A Survey of High Mass Star Forming Regions in the Lines of Deuterated Molecules     

Trofimova  E. A.  Zinchenko  I. I.  Zemlyanukha  P. M.  Thomasson  M. 《Astronomy Reports》2020,64(3):244-258

Astronomy Reports - A survey of massive star forming regions in the lines of the lowest transitions of deuterated molecules DCN, DNC, DCO+, N2D+ in the 4 mm wavelength range was performed using the...  相似文献   

Regional atmospheric processes and dust pollution of the Mt. Belukha glacier     

N.S. Frolova  G.S. Zinchenko  T.S. Papina 《Geography and Natural Resources》2009,30(1):26-29

An analysis is made of the meteorological conditions and of the formation sources of solid particles (dust) which are visually recorded in the layers of the ice core sampled by the joint Russian-Swedish expedition in 2001 in the saddle of Mt. Belukha of the Altai mountain massif (Katunsky Range).  相似文献   

Chemical differentiation in regions of high-mass star formation – II. Molecular multiline and dust continuum studies of selected objects     

I. Zinchenko  P. Caselli  L. Pirogov 《Monthly notices of the Royal Astronomical Society》2009,395(4):2234-2247

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Bipolar molecular outflow in IRAS 17233-3606     

O. V. Antyufeyev  V. M. Shulga  I. I. Zinchenko 《Kinematics and Physics of Celestial Bodies》2016,32(6):276-282

The high-mass star-forming region IRAS 17333-3606 has been mapped in the ¹³CO (J = 2–1) and C¹⁸O (J = 2–1) lines in the submillimeter wavelength range using the APEX (Chile) radio telescope. The analysis of the low-velocity part of the molecular outflow has been carried out, and the main parameters of the outflow have been determined. We have used a novel approach for calculating parameters of the low-velocity part of bipolar molecular outflows in molecular clouds. The approach excludes the influence of the surrounding cloud on the parameters of the outflow. The mass of the low-velocity part is much greater than that of the high-velocity part of the molecular outflow, while their energies are comparable. The core of the young stellar object is significantly deformed by the impact of the bipolar outflow.  相似文献   

The Spatial–Kinematic Structure of the Region of Massive Star Formation S255N on Various Scales     

P. M. Zemlyanukha  I. I. Zinchenko  S. V. Salii  O. L. Ryabukhina  S.-Y. Liu 《Astronomy Reports》2018,62(5):326-345

The results of a detailed analysis of SMA, VLA, and IRAM observations of the region of massive star formation S255N in CO(2–1), N₂H⁺(3–2), NH₃(1, 1), C¹⁸O(2–1) and some other lines is presented. Combining interferometer and single-dish data has enabled a more detailed investigation of the gas kinematics in the moleclar core on various spatial scales. There are no signs of rotation or isotropic compression on the scale of the region as whole. The largest fragments of gas (≈0.3 pc) are located near the boundary of the regions of ionized hydrogen S255 and S257. Some smaller-scale fragments are associated with protostellar clumps. The kinetic temperatures of these fragments lie in the range 10–80 K. A circumstellar torus with inner radius R_in ≈ 8000 AU and outer radius R_out ≈ 12 000 AU has been detected around the clump SMA1. The rotation profile indicates the existence of a central object with mass ≈8.5/ sin²(i) M_⊙. SMA1 is resolved into two clumps, SMA1–NE and SMA1–SE, whose temperatures are≈150Kand≈25 K, respectively. To all appearances, the torus is involved in the accretion of surrounding gas onto the two protostellar clumps.  相似文献   

Physical properties of molecular clouds as functions of their Galactocentric distance from CS and C<Superscript>34</Superscript>S observations     

A. G. Kislyakov  I. I. Zinchenko  L. E. B. Johansson 《Astronomy Reports》2003,47(6):467-479

Twenty-eight CS molecular clouds toward HII regions with Galactocentric distances from ～ 4 to 20 kpc have been studied based on observations obtained in the J=2→1 lines of CS and C³⁴S on the 20-meter radio telescope of the Onsala Space Observatory (Sweden) in March 2001. All 28 clouds have been mapped with an angular resolution of ～40″. The peak intensity in the C³⁴S line has been measured for 20 objects. An LTE analysis has been performed and the parameters of the molecular cloud cores derived. The core sizes are d_A=0.3–4.8 pc, with a median value of ～1.6 pc. The mean hydrogen densities in the cloud cores are n_H2=3.5×10²–3.7 × 10⁴ cm^?3, with a median value of ～7.2×10³ cm^?3. The value of n_H2 ends to decrease with increasing Galactocentric distance of the cloud. The masses of most clouds are 10²?6×10³M_⊙, with the most probable value being M_CS～10³M_⊙. The data follow the dependence M_CS ∝d _A ^(2.4–3.2) . As a rule, the cloud masses are lower than the virial masses for M_CS<10³M_⊙.  相似文献   

