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A Molecular-Line Study of the Interstellar Bullet Engine IRAS05506+2414.

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|June 9, 2018
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Summary
This summary is machine-generated.

Astronomers studied the unusual bullet-outflow source IRAS05506+2414, revealing a pseudo-disk and three molecular outflows. Its unique structure suggests a novel outflow mechanism distinct from typical young stellar objects.

Keywords:
ISM: cloudsISM: individual objects: IRAS05506+2414radio lines: ISMstars: formationstars: mass lossstars: pre-main sequence

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Area of Science:

  • * Astronomy and Astrophysics
  • * Star Formation and Evolution
  • * Interstellar Medium Physics

Background:

  • * IRAS05506+2414 exhibits a wide-angle bullet spray, resembling the Orion BN/KL outflow.
  • * This outflow is associated with a large pseudo-disk and multiple molecular outflows (HVO, MVO, SEO).
  • * Classical bipolar flows from young stellar objects are driven by accretion disks, a mechanism potentially different for IRAS05506+2414.

Purpose of the Study:

  • * To investigate the physical characteristics and origin of the complex outflow system in IRAS05506+2414.
  • * To differentiate the outflow mechanism from standard accretion-disk-driven processes in young stellar objects.
  • * To explore potential models explaining the observed outflow structures and their interactions.

Main Methods:

  • * Utilized interferometric and single-dish molecular line observations.
  • * Analyzed the size, mass, and velocity structure of the pseudo-disk and outflows.
  • * Applied model-fitting to derive stellar mass and investigate infall and rotation.

Main Results:

  • * Derived a central stellar mass of 8-19 solar masses for the pseudo-disk (0.64-0.17 solar masses).
  • * Characterized three outflows: high-velocity outflow (HVO), medium-velocity outflow (MVO), and slow, extended outflow (SEO) with distinct sizes and velocities.
  • * Found similar scalar momenta in HVO and SEO, suggesting SEO resulted from HVO interacting with ambient material.

Conclusions:

  • * The bullet spray, pseudo-disk, and MVO are intimately linked and likely formed within a few hundred years.
  • * The outflow mechanism in IRAS05506+2414 appears distinct from classical accretion-disk-driven bipolar flows.
  • * Future 2nd-epoch imaging is proposed to determine proper motions and discriminate between proposed outflow models (e.g., stellar cluster decay, stellar encounters).