Galaxy Zoo Talk

Interaction Interesting Redshifts

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    I'd say here is at least interaction or even a merger.

    Strangely DECaLS gives SDSS redshifts of z=0.101 and z=0.206

    DECaLS: http://legacysurvey.org/viewer?ra=136.9485&dec=-0.0995&zoom=16&layer=decals-dr3

    Upper galaxy: http://dr12.sdss3.org/spectrumDetail?mjd=51929&fiber=63&plateid=470

    Lower galaxy: http://dr12.sdss3.org/spectrumDetail?mjd=55532&fiber=151&plateid=3818

    I suspect the aquamarine round object (exactly in the middle) is a foreground star interfering with the spectrum values. If not so then these redshifts would be rather strange as it looks like there is some form of interaction going on.

    What do you think?

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    Any thoughts on the different redshifts? Maybe a new Arp galaxy pair 😄 ?

    Posted

  • CeciliaB by CeciliaB

    My guess: The blue, starforming galaxy in the middle is nearest to us with z=0.101.

    The galaxy below with DECaLS z=0.206 is interacting with either the galaxy above the middle one (with an unknown redshift) or perhaps with the small, round

    galaxy (with PhotoZ=0.238 zErr=0.018), quite a bit below the three galaxies in the middle.

    Posted

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    Ha now that's an interesting puzzle! Three (or four) galaxies in the equation, with overlap and likely some interaction. I can see the scenario you describe, didn't even check the z of the lower galaxy...

    Would make the middle one (which resembles a star) incredibly small and round in comparison to the background galaxies though.

    Thanks!

    Posted