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The Polarization Potential as a Probe into interstellar matter

Journal of Applied Mathematics and Physics 2021年第11期9卷 2623-2640页

作者： Amaury de Kertanguy LERMA Observatoire de Paris-Meudon Place Jules Janssen Meudon France

By simple arguments, it is shown how alkaline types of atoms can be seen in dense molecular clouds depending on the average temperature of such regions of the Universe. This paper predicts infrared lines of such atoms that could be seen in molecular clouds. The theory is developed in the first part and the predicted experimental results will follow. It results that the alkaline atoms modelized using the short-range polarization potential are found in quantum states n* > 2.

关键词： interstellar matter Alkaline Atoms Giant Molecular Clouds

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^(13)CO mapping study for massive molecular cloud cores

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Science China Mathematics 2001年第4期44卷 536-544页

作者：吴月芳阎慧荣王利明王均智雷成明吴京文孙金江 Astronomy Department CAS-PKU Joint Beijing Astrophysics Center Peking University Beijing China Qinghai Station Purple Mountain Observatory Chinese Academy of Sciences Delingha China

Using the newly installed SIS receiving system on the 13.7 m telescope at Qinghai Station of PMO, United Radio Astronomy of CAS, CO isotope 13 CO J=1-0 and C18 O J=1-0 lines were observed for thr ee sources S241, S39 and ON3. Results show that the three sources have massive cor es, of which the size is ～2-5 pc, masses are ～103-104 M⊙. The wid t hs of lines are also larger than those in low mass cores. And high velocity char acteristics were observed for all the sources. The V LSR distribution p resents rotation of the core in ON3. And all the three cores contain deeply embe dded forming massive stars. The young stellar objects in S241 and ON3 seem to be moving away from their birth sites.

关键词： interstellar matter molecular clouds interstellar dynamics star formation

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Diffuse matter and cosmogony of stellar systems in researches by ***

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Research in Astronomy and Astrophysics 2018年第8期18卷 89-96页

作者： Natalia Ivanovna Bondar Crimean Astrophysical Observatory RAS Nauchny298409Russia

The main topic of long-term researches by G.A. Shajn is the nature of diffuse matter, its dis- tribution in the Galaxy and extragalactic systems, interaction with the interstellar medium and hot stars, and the formation of emission and reflection nebulae and stars. Based on the analysis of experimental data, mainly photographic observations of nebulae in the Milky Way and extragalactic systems, he made conclusions and suggested well-founded hypotheses on a wide range of considered problems, including those related to cosmogony. The structure of nebulae, and their masses and sizes give reasons behind the conclusion that most of them are formed not in the process of ejection of matter from the stars, but rather they are objects which are born and evolve, and quite often are comprised of giant conglomerates of gas, dust and stars. The distribution of OB-type stars and nebulae in spiral branches points to their genetic relation and the fundamental role of the interstellar medium as the source of their formation. The structural features of nebulae are determined by the action of magnetohydrodynamic forces. Magnetic fields in a galaxy control the motion of diffuse gas-dust matter and ensure the maintenance of its spiral structure. These ideas continue being developed in modern directions of astrophysics.

关键词： galaxy interstellar matter diffuse nebulae cosmogony

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Massive molecular cloud cores and activities of star formation

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Chinese Physics B 2005年第4期14卷 863-868页

作者：周武飞吴月芳魏悦巨秉刚 AstronomyDepartment PekingUniversityBeijing100871China QinghaiStation PurpleMountainObservatoryDeLingHa.817000China

We have mapped 23 sources in the J=1-0 lines of 12CO, 13CO and C18O with the 13.7-m telescope at Qinghai station of Purple Mountain Observatory. The samples were chosen from the massive star formation regions whose single point lines have the broad-wing profile. The mapping shows that 12 clouds have cores and 5 outflows were identified with the 12CO J=1-0 lines. Among the 12 cores, systematic velocity shifts were found in 2 cores, and blue asymmetric double-peak profile of 12CO line was found in IRAS 19529+2704, indicating that it may be an infall candidate. Physical parameters of the cores and outflows were derived from the local thermodynamic equilibrium assumption. The masses range from ～ 9.4 × 102M⊙ to ～ 2.2 × 105M⊙. The hydrogen molecule densities range from ～ 3.4 × 102cm-3 to～ 1.2 × 104cm-3. The molecular outflows have masses larger than 3.5M⊙, and kinetic energies greater than 0.9× *** outflows have significantly greater masses and kinetic energies than those from low-mass young stellar objects(YSOs). For the cores, 2MASS data are available, dozens of 2MASS sources with different colour indices and brightness are often found around IRAS source, among which the reddest 2MASS source is always within the IRAS error ellipse thus probably corresponds to the IRAS source.

关键词： interstellar matter molecular cloud star formation

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