Markarian 817

Active galaxy Markarian 817

About the colours

This image is a composite of separate exposures made by the WFC3 instrument on the Hubble Space Telescope. Four filters were used to sample broad and narrow wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are: Blue: F438W (B) Green: F555W (V) Red: F680N (H-alpha + [N II]) + F814W (I)

About the data

The Hubble images/spectrum were created from data from proposal 11505 : K. Noll (STScI) and J. Green, C. Froning, and B. Keeney (University of Colorado, Boulder).

Acknowledgments for Markarian 817 Observers: K. Noll (STScI) and J. Green, C. Froning, and B. Keeney (University of Colorado, Boulder) Data Analysis: J. Anderson and M. Mutchler (STScI), and C. Froning and J. Green (University of Colorado, Boulder) Image Composition: Z. Levay and L. Frattare (STScI) Text: L. Frattare, D. Weaver and R. Villard (STScI) Illustrations: A. Feild and Z. Levay (STScI) Video Animation: G. Bacon (STScI) Science Consultants: M. Livio (STScI) and C. Froning and J. Green (University of Colorado, Boulder)