The Milky Way Project Talk

What Are Yellowballs?

  • ttfnrob by ttfnrob admin, scientist

    I asked science team member Matt Povich about the #yellowball objects and he said this that they are most likely extremely bright compact or ultracompact HII regions. They look bright and yellow because they saturate the image in the 8 and 24 ┬Ám. You can think of them as small, very luminous bubbles.

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  • ttfnrob by ttfnrob admin, scientist

    By the way - if you haven't seen this type of page before - it's a discussion about a keyword set - the images on the right will keep updating when you tag things as containing a #yellowball.

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  • kirbyjp by kirbyjp in response to ttfnrob's comment.

    ttfnrob, are we to circle the yellowball objects? If so, they seem to be solid, round items, should we use the "small bubble" annotation, or use the circle drawing tool to trace the outer limit of just the yellow ball?

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  • ttfnrob by ttfnrob admin, scientist in response to kirbyjp's comment.

    kirbyjp - no don't draw them as bubbles - mark them as 'green knots' for now. We may add a specific item in the list for them.

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  • katieofoz by katieofoz

    Thanks, I had been marking them as green knots but thought they might be small bubbles

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  • PattyD by PattyD

    So how do I tag something as an artefact?

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  • jules by jules moderator in response to PattyD's comment.

    Hi PattyD,
    If you click "Discuss" - you can then put #artefact in the comments box. Your picture will then show up on search using "artefact."

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  • PattyD by PattyD

    At last, enlightenment. I may get the hang of this after all.

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  • kgwaite by kgwaite

    thanks for putting that up. I've been seeing a lot of those but didn't know what they were.

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  • gwolfchase by gwolfchase scientist

    According to my postdoc, Milky Way Project science team member Kim Arvidsson, yellowballs actually represent different categories of objects. Kim cross-checked the list of current yellowball identifications with various catalogs, so if anyone has a particular favorite, we may be able to tell you some more about it (not all yellowballs could be identified with catalog objects). Adler MWP team members are particularly interested in distinguishing regions forming really massive stars from those forming less massive stars, in order to learn more about the conditions under which massive stars form.

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  • Gaumondd by Gaumondd

    Arte the bright red speres foreground stars?

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  • ttfnrob by ttfnrob admin, scientist

    This has all now resulted in a paper. You can get the details here on the MWP blog: http://blog.milkywayproject.org/2015/01/28/a-new-paper-all-about-yellowballs/

    Thanks to all who helped make this possible.

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