Hydrogen Emission from a 30 Myr Old Superbubble II

Minimum credit line: Image courtesy of NRAO/AUI and Yurii Pidopryhora, NRAO & Ohio University(for details, see Image Use Policy).

About this Image

A nearby superbubble recently discovered with the 100 m Green Bank Telescope (GBT) is shown as a false color image. Green color is neutral hydrogen detected by its 21 cm radio emission, purple -- ionized hydrogen detected by its optical emission, white -- where there are matching amounts of both neutral and ionized hydrogen. The diagonal green stripe at the bottom results from a stretch of cosmic dust known as the Great Rift of the Milky Way, blocking all the light behind it including the superbubble's ionized hydrogen emission, while the radio emission is not hindered by dust. Such superbubbles are known to be blown by powerful stellar winds and supernovae occuring in star clusters in arms of both our and other spiral galaxies. It took approximately 30 million years and the energy of about 100 supernovae to create this one, which is more than 3 kpc high and is located about 7 kpc from the Sun and 4 kpc from the Galactic center. It is currently at the latest stages of its development, its expansion is stopped and its walls are starting to decompose.

Investigator(s):  Yurii Pidopryhora, Felix J. Lockman, Joseph C. Shields

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Technical Data

    Telescope GBT 
    Date of Observation 2005-08-22 
    Type of Observation Spectral Line Observations 
    Center of Image RA: 17:45:31.00, Dec: 05:09:3.00 (J2000)  
    Field of View 25.0000 x 35.0000 degrees  
    Technical Caption HI image: About 250,000 GBT HI spectra integrated over 60-160 km/s LSR. The integration covers all the tangent point velocities at these longitudes. The intensity scale has been multiplied by sine of Galactic latitude to compress the dynamic range and show structures more clearly. Angular resolution is about 9 arcmin. The noise has been removed in areas not related to the bubble. The original GBT HI survey was used for the most of the map, but data from the lower resolution Leiden-Dwingeloo survey by Hartmann & Burton (1997) were used to fill the space around the edges. H-alpha image: integrated over 55-95 km/s LSR, as observed with the Wisconsin H-Alpha Mapper (data of WHAM survey by Haffner et al. 2003 interpolated and imaged by Yurii Pidopryhora). Angular resolution is about 1 degree. Imaging and matching of coordinate systems was done in AIPS++ by Yurii Pidopryhora. Please refer to Pidopryhora, Lockman and Shields paper submitted to ApJ for more scientific information on the superbubble.  

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