Nature
Supermassive Black Hole Lurks at Dawn of the Universe
The spectrum obtained using the Gemini Near-Infrared Spectrograph (GNIRS) combined with observations from the Magellan Telescope appears in red; gaps are regions of low sky transparency. The optical spectrum (from the Large Binocular Telescope; black) and noise (magenta) are also plotted. The inset shows the three components of the fit to a portion of the near-infrared emission. The ionized magnesium (Mg II; blue) is used to estimate the extremely large black hole mass mass, of 12 billion times the mass of the Sun.
