Supernova Remnant W28

Image
Minimum credit line: Image courtesy of NRAO/AUI and M. J. Claussen, W. M. Goss, D. A. Frail, and K. Desai(for details, see Image Use Policy).

About this Image

How big is a maser? That's what Mark Claussen and his collaborators are hoping to discover with this study of the supernova remnant W28. This image is one pocket of maser activity; there are several more within the region of the exploded star. The point in question is whether or not the observed size is intrinsic to these masers, or has the image been distorted by scattering of the radio waves by interstellar dust and gas along the line of sight to the region ? Typical maser sizes in this region are in the range of 50-100 milliarcseconds. If the dimensions of the maser have been exaggerated by scattering, then other objects in the same direction should show similar characteristics because the radio waves pass through the same Galactic neighborhood. By the same line of reasoning, masers seen in areas with much less interstellar gas and dust would be smaller. They would be similar in size if minimal scattering is occurring here. Further research will be needed to determine which scenario is the case.

Investigator(s):  M. J. Claussen, W. M. Goss, D. A. Frail, and K. Desai

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This image is available in the following downloadable versions:If you would like to obtain a higher resolution version of this image, please contact Pat Smiley.

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Technical Data

    Telescope VLBA 
    Date of Observation 1997-00-00 
    Type of Observation Continuum Observations 
    Band L 
    Wavelength 20 cm 
    Frequency 1.4 GHz 
    Center of Image RA: 18:00:60.00, Dec: -23:10:60.00 (J2000)  
    Field of View 0.0002 x 0.0002 degrees  
    Technical Caption  

  • Astronomical database entries for w28
    • Query SIMBAD for more w28 data

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