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Antoniseb:
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VanderL:
When a galaxy emits light, it needs stars and dust/plasma to do so
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No, just stars.
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Well, not quite, plasma can be glowing, and reflections off dust also gives "light", making the densest parts of galaxies opaque for background objects.
You're right about the false colors the densest parts are black (giving off the most amount of light), the other colors only show the structure.
In the image of the galaxy no individual stars of NGC 7319 are recognizable, only regions of high and low intensity light. Doesn't that imply that the amount of stars of the densest parts is so great that it is opaque for a background object?
I really don't see any holes in the galaxies' core region.
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Tim Thompson:
But I don't know the angular scale, and can't tell from the image published in Galianni, et al., where the quasar object is in this image. That would tell me whether or not I think it likely to be visible through NGC 7319.
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Maybe
these images show the details a little better?
Cheers.