Nuclear Formaldehyde Absorption in NGC 253
The Astrophysical Journal1997Vol. 491(1), pp. 134–139
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Abstract
The molecular structure observed in the j \ 6 cm K-doublet (formaldehyde) transition against H 2 CO the nucleus of NGC 253 forms an integral part of a hierarchy of structures of its nuclear region. Two distinct nuclear disk components are seen in the formaldehyde absorption data : an outer disk, also seen in other molecular tracers, and a rapidly rotating compact inner disk. Available data for the nuclear region indicates a warped edge-on inner disk structure containing prominent supernova remnants and a collimated outow oriented roughly perpendicular to the plane of the disk. No 6 cm formaldehyde emission is found in the nucleus of NGC 253.
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