I'll do my best...
NCTom wrote: ↑Fri Apr 09, 2021 3:01 pm
What is the chance of seeing an image like this annotated to note the various items in view such as types of galaxies, structural components of the central galaxy, and any other points of interest such faint star streams? The enlarged view is a treasure house of variety.
This is what the annotations mean:
: Anomalous arms emerging from the nuclear region of M106. They are bright in X-rays
, radio emission
and possibly hydrogen alpha (because of the red color).
: Bright yellow center, with a brilliant core. All really large spiral galaxies have them.
: The yellow bulge of M106. All major spiral galaxies have them, too (with perhaps an extremely few exceptions
). The bulge is yellow, because all the stars in there are old and yellow and red. But there are fewer stars in the bulge than in the nuclear region, so the bulge is not as bright as the nucleus.
: Very bright region of star formation. The brilliant young stars inside are still completely hidden by their pink-glowing hydrogen alpha birth cloud, so this is a very young region of star formation.
Another very bright, but slightly older region of star formation. The brilliant blue stars inside have burst through their pink birth cloud.
: A still bright, but even older cluster of massive blue stars. The pink birth cloud has been completely dispersed by the stars' powerful stellar winds.
: An even older region of star formation. Practically all the really bright and massive stars have already died here, most of them in supernova explosions. But huge numbers of more modest stars like Vega and Sirius remain, giving the region a pale bluish hue.
I didn't annotate any dust lanes. They are important, and all major spiral galaxies have them. In an optical image, the dust lanes will look dark brown. They look brown because interstellar matter, which is a mixture of a lot of gas and small amounts of dust particles
, mostly made of silicates and ices, concentrate in the dust lanes and make them look dark.
Dust lanes are also typically sites of star formation. In my annotated image, 5
are all young clusters that were born from the matter that gets concentrated in dust lanes. But please note that long stretches of dust don't contain any young clusters or pink nebulas at all.
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