One of several galaxies which comprise Arp 48, an example of a spiral galaxy with faint companions. The main component, PGC 4789 (also referred to as Arp 48 NED02 in the NED) has an apparent size of 0.7 by 0.4 arcmin, but other than that and the data above, nothing else seems to be available. The western component (Arp 48, or Arp 48 NED01 in the NED) has a recessional velocity of 14485 km/sec, but save for its position (RA 01 19 59.2, Dec +12 20 38), nothing else is listed. The eastern component has nothing listed but its position (RA 01 20 02, Dec +12 20 50). Presuming that the three are all at the same distance, the following can be inferred; but if that presumption is wrong, so are the conclusions based on it. The recessional velocity suggests a distance of about 650 million light years. For PGC 4789, the apparent size (taken from the image) is about 0.5 by 0.4 arcmin, which would imply a size of about 100 thousand light years. For the western component, Arp 48 NED01, the apparent size is about 0.2 by 0.15 arcmin, which would imply a size of about 40 thousand light years. For the eastern (unlisted) component, the apparent size is about 0.15 by 0.15 arcmin, which would imply a size of about 30 thousand light years. |
