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An Imaging Survey of Early‐Type Barred Galaxies

  • Authors: Peter Erwin and Linda S. Sparke

Erwin & Sparke 2003 The Astrophysical Journal Supplement Series 146 299.

  • Provider: AAS Journals

Caption: Fig. 4.

Examples illustrating the use of unsharp masks: (a) one‐dimensional ﹩r^{1/ 4}﹩ intensity profile with narrow Gaussian added at ﹩r=2.5﹩ (solid line) along with Gaussian‐smoothed version (dashed line); (b) one‐dimensional unsharp mask produced by dividing original profile by smoothed profile; (c) R‐band contours of double‐barred galaxy NGC 2950; (d) unsharp mask (﹩\sigma =5﹩) of the same image, showing secondary bar; (e) larger scale R‐band contours of the same galaxy; (f) unsharp mask (﹩\sigma =20﹩), showing primary bar.

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