Institution
Astro Space Center
Facility•Moscow, Russia•
About: Astro Space Center is a facility organization based out in Moscow, Russia. It is known for research contribution in the topics: Maser & Pulsar. The organization has 80 authors who have published 73 publications receiving 1461 citations. The organization is also known as: Astro Space Center of PN Lebedev Physics Institute.
Papers published on a yearly basis
Papers
TL;DR: In this article, the authors presented λ3.5 cm and A6.2 cm radio continuum maps in total and polarized intensity of the barred galaxies NGC 1097 (at 2-15 resolution) and NGC 1365 (at 9-25 resolution).
Abstract: We present λ3.5 cm and A6.2 cm radio continuum maps in total and polarized intensity of the barred galaxies NGC 1097 (at 2-15 resolution) and NGC 1365 (at 9-25 resolution). A previously unknown radio galaxy southwest of NGC 1097 is reported. Apart from a smooth faint envelope and a bright central region, both galaxies exhibit radio ridges roughly overlapping with the massive dust lanes in the bar region. The contrast in total intensity across the radio ridges is compatible with compression and shear of an isotropic random magnetic field, where the gas density compression ratio is approximately equal to 4 and the cosmic ray density is constant across the ridges. The contrast in polarized intensity is significantly smaller than that expected from compression and shearing of the regular magnetic field: this could be the result of decoupling of the regular field from the dense molecular clouds. The regular field in the ridge is probably strong enough to reduce significantly shear in the diffuse gas (to which it is coupled) and hence to reduce magnetic field amplification by shearing. This contributes to the misalignment of the observed field orientation with respect to the velocity vectors of the dense gas. Our observations, for the first time, indicate that magnetic forces can control the flow of the diffuse inlerstellar gas at kilopursec scales. The total radio intensity reaches its maximum in the circumnuclear starburst regions, where the equipartition field strength is about 60μG, amongst the strongest fields detected in spiral galaxies so far. The regular field in the inner region has a spiral shape with large pitch angle, indicating the action of a dynamo. Magnetic stress leads to mass inflow towards the centre, sufficient to feed the active nucleus in NGC 1097. - We detected diffuse X-ray emission, possibly forming a halo of hot gas around NGC 1097.
203 citations
TL;DR: In this article, a southern hemisphere survey of methanol emission sources has been carried out using the ATNF Mopra millimetre telescope, where 85 sources, the majority of them masers, have been detected in the 8(0)-7(1)A+ transition of methenol at 95 GHz.
Abstract: A southern hemisphere survey of methanol emission sources has been carried out using the ATNF Mopra millimetre telescope. 85 sources, the majority of them masers, have been detected in the 8(0)-7(1)A+ transition of methanol at 95 GHz. Together with a similar northern hemisphere survey this completes the search for 95-GHz methanol emission from the Galactic Plane. The previously found correlation between intensity of methanol emission at 44 and 95 GHz is confirmed here with the larger sample of sources. The results of LVG statistical equilibrium calculations confirm the classification of these sources as class I methanol masers pumped through collisional excitation.
97 citations
TL;DR: In this paper, young bipolar outflows in regions of low-to-intermediate-mass star formation were observed in the 7_0-6_1A+, 8-0-7-1A+ and 5-1}-4_0E methanol lines at 44, 95, and 84 GHz, respectively.
Abstract: Six young bipolar outflows in regions of low-to-intermediate-mass star formation were observed in the 7_0-6_1A+, 8_0-7_1A+, and 5_{-1}-4_0E methanol lines at 44, 95, and 84 GHz, respectively. Narrow features were detected towards NGC 1333IRAS4A, HH 25MMS, and L1157 B1. Flux densities of the detected lines are no higher than 11 Jy, which is much lower than the flux densities of strong maser lines in regions of high-mass star formation. Analysis shows that most likely the narrow features are masers.
35 citations
TL;DR: The distribution of the polarization of the Cosmic Microwave Background (CMB) in the sky is determined by the hypothesis of random Gaussian distribution of primordial density perturbations as mentioned in this paper.
Abstract: The distribution of the polarization of the Cosmic Microwave Background (CMB) in the sky is determined by the hypothesis of random Gaussian distribution of the primordial density perturbations. This hypotheses is well motivated by the inflationary cosmology. Therefore, the test of consistency of the statistical properties of the CMB polarization field with the Gaussianity of primordial density fluctuations is a realistic way to study the nature of primordial inhomogeneities in the Universe. This paper contains the theoretical predictions of the general statistical properties of the CMB polarization field. All results obtained under assumption of the Gaussian nature of the signal. We pay the special attention to the following two problems. First, the classification and statistics of the singular points of the polarization field where polarization is equal to zero. Second, the topology of contours of the value of the degree of polarization. We have investigated the percolation properties for the zones of ``strong'' and ``weak'' polarization. We also have calculated Minkowski functionals for the CMB polarization field. All results are analytical.
21 citations
TL;DR: In this paper, the IBIS-ISGRI imager was used to obtain images of the galactic supernova remnant G78.2+2.1 (γ-Cygni) in hard X-ray energy bands from 25 keV to 120 keV.
Abstract: Spatially resolved images of the galactic supernova remnant G78.2+2.1 (γ-Cygni) in hard X-ray energy bands from 25 keV to 120 keV are obtained with the IBIS-ISGRI imager aboard the International Gamma-Ray Astrophysics Laboratory INTEGRAL. The images are dominated by localized clumps of about ten arcmin in size. The flux of the most prominent North- Western (NW) clump is (1.7 ± 0.4) × 10 −11 erg cm −2 s −1 in the 25-40 keV band. The observed X-ray fluxes are in agreement with extrapolations of soft X-ray imaging observations of γ-Cyg by ASCA GIS and spatially unresolved RXTE PCA data. The positions of the hard X-ray clumps correlate with bright patches of optical line emission, possibly indicating the presence of radiative shock waves in a shocked cloud. The observed spatial structure and spectra are consistent with model predictions of hard X-ray emission from nonthermal electrons accelerated by a radiative shock in a supernova interacting with an interstellar cloud, but the powerful stellar wind of the O9V star HD 193322 is a plausible candidate for the NW source as well.
20 citations
Authors
Showing all 90 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| Dmitry Novikov | 127 | 348 | 83093 |
| Yuri Y. Kovalev | 76 | 368 | 17885 |
| Denise C. Gabuzda | 36 | 228 | 4332 |
| Alexander F. Zakharov | 28 | 191 | 2621 |
| Sergei Kalenskii | 24 | 71 | 1811 |
| V. I. Slysh | 20 | 47 | 1260 |
| Igor Molotov | 20 | 122 | 1247 |
| I. E. Val'tts | 17 | 46 | 859 |
| Maxim Voronkov | 15 | 24 | 1091 |
| O. Doroshenko | 11 | 16 | 866 |
| Yuri Kovalev | 7 | 13 | 537 |
| V. A. Samodurov | 6 | 31 | 256 |
| A. M. Tolmachev | 6 | 28 | 100 |
| V. I. Slysh | 5 | 7 | 205 |
| M. A. Voronkov | 4 | 6 | 121 |
Related Institutes (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 4 |
| 2024 | 1 |
| 2023 | 5 |
| 2022 | 14 |
| 2021 | 1 |
| 2020 | 3 |