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In the framework of the IMEGIN Large Program, we used the NIKA2 camera on theIRAM 30-m telescope to observe the edge-on galaxy NGC 891 at 1.15 mm and 2 mmand at a FWHM of 11.1" and 17.6", respectively. Multiwavelength data enrichedwith the new NIKA2 observations fitted by the HerBIE SED code (coupled with theTHEMIS dust model) were used to constrain the physical properties of the ISM.Emission originating from the diffuse dust disk is detected at all wavelengthsfrom mid-IR to mm, while mid-IR observations reveal warm dust emission fromcompact HII regions. Indications of mm excess emission have also been found inthe outer parts of the galactic disk. Furthermore, our SED fitting analysisconstrained the mass fraction of the small (< 15 Angstrom) dust grains. Wefound that small grains constitute 9.5% of the total dust mass in the galacticplane, but this fraction increases up to ~ 20% at large distances (|z| > 3 kpc)from the galactic plane.

Exploring the interstellar medium of NGC 891 at millimeter wavelengths using the NIKA2 camera