Contents of: VI/111/./abstract/FCOMBES_M31_SPI.abs

The following document lists the file abstract/FCOMBES_M31_SPI.abs from catalogue VI/111.
A plain copy of the file (without headers/trailers) may be downloaded.

 Because of its proximity (690kpc), the Andromeda galaxy is a
 unique opportunity to study the distribution of FIR emission
 lines in a spiral galaxy: it is the only density-wave galaxy
 where spiral arms are resolved by ISO (M33 being more stochastic).
 Physical conditions (excitation, temperature and density), as
 well as the spectral type of exciting stars, can be determined,
 as a function of location with respect to spiral arms, or main
 active regions. Observations of the Milky Way cannot give this
 global structure across an arm due to our unfavored location in
 the plane of the galaxy.
 A wealth of data are available already on M31, allowing fruitful
 comparisons with tracers of star formation: cold and dense gas
 through CO maps, atomic and more diffuse gas at 21cm, ionised
 gas (Halpha), UV and FIR tracing young stars. The CII map will
 bring new and complementary information in that it is free of
 extinction, and can probe the star-formation deep into molecular
 clouds (contrary to UV and Halpha); since it is the main coolant
 of excited regions, and the product of CO photodissociation,
 it will trace the precise locations of star-formation activity
 (and complement IRAS data). We will then determine the role of
 spiral arms and in general large-scale trigger in star-formation.

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