Direct spectroscopic evidence for ionized PAHs in the interstellar medium

2); (2) NASA Ames Research Center; (3) Cornell Univ); B. DeVito (3); D.M. Hudgins (2) ((1) Australian Defence Force Academy; G.C. Sloan (1; J.D. Bregman (2); L.J. Allamandola (2); T.L. Hayward (3)

Direct spectroscopic evidence for ionized PAHs in the interstellar medium

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arxiv astro-ph/9902077 v1 pith:454WZGZM submitted 1999-02-04 astro-ph

Direct spectroscopic evidence for ionized PAHs in the interstellar medium

G.C. Sloan (1 , 2) , T.L. Hayward (3) , L.J. Allamandola (2) , J.D. Bregman (2) , B. DeVito (3) , D.M. Hudgins (2) ((1) Australian Defence Force Academy , (2) NASA Ames Research Center

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(3) Cornell Univ)

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Long-slit 8-13 um spectroscopy of the nebula around NGC 1333 SVS reveals spatial variations in the strength and shape of emission features which are probably produced by polycyclic aromatic hydrocarbons (PAHs). Close to SVS 3, the 11.2 um feature develops an excess at ~10.8-11.0 um, and a feature appears at ~10 um. These features disappear with increasing distance from the central source, and they show striking similarities to recent laboratory data of PAH cations, providing the first identification of emission features arising specifically from ionized PAHs in the interstellar medium.

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