For our domain, example.com, we have 2 subdomains: a0.example.com and a1.example.com. These 2 are meant only for product images -- images stored here are accessed like a0.example.com/var1/var2/prod_id_img_1.jpg, and linked from products listed under www.example.com. There is no other usage of these subdomains.
Before release, we had a page at (a0|a1).example.com saying 'Coming Soon', which we missed out to remove later on (as not accessed from our main site).
Now, we find that when we search for our domain, 'example', then the 1st sitelink is 'Coming Soon' and links to a0.example.com (the other 5 sitelinks shown are valid).
How do I properly get rid of this page so that it doesn't show up on google sitelinks (and any other searches, if any)? Should I just remove it to effect a 404 status or should I run it through 410, or do I need to do anything else -- for a proper removal (for ever)?
Scanning through the nginx logs, I notice that google bot is periodically looking for sitemaps under (a0|a1).example.com. Am I missing any explicit configuration due to which google bot is looking for sitemaps here, or is this behaviour kind of standard and I need not worry?
On webmaster, we have example.com and www.example.com properties. example.com is not configured but www.example.com is and is working fine. Do I need to do anything with example.com property that may help with our (s0|s1).example.com usage?
Thank you in advance for your help.