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Molecular clouds as probes of Milky ...

Duval, Julia.

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Molecular clouds as probes of Milky Way structure and interstellar turbulence.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Molecular clouds as probes of Milky Way structure and interstellar turbulence./
作者:	Duval, Julia.
面頁冊數:	268 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: 6272.
Contained By:	Dissertation Abstracts International70-10B.
標題:	Physics, Astronomy and Astrophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3382572
ISBN:	9781109436112

Molecular clouds as probes of Milky Way structure and interstellar turbulence.
Duval, Julia.

Molecular clouds as probes of Milky Way structure and interstellar turbulence. - 268 p.

Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: 6272.

Thesis (Ph.D.)--Boston University, 2010.

The Galactic Ring Survey, a 13CO survey of the first quadrant of the Milky Way, is used to probe the spiral structure of the Galaxy and to constrain the formation and turbulent structure of molecular clouds.

ISBN: 9781109436112Subjects--Topical Terms:

1019521
Physics, Astronomy and Astrophysics.

Molecular clouds as probes of Milky Way structure and interstellar turbulence.
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245 1 0 $a Molecular clouds as probes of Milky Way structure and interstellar turbulence.
300 $a 268 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: 6272.
500 $a Adviser: James Jackson.
502 $a Thesis (Ph.D.)--Boston University, 2010.
520 $a The Galactic Ring Survey, a 13CO survey of the first quadrant of the Milky Way, is used to probe the spiral structure of the Galaxy and to constrain the formation and turbulent structure of molecular clouds.
520 $a A sample of 829 molecular clouds has been identified in the Galactic Ring Survey (GRS). Kinematic distances to 750 of these GRS clouds are derived. The Galactic surface mass density of molecular gas is subsequently computed from 13CO and 12CO emission detected in the GRS and the University of Massachusetts-Stony Brook surveys. The Galactic distribution of molecular clouds is strongly enhanced along the Scutum-Crux, Sagittarius, and Perseus arms. These molecular data are consistent with a four-arm model of the Galaxy, while the locations of the Scutum-Crux and Perseus arms are consistent with the distribution of the old stellar population inferred from infrared maps.
520 $a Physical properties of molecular clouds such as size, mass, and density, are also derived in order to compare clouds located inside and outside spiral arms, and to constrain formation models. Molecular clouds located inside inferred spiral arms are found to be more massive, to have higher surface mass densities, and to be more strongly gravitationally bound than inter-arm clouds. This supports cloud formation models involving spiral structure and suggests that molecular clouds must have lifetimes of a few million years.
520 $a The turbulent structure of molecular clouds is a fundamental component of star formation. The GRS is the first large scale, fully sampled 13CO survey of the Galaxy allowing the observation of the sub-parsec-scale structure of molecular clouds. Principal Component Analysis applied to both GRS clouds and numerical simulations allows the derivation of turbulent energy spectra over scales ranging from 0.1 pc to 50 pc. The slope of the energy spectrum, E(k), versus the wavenumber, k, obtained for the GRS clouds is consistent with compressible, intermittent turbulence. The slopes and amplitudes of the energy spectra of the clouds are fairly constant over three decades of masses, which indicates that turbulence is driven on large scales by an external, Galactic pool of kinetic energy.
590 $a School code: 0017.
650 4 $a Physics, Astronomy and Astrophysics. $3 1019521
690 $a 0606
710 2 $a Boston University. $3 1017454
773 0 $t Dissertation Abstracts International $g 70-10B.
790 1 0 $a Jackson, James, $e advisor
790 $a 0017
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3382572