Galaxy Zoo Talk

Blue objects / group?

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    These galaxies are tagged as group, although many have very different redshifts.

    What are the blue objects called? Are they considered an tidal debris effect, irregular galaxies themselves or something in between?

    It also looks like they have different PhotoZ z's than the bigger galaxies, are they considered to be in a group with them or a group on themselves?

    Love to learn some more about them, don't think ive seen these before, or at least so many near each other.

    Live to learn more of

    Posted

  • CeciliaB by CeciliaB

    The galaxy below the centre in the image is one of the galaxies mentioned in Keel, William C:s Galaxy Zoo survey for giant AGN-ionized clouds.

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  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    Ah yes, i found it. And see it's just marked as such AGZ000bl0f. 😛

    And the other ones are considered galaxies, irregular / peculiar?

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  • CeciliaB by CeciliaB

    Funny that AGZ000bl0f turned up today in Talk just by chance. I recognized it from the image you are asking about here in 'Science'.

    The small, blue galaxy below the biggest one is an HII galaxy with z=0.028. The biggest galaxy in the image is NGC 3860, which is an AGN with z=0.018. It's a

    part of Abell Galaxy Cluster 1367 in constellation Leo.

    The small, blue objects in the image are labelled 'objects of unknown nature' in SDSS. In articles where NGC 3860 is mentioned, different objects in its

    vicinity are described, such as small groups of uncatalogued, starforming dwarf galaxies, dwarf HII galaxies and Ha-emitting knots.

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  • Budgieye by Budgieye moderator

    Lovely. 😃

    Green colour in SDSS illustrates the hot hydrogen that you talked about.

    enter image description here
    http://skyservice.pha.jhu.edu/DR9/ImgCutout/getjpeg.aspx?ra=176.22757422&dec=19.79237962&scale=0.09903175&width=400&height=400&opt=&query=

    http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=176.22827387545692&dec=19.792835627826797

    http://www.aanda.org/articles/aa/full/2006/27/aa4873-06/aa4873-06.html

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