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Text: Here we discuss the interpretation of our previously published NICMOS infrared images of a 90 ′′ wide region centered on BN / KL , focusing on the structure of the H 2 emission . Examination of the F190N images , originally obtained for subtracting continuum from the Pα 1.87 µm images ( Paper 1 ) , suggested that in many regions there was a strong correlation with the H 2 1 - 0 S(1 ) 2.12 µm continuum - subtracted images . In fact , the F190N filter bandpass includes both the H 2 1 - 0 S(4 ) and the 2 - 1 S(6 ) lines at 1.89 µm . This H 2 emission is likely produced in shocks ( Gautier et al . 1976 ) . H 2 emission can also be produced through UV fluorescence , but larger beam studies of multiple H 2 transitions by Usuda et al . ( 1996 ) , Rosenthal et al . ( 2000 ) , and many others have shown that the measured line ratios in this region are consistent only with thermal excitation and not UV fluorescence . In this paper , we focus on the finger - like structures and the HH objects . Some of these objects have optical counterparts , which places constraints on their position within the cloud / nebula interface . In § 2 we discuss the observations and data reduction . In § 3 we compare the observed H 2 line brightnesses with several classes of shock models in order to determine shock types , shock velocities , and gas densities . In § 4 we discuss the morphology of , and emission from , many of the more distinct , brighter features seen in our images .<|eot_id|><|start_header_id|>assistant<|end_header_id|>

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