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16232

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DataCite Commons2023-04-21 更新2025-04-15 收录
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http://esdcdoi.esac.esa.int/doi/html/data/astronomy/hst/16232.html
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An exciting development in the understanding of the early evolutionary stages of massive stars comma based on a new study of the Orion BN-KL region comma is that the disruption of a massive young stellar system can lead to an explosive event producing a wide-angle outflow - an entirely different phenomenon from the classical bipolar flows driven by YSO accretion disks. We have discovered an object comma IRAS05506+2414 comma which may be the 2nd clear-cut example of this phenomenon. Our HST optical and near-IR images show a fan-like spray of high-velocity (up to 350 km-s) elongated knots which appear to emanate from a bright compact central source we find that the physical properties (opening angle comma outflow speeds comma knot masses comma Herbig-Haro-object like optical line emission) of the IRAS05506 wide-angle outflow are very similar to those seen in Orion. We propose to determine IRAS05506.s distance from a measurement of the knot proper motions using WFC3 to obtain a 2nd epoch F606W image. Only then will we be able to robustly constrain the central star.s luminosity and mass and the dynamical time-scale comma mass comma velocity comma and kinetic energy distributions of its outflows -- needed to test possible mechanisms for the explosive disintegration model for such sources. Deep emission-line imaging with WFC3 will be used to probe the full size and structure of the bullet spray. We will use STIS to confirm the presence of a second outflow engine in IRAS05506doublePoint an intriguing linear feature that looks like a classical YSO collimated jet can be seen emanating from the central source comma but only a long-slit spectrum of the line emission with sufficient angular resolution can confirm it to be a high-velocity jet.
提供机构:
European Space Agency
创建时间:
2023-04-21
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