Do the Infrared Emission Features Need Ultraviolet Excitation? The Polycyclic Aromatic Hydrocarbon Model in UV‐poor Reflection Nebulae

2002 ◽  
Vol 572 (1) ◽  
pp. 232-237 ◽  
Author(s):  
Aigen Li ◽  
B. T. Draine
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