FAST spectra of NGC 7027, TMC-1, and IRC+10216 show no rotational comb features from PAHs with 138 to 194 carbon atoms, yielding upper limits that may undercut models of large PAHs as unidentified infrared emission carriers.
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The Missing Giant: Do FAST Spectroscopic Observations Reveal a Scarcity of Large Polycyclic Aromatic Hydrocarbons in Astronomical Environments?
FAST spectra of NGC 7027, TMC-1, and IRC+10216 show no rotational comb features from PAHs with 138 to 194 carbon atoms, yielding upper limits that may undercut models of large PAHs as unidentified infrared emission carriers.