  We investigate the habitability of hypothethical moons orbiting known
exoplanets. This study focuses on big, rocky exomoons that are capable of
maintaining a significant atmosphere. To determine their habitability, we
calculate the incident stellar radiation and the tidal heating flux arising in
the moons as the two main contributors to the energy budget. We use the runaway
greenhouse and the maximum greenhouse flux limits as a definition of
habitability. For each exoplanet we run our calculations for plausible ranges
of physical and orbital parameters for the moons and the planet using a Monte
Carlo approach. We calculate the moon habitability probability for each planet
which is the fraction of the investigated cases that lead to habitable
conditions. Based on our results, we provide a target list for observations of
known exoplanets of which the top 10 planets have more than 50\% chance for
hosting habitable moons on stable orbits. Two especially promising candidates
are Kepler-62~f and Kepler-16~b, both of them with known masses and radii. Our
target list can help to detect the first habitable exomoon.
