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published topic dose not appear in the list of rostopics?

Hello

I have a ros enabled model plugin, in which I am publishing the pose of a robot. Similar way as in the following answer

http://answers.gazebosim.org/question/1991/what-is-the-best-way-to0-learn-gazebo-in-ros-for/

The problem is when I check out the published topics using rostopic list, the topic (gz/pose) do not appear in the list when I start gazebo with roslaunch [package name] [launch_file]

but when I start gazebo with ( gazebo file.world), the topic appeared in the list of rostopics. Can anyone please tell me why this might happen? And what I did wrong?

Thanks in advance