The Anatomy of Star Formation in NGC 300

Helou, G., Roussel, H., Appleton, P., Frayer, D., Stolovy, S., Storrie-Lombardi, L., Hurt, R., Lowrance, P., Makovoz, D., Masci, F., Surace, J., Gordon, K. D., Alonso-Herrero, A., Engelbracht, C. W., Misselt, K., Rieke, G., Rieke, M., Willner, S. P., Pahre, M., Ashby, M. L. N., Fazio, G. G., & Smith, H. A.
2004, The Astrophysical Journal Supplement Series, 154, 253

The Spitzer Space Telescope was used to study the mid- to far-infrared properties of NGC 300 and to compare dust emission to HЮБ to elucidate the heating of the interstellar medium (ISM) and the star formation cycle at scales smaller than 100 pc. The new data allow us to discern clear differences in the spatial distribution of 8 ЮМm dust emission with respect to 24 ЮМm dust and to H II regions traced by HЮБ light. The 8 ЮМm emission highlights the rims of H II regions, and the 24 ЮМm emission is more strongly peaked in star-forming regions than 8 ЮМm. We confirm the existence and approximate amplitude of interstellar dust emission at 4.5 ЮМm, detected statistically in Infrared Space Observatory (ISO) data, and conclude it arises in star-forming regions. When averaging over regions larger than ~1 kpc, the ratio of HЮБ to aromatic feature emission in NGC 300 is consistent with the values observed in disks of spiral galaxies. The mid- to far-infrared spectral energy distribution of dust emission is generally consistent with pre-Spitzer models.

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