The ParticleSystem attached to this GameObject (null if there is none attached).

	particleSystem.Emit(5);

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        particleSystem.Emit(5);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		particleSystem.Emit(5)