Discovery of Blue Luminescence in the Red Rectangle: Possible Fluorescence by Neutral Polycyclic Aromatic Hydrocarbon Molecules

Details Discovery of Blue Luminescence in the Red Rectangle: Possible Fluorescence by Neutral Polycyclic Aromatic Hydrocarbon Molecules Discovery of Blue Luminescence in the Red Rectangle: Possible Fluorescence by Neutral Polycyclic Aromatic Hydrocarbon Molecules

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..oss.b6001v&link_type=abstract

American Physical Society, Ohio Section Spring 2004, April 16-17, 2004, Ohio University, Athens, Ohio, MEETING ID: OSS04, abstra

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We will present our discovery of a band of blue luminescence (BL) in the Red Rectangle (RR) nebula. This enigmatic proto-planetary nebula is also one of the brightest known sources of extended red emission as well as of unidentified infra-red (UIR) band emissions. The spectrum of this newly discovered BL is most likely fluorescence from small neutral polycyclic aromatic hydrocarbon (PAH) molecules. PAH molecules are thought to be widely present in many interstellar and circumstellar environments in our galaxy as well as in other galaxies, and are considered likely carriers of the UIR-band emission. However, no specific PAH molecule has yet been identified in a source outside the solar system, as the set of mid-infra-red emission features attributed to these molecules between the wavelengths of 3.3 μm and 16.4 μm are largely insensitive to molecular sizes. In contrast, near-UV/blue fluorescence of PAHs is more specific as to size, structure, and charge state of a PAH molecule. If the carriers of this near-UV/blue fluorescence are PAHs, they are most likely neutral PAH molecules consisting of 3-4 aromatic rings such as anthracene (C_14H_10) and pyrene (C_16H_10).

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