Radio Galaxy Zoo Talk

ARG0003a3z - you don't see this very often

  • JeanTate by JeanTate

    The host of this somewhat asymmetric doublelobe is, perhaps, z_ph 0.217±0.1325/0.360±0.1445 SDSS J211215.39+073108.4, an odd-looking green smudge:

    enter image description here
    enter image description here

    There's rather a lot of green stuff about, in the SDSS image, so maybe SDSS J211215.39+073108.4 is just a local enhancement? And what is the green stuff anyway?

    Zoom out and it become clear:

    enter image description here

    It's a foreground - within our own galaxy - nebula! 😮 😄

    Question: is it a reflection nebula (starlight reflecting off dust)? Or an HII nebula (the green is H-alpha emission)? Or ... ?

    The image in this post was created from sources, and using methods, described in this RGZ Talk post. The object at the center of the image is SDSS J211215.39+073108.4.