Use of /tmp folder on AIX

Hello all,
Does anyone know what is the folder /tmp used for on AIX? We are wondering whether we can clean up this folder since in this moment is 9GB in space, the information we have seen in there seem like temporal copies of installations or installation medias as shown below:

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-rw-rw-r--    1 ecmadmin ecm       869835057 Oct 25 2011  /tmp/heapdump.20111025.094917.299234.phd

-rw-rw-r--    1 ecmadmin ecm       471719936 Jan 21 2010  /tmp/content_tempo1/oracle/ucm/server/bin/core.20100121.085421.508148.dmp

-rw-rw-r--    1 ecmadmin ecm       471392256 Jan 21 2010  /tmp/content_tempo1/oracle/ucm/server2/bin/core.20100121.085400.843902.dmp

-rw-rw-r--    1 ecmadmin ecm       456376320 Jan 21 2010  /tmp/content_tempo1/oracle/ucm/server/admin/bin/core.20100121.085434.454760.dmp

-rw-rw-r--    1 ecmadmin ecm       455000064 Jan 21 2010  /tmp/content_tempo1/oracle/ucm/server2/admin/bin/core.20100121.085344.512118.dmp