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Software & Processing Notes |
CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin,
Noel Carboni's actions
and Russell Croman's GradientXTerminator.
PixFix32 (pre-beta) to
repair hot/cold pixels and column defects.
eXcalibrator for (u-g), (g-r) color calibration, using 5 stars
from the SDSS database.
CCDStack to calibrate, register,
normalize, data reject, combine sub exposures & color combine for
the LRGB.
PhotoShop CS3 for
non-linear stretching
and LLRGB combine |
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Comment |
North is to the
top.
This beautiful trio of
galaxies is in the area of the constellation Coma Berenices. NGC
4725 (center) and NGC 4747 (upper left) are neighbors at a distance
of 45 to 57 million and 40 to 56 million light-yrs respectively.
Galaxy NGC 4712, at the lower right, is in the background... about
207 million light-years away.
Tidal interaction with supergiant spiral NGC 4725, is the generally
accepted cause for the severe distortion of the smaller NGC 4747
galaxy.
This interaction has given NGC 4747 three tidal tails, two large at
the upper left and a smaller one at the opposite end of the galaxy.
The direction of these three plums trace directly towards NGC
4725.
NGC 4725 has its own peculiarities. While most spiral galaxies have
two or more arms, NGC 4725 seems to have only one.
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