3C 264


Basic Data
S178 Alpha FR Class ID Spectrum Best z mag. LAS lg P178 D
28.30.75IWP+HP Gal0.0214R(c) = 12.16 522.0024.30 208.6


Size: 768.0 × 768.0 arcsec²
LUT: Logarithmic
Beam: 12.2 arcsec
Frequency: 1442 MHz
Method: CLEAN ՘>12.2
Telescope: VLA CS
Credits: David Russell / This Atlas

Identified with NGC 3862, the largest elliptical galaxy in Abell 1367. This is a classic "unrelaxed" cluster of galaxies (e.g. Lazzati et al. 1998), and NGC 3862 is well offset from the cluster centre, which is over a hundred kpc to the NW. Richard White's set of cluster "mug shots" includes optical and X-ray images of A 1367.

The large scale radio structure is usually classified as a peculiar kind of twin tail; unusual because the two tails are not exactly parallel and also because of the diffuse "halo" surrounding the bright compact core. At high resolution a short, bright, one-sided radio and optical jet (Baum et al. 1997) extends from the core towards the NE. At intermediate resolution the jet bends and becomes much fainter but can be traced into a weak hotspot (Lara et al. 1997). This hotspot appears in our image as a barely visible peak just to the NE of the core. Lara et al's image also shows a weak feature to the SW, which may be the other hotspot. It is not clear which hotspot feeds which tail. The core is also bright in X-rays (e.g. Edge & Rottgering 1995).

The jet is presumably one-sided because of relativistic beaming, which suggests that the blob-like appearance of the central region may be enhanced because our line of sight is fairly close to the jet axis, causing significant forshortening. If so, the large-scale structure might better be explained as a "wide-angle tail" (c.f. 3C 465) seen close to the plane of the tails.

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Page created: 2009 Apr 2 14:16:43
J. P. Leahy