UGC 9242 (lowenthalm)

UGC 9242

Acquisition type: Lucky imaging

This is a rather ghostly looking Sd type edge-on spiral. Typical of Sd type spirals, UGC 9242 completely lacks a central bulge, with the core marked only by a bright stellar object. The literature points to a lack of a bulge indicating that this galaxy has experienced very few mergers with other small galaxies, which cause bulges in spirals to grow. UGC9242 seems pretty lonely, with no galaxies close to it anywhere in the field, so nothing to merge with!

The galaxy appears pretty blue, so it would seem a lot of star forming is occurring. The brighter knots are large O-B associations of young hot blue stars in giant clusters. One of these clusters at the upper right has a more intensely blue-green color than the other clusters in this galaxy. Not sure what causes this color. I have seen knots with similar colors (rarely!) in a few other galaxies, but haven't come across an explanation for this in the literature.

UGC9242 is estimated to be about 80 million light years away, based on its redshift. Assuming this distance, and given its angular size of a little over 5 arc minutes in diameter, its true size should be about 120,000 light years, a somewhat wider than our own galaxy. It fairly dim too with a brightness of visual magnitude 13.5, so needs a big scope to pick out visually.

The small bright star-like fuzzy yellow blob just to the left of UGC9242 is actually distant background galaxy LEDA/PGC 2152475. It is likely the anchor elliptical of the cluster of little galaxies near it, all of which have similar large redshifts indicating a distance of about 1.1 billion light years. Considering its, distance, this elliptical galaxy quite bright at a visual magnitude of 16.5.

This a stack of 8 eight minute images. Each of these 8 images was a live stack of 320 x 1.5 second exposures.

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Status	Advanced success
Started	...
Astrometry.net job	4458662
PixInsight job	7QZH7QR2IPSIYVWJBSPTF7UTTBWXC5XY
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h25m20s.620
RA (top/left)	14h25m19s.830
RA (top/right)	14h24m36s.915
RA (bottom/right)	14h25m22s.161
RA (bottom/left)	14h26m04s.416

Dec (center)	+39°32′19″.11
Dec (top/left)	+39°41′31″.83
Dec (top/right)	+39°28′35″.31
Dec (bottom/right)	+39°23′06″.48
Dec (bottom/left)	+39°36′01″.75

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UGC 9242

UGC 9242

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