Visitors 1220


3 of 81 photos
Thumbnails
Info
Photo Info

Dimensions3326 x 2504
Original file size4.57 MB
Image typeJPEG
Twin Dwarf Galaxies NGC 185 and NGC 147 in Cassiopeia

Twin Dwarf Galaxies NGC 185 and NGC 147 in Cassiopeia

APM/TMB 130/780
Field Flattener
QSI 583WSG
Astrodon Gen 2 LRGB
L: 20x10min (1x1)
RGB: 10x5min each (2x2)
Imager Temp -20C
Full Frame

Link to Larger JPEG

This pair of dwarf spheroidal (dSph) galaxies - slightly different than dwarf elliptical (dEs) - are satellites of M31, the Andromeda galaxy, with NGC 185 (left) at 2.08 million light years distant and NGC 147 (right) at a distance of 2.58 million light years. These two Andromeda satellites are now actually somewhat closer to the Milky Way than they are to Andromeda.

According to Van den Bergh, they are probably gravitationally bound in a physical pair, with NGC 185 being the more interesting and diverse, having an active galactic nucleus and being classified as a Type 2 Seyfert Galaxy. NGC 147, however, is gas and dust free.

November 1, 2010