Image:
Identified with NGC 7385, an elliptical galaxy in the group of galaxies
Zw 2247.3+1107.
This is a prototypical head-tail galaxy. The active nucleus is near the
north-east tip of the structure.
High-resolution observations by
Hardee, Eilek & Owen (1980) show that
the initial ejection axis is projected parallel to the tail. The brighter
tail is the extension of the south-west jet. To the north-east,
there is a stubby lobe which could be interpreted as a "stalled" jet.
Faint emission to the north-west of the
head may be the tail associated with the north-east "jet". This seems to cross
over the bright jet to form the southern faint tail. Our image, from
archival VLA data, shows that the main jet extends considerably further to the
west than previously seen.
Simkin & Ekers (1979) discovered a
massive H II region at the edge of the NE lobe. This may be an example
of jet-induced star formation.
There are some artefacts in our image in the form of short-wavelength ripples
running SE-NW (most easily visible in the full-size image; click on the image
on this page to display). There are several compact background sources seen
projected through the tail.
Page created: 2009 Apr 2 14:16:43
J. P. Leahy
jpl@jb.man.ac.uk