The local space density of dwarf galaxies
Jon Loveday
Abstract
We estimate the luminosity function of field galaxies over a range of ten magnitudes (-22 < MBJ < -12 for H0 = 100 km/s/Mpc) by counting the number of faint APM galaxies around Stromlo-APM redshift survey galaxies at known distance. The faint end of the luminosity function rises steeply at MBJ ≈ -15, implying that the space density of dwarf galaxies is at least two times larger than predicted by a Schechter function with flat faint-end slope. Such a high abundance of dwarf galaxies at low redshift can help explain the observed number counts and redshift distributions of faint galaxies without invoking exotic models for galaxy evolution.
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