we want to determine the emission properties of very small grains in the fainter regions of reflection nebulae ced201 by measuring the surface brightness distribution with isophot at different positions w.r.t. the central star. the isophot filters at 11.3, 7.7, and also at 12.8 will be used to probe the different pah emission components with respect to the continuum in the 7.3, 11.5, 20, 25, 60 and 100 micron bands. we expect to detect variations in the spectral energy distributions due to changes in the (i) ionization degree of pahs (ii) hydrogenation degree of pahs and (iii) excitation of the different populations of small grains in the 5-100 micron range. we request a 160 micron raster maps to consolidate the emission contribution of the .large. grain component. in addition we request spectrophotometric observation with pht-s in the brighter inner region of ced201 and a full lws01 spectrum on the star to determine the continuous spectral distribution.
Instrument
LWS01 , PHT03 , PHT22 , PHT40
Temporal Coverage
1997-12-21T19:27:32Z/1997-12-22T00:34:34Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, LAUREIJS et al., 1999, 'Small grains in reflection nebula CED 201', 1.0, European Space Agency, https://doi.org/10.5270/esa-4jqxjhg
