Too Many Supernovae Can Slow Star Formation in a Galaxy - by spacewriter
“We have seen galactic winds driven by cosmic rays in our own Milky Way and the Andromeda galaxy, which have much weaker rates of star formation, but not before in a galaxy such as M33,” said Fatemah Tabatabaei, of the Institute for Research in Fundamental Sciences in Iran. Tabatabaei and a team of scientists used the VLA, the Effelsberg radio telescope in Germany, and a selection of millimeter-wave, visible-light, and infrared telescopes to observe this neighboring galaxy.
Large amounts of cosmic rays build up a pressure front that slams into stellar creches filled with gas and dust. The wind action blasts apart the clouds and carries away the needed stellar building blocks. Essentially, the cosmic rays drive winds that quench star formation. That can be pretty damaging to a growing galaxy, which should be rich with star birth regions. This is why it’s important to study the ISM and trace the creation and emission of cosmic rays during star death.
“The VLA observations indicated that cosmic rays in M33 are escaping the regions where they are born, making them able to drive more extensive winds,” said William Cotton, of the National Radio Astronomy Observatory. Based on these observations, the astronomers suspect that many supernova explosions and supernova remnants in M33’s highly active star formation regions made such cosmic ray-driven winds more likely.
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