The diffuse ISM in two edge-on galaxies-NGC891 and m82-images in the 3.3μ PAH feature

Details The diffuse ISM in two edge-on galaxies-NGC891 and m82-images in the 3.3μ PAH feature The diffuse ISM in two edge-on galaxies-NGC891 and m82-images in the 3.3μ PAH feature

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994inpht..35..383n&link_type=abstract

Infrared Physics & Technology, Volume 35, Issue 2-3, p. 383-389.

Physics

1

Scientific paper

We present infrared images at 3.3 μ (line and continuum) of two edge-on galaxies: NGC891, a ``quiet'' spiral and M82, the prototype of starburst galaxies. The interest of those images is two-fold: (i) they prove that PAH molecules, through their characteristic emission, are ubiquitously found in the large scale diffuse interstellar medium of ``quiet'' spiral galaxies, a result up to now obtained only in the Milky Way; (ii) they confirm that the intensity of the 3.3μ PAH feature is a sensitive indicator of physical conditions since it depends both on the Interstellar Radiation field intensity through the heating and destruction of the molecules and on the ISM density: here, destruction of PAHs is put in evidence in the most central part of M82 where the energy density is high. All images were done using the Paris-Meudon Observatory CIRCUS IR Camera at the Canada-France-Hawaii 3m60 telescope.

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