3C 84

B0316+413

Basic Data
S178 Alpha FR Class ID Spectrum Best z mag. LAS lg P178 D
66.80.78IRD/SSC Gal0.0179R(c) = 11.171350.0024.52 454.0

Image:


Size: 1024.0 × 1024.0 arcsec²
LUT: Logarithmic
Beam: 21 arcsec
Frequency: 1380 MHz
Method: SDCLN ՘>21
Telescope: VLA C+D
Credits: Pedlar et al. (1990)

3C 84 is is the famous radio galaxy Perseus A, identified with NGC 1275, the dominant giant elliptical galaxy in the Perseus cluster.

NGC 1275 was one of the original group of six galaxies with strong nuclear emission lines studied by Seyfert (1943), which gave rise to the term Seyfert Galaxy. However NGC 1275 differs from the other five in that it is a radio-loud elliptical instead of a radio-quiet spiral, and hence it is now generally regarded as a radio galaxy rather than a Seyfert Galaxy. (Curiously, Seyfert thought that it was a spiral, partly because a spiral galaxy in the cluster is seen projected in front of NGC 1275, and makes its optical structure appear much more complicated than a normal elliptical).

NGC 1275 is at the centre of a massive cooling flow visible in X-ray images of the Perseus cluster (see Richard White's Perseus Cluster page).

The radio structure is complicated and particularly difficult to image well. At the very centre is an extremely bright flat-spectrum core, often imaged with VLBI (e.g. Romney et al. 1996). In our image this has been subtracted to make the extended structure more visible; its position is marked by the green cross at the centre of the red region. The latter is the steep-spectrum core (SSC) which at higher resolution is a pair of lobes with the southern one dominated by a knotty jet. On larger scales still lies the extended halo, which dominates our image. The small-scale ripples ringing the central peak are artifacts caused by the bright central core. The compact peaks at the left of the picture and to the NNW of the centre are background radio sources, while the compact feature at the western tip of the structure is the nucleus of another Persues cluster galaxy, NGC 1272. The lack of compact structure in the halo gives this object its Relaxed Double classification. In fact the halo is much larger than is visible here, essentially filling the region covered by this picture. The full extent is shown in the C20 image.


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Page created: 2009 Apr 2 14:16:42
J. P. Leahy
jpl@jb.man.ac.uk