An ALMA view of molecular filaments in the Large Magellanic Cloud II: An early stage of high-mass star formation embedded at colliding clouds in N159W-South - IRFU-SAP Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2019

An ALMA view of molecular filaments in the Large Magellanic Cloud II: An early stage of high-mass star formation embedded at colliding clouds in N159W-South

Kazuki Tokuda
  • Fonction : Auteur
Yasuo Fukui
  • Fonction : Auteur
Ryohei Harada
  • Fonction : Auteur
Kazuya Saigo
  • Fonction : Auteur
Kengo Tachihara
  • Fonction : Auteur
Kisetsu Tsuge
  • Fonction : Auteur
Tsuyoshi Inoue
  • Fonction : Auteur
Kazufumi Torii
  • Fonction : Auteur
Atsushi Nishimura
  • Fonction : Auteur
Sarolta Zahorecz
  • Fonction : Auteur
Omnarayani Nayak
  • Fonction : Auteur
Margaret Meixner
  • Fonction : Auteur
Tetsuhiro Minamidani
  • Fonction : Auteur
Akiko Kawamura
  • Fonction : Auteur
Norikazu Mizuno
  • Fonction : Auteur
Remy Indebetouw
  • Fonction : Auteur
Marta Sewiło
  • Fonction : Auteur
C. -H. Rosie Chen
  • Fonction : Auteur
Toshikazu Onishi
  • Fonction : Auteur

Résumé

We have conducted ALMA CO isotopes and 1.3 mm continuum observations toward filamentary molecular clouds of the N159W-South region in the Large Magellanic Cloud with an angular resolution of $\sim$0."25 ($\sim$0.07 pc). Although the previous lower resolution ($\sim$1") ALMA observations revealed that there is a high-mass protostellar object at an intersection of two linear-shaped filaments in $^{13}$CO with the length scale of $\sim$10 pc (Fukui et al. 2015), the spatially resolved observations, in particular, toward the highest column density part traced by the 1.3 mm continuum emission, the N159W-South clump, show complicated hub-filamentary structures. We also discovered that there are multiple protostellar sources with bipolar outflows along the massive filament. The redshifted/blueshifted components of the $^{13}$CO emission around the massive filaments/protostars show complementary distributions to each other, which is considered to be a possible piece of evidence for a cloud-cloud collision. We propose a new scenario that the supersonically colliding gas flow triggered the formation of both the massive filament and protostars. This is a modification of the earlier scenario of cloud-cloud collision which postulated the two filamentary clouds prior to the high-mass star formation by Fukui et al. (2015). A recent theoretical study of the shock compression in colliding molecular flows by Inoue et al. (2018) demonstrates that the formation of filaments with hub-structure is a usual outcome of the collision, lending support for the present scenario. In the theory the filaments are formed as dense parts in a shock compressed sheet-like layer, which resembles "an umbrella with pokes".
Fichier principal
Vignette du fichier
1811.04400.pdf (2.22 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02347010 , version 1 (02-12-2020)

Identifiants

Citer

Kazuki Tokuda, Yasuo Fukui, Ryohei Harada, Kazuya Saigo, Kengo Tachihara, et al.. An ALMA view of molecular filaments in the Large Magellanic Cloud II: An early stage of high-mass star formation embedded at colliding clouds in N159W-South. The Astrophysical Journal, 2019, 886 (1), pp.15. ⟨10.3847/1538-4357/ab48ff⟩. ⟨hal-02347010⟩
65 Consultations
35 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More