Rick,

NGC 4448 is very detailed indeed, but the field is even more spectacular,
especially the two interacting galaxies to the upper right, that are
entwined in almost a 90 degree angle (the one you are describing as a polar
ring galaxy).

Stefan


"WA0CKY" schrieb im Newsbeitrag ...


NGC 4448 is a rather red flocculent galaxy in northern Coma Berenices
some 44 to 52 million light-years distant. It was discovered by William
Herschel in 1785. It made my list initially because it was a Herschel
400 galaxy but when I looked into it I saw it was quite interesting and
the field contained some really strange galaxies so it got bumped up to
high priority last spring. My entry from April 23, 1985 in my Herschel
400 log isn't very encouraging. It reads: "Large, oval galaxy, brighter
toward center, otherwise featureless, little detail seen. Seems larger
than indicated." This image of it certainly shows plenty of detail. It
is classified as SB(r)ab with HII emission from the very core.
Otherwise it seems to make few stars. I don't know if the red is dust
or old red stars. Probably both. Redshift puts it at the nearer
distance while the median of 5 widely differing measurements by 4
different methods gives a distance of 52 million light-years. They
range from 31 to 153 million light-years. If the distance is assumed to
be 50 million light-years its size is 70,000 light-years which is a
reasonable size for it.

The field contains a polar ring galaxy UGC 07576 at 330 million light
years and a strange curved flat galaxy FGC 171A (no connection to FGC
171 which is in another part of the sky entirely). NED gives two
positions for it one from the 2MFGC and the other from the FGC. The VV
catalog considers it a pair of galaxies and says VV 279 is a triple
galaxy. The two NED positions for the curved flat galaxy are at its
core and a spot between the core and the north end of the galaxy. The
error bars are somewhat larger than normal but not large enough to
overlap the two positions. I have no idea if VV 279a is related as I
find no redshift for it. The flat galaxy has a redshift that puts it
only slightly further away than NGC 4448 so the two may be related. How
it got its curved shape remains a mystery, to me at least.

The polar ring galaxy has a huge narrow polar ring. It may be really
narrow or it might be just flat and seen edge on. One paper argues for
the latter. I just call it strange. At 333 million light-years it is
unrelated to the others. Assuming the stated distance the polar ring is
some 145,000 light-years across while the main disk of the galaxy is
only 60,000 light-years across.

The very blue UGC 7597 lies above and a bit east of NGC 4448. It
appears to have a rather bright core (bar?) and a faint blue disk. It
is a large galaxy about 100,000 light-years across. LEDA 1839783 at 290
million light-years looks like a small close by blue dwarf but is
actually a rather large low surface brightness blue galaxy some 50,000
light-years in size.

All galaxies with redshifts noted at NED are shown in the annotated
image as is one quasar. Those whose catalog name is just its sky
coordinates are listed by G for galaxy or Q for quasar.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

Rick


--
WA0CKY