Astronomy Reports最新文献_第6页

The Effects of Various Perturbations on the Motion of Test Particle in the CR3BP 各种扰动对CR3BP中测试粒子运动的影响

IF 0.7 4区物理与天体物理

Astronomy Reports Pub Date : 2025-06-11 DOI: 10.1134/S1063772925701616

Abdullah

引用次数: 0

Orion Nebula Cluster (ONC) and Planetary Systems from Gaia DR3 and JWST Data 来自盖亚DR3和JWST数据的猎户座星云集群（ONC）和行星系统

IF 0.7 4区物理与天体物理

Astronomy Reports Pub Date : 2025-06-11 DOI: 10.1134/S106377292570163X

S. V. Vereshchagin, D. I. Tagaev, T. Bugra Keskin, N. V. Chupina, E. S. Postnikova

引用次数: 0

Second Degree Local Integral for Rotating Systems. Part I 旋转系统的二阶局部积分。第一部分

IF 0.7 4区物理与天体物理

Astronomy Reports Pub Date : 2025-06-11 DOI: 10.1134/S1063772925701690

F. T. Shamshiev

引用次数: 0

On the Instabilities of Small-Scale Modes of Oscillations Against the Background of a Collapsing Galaxy Model 坍缩星系模型背景下小尺度振荡模态的不稳定性

IF 0.7 4区物理与天体物理

Astronomy Reports Pub Date : 2025-06-11 DOI: 10.1134/S1063772925701665

S. N. Nuritdinov, J. M. Ganiev, K. T. Mirtadjieva

{"title":"On the Instabilities of Small-Scale Modes of Oscillations Against the Background of a Collapsing Galaxy Model","authors":"S. N. Nuritdinov, J. M. Ganiev, K. T. Mirtadjieva","doi":"10.1134/S1063772925701665","DOIUrl":"10.1134/S1063772925701665","url":null,"abstract":"In this work, the gravitational instability of small-scale perturbations with an azimuthal wave number (m = 2) in disk-like self-gravitating systems is considered. Calculations of horizontal small-scale oscillation modes ((m;N) = (2;10)) and (2; 20) against the background of a nonlinearly non-equilibrium anisotropic model of a self-gravitating disk are performed. Critical diagrams of the relationship between the virial parameter and the degree of rotation for these modes are constructed, and the increments of instability for different values of the rotation parameter are calculated. The results show that the instability for the oscillation mode (2; 10) begins at a virial parameter value of ({{(2T{text{/}}left| U right|{kern 1pt} )}_{0}} approx 0.217) at (Omega = 0) and reaches 0.413 at (Omega = 1). For the oscillation mode (2; 20), the instability starts at a virial parameter value of ({{(2T{text{/}}left| U right|{kern 1pt} )}_{0}} approx 0.128) at (Omega = 0) and reaches 0.146 at (Omega = 1). It is found that with an increase in the rotation parameter, the instability region also increases, while with an increase in the degree of small-scale structure, the instability region significantly decreases. The work is partially based on a talk presented at the Modern Stellar Astronomy 2024 conference.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"69 3","pages":"255 - 267"},"PeriodicalIF":0.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Behavior of Sectoral Instabilities Depending on the Parameters of the Generalized Model of a Self-Gravitating Disk 扇形不稳定性随自引力盘广义模型参数的行为

IF 0.7 4区物理与天体物理

Astronomy Reports Pub Date : 2025-06-11 DOI: 10.1134/S1063772925701641

K. T. Mirtadjieva, S. N. Nuritdinov

{"title":"Behavior of Sectoral Instabilities Depending on the Parameters of the Generalized Model of a Self-Gravitating Disk","authors":"K. T. Mirtadjieva, S. N. Nuritdinov","doi":"10.1134/S1063772925701641","DOIUrl":"10.1134/S1063772925701641","url":null,"abstract":"In this work, we investigate the problem of gravitational instability in a generalized model of a nonlinearly radially pulsating disk with an anisotropic velocity diagram relative to sectoral modes of perturbations. This model is a nonstationary generalization of the equilibrium self-gravitating disk by Bisnovatyi-Kogan and Zel’dovich. Exact expressions are obtained for the main physical characteristics of the generalized model, such as the components of the kinetic energy of the pulsating disk, velocity dispersions in the radial and transverse directions, the global anisotropy parameter, and others. We also found nonstationary analogs of dispersion equations (NADE) against the background of this generalized model for sectoral modes of perturbations. Based on the results of numerical calculations of NADE, graphs comparing the instability increments depending on the initial virial ratio of the system for various values of the parameters (alpha ) and (beta ), characterizing the difference and degree of anisotropy of nonlinearly nonstationary models of the self-gravitating disk, were constructed. In particular, it is shown that the development of bar-like mode instability will be the same for all anisotropic models, as the NADE of this mode does not depend on the parameters (alpha ) and (beta ). It is also established that the anisotropy parameters (alpha ) and (beta ) of the generalized model have opposite effects during the evolution of sectoral modes of perturbations. The work is partially based on a talk presented at the Modern Stellar Astronomy 2024 conference.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"69 3","pages":"169 - 175"},"PeriodicalIF":0.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radiointerferometric Observational Capabilities of Relativistic Jets in Active Galactic Nuclei for the “Millimetron” Project “毫米”计划中活动星系核中相对论喷流的辐射干涉观测能力

