Cygnus A super-resolved via convex optimization from VLA data
Cygnus A super-resolved via convex optimization from VLA data
复制标题
Cygnus A 通过 VLA 数据的凸优化进行超解析
DOI:
10.1093/mnras/sty372
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发表时间:
2018
影响因子:
4.8
通讯作者:
Dabbech A
中科院分区:
文献类型:
--
作者:
Dabbech A
We leverage the Sparsity Averaging Re-weighted Analysis approach for interferometric imaging, that is based on convex optimization, for the super-resolution of Cyg A from observations at the frequencies 8.422 and 6.678 GHz with the Karl G. Jansky Very Large Array (VLA). The associated average sparsity and positivity priors enable image reconstruction beyond instrumental resolution. An adaptive Preconditioned primal-dual algorithmic structure is developed for imaging in the presence of unknown noise levels and calibration errors. We demonstrate the superior performance of the algorithm with respect to the conventionalclean-based methods, reflected in super-resolved images with high fidelity. The high-resolution features of the recovered images are validated by referring to maps of Cyg A at higher frequencies, more precisely 17.324 and 14.252 GHz. We also confirm the recent discovery of a radio transient in Cyg A, revealed in the recovered images of the investigated data sets. Ourmatlabcode is available online on GitHub.
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影响因子:
4.8
作者:
A. Repetti;J. Birdi;A. Dabbech;Y. Wiaux
通讯作者:
Y. Wiaux
影响因子:
4.8
作者:
L. Pratley;J. McEwen;Mayeul d'Avezac;R. Carrillo;Alexandru Onose;Y. Wiaux
通讯作者:
Y. Wiaux
影响因子:
4.8
作者:
A. Dabbech;L. Wolz;L. Pratley;J. McEwen;Y. Wiaux
通讯作者:
Y. Wiaux
DOI:
--
发表时间:
2017
期刊:
ArXiv e-prints
影响因子:
--
作者:
Onose Alexandru
通讯作者:
Onose Alexandru
DOI:
10.1086/170813
发表时间:
1991
期刊:
The Astrophysical Journal
影响因子:
--
作者:
C. Carilli;R. Perley;J. Dreher;J. Leahy
通讯作者:
J. Leahy