Galaxy Zoo Talk

Nebula / dark areas / artifacts

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    Might the dark area below the galaxy be some sort of nebula?

    Also a hint of the area in SDSS, although image is pixelated;

    enter image description here

    enter image description here DECaLS DR2

    Posted

  • Budgieye by Budgieye moderator

    Dark area is probably where a cosmic ray was cut out, and a grey area substituted. Strange that SDSS has the same thing. Coincidence? what was cut out?

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR in response to Budgieye's comment.

    Indeed, intriguing questions! Might the same code for removal be used in SDSS and DECaLS, and if so what is cut out? Two different surveys rules out a cosmic ray hit.

    Here is another one, maybe tidal debris mimicking a round feature? Seems rather undisturbed so unlikely with below example, which is more convincing in DECaLS and SDSS, looks like some big light-poor object;

    AGZ000bbm3

    enter image description here
    DECaLS DR1

    enter image description here
    SDSS DR9

    EDIT: new processed picture

    enter image description here

    Hmm maybe tidal debris after all...

    Possible other one AGZ000b0yp

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    AGZ000b0yp

    DECaLS DR1

    enter image description here DECaLS DR1

    enter image description here
    DECaLS DR2 image

    enter image description here
    SDSS9

    enter image description here SDSS DR9 inverted + processed

    http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=130.61890106583184&dec=29.40509628086925

    Posted

  • Budgieye by Budgieye moderator

    Strange.. Two different telescopes showing the same artifact in the same place.

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    Yes, on multiple objects so doesn't seem like a freak accident.

    Ah well i'll just keep updating former ones and posting new ones here. See what pops out eventually 😃

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    Just above central galaxy AGZ000ar7s

    enter image description here SDSS DR9

    enter image description here " processed

    enter image description here DECaLS DR1

    enter image description here DECaLS DR1 Residuals

    Posted