title: ÐÐ¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ ÑÑÑÑÐºÑÑÑÑ ÐºÐ²Ð°Ð·Ð°ÑÐ¾Ð² Ð¿Ð¾ Ð´Ð°Ð½Ð½ÑÐ¼ Ð³ÐµÐ¾Ð´ÐµÐ·Ð¸ÑÐµÑÐºÐ¸Ñ Ð Ð¡ÐÐ-Ð½Ð°Ð±Ð»ÑÐ´ÐµÐ½Ð¸Ð¹
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Modeling the structure of quasars based on geodetic VLBI observations
Creators: name: Ð¡ÐµÑÐ±Ð¸Ð½, ÐÑÑÐµÐ½Ð¸Ð¹
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: ÐÐ²Ð°Ð·Ð°ÑÑ
ÑÑÑÑÐºÑÑÑÐ½Ð°Ñ Ð·Ð°Ð´ÐµÑÐ¶ÐºÐ°
Ð³ÑÑÐ¿Ð¿Ð¾Ð²Ð°Ñ Ð·Ð°Ð´ÐµÑÐ¶ÐºÐ°
ÐºÐ°ÑÑÑ ÑÐ°Ð´Ð¸Ð¾ÑÑÐºÐ¾ÑÑÐ¸
ÑÑÐ½ÐºÑÐ¸Ñ ÐÐ°ÑÑÑÐ°
Ð¾ÑÑÐ°ÑÐ¾ÑÐ½ÑÐµ Ð½ÐµÐ²ÑÐ·ÐºÐ¸
Ð¼ÐµÑÐ¾Ð´ Ð³ÑÐ°Ð´Ð¸ÐµÐ½ÑÐ½Ð¾Ð³Ð¾ ÑÐ¿ÑÑÐºÐ°
Ð¼ÐµÑÐ¾Ð´ ÐÐ¾Ð½ÑÐµ-ÐÐ°ÑÐ»Ð¾
structural delay
group delay
radio brightness maps
Gaussian function
residuals
gradient descent method
Monte Carlo method

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description: This work is devoted to the creation of an algorithm for modeling the structure of quasars. When solving many VLBI problems, a signal delay between two remote stations (group delay) is used. The group delay contains delays caused by various reasons, one of which is the structure of the quasar. Many of the quasars involved in ICRF have an extended structure [14], so the structural delay must be taken into account when processing VLBI observations. However, when modeling the structural delay, the problem of variability in the structure of quasars arises [6], which makes it difficult to use their radio brightness maps, since they were obtained for specific dates. The article [1] showed the possibility of using residual residuals obtained after adjusting geodetic VLBI observations to model the quasar structure, since systematic deviations in the dependences of these residuals on sidereal time are caused by the stable part of the quasar structure. The purpose of this work is to study the possibilities of modeling the structure of a quasar using residual residuals and without using radio brightness maps. In the course of the work, an algorithm for constructing a square model was created, combining the Monte Carlo and gradient fall methods with the DBSCAN clustering algorithm. The use of a model that reflects the stable part of the quasar structure makes it possible to reduce the error introduced by the structural delay into the desired parameters when ensuring the VLBI problem.