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Wang, Jia-Wei; Lai, Shih-Ping; Eswaraiah, Chakali; Pattle, Kate; Francesco, James Di; Johnstone, Doug; Koch, Patrick M.; Liu, Tie; Tamura, Motohide; Furuya, Ray S.; Onaka, Takashi; Ward-Thompson, Derek; Soam, Archana; Kim, Kee-Tae; Lee, Chang Won; Lee, Chin-Fei; Mairs, Steve; Arzoumanian, Doris; Kim, Gwanjeong; Hoang, Thiem; Hwang, Jihye; Liu, Sheng-Yuan; Berry, David; Bastien, Pierre; [...]

JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146

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  • Medientyp: E-Artikel
  • Titel: JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146
  • Beteiligte: Wang, Jia-Wei; Lai, Shih-Ping; Eswaraiah, Chakali; Pattle, Kate; Francesco, James Di; Johnstone, Doug; Koch, Patrick M.; Liu, Tie; Tamura, Motohide; Furuya, Ray S.; Onaka, Takashi; Ward-Thompson, Derek; Soam, Archana; Kim, Kee-Tae; Lee, Chang Won; Lee, Chin-Fei; Mairs, Steve; Arzoumanian, Doris; Kim, Gwanjeong; Hoang, Thiem; Hwang, Jihye; Liu, Sheng-Yuan; Berry, David; Bastien, Pierre; [...]
  • Erschienen: American Astronomical Society, 2019
  • Erschienen in: The Astrophysical Journal
  • Sprache: Nicht zu entscheiden
  • DOI: 10.3847/1538-4357/ab13a2
  • ISSN: 0004-637X; 1538-4357
  • Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:title>Abstract</jats:title> <jats:p>We present the 850 <jats:italic>μ</jats:italic>m polarization observations toward the IC 5146 filamentary cloud taken using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and its associated polarimeter (POL-2), mounted on the James Clerk Maxwell Telescope, as part of the <jats:italic>B</jats:italic>-fields In STar forming Regions Observations. This work is aimed at revealing the magnetic field morphology within a core-scale (≲1.0 pc) hub-filament structure (HFS) located at the end of a parsec-scale filament. To investigate whether the observed polarization traces the magnetic field in the HFS, we analyze the dependence between the observed polarization fraction and total intensity using a Bayesian approach with the polarization fraction described by the Rice likelihood function, which can correctly describe the probability density function of the observed polarization fraction for low signal-to-noise ratio data. We find a power-law dependence between the polarization fraction and total intensity with an index of 0.56 in <jats:italic>A</jats:italic> <jats:sub> <jats:italic>V</jats:italic> </jats:sub> ∼ 20–300 mag regions, suggesting that the dust grains in these dense regions can still be aligned with magnetic fields in the IC 5146 regions. Our polarization maps reveal a curved magnetic field, possibly dragged by the contraction along the parsec-scale filament. We further obtain a magnetic field strength of 0.5 ± 0.2 mG toward the central hub using the Davis–Chandrasekhar–Fermi method, corresponding to a mass-to-flux criticality of ∼1.3 ± 0.4 and an Alfvénic Mach number of &lt;0.6. These results suggest that gravity and magnetic field are currently of comparable importance in the HFS and that turbulence is less important.</jats:p>
  • Zugangsstatus: Freier Zugang