MultiCore Queries? are they possible

[Ninad Raut]

Hi,
Can we create a Join query between two indexes on two cores? Is this
possible in Solr?
I have a index which stores author profiles and other index which stores
content and a author id as a reference. Can I query as
select Content,AuthorName
from Core0,Core1
where core0.authorid = core1.authorid and authorid=A123
Regards,
Ninad