Spitzer-IRS mapping of the inner kpc of NGC 253: Spatial distribution of the Ne III, PAH 11.3 microns and H2 (0-0) S(1) lines and a gradient in the Ne III/Ne II line ratio

Details Spitzer-IRS mapping of the inner kpc of NGC 253: Spatial distribution of the Ne III, PAH 11.3 microns and H2 (0-0) S(1) lines and a gradient in the Ne III/Ne II line ratio Spitzer-IRS mapping of the inner kpc of NGC 253: Spatial distribution of the Ne III, PAH 11.3 microns and H2 (0-0) S(1) lines and a gradient in the Ne III/Ne II line ratio

2004-06-07

arxiv.org/abs/astro-ph/0406172v1

Astronomy and Astrophysics

Astrophysics

17 pages, 5 figures ApJ accepted

Scientific paper

10.1086/423035

We present our early results of the mapping of the nucleus of the starburst galaxy NGC 253 and its immediate surroundings using the Infrared Spectrograph onboard the Spitzer Space Telescope. The map is centered on the nucleus of the galaxy and spans the inner 800 x 688 pc2. The spatial distribution of the \neiii line at 15.55 microns and the polycyclic aromatic hydrocarbons feature at 11.3 microns peaks at the center while the purely rotationnal transition of molecular hydrogen at 17.03 microns is strong over several slit positions. We perform a brief investigation of the implications of these measurement on the properties of the star formation in this region using theories developped to explain the deficiency of massive stars in starbursts.

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