Markarian 817, Mrk 817, QSO J1436+5847

430 million light-years (132 million parsecs)

This image is 1.9 arcminutes (232,000 light-years or 71,000 parsecs) wide.

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)

F438W (B), F555W (V), F680N (H-alpha + [N II]), and F814W (I)

NASA, ESA, and the Hubble SM4 ERO Team

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)