NASA NTRS · 20060040821
Markarian 421's Unusual Satellite Galaxy
Abstract
We present Hubble Space Telescope (HST) imagery, and ground-based spectroscopy and CCD photometry of the active galaxy Markarian 421 and its companion galaxy 14 arcsec to the ENE.
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Gorham, P., Zee, L., Unwin, S., Jacobs, C.. 1999-01-01. Markarian 421's Unusual Satellite Galaxy. https://ntrs.nasa.gov/citations/20060040821
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