2019 год
| № | Название статьи | Авторы | Название журнала | Краткая аннотация | Ссылка |
| 1 | Effects of infall and outflow on massive star-forming regions | Li, Q., Zhou, J., Esimbek, J., Komesh, T., Sailanbek, S. |
Monthly Notices of the Royal Astronomical Society Q1 in Space and Planetary Science |
A total of 188 high-mass outflows have been identified from a sample of 694 clumps from the Millimetre Astronomy Legacy Team 90 GHz survey, representing a detection rate of approximately 27 per cent. The detection rate of outflows increases from the proto-stellar stage to the H II stage, but decreases again at the photodissociation (PDR) stage suggesting that outflows are being switched off during the PDR stage. An intimate relationship is found between outflow action and the presence of masers, and water masers appear together with 6.7 GHz methanol masers. Comparing the infall detection rate of clumps with and without outflows, we find that outflow candidates have a lower infall detection rate. Finally, we find that outflow action has some influence on the local environment and the clump itself, and this influence decreases with increasing evolutionary time as the outflow action ceases. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85077226985&origin=resultslist&sort=plf-f |
| 2 | H 2 CO and H110α Observations toward the Aquila Molecular Cloud | Komesh, T., Esimbek, J., Baan, W., ...Tang, X., Manapbayeva, A. |
Astrophysical Journal Q1 in Physics and Astronomy |
The formaldehyde H 2 CO(1 10 -1 11 ) absorption line and H110α radio recombination line have been observed toward the Aquila Molecular Cloud using the Nanshan 25 m telescope operated by the Xinjiang Astronomical Observatory CAS. These first observations of the H 2 CO (1 10 -1 11 ) absorption line determine the extent of the molecular regions that are affected by the ongoing star formation in the Aquila molecular complex and show some of the dynamic properties. The distribution of the excitation temperature T ex for H 2 CO identifies the two known star formation regions W40 and Serpens South as well as a smaller new region Serpens 3. The intensity and velocity distributions of H 2 CO and 13 CO(1-0) do not agree well with each other, which confirms that the H 2 CO absorption structure is mostly determined by the excitation of the molecules resulting from the star formation rather than by the availability of molecular material as represented by the distribution. Some velocity-coherent linear 13 CO(1-0) structures have been identified in velocity channel maps of H 2 CO and it is found that the three star formation regions lie on the intersect points of filaments. The H110α emission is found only at the location of the W40 H ii region and spectral profile indicates a redshifted spherical outflow structure in the outskirts of the H ii region. Sensitive mapping of H 2 CO absorption of the Aquila Complex has correctly identified the locations of star formation activity in complex molecular clouds and the spectral profiles reveal the dominant velocity components and may identify the presence of outflows. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85064443989&origin=resultslist&sort=plf-f |
| 3 | Parametric solutions of the Gylden–Meshchersky problem | Bekov, A.A., Momynov, S.B |
International Journal of Non-Linear Mechanics Q1 in Applied Mathematics
|
In this paper, we have obtained the parametric solutions of the Gylden–Meshchersky problem. The role of the τ(θ) parameter, which obeys the Martin–Chiara law, is played by the function of the angular characteristics of motion — the polar angle θ of the trajectory. The solutions found can be represented as an evolving ellipse with a variable parameter and eccentricity. The obtained solutions and the laws of μ(τ) are of interest for studying the evolution of binary systems and some applied problems in astronomy, which require to take into account the relation between the gravitational parameter μ(t), changing with time, and the angular characteristics of motion. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85068170636&origin=resultslist&sort=plf-f |
| 4 | Molecular environs and triggered star formation around the large Galactic infrared bubble N24 | Li, X., Esimbek, J., Zhou, J., ...Li, D., Alimbetova, D. Sailanbek, S |
Monthly Notices of the Royal Astronomical Society Q1 in Space and Planetary Science
|
A multi-wavelength analysis of the large Galactic infrared bubble N24 is presented in this paper in order to investigate the molecular and star-formation environment around expanding HII regions. Using archival data from Herschel and ATLASGAL, the distribution and physical properties of the dust over the entire bubble are studied. Using the Clumpfind2d algorithm, 23 dense clumps are identified, with sizes and masses in the range 0.65-1.73 pc and 600- 16 300 M⊙, respectively. To analyse the molecular environment in N24, observations of NH3 (1,1) and (2,2) were carried out using the Nanshan 26-m radio telescope. Analysis of the kinetic temperature and gravitational stability of these clumps suggests gravitational collapse in several of them. The mass-size distributions of the clumps and the presence of massive young protostars indicate that the shell of N24 is a region of ongoing massive-star formation. The compatibility of the dynamical and fragmentation timescales and the overabundance of young stellar objects and clumps on the rim suggest that the 'collect-and-collapse' mechanism is in play at the boundary of the bubble, but the existence of the infrared dark cloud at the edge of bubble indicates that a 'radiation-driven implosion' mechanism may also have played a role there. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85083984603&origin=resultslist&sort=plf-f |