Can I use my iMac as the display with my MacBook Air?

Here is the hardware configuration of my iMac:

Hardware Overview:

Model Name: iMac

Model Identifier: iMac9,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2.66 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache: 6 MB

Memory: 4 GB

Bus Speed: 1.07 GHz

Boot ROM Version: IM91.008D.B08

SMC Version (system): 1.36f3

Serial Number (system): QP9110FF0TH

Hardware UUID: 27452321-D9B4-5639-8CC0-8BC5543A76CC

I can't tell from the documents posted about Target Display Mode whether my iMac is properly equipped. Help!