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If your posted code matches what you're running, it looks like you're publishing the wrong variable. You're trying to publish the armj_acc array directly, rather than the msg2send10 message. I'm also not sure that you're allowed to assign a time directly to the header field like you've shown.

Try this:

def talker(armj_acc) :
    pub10 = rospy.Publisher('/armj_acc', obs_arm_JointAccelerations)

    msg2send10 = obs_arm_JointAccelerations()
    msg2send10.header.stamp = rospy.Time.now()
    msg2send10.accelerations = armj_acc
    pub10.publish(msg2send10)