Image:4C 11.71 | B2247+113 |
| S178 | Alpha | FR | Class | ID | Spectrum | Best z | mag. | LAS | lg P178 | D |
|---|---|---|---|---|---|---|---|---|---|---|
| 11.7 | 0.75 | I | HP+WP | Gal | 0.0250 | R(c) = 12.20 | 892.00 | 24.05 | 413.9 |
Image:
| Size: | 1280.0 × 1280.0 arcsec² |
|---|---|
| LUT: | Logarithmic |
| Beam: | 22×106 arcsec |
| Frequency: | 1415 MHz |
| Method: | CLEAN
|
| Telescope: | WSRT |
| Credits: | Robertson (1981) |
This is a prototypical head-tail galaxy. The bright head region is unresolved in the north-south direction with our very elongated beam. High-resolution observations by Hardee, Eilek & Owen (1980) show that the initial ejection axis is projected parallel to the tail. Most of the tail appears to be the extension of the south-west jet. To the north-east, there is a stubby lobe which could be interpreted as a "stalled" jet. A VLA map at intermediate resolution (Condon & Broderick 1988) shows faint emission to the north-west of the head (not resolved from the head at all in our image). This may be the tail associated with the north-east "jet".
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.
The extensions to the east and north from the bright head are calibration
artifacts.
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