Galaxy Zoo Talk

Yellow squares in the data

  • Dave_Newsome by Dave_Newsome

    This is the second time I have gotten a picture of a yellow square bieng presented as a galaxy just thought someone should know

    Posted

  • ElisabethB by ElisabethB moderator

    It is an artifact. More info here :
    http://tinyurl.com/GZartifacts

    Happy hunting ! D

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  • JeanTate by JeanTate

    Although it's odd that these particular artifacts ('yellow square galaxies') are still being offered up for classification: this one, for example, was noted as being an artifact back on March 16 2014, surely it should have been removed then (or soon after)?

    Posted

  • ElisabethB by ElisabethB moderator

    Or it could be that because the classifications are all over the place, this one keeps turning up ! 😄

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  • JeanTate by JeanTate in response to ElisabethB's comment.

    Yes, and if we put our heads together, we could surely come up half a dozen other possible explanations! 😄

    No word from anyone on the Science Team (who presumably know)?

    Posted

  • ElisabethB by ElisabethB moderator

    Zoomed out to the max :
    enter image description here
    You can see that it is some sort of cosmic scarf. 😄 At the edge of SDSS footprint there appear a lot of artifacts !
    And here you can find a scientist's opinion : http://tinyurl.com/GZartifacts

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  • JeanTate by JeanTate in response to ElisabethB's comment.

    Cosmic scarfs (scarves?); very cool! 😄 Was it Alice who coined this catchy phrase?

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  • ElisabethB by ElisabethB moderator

    I can't remember, but it sure sounds like something Alice would come up with ! 😄

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  • vrooje by vrooje admin, scientist

    We can probably take out the images in question, or most of them, with either a blanket removal of an entire imaging region or a cut based on artifact votes so far. Other projects in Zooniverse can automatically retire images early if enough people give answers equivalent to "artifact/not useful", but Galaxy Zoo doesn't have that. So I'll have to do it manually, and I will, as I agree it's worth doing -- but I'm about to start an observing run for other GZ science, so it may not get done right away. But will keep you posted!

    Cheers,
    -Brooke

    Posted

  • zutopian by zutopian

    Here is a poorquality image, which is part of another #scarf .: AGZ00033e6 . Image was displayed for classification today.

    PS: Related blog post on 4 Dec 2012.: http://blog.galaxyzoo.org/2012/12/04/removing-data-artifacts/

    Posted