Sources of Biological Aerosols in Winter Precipitation in the South of Western Siberia     

N. S. Malygina  G. S. Zinchenko  N. A. Ryabchinskaya  E. Yu. Mitrofanova 《Russian Meteorology and Hydrology》2018,43(4):264-270

The results of studying biological aerosols (pollen spectra) in precipitation registered in the south of Western Siberia in the winter of 2014/15 are presented. Pollen grains of birch (Betula sp.), willow (Salix sp.), pine (Pinus sp.), and poplar (Populus sp.) were identified in the three of 28 analyzed precipitation samples. The comprehensive analysis of synoptic conditions during precipitation, back trajectories of air masses calculated with the HYSPLIT model as well as the analysis of the Northern Hemisphere snow cover dynamics and the area of distribution of the identified taxa were carried out. The results allowed determining the Euro-Scandinavian region as the main source of pollen grains inflow with precipitation to the south of Western Siberia in March 2015.  相似文献   

Assessing Surface Water Quality Based on Indicator Zoobenthos Species   总被引：1，自引：0，他引：1  

Shitikov  V. K.  Zinchenko  T. D.  Golovatyuk  L. V. 《Water Resources》2004,31(3):323-332

Mathematical aspects of predicting water quality class based on data of hydrobiological analysis with the use of pattern recognition are considered. A series of calculations of indicator valences of zoobenthos was performed using saprobic analysis by the M. Zelinka–P. Marvan method based on the occurrence of aquatic animals in different types of water bodies. Models using nonlinear optimization methods for the recognition of water quality classes by zoobenthos are proposed. Detailed comparative analysis is made for the results obtained from the observational data on small rivers in the Samara region.  相似文献   

Disks and outflows in the S255IR area of high mass star formation from ALMA observations     

Igor Zinchenko  Sheng-Yuan Liu  Yu-Nung Su  Yuan Wang 《天文和天体物理学研究(英文版)》2018,(8)

We describe the general structure of the well known S255 IR high mass star forming region,as revealed by our recent ALMA observations. The data indicate a physical relation exists between the major clumps SMA1 and SMA2. The driving source of the extended high velocity, well collimated bipolar outflow, is not the most pronounced disk-like SMA1 clump harboring a 20 M_⊙young star(S255 NIRS3), as was assumed earlier. Apparently, it is the less evolved SMA2 clump, which drives the outflow and contains a compact rotating structure(probably a disk). At the same time, the SMA1 clump drives another outflow, with a larger opening angle. The molecular line data do not show an outflow from the SMA3 clump(NIRS1), which was suggested by IR studies of this region.  相似文献   

Study of the filamentary infrared dark cloud G192.76+00.10 in the S254–S258 OB complex     

Olga L.Ryabukhina  Igor I.Zinchenko  Manash R.Samal  Petr M.Zemlyanukha  Dmitry A.Ladeyschikov  ANDrej M.Sobolev  Christian Henkel  Devendra K.Ojha 《天文和天体物理学研究(英文版)》2018,(8)

We present results of a high resolution study of the filamentary infrared dark cloud G192.76+00.10 in the S254-S258 OB complex in several molecular species tracing different physical conditions. These include three isotopologues of carbon monoxide(CO), ammonia(NH3) and carbon monosulfide(CS). The aim of this work is to study the general structure and kinematics of the filamentary cloud, and its fragmentation and physical parameters. The gas temperature is derived from the NH3(J, K) =(1,1),(2, 2) and ~(12)CO(2-1) lines, and the ~(13)CO(1-0), ~(13)CO(2-1) emission is used to investigate the overall gas distribution and kinematics. Several dense clumps are identified from the CS(2-1)data. Values of the gas temperature lie in the range 10-35 K, and column density N(H2) reaches the value 5.1 x 10~(22) cm~(-2). The width of the filament is of order 1 pc. The masses of the dense clumps range from ～ 30 M_☉ to ～ 160 M_☉. They appear to be gravitationally unstable. The molecular emission shows a gas dynamical coherence along the filament. The velocity pattern may indicate longitudinal collapse.  相似文献