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Related Experiment Videos

Large Proper-Motion Infrared

Raines, Watson, Pipher

    The Astrophysical Journal
    |December 22, 1999
    PubMed
    Summary
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    Astronomers detected high proper-motion velocities in the Herbig-Haro object GGD 37 using [Fe II] emission imaging. A newly identified object, GGD 37:RWPF 1, exhibits the highest velocity recorded for a Herbig-Haro object.

    Area of Science:

    • Astrophysics
    • Stellar Evolution
    • Herbig-Haro Objects

    Background:

    • Herbig-Haro objects are crucial for understanding star formation.
    • Previous studies have focused on their morphology and spectral properties.

    Purpose of the Study:

    • To detect and measure proper motions in the [Fe II] 1.644 µm emission of GGD 37.
    • To identify the source of the outflows and determine their velocities and directions.

    Main Methods:

    • Imaging observations of GGD 37 were conducted over a 5-year period.
    • Data were collected at three distinct epochs: 1993.67, 1996.71, and 1998.68.
    • Proper motions were analyzed using the [Fe II] 1.644 µm emission line.

    Main Results:

    Related Experiment Videos

  • Proper-motion velocities were measured at 400+/-200 km s-1 for GGD 37:W2.
  • A new object, GGD 37:RWPF 1, was identified with a proper-motion velocity of 850+/-200 km s-1.
  • GGD 37:RWPF 1's velocity is the highest recorded for a Herbig-Haro object to date.
  • GGD 37:RWPF 1's motion is westward, away from Cep A East.
  • GGD 37:W2's motion is north/northwest, not directly linked to compact objects in Cep A East.

    • Conclusions:

    • The detected proper motions provide insights into the dynamics of Herbig-Haro objects.
    • The high velocity of GGD 37:RWPF 1 suggests a powerful outflow event.
    • The distinct motion directions may indicate multiple outflow sources or complex interactions within the GGD 37 system.