Infrared spectrophotometry of NGC 7023 with ISOCAM.
D. Cesarsky, J. Lequeux, A. Abergel, M. Perault, E. Palazzi, S. Madden, D. Tran;
AaA, 1996, 315, L305
ABSTRACT:We present spectrophotometric observations of the reflection nebula NGC 7023 obtained with the ISOCAM Circular Variable Filter (CVF) in the
spectral range 5.15 to 16.5{mu}m.
Maps in the 16{mu}m continuum emission and in
the Unidentified Infrared Bands (UIBs) have been obtained.
The
continuum emission peaks at the dense interface between the surrounding
molecular cloud and the inner photodissociated region.
The whole spectrum
(UIBs and continuum) becomes systematically harder closer to the exciting
star.
Our observations show that it is entirely due to the same category of
carriers, probably PAHs heated transiently by single photons, and that the
systematic spectral changes inside NGC 7023 are due to changes in the size
distribution or/and ionization degree of these particles.
KEYWORDS: ism: individual: ngc 7023, ism: dust, ism: molecules, ism: reflection nebulae, infrared: ism: lines and bands, infrared: ism: continuum
PERSOKEY:dust, ,
CODE: cesarsky96a