no. they can't arrest you on a civil judgment.
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I say err on the side of caution. Show the letter to an attorney who handles debt collection and ask them what they think. Most attorneys offer a free initial consultation and so you have nothing to lose.
It's hard to tell from your question what exactly you recieved. There is something called an information subpoena which in general should be responded to. I'd recommend that you get a free copy of your credit report at www.myannualcreditreport.com and contact an attorney who handles debt collection defense and bankruptcy.
Yes you can potentially be arrested. Failure to answer an information subpoena could subject you to a contempt of court violation and that would be a basis to be arrested for violating a court order. It happened to a client of mine in the past.