期刊
ASTROPHYSICAL JOURNAL
卷 776, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/776/1/62
关键词
gravitation; ISM: clouds; methods: analytical; stars: formation
资金
- NSF [AST-0807305, AST-1109085]
- Direct For Mathematical & Physical Scien [0807305] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0807305] Funding Source: National Science Foundation
Two aspects of the evolution of externally pressurized, hydrostatic filaments are discussed. (1) The free-fall accretion of gas onto such a filament will lead to filament parameters (specifically, FWHM-column-density relations) inconsistent with the observations of Arzoumanian et al., except for two cases: for low-mass, isothermal filaments, agreement is found as in the analysis by Fischera & Martin. Magnetized cases, for which the field scales weakly with the density as B proportional to n(1/2), also reproduce observed parameters. (2) Realistically, the filaments will be embedded not only in gas of non-zero pressure, but also of non-zero density. Thus, the appearance of sheet-embedded filaments is explored. Generating a grid of filament models and comparing the resulting column density ratios and profile shapes with observations suggests that the three-dimensional filament profiles are intrinsically flatter than isothermal, beyond projection and evolution effects.
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