The PAH 7.7 $\mu$m/850 $\mu$m ratio as new diagnostics for high extinction in ULIRGs -increasing evidence for a hidden quasar in Arp 220

Publisher： Edp Sciences

E-ISSN： 1432-0746|367|3|L9-L13

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.367, Iss.3, 2001-03, pp. : L9-L13

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