astro-ph/0210394.

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Abstract. The K correction "corrects" for the fact that sources observed at different redshifts are, in general, compared with standards or each other at different rest-frame wavelengths. It is part of the relation between the emitted- or rest-frame absolute magnitude of a source in one broad photometric bandpass to the observed-frame apparent magnitude of the same source in another broad bandpass. This short pedagogical paper provides definitions of and equations for the K correction.

Table of Contents

• INTRODUCTION
• EQUATIONS
• DISCUSSION
• REFERENCES

¹ Center for Cosmology and Particle Physics, Department of Physics, New York University

² david.hogg@nyu.edu

³ Department of Physics and Astronomy, The Johns Hopkins University

⁴ Steward Observatory, University of Arizona