Agz0004dtx, reflection, gas cloud, other?
Green haze, is it a gas cloud or an imaging issue?
It's an imaging - or more accurately GZ4 image processing - issue. There's a bright star, stage left, in a different field (likely run). The GZ4 image was created using data from just the one field.
Here's the region, zoomed out, from the SDSS DR8 tool Navigate: