The general (accidental pun) answer to your question is yes. General Relativity says that any form of energy is a source of gravity. Think of light, which has energy but no rest mass. Imagine a bag of light, traveling all directions so it has no net momentum. From the outside, that bag has energy but no momentum, exactly like a particle with rest mass that's not moving (in our frame). Its gravitational field looks just like that of a rest mass.
We've got more thorough background on this here: http://van.physics.illinois.edu/qa/listing.php?id=16351.
Mike W.
(published on 12/02/2014)
