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## Multi-frequency synthesis technique based on maximum entropy method. On the importance of correction of the frequency-dependent VLBI core position shift

Transactions of IAA RAS, issue 24, 265–270 (2012)

A. T. Bajkova, A. B. Pushkarev . Multi-frequency synthesis technique based on maximum entropy method. On the importance of correction of the frequency-dependent VLBI core position shift // Transactions of IAA RAS. — 2012. — Issue 24. — P. 265–270. @article{bajkova2012, abstract = {We propose the multifrequency synthesis (MFS) algorithm with the spectral correction offrequency-dependent source brightness distribution based on the maximum entropy method. In order to take into account the spectral terms of nth order in the Taylor expansion for the frequency-dependent brightness distribution, we use a generalized form of the maximum entropy method. This is suitable for the reconstruction of not only positive-definite functions, but also sign-variable functions. With the proposed algorithm, we aim to produce both an improved total intensity image and a two-dimensional spectral index distribution over the source. We also consider the problem of the frequency-dependent variation of the radiocore positions of self-absorbed active galactic nuclei, which should be taken into account in a correct MFS.}, author = {A.~T. Bajkova and A.~B. Pushkarev}, issue = {24}, journal = {Transactions of IAA RAS}, keyword = {radio source, radio brightness, multifrequency synthesis algorithm}, pages = {265--270}, title = {Multi-frequency synthesis technique based on maximum entropy method. On the importance of correction of the frequency-dependent VLBI core position shift}, url = {http://iaaras.ru/en/library/paper/863/}, year = {2012} } TY - JOUR TI - Multi-frequency synthesis technique based on maximum entropy method. On the importance of correction of the frequency-dependent VLBI core position shift AU - Bajkova, A. T. AU - Pushkarev, A. B. PY - 2012 T2 - Transactions of IAA RAS IS - 24 SP - 265 AB - We propose the multifrequency synthesis (MFS) algorithm with the spectral correction offrequency-dependent source brightness distribution based on the maximum entropy method. In order to take into account the spectral terms of nth order in the Taylor expansion for the frequency-dependent brightness distribution, we use a generalized form of the maximum entropy method. This is suitable for the reconstruction of not only positive-definite functions, but also sign-variable functions. With the proposed algorithm, we aim to produce both an improved total intensity image and a two-dimensional spectral index distribution over the source. We also consider the problem of the frequency-dependent variation of the radiocore positions of self-absorbed active galactic nuclei, which should be taken into account in a correct MFS. UR - http://iaaras.ru/en/library/paper/863/ ER -