@article{8096950,
  abstract     = {A correlation between the 24 mu m continuum and the [NII] 205 mu m line emission may arise if both quantities trace the star formation activity on spatially-resolved scales within a galaxy, yet has so far only been observed in the nearby edge-on spiral galaxy NGC 891. We therefore assess whether the [NII] 205-24 mu m emission correlation has some physical origin or is merely an artefact of line-of sight projection effects in an edge-on disc. We search for the presence of a correlation in Herschel and Spitzer observations of two nearby face-on galaxies, M51 and M83, and the interacting Antennae galaxies NGC 4038 and 4039. We show that not only is this empirical relationship also observed in face-on galaxies, but also that the correlation appears to be governed by the star formation rate (SFR). Both the nuclear starburst in M83 and the merger-induced star formation in NGC 4038/9 exhibit less [NII] emission per unit SFR surface density than the normal star-forming discs. These regions of intense star formation exhibit stronger ionization parameters, as traced by the 70/160 mu m far-infrared (FIR) colour. These observations suggest the presence of higher ionization lines that may become more important for gas cooling, thereby reducing the observed [NII] 205 mu m line emission in regions with higher star formation rates. Finally, we present a general relation between the [NII] 205 mu m line flux density and SFR density for normal star-forming galaxies, yet note that future studies should extend this analysis by including observations with wider spatial coverage for a larger sample of galaxies.},
  articleno    = {A45},
  author       = {Hughes, Thomas and Baes, Maarten and Schirm, MRP and Parkin, TJ and Wu, R and De Looze, Ilse and Wilson, CD and Viaene, Sébastien and Bendo, GJ and Boselli, A and Cormier, D and Ibar, E and Karczewski, OŁ and Lu, N and Spinoglio, L},
  issn         = {1432-0746},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {galaxies: star formation,galaxies: spiral,galaxies: ISM,infrared: galaxies,ISM: lines and bands,STAR-FORMATION RATE,MULTIBAND IMAGING PHOTOMETER,ULTRALUMINOUS INFRARED GALAXIES,FORMATION RATE INDICATORS,FORMATION RATES,C II,MOLECULAR GAS,CARINA NEBULA,NGC 4038/39,SPACE},
  language     = {eng},
  pages        = {7},
  title        = {The spatially resolved correlation between [NII] 205 µm line emission and the 24 µm continuum in nearby galaxies},
  url          = {http://dx.doi.org/10.1051/0004-6361/201527644},
  volume       = {587},
  year         = {2016},
}

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