Neutral hydrogen super-shell in the Milky Way

Neutral hydrogen super-shell in the Milky Way

Recently, scientists decided to look closely at the neutral hydrogen supernova GS242-03 + 37 - a large structure in the Milky Way. Analysis offers a new insight into the nature of this object and its interactions with the environment.

Super-shell (super-bubble) - large cavities with hundreds of light years, filled with atoms of hot gas. Gaseous material in super-shells, cut out by supernovae and stellar winds, blows on the surrounding interstellar medium, as it is inferior in density.

GS242-03 + 37 found in 1979. This is a neutral hydrogen super-bubble located in the outer Milky Way. It is the dominant object in neutral galactic hydrogen maps, and its size and location make it possible to use the object as a laboratory for studying the effects of large shells on their environment.

Neutral hydrogen super-shell in the Milky Way

The maximum gas density HI (left) and its thickness (right) based on a simple conversion from HI data to a Gaussian gas HI distribution using a rotation curve. Black lines represent distances from 10 kpc (lowest line) to 1 kpc. The upper shell of the GS242-03 + 37 is clearly visible on both maps Based on radio observations of neutral hydrogen and carbon monoxide, as well as the available data on star clusters in a specific area, the researchers were able to carry out numerical simulations of the super-shell structure, which made it possible to calculate important parameters of this cavity. In the simulation used hydrodynamic code RING.

It turned out that GS242-03 + 37 can be considered a relatively old structure, whose age is not less than 80 million years (possibly 120 million years). It is believed that it manages to survive so long because it lives close to the corotation radius of the spiral structure, so that it does not collapse by the passage of the spiral arms. The analysis raised doubts about the current status of the structure. It is estimated that the GS242-03 + 37 is not as energetic as previously believed. The remaining characteristics can be obtained with a more in-depth study.

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