Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-16
Astronomy and Astrophysics
Astrophysics
13 pages, LaTeX (or Latex, etc); Figures 1-2 are large, greyscale plate; full-resolution plates in .pdf format available at
Scientific paper
10.1086/423320
Images taken with the IRAC instrument on the Spitzer Space Telescope show that the spatial distribution of warm dust emission in lenticular galaxies is often organized into dynamically-stable structures strongly resembling spiral arms. These galaxies have bulge-to-disk-ratios and colors for their stellar content appropriate for their morphological classification. Two of the three galaxies with warm dust detected at 8.0 um also show far-IR emission expected from that dust. More importantly, the [5.8]-[8.0] color of the dust emission matches the colors found for late-type, star-forming galaxies, as well as theoretical predictions for PAH emission from dust grains. The spatially resolved dust structures may be powerful indicators of the evolutionary history of the lenticular class of galaxies, either as a tracer of on-going quiescent star formation or as a fossil record of a previous episode of more active star formation.
Ashby Matt L. N.
Fazio Giacomo
Pahre Michael A.
Willner Steve P.
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