Can I add an image in the lower right corner of my histogram? I want to look something like this:

This is a link to the image I want to add. https://postimg.org/image/3zrzf3vpr/ Do I need to resize it before connecting it, or can I do this in code?
Here is my Plunker: http://plnkr.co/edit/sekJlYevx2dw28zLuC4d?p=preview
I assumed that I could add this similar to how I add text using what I have below. Although, if this is the best way to do this without relying on xaxis, it would be fantastic.
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.append("text")
.attr("class", "label")
.attr("x", 170)
.attr("y", 40)
.style("text-anchor", "end")
.text("Source: D.C. Open Data, D.C. Policy Center");
but it’s hard for me to figure out how to do this.
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