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-05-16 DOI: 10.1134/S1063772925701598

A. G. Rudnitskiy, M. A. Shchurov, E. V. Kravchenko, T. A. Syachina, P. R. Zapevalin

{"title":"Radiointerferometric Observational Capabilities of Relativistic Jets in Active Galactic Nuclei for the “Millimetron” Project","authors":"A. G. Rudnitskiy, M. A. Shchurov, E. V. Kravchenko, T. A. Syachina, P. R. Zapevalin","doi":"10.1134/S1063772925701598","DOIUrl":"10.1134/S1063772925701598","url":null,"abstract":"In this paper, observational capabilities of the Millimetron space-ground very long baseline interferometer mode for active galactic nuclei have been analyzed to obtain two dimensional images of these object with high angular resolution. The observatory with its 10-m mirror will conduct observations in the very long baseline radio interferometry mode together with ground telescopes in the frequency range of 43–345 GHz (the wavelength range of 7–0.7 mm). Due to the orbit in the vicinity of the L2 Lagrange point of the Sun–Earth system, the maximum angular resolution will be up to 0.8 (43 GHz), 0.4 (100 GHz), 0.14 (230 GHz), and 0.1 (345 GHz) μas. Obtaining images with high angular resolution both makes it possible to study the vicinity of nearby supermassive black holes and opens up new possibilities in studying the structure and dynamics of relativistic jets of active galactic nuclei and studying the core shift effect. Based on the previously calculated nominal orbit for the Millimetron observatory, the observational capabilities of 379 sources previously observed within the Radioastron mission scientific program have been analyzed. The fundamental capabilities of obtaining radio images of 13 sources with a specific possible time and duration of such observations have been demonstrated. The obtained results have broad practical significance in terms of further planning and development of the scientific program for the space-ground interferometer mode of the Millimetron observatory.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"69 2","pages":"77 - 86"},"PeriodicalIF":1.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of Maser and Thermal Molecular Emission in the Vicinity of Selected Protostellar Objects with the RT-22 Radio Telescope at PRAO PRAO RT-22射电望远镜对选定原恒星天体附近脉泽和热分子发射的研究

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-05-16 DOI: 10.1134/S1063772925701604

I. E. Val’tts

{"title":"Study of Maser and Thermal Molecular Emission in the Vicinity of Selected Protostellar Objects with the RT-22 Radio Telescope at PRAO","authors":"I. E. Val’tts","doi":"10.1134/S1063772925701604","DOIUrl":"10.1134/S1063772925701604","url":null,"abstract":"At the early stage of the protostar evolution, gas is mostly in the molecular form, while the process of protostars development causes a variety of surrounding matter emission in molecular lines at many frequencies of any ranges. This work is aimed at measuring the parameters of molecular radio lines in the vicinity of some young protostellar objects to expand our understanding of their evolutionary trends. Observations have been carried out with the RT-22 radio telescope at the Pushchino Radio Astronomical Observatory, Lebedev Physical Institute from July 2022 until May 2023. Two standard transistor receivers, which operated at frequencies of 20–24 GHz (13.5-mm range) and 36.2–37.7 GHz (8-mm range), have been used. Emission in the lines of four molecules, each one being a “tracer” of the environmental physical state: water (({{{text{H}}}_{{text{2}}}}{text{O}})), methanol (({text{C}}{{{text{H}}}_{{text{3}}}}{text{OH}})), ammonia (({text{N}}{{{text{H}}}_{{text{3}}}})), and cyanoacetylene (({text{H}}{{{text{C}}}_{{text{3}}}}{text{N}})) has been studied. Observational results for three IRDC objects, for two CORE-type objects, and for the star forming region Onsala-1 have been obtained. Radio emission in the water vapor line has been detected in all studied objects, except for IRDC G027.94–00.47. For three objects: IRDC G028.37+0.07b, IRDC G024.33+0011, and Onsala-1, the rotational and kinetic temperatures in the radiation region have been determined from the emission spectra of the ammonia molecule, and the concentration of ammonia and the density of molecular hydrogen have been estimated. Emission in lines of cyanoacetylene in the direction of to sources IRDC G028.37+0.07b, and Onsala-1 has been detected, and the column density of this molecule has been determined.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"69 2","pages":"103 - 117"},"PeriodicalIF":1.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Ambient Conditions and Dust Parameters on the Thermal Desorption Rate of Ice Mantle 环境条件和粉尘参数对冰幔热解吸速率的影响

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-05-16 DOI: 10.1134/S1063772925701574

M. S. Murga, E. E. Sivkova, A. I. Vasyunin

引用次数: 0

Variation of Global and Local Flows in the Solar Convection Zone during Activity Cycles 24 and 25 活动周期24和25期间太阳对流区全球和局部气流的变化

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-05-16 DOI: 10.1134/S1063772925701562

A. V. Getling, A. G. Kosovichev

引用次数: 0

Observing of Background Electromagnetic Radiation of the Real Sky through the Throat of a Wormhole 通过虫洞喉部观测真实天空的背景电磁辐射