Comparison of optical (CaT) and near-IR (CO 2.29μm) σ◦

For luminous infrared galaxy (LIRG) mergers (left), velocity dispersion measured with CO (CO σ0) is significantly lower than that measured with the Calcium II Triplet (CaT σ0). For non-LIRG mergers and normal elliptical galaxies (middle and right), there is no meaningful difference between the two techniques.

Credit:

International Gemini Observatory/NOIRLab/NSF/AURA

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Id:geminiann10007b
Type:Chart
Release date:March 11, 2010, 5:34 p.m.
Related announcements:geminiann10007
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