Astronomy Reports最新文献

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

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-05-16 DOI: 10.1134/S1063772925701549

M. A. Bugaev, I. D. Novikov, S. V. Repin, P. S. Samorodskaya, I. D. Novikov Jr.

引用次数: 0

Apsidal Motion and Physical Parameters of V361 Cam V361凸轮侧向运动及物理参数

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-05-16 DOI: 10.1134/S1063772925701550

I. M. Volkov, S. A. Naroenkov, A. S. Volkova

{"title":"Apsidal Motion and Physical Parameters of V361 Cam","authors":"I. M. Volkov, S. A. Naroenkov, A. S. Volkova","doi":"10.1134/S1063772925701550","DOIUrl":"10.1134/S1063772925701550","url":null,"abstract":"Our multicolour photometric measurements of V361 Cam ((P{{ = 8.64}^{d}}), (V{{ = 10.79}^{m}}), (e = 0.12), B5 IV + B9 V) over the past 16 years, as well as TESS data, allowed us to determine for the first time the main physical characteristics of the system and measure the apsidal rotation velocity. The following physical parameters of the component stars were obtained: ({{T}_{1}} = 15{kern 1pt} {kern 1pt} 400 pm 300) K, ({{M}_{1}} = 6.0 pm 0.4{kern 1pt} {{M}_{ odot }}), R1 = 5.03 ± (0.05{kern 1pt} {{R}_{ odot }}), ({{T}_{2}} = 11{kern 1pt} {kern 1pt} 700 pm 250) K, ({{M}_{2}} = 2.8 pm 0.2{kern 1pt} {{M}_{ odot }}), ({{R}_{2}} = 1.94 pm 0.04{kern 1pt} {{R}_{ odot }}). The photometric parallax of 0.00035″ ± (0.000001^{''} ) matches the Gaia measurement of (0.00035^{''} pm 0.00003^{''} ). The apsidal rotation velocity is ({{dot {omega }}_{{{text{obs}}}}} = 0.024 pm 0.007)°/year, which is less than the theoretical value under the synchronism condition ({{dot {omega }}_{{{text{theor}}}}} = 0.056 pm 0.006)°/year. The age of the system, assuming solar chemical composition, is 70 Myr. Both components are pulsating (beta ) Cephei variables.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"69 2","pages":"118 - 134"},"PeriodicalIF":1.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073851","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 the Physical and Chemical Properties of Dense Clumps at Different Evolutionary Stages in Several Regions of Massive Star and Stellar Cluster Formation 大质量恒星和星团形成过程中不同演化阶段致密团块的物理化学性质研究

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-05-16 DOI: 10.1134/S1063772925701586

A. G. Pazukhin, I. I. Zinchenko, E. A. Trofimova

{"title":"Study of the Physical and Chemical Properties of Dense Clumps at Different Evolutionary Stages in Several Regions of Massive Star and Stellar Cluster Formation","authors":"A. G. Pazukhin, I. I. Zinchenko, E. A. Trofimova","doi":"10.1134/S1063772925701586","DOIUrl":"10.1134/S1063772925701586","url":null,"abstract":"Massive stars play an important role in the Universe. Unlike low-mass stars, the formation of these objects located at great distances is still unclear. It is expected to be governed by some combination of self-gravity, turbulence, and magnetic fields. Our aim is to study the chemical and physical conditions of dense clumps at different evolutionary stages. We performed observations towards 5 regions of massive star and stellar cluster formation (L1287, S187, S231, DR 21(OH), NGC 7538) with the IRAM-30m telescope. We covered the 2 and 3–4 mm wavelength bands and analyzed the lines of HCN, HNC, HCO+, HC3N, HNCO, OCS, CS, SiO, SO2, and SO. Using astrodendro algorithm on the 850 µm dust emission data from the SCUBA Legacy catalog, we determined the masses, H2 column densities, and sizes of the clumps. Furthermore, the kinetic temperatures, molecular abundances, and dynamical state were obtained. The Red Midcourse Space Experiment Source survey (RMS) was used to determine the clump types. A total of 20 clumps were identified. Three clumps were found to be associated with the H II regions, 10 with young stellar objects (YSOs), and 7 with submillimeter emission. The clumps have typical sizes of about 0.2 pc and masses ranging from 1 to 102({{M}_{ odot }}), kinetic temperatures ranging from 20 to 40 K and line widths of H13CO+ (1–0) approximately 2 km s–1. We found no significant correlation in the “line width–size” and the “line width–mass” relationships. However, a strong correlation is observed in “mass–size” relationships. The virial analysis indicated that three clumps are gravitationally bound. Furthermore, we suggested that significant magnetic fields of about 1 mG provide additional support for clump stability. The molecular abundances (relative to H2) are approximately 10–10–10–8.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"69 2","pages":"87 - 102"},"PeriodicalIF":1.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073782","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

