New Jersey will ask New York for 600 decommissioned subway cars to be sunk off the coast to create artificial reefs to attract fish, lobsters and other marine life, New Jersey environmental officials said yesterday. New Jersey, which has the East Coast’s largest artificial reef complex, stopped accepting subway cars in 2003 after environmentalists raised concerns that the cars might leach high levels of asbestos as they disintegrated. But New Jersey’s environmental protection commissioner, Lisa P. Jackson, wrote in a staff memo yesterday that studies conducted by federal agencies and by other states that have sunk subway cars satisfied her that asbestos did not pose a serious threat. Cindy Zipf, the executive director of Clean Ocean Action, a critic of the subway plan, said yesterday that she hoped New Jersey officials would ask for the subway cars with the least amount of asbestos.