Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...373l...5b&link_type=abstract
Astronomy and Astrophysics, v.373, p.L5-L8 (2001)
Astronomy and Astrophysics
Astrophysics
6
Methods: Data Analysis, Ism: Dust, Ism: Molecules, Infrared: Ism: Lines And Bands, Infrared: Ism: Continuum, Ism: Individual Objects: Ngc 7023
Scientific paper
Singular value decomposition (SVD) is applied to a mid-infrared ISOCAM spectral map of NGC 7023. As a first result, this decomposition provides a mathematical analysis of the map in terms of a linear combination of elementary spectra. After further processing, it is shown that the spectrum observed on each pixel can be described as the physical superposition of four components. Three of them can be attributed to the intrinsic spectra of polycyclic aromatic hydrocarbons (PAH), very small grains and larger dust grains respectively. The fourth component is a differential spectrum that could trace the ionisation state of PAHs. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) with the participation of ISAS and NASA.
Boissel Pierre
Joblin Ch.
Pernot Pascal
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