováno v:
The Astronomical Journal. 118:1942-1962
We present five epochs of 15 GHz VLBA observations of 13 AGN. These observations were specially calibrated to detect parsec scale circular polarization and our calibration techniques are discussed and analyzed in detail. We obtained reliable detectio
Autor:
Matthias Kadler, K. I. Kellermann, J. A. Zensus, Eduardo Ros, Maurice Cohen, Matthew L. Lister, D. C. Homan, Hugh D. Aller, Margo F. Aller, Yuri Y. Kovalev, Tuomas Savolainen, R. C. Vermeulen
Publikováno v:
Department of Physics and Astronomy Faculty Publications
We present images from a long-term program (MOJAVE: Monitoring of Jets in active galactic nuclei (AGNs) with VLBA Experiments) to survey the structure and evolution of parsec-scale jet phenomena associated with bright radio-loud active galaxies in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b13613fc93180d9860d79df9922050e
https://resolver.caltech.edu/CaltechAUTHORS:20090413-090043138
https://resolver.caltech.edu/CaltechAUTHORS:20090413-090043138
Autor:
Eduardo Ros, D. C. Homan, Matthew L. Lister, Margo F. Aller, Ivan Agudo, Hugh D. Aller, J. A. Zensus, Matthias Kadler, Manel Perucho, K. I. Kellermann, Yuri Y. Kovalev
Publikováno v:
Department of Physics and Astronomy Faculty Publications
In 1996, a major radio flux-density outburst occured in the broad-line radio galaxy 3C111. It was followed by a particularly bright plasma ejection associated with a superluminal jet component, which has shaped the parsec-scale structure of 3C111 for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a26b1160c0023b76f84a81f8f3d3124