2001A&A...373L...5B


Query : 2001A&A...373L...5B

2001A&A...373L...5B - Astronomy and Astrophysics, volume 373, L5-8 (2001/7-1)

Singular value decomposition: A tool to separate elementary contributions in ISOCAM spectral maps.

BOISSEL P., JOBLIN C. and PERNOT P.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): methods: data analysis - ISM: dust - ISM: molecules - infrared: ISM: lines and bands - infrared: ISM: continuum - ISM: individual objects: NGC 7023

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 LZK 12 Y*O 03 29 10.4138336046 +31 21 59.070333199   16.06 14.25     B5:V+F2: 131 0
2 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 667 0
3 HD 200775 Ae* 21 01 36.9205762896 +68 09 47.789578836 7.34 7.754 7.427 8.13   B2Ve 531 0

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2022.08.10-06:52:55

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