Stellar Populations and the Star Formation Histories of LSB Galaxies—Part I: Optical and Hα Imaging

Figure 7

Comparison of the H𝛼 flux determined by grid photometry of the HII regions versus aperture photometry of the entire galaxy volume. The red line is a linear fit to the data, and the blue line is the one-to-one correspondence line. The aperture values are, on average, 40% higher than the grid photometry values. This can be attributed to diffuse emission presumably spread throughout the galaxy stellar population [15].