Astronomy Reports

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Searching for Observational Evidence for Binary Star Systems in Gamma-ray Bursts
Astronomy Reports - Tập 65 Số 10 - Trang 973-975 - 2021
Liang Li
A Study of Variability of the Stokes Parameters and the Magnetic Field of G43.8–0.1 in the OH Line 1665 MHz
Astronomy Reports - Tập 67 - Trang 230-243 - 2023
N. T. Ashimbaeva, E. E. Lekht, V. V. Krasnov, A. M. Tolmachev
We present results of the study of maser emission variability in the 1665 MHz OH line in the G43.8–0.1 star formation region based on observations (monitoring) in 2008–2022 at the Large Radio Telescope in Nancy (France). Variability of all polarization parameters of the majority of spectral features, which has a monotonic regular character, has been found. Spatial identification of the main spectr...... hiện toàn bộ
Cosmological tests based on the abundance of galaxy clusters
Astronomy Reports - Tập 52 - Trang 607-615 - 2008
A. M. Malinovsky, V. N. Lukash, E. V. Mikheeva
We present a new normalization for the linear density-perturbation spectrum in a multi-parameter model of the Universe. Using the differential mass function for the nearly galaxy clusters obtained from optical data, we have constructed a functional relation between the dispersion of the density contrast σ 8 on the scale 8h −1 Mpc and the cosmological...... hiện toàn bộ
Evolution of Powerful H2O Maser Flares in the Active Star Formation Region W51
Astronomy Reports - Tập 66 - Trang 1267-1275 - 2023
N. T. Ashimbaeva, E. E. Lekht, V. V. Krasnov, A. M. Tolmachev
Results of a study of powerful H2O maser flares in the W51 region from observations (monitoring) in 2009–2022 with the 22-m radio telescope in the Pushchino Radio Astronomy Observatory are presented. Three powerful maser flares were detected at radial velocities of 69.7, 61.6, and 59.0 km/s with flux densities at peaks of 23.1, 29.4, and 66.1 kJy, respectively. The first and third of them are iden...... hiện toàn bộ
Do low surface brightness galaxies have dense disks?
Astronomy Reports - Tập 55 - Trang 409-415 - 2011
A. S. Saburova
The disk masses of four low-surface-brightness (LSB) galaxies are estimated using the criterion of marginal gravitational stability. The constructed mass models are close to those for a maximum disk. The results show that the disks of LSB galaxies may be significantly more massive than is usually believed based on their brightnesses. In this case, their surface densities and masses are fairly typi...... hiện toàn bộ
The Chemical Composition of Globular Clusters of Different Nature in Our Galaxy
Astronomy Reports - Tập 63 - Trang 274-288 - 2019
V. A. Marsakov, V. V. Koval’, M. L. Gozha
A catalog of Galactic globular clusters has been compiled and used to analyze relations between the chemical and kinematic parameters of the clusters. The catalog contains positions, distances, luminosities, metallicites, and horizontal-branch morphology indices for 157 globular clusters, as well as space velocities for 72 globular clusters. For 69 globular clusters, these data are suppleented wit...... hiện toàn bộ
Deviation of the arrival-time delay of pulses for the Crab pulsar from a quadratic frequency region
Astronomy Reports - - 2008
A. D. Kuz’min, B. Ya. Losovskiĭ, С. В. Логвиненко, I. I. Litvinov
Analysis of the Possibilities of Short-Term Prediction of Geomagnetic Perturbations from Observations of Coronal Mass Ejections at the BSA LPI Radio Telescope
Astronomy Reports - Tập 67 - Trang 607-617 - 2023
V. R. Lukmanov, I. V. Chashei, S. A. Tyul’bashev, I. A. Subaev
From April 2021 to October 2022, in the monitoring data obtained daily at the Big Scanning Antenna radio telescope (BSA LPI), 11 events were identified for which X-ray flares in the solar corona were followed by magnetic storms on Earth. Interplanetary scintillation monitoring data were considered together with data on solar flare activity and a simple kinematic model of ejection propagation. Base...... hiện toàn bộ
Detection of new pulsars at 111 MHz
Astronomy Reports - Tập 60 - Trang 220-232 - 2016
S. A. Tyul’bashev, V. S. Tyul’bashev, V. V. Oreshko, S. V. Logvinenko
The first results of a search for pulsars using the Large Phased Array of the Lebedev Physical Institute at 111 MHz for right ascensions 0h-24h and declinations 21°-42° are reported. Data with a time resolution of 100 ms in six frequency channels within a 2.5-MHz frequency band have been processed. Thirty-four pulsars have been detected, of which seventeen were observed on this telescope earlier; ...... hiện toàn bộ
Chandra X-ray galaxy clusters at z < 1.4: Constraints on the inner slope of the density profiles
Astronomy Reports - Tập 58 - Trang 587-610 - 2014
Yu. V. Babyk, A. Del Popolo, I. B. Vavilova
A reconstruction of the total mass (the fraction of dark matter, intercluster gas, and the brightest galaxy of the cluster) of 128 X-ray galaxy clusters at redshifts 0.01–1.4 based on Chandra observations is presented. The total mass M 200 and the baryonic mass M b have been measured for all the sample objects, as well as the conc...... hiện toàn bộ
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