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Absorption line forest, excited by cosmic rays<br />
• These stars make magnetic fields, explode, and then<br />
make cosmic rays:<br />
• These cosmic rays excite characteristic transitions in<br />
massive gaseous shells of molecular surrounding the<br />
HNR<br />
• Absorption line forest: H2, H + 2 , H+ 3<br />
• Identify groups of lines, originating from specific HNRs,<br />
and in the beam-adding need to be able to identify each<br />
HNR separately<br />
20<br />
• In any beam of a telescope many such lines, so very<br />
high signal to noise required<br />
• If such lines confirmed, key signature for a) cosmic rays,<br />
and by inference b) magnetic fields - and all at a known<br />
redshift: line equivalent width − > mass scale
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