Green Object near the center
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by metalmania
If you zoom into the SDSS image for this AGZ000ba60, right near the nucleus at 8oclock is a small green object, this doesn't show in DECaLS.
I don't think it's an asteroid (there's no purple component I can see) plus it looks part of the galaxy.
Any ideas?Posted
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by JeanTate in response to metalmania's comment.
Here's a zoomed in SDSS image:
It looks real, doesn't it? And it's likely too small to show up in POSS images; has this field been imaged by a CFHT survey perhaps? What does it look like in UKIDSS? If you download SDSS data into DS9, how obvious is the green object in the other four SDSS bands/filters?
Hope this helps, and happy hunting! 😃
Posted
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The focal point of the spectra is exactly in the middle of the two 'objects', while the photometric object is the galaxy center
Posted
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by JeanTate in response to Ghost Sheep SWR's comment.
At first glance, the spectrum seems quite usual:
However, if you examine it using the interactive spectrum tool, it turns out to be somewhat unusual! For example, the nebular [NII] 6583 emission line is quite strong, the [OII] 3725/3727 ones rather weak (cf their usual strong appearance), and the H-alpha emission only ~as strong as the [NII] 6583.
No sign, to my amateur eyes, of anything like a 'green star' in the spectrum. Perhaps it was a transient (the SDSS photometry/images were taken at quite different times from the spectra)?
Posted