The galaxy compact group Stephan's Quintet in the r band from GMOS

Image of the galaxy compact group Stephan's Quintet in the r band from GMOS. Over-plotted are the neutral hydrogen (HI) column gas density contours. The three boxes in the upper left corner indicate the areas where the new intergalactic HII regions were found. The top panels feature zoomed views of these regions. Note that they lie well within the HI tail.