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The Anatomy of Star Formation in NGC 300

Helou, G. and Roussel, H. and Appleton, P. and Frayer, D. and Stolovy, S. and Storrie-Lombardi, L. and Hurt, R. and Lowrance, P. and Makovoz, D. and Masci, F. and Surace, J. and Gordon, K. D. and Alonso‐Herrero, A. and Engelbracht, C. W. and Misselt, K. and Rieke, G. and Rieke, M. and Willner, S. P. and Pahre, M. and Ashby, M. L. N. and Fazio, G. G. and Smith, H. A. (2004) The Anatomy of Star Formation in NGC 300. Astrophysical Journal Supplement Series, 154 (1). pp. 253-258. ISSN 0067-0049. doi:10.1086/422640.

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The Spitzer Space Telescope was used to study the mid- to far-infrared properties of NGC 300 and to compare dust emission to Hα 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 μm dust emission with respect to 24 μm dust and to H II regions traced by Hα light. The 8 μm emission highlights the rims of H II regions, and the 24 μm emission is more strongly peaked in star-forming regions than 8 μm. We confirm the existence and approximate amplitude of interstellar dust emission at 4.5 μm, 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 Hα 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Helou, G.0000-0003-3367-3415
Appleton, P.0000-0002-7607-8766
Frayer, D.0000-0003-1924-1122
Storrie-Lombardi, L.0000-0002-5987-5210
Lowrance, P.0000-0001-8014-0270
Masci, F.0000-0002-8532-9395
Surace, J.0000-0001-7291-0087
Rieke, G.0000-0003-2303-6519
Rieke, M.0000-0002-7893-6170
Willner, S. P.0000-0002-9895-5758
Ashby, M. L. N.0000-0002-3993-0745
Fazio, G. G.0000-0002-0670-0708
Additional Information:© 2004. The American Astronomical Society. Received 2004 March 30; accepted 2004 May 5. The Spitzer Space Telescope is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the NASA/IPAC Extragalactic Database, which is operated by JPL/Caltech, under contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:galaxies: individual (NGC 300) ; galaxies: ISM; infrared: galaxies; stars: formation
Issue or Number:1
Record Number:CaltechAUTHORS:20170321-154553869
Persistent URL:
Official Citation:G. Helou et al 2004 ApJS 154 253
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75291
Deposited By: George Porter
Deposited On:22 Mar 2017 15:15
Last Modified:15 Nov 2021 16:32

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