"Genuine" irregular galaxies in SDSS - a new paper by Terao et al .
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KWillett
scientist, admin, translator
Hi everyone,
I wanted to point out an interesting paper that just appeared on astro-ph. It's by a group of astronomers in Japan (K. Terao et al.) who combed two much smaller surveys of the SDSS for what they call "genuine" irregular galaxies - those without bulges, disks, bars, or any obvious large-scale, symmetrical structure. They found only 33 in their whole sample, and used the data to confirm that "genuine" irregulars, as they call them, are both chemically and dynamically younger than comparable elliptical or spiral galaxies. Using the power of citizen science and Galaxy Zoo, though, I'm confident we could make a significant improvement on the number of possible examples.
The link to the paper is here: http://arXiv.org/abs/1312.0364
How many of these are galaxies that users found in the original Galaxy Zoo or GZ2? And are there ideas for how we could extend/improve what they've done? Maybe by comparing with some good Collections people have for irregular galaxies?
- Kyle (science team)
cross-posted from the forum
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KWillett
scientist, admin, translator
For example, I think this object
http://talk.galaxyzoo.org/#/subjects/AGZ0002jz2
is a good example of the type of morphology discussed in Terao et al. Note that it doesn't have any nearby companions, obvious signs of a merger, bulge or bar. Figure 7 in their paper shows SDSS images of their examples.
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