Magnetic Field Structure of Dense Cores Using Spectroscopic Methods

被引：11

作者：

Auddy, Sayantan ^{[1
,2
]}

Myers, Philip C. ^{[1
]}

Basu, Shantanu ^{[2
]}

Harju, Jorma ^{[3
,4
]}

Pineda, Jaime E. ^{[3
]}

Friesen, Rachel K. ^{[5
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[2] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada

[3] Max Planck Inst Extraterr Phys MPE, Giessenbachstr 1, D-85748 Garching, Germany

[4] Univ Helsinki, Dept Phys, POB 64, FIN-00014 Helsinki, Finland

[5] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 872卷 / 02期

基金：

欧洲研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

ISM: clouds; ISM: magnetic fields; stars: formation; CONTRACTING GAS CLOUD; STAR-FORMATION; AMBIPOLAR DIFFUSION; MOLECULAR CLOUDS; INTERSTELLAR CLOUDS; DARK CLOUDS; NONHOMOLOGOUS CONTRACTION; INTERCLOUD MEDIUM; AMMONIA; FRAGMENTATION;

D O I：

10.3847/1538-4357/ab0086

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We develop a new "core field structure" (CFS) model to predict the magnetic field strength and magnetic field fluctuation profile of dense cores using gas kinematics. We use spatially resolved observations of the nonthermal velocity dispersion from the Green Bank Ammonia survey along with column density maps from SCUBA-2 to estimate the magnetic field strength across seven dense cores located in the L1688 region of Ophiuchus. The CFS model predicts the profile of the relative field fluctuation, which is related to the observable dispersion in the direction of the polarization vectors. Within the context of our model, we find that all of the cores have a transcritical mass-to-flux ratio.

引用

页数：13

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