EAS Publications Series
Volume 4, 2002Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra
|Page(s)||67 - 67|
|Section||Session I: Dust and Gas Properties|
|Published online||25 September 2002|
M. Giard, J.P. Bernard, A. Klotz and I. Ristorcelli (eds)
EAS Publications Series, 4 (2002) 67
ISOPHOT observations of the UIR bands in the diffuse interstellar medium
Observatorio, PO Box. 14, 00014
Helsingin Yliopisto, Finland
Strong and broad emission bands commonly attributed to polycyclic hydrocarbons dominate the mid-infrared spectrum of interstellar matter. Early photo- and spectrometry by the ISO and IRTS missions has proved that these bands are widespread in the diffuse interstellar medium. We have sampled the galactic distribution of unidentified infrared band emission in the diffuse ISM component. The remarkable insensitivity of the shape of the UIR band spectrum is seen in this sample; little variation with line strength or galactic position is seen suggesting either a homogeneous history of the UIR band carriers within the Milky Way, convergent evolution of grains suppressing any differences seen in younger populations or an emission mechanism highly insensitive to particle type and physical conditions.
© EAS, EDP Sciences, 2002
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