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Very impressive depth and resolution on the galaxy !
I've used the image for some catalog testing ...
From the Hubble Guide Star Catalog II, stars with VMag 21 (the catalog limit) are easily visible. I reckon you have stars to about VMag 22.5.
There's also about 100 galaxies from the Principal Galaxies Catalogue. The faint one PGC3169353 top left (red square) has a radial velocity of 77,000 km/s, putting it about 3.7 billion light years away.
Like the microquasar you mentioned, there's bound to all sorts of other interesting things in there.
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