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Название: | Giant molecular cloud scaling relations: The role of the cloud definition |
Авторы: | Khoperskov, S. A. Vasiliev, E. O. Ladeyschikov, D. A. Sobolev, A. M. Khoperskov, A. V. |
Дата публикации: | 2016 |
Издатель: | Oxford University Press |
Библиографическое описание: | Giant molecular cloud scaling relations: The role of the cloud definition / S. A. Khoperskov, E. O. Vasiliev, D. A. Ladeyschikov, A. M. Sobolev, et al. . — DOI 10.1093/mnras/stv2366 // Monthly Notices of the Royal Astronomical Society. — 2016. — Vol. 2. — Iss. 455. — P. 1782-1795. |
Аннотация: | We investigate the physical properties of molecular clouds in disc galaxies with different morphologies: a galaxy without prominent structure, a spiral barred galaxy and a galaxy with flocculent structure. Our N-body/hydrodynamical simulations take into account nonequilibrium H2 and CO chemical kinetics, self-gravity, star formation and feedback processes. For the simulated galaxies, the scaling relations of giant molecular clouds, or so-called Larson's relations, are studied for two types of cloud definition (or extraction method): the first is based on total column density position-position (PP) data sets and the second is indicated by the CO (1-0) line emission used in position-position-velocity (PPV) data. We find that the cloud populations obtained using both cloud extraction methods generally have similar physical parameters, except that for the CO data the mass spectrum of clouds has a tail with low-mass objects M∼103-104 M⊙. Owing toa varying column density threshold, the power-law indices in the scaling relations are significantly changed. In contrast, the relations are invariant to the CO brightness temperature threshold. Finally, we find that the mass spectra of clouds for PPV data are almost insensitive to the galactic morphology, whereas the spectra for PP data demonstrate significant variation. © 2015 The Authors. |
Ключевые слова: | GALAXIES: SPIRAL GALAXIES: STRUCTURE ISM: CLOUDS - ISM: MOLECULES ISM: STRUCTURE STARS: FORMATION |
URI: | http://elar.urfu.ru/handle/10995/90292 |
Условия доступа: | info:eu-repo/semantics/openAccess |
Идентификатор SCOPUS: | 84964745402 |
Идентификатор WOS: | 000368007100048 |
Идентификатор PURE: | 661001 |
ISSN: | 0035-8711 |
DOI: | 10.1093/mnras/stv2366 |
Сведения о поддержке: | Bauman Moscow State Technical University, Bauman MSTU Russian Science Foundation, RSF: 14-22-00041 Russian Foundation for Basic Research, RFBR: MK-4536.2015.2, 15-32-21062, 14-02-00604, 15-02-06204 Russian Academy of Sciences, RAS Ministero dellâ Istruzione, dellâ Università e della Ricerca, MIUR 14-50-00043 Ministry of Education and Science of the Russian Federation, Minobrnauka: 3.1781.2014/K, 15-52-45114, 15-02-08293, 2663 We thank our referee, Erik Rosolwski, kindly for thoughtful suggestions that greatly improved the quality of the article. We also thank Marco Lombardi for several stimulating discussions and for reading the early versions of the manuscript. The numerical simulations have been performed at the Research Computing Center (Moscow State University) under a Russian Science Foundation grant (14-22-00041) and Joint Supercomputer Center (Russian Academy of Sciences). This work was supported by RFBR grants (14-02-00604, 15-02-06204, 15-32-21062) and by a President of the RF grant (MK-4536.2015.2). SAK has been supported by a postdoctoral fellowship sponsored by the Italian MIUR. AMS has been supported by the Ministry of Education and Science of the Russian Federation within the framework of the research activities (project no. 3.1781.2014/K). This work was also supported by Act 211 Government of the Russian Federation, contract no 02.A03.21.0006. EOV is thankful to the Ministry of Education and Science of the Russian Federation (project 2663) and RFBR (projects 15-02-08293 and 15-52-45114). The thermochemical part was developed under support from the Russian Scientific Foundation (grant 14-50-00043). |
Карточка проекта РНФ: | 14-22-00041 |
Располагается в коллекциях: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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Файл | Описание | Размер | Формат | |
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10.1093-mnras-stv2366.pdf | 6,69 MB | Adobe PDF | Просмотреть/Открыть |
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