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

M. Haas, U. Klaas, S. A. H. Müller, R. Chini and I. Coulson

A&A, 367 3 (2001) L9-L13

Published online: 15 March 2001

DOI: 10.1051/0004-6361:20010065

M. Haas

U. Klaas

S. A. H. Müller

R. Chini

I. Coulson

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