Anisotropic Scattering of the Radio Emission in the Direction to Pulsar B1642–03 脉冲星 B1642-03 方向无线电发射的各向异性散射

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-04-02 DOI: 10.1134/S1063772925701513

M. V. Popov

引用次数: 0

Nonlinear Stability of the Triangular Equilibrium Points in the Photogravitational Restricted Three-Body Problem When the Primaries are Oblate Spheroids 当原初体为扁球体时，光引力受限三体问题中三角形平衡点的非线性稳定性

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-04-02 DOI: 10.1134/S1063772925701537

Shalini Suresh, Ram Krishan Sharma

{"title":"Nonlinear Stability of the Triangular Equilibrium Points in the Photogravitational Restricted Three-Body Problem When the Primaries are Oblate Spheroids","authors":"Shalini Suresh, Ram Krishan Sharma","doi":"10.1134/S1063772925701537","DOIUrl":"10.1134/S1063772925701537","url":null,"abstract":"This study considers the framework of a planar Restricted Three-Body Problem (RTBP) in which both the primaries are oblate spheroids with their equatorial planes coincident with the plane of motion while the more massive primary is a source of radiation. The nonlinear stability of the triangular equilibrium points is investigated with the help of the mean motion derived by Sharma et al. [15] which is more accurate than the one used in earlier works. The Lagrangian of a third infinitesimally small body when it is near either of the triangular equilibrium points L4/L5 is formulated with respect to a synodic coordinate frame located at the respective equilibrium point. From the second order part of the Lagrangian, extracted using Taylor series expansion, second order part of the Hamiltonian of the system is derived and the equations of motion of the third body near the equilibrium points are obtained. Analyzing the characteristic equation of the system, which is similar for both the equilibrium points L4/L5, critical mass value that marks the linear stability of the triangular equilibrium points is obtained. Furthermore, Moser’s conditions are employed to find the two exceptional values of the mass parameter in the stable range at which stability cannot be guaranteed. By comparing with the results available in the literature, all three critical mass values are found to be lower than the values obtained for an ideal RTBP framework without oblateness or photo-gravitational effect. In addition to that, critical mass values are also affected due to change in the mean motion expression.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"69 1","pages":"58 - 66"},"PeriodicalIF":1.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761684","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

Problems and Methods of Modern Search for Cosmic Strings 现代宇宙弦搜索的问题与方法

IF 1.1 4区物理与天体物理

Astronomy Reports Pub Date : 2025-04-02 DOI: 10.1134/S1063772925701501

O. S. Sazhina, I. I. Bulygin, O. Y. Solodilova

{"title":"Problems and Methods of Modern Search for Cosmic Strings","authors":"O. S. Sazhina, I. I. Bulygin, O. Y. Solodilova","doi":"10.1134/S1063772925701501","DOIUrl":"10.1134/S1063772925701501","url":null,"abstract":"In this paper, the theoretical and observational problems of the search for cosmic strings (CS) by methods of modern astrophysics are discussed and new possibilities for further observational search for CS are proposed and justified. In recent works by the authors, it was shown for the first time that taking into account the geometry of the CS (tilt and bend) cardinally affects one of the main observational methods of searching for CS: searching for chains of images of galaxies that should be formed due to the effect of gravitational lensing of background galaxies on the CS. Further, these theoretical developments were applied to the analysis of observational data of the double galaxy SDSS J110429.61+233150.3, previously found in the field of the assumed CS (CSc-1), identified, in turn, by the analysis of the CMB anisotropy. Based on these long-term studies, this paper for the first time identifies the fundamental problems of approximate theoretical models, within which the evolution of both CS networks and single CS is traditionally considered, and also for the first time justifies the rejection of the traditional search for extended chains of gravitational-lens pairs. In this paper, a new detailed strategy for searching for CS is proposed by identifying and analyzing the characteristic clustering of gravitationally lensed pairs. This strategy is demonstrated by the analysis of gravitationally lensed pairs in the CSc-1 region, and the requirements for future observations are indicated. Arguments are also given that admit a change in the linear density of CS in a wide range and that “heavy” CS do not contradict modern observational data, including that on the CMB anisotropy and the gravitational-wave background. A strategy for the systematic analysis of binary quasars (having a gravitationally lensed nature and an unidentified lensed object) as lensed on CS is discussed.","PeriodicalId":55440,"journal":{"name":"Astronomy Reports","volume":"69 1","pages":"14 - 27"},"PeriodicalIF":1.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761686","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