Source: RA (J2000): Dec (J2000):

3644+1133 12   36   44.382 ± 0.001 62   11   33.09 ± 0.01

Delta ('')	Ssky (µJy)	RAB (mag)	H+K (mag)	SISO (µJy)	z	Type	Log P (W/Hz)	Rel. (%)	Contour (sigma)
0.1	599	20.5	17.3	50	1.013	E	24.8	>99	-2,2,4,8,16,32

Notes:
The optical identification is with a bright (M_B = -23) elliptical galaxy at z = 1.013. The core of the radio source is unresolved ( < 0.1") and has a flat radio spectrum ( = 0.1 ± 0.1) with steep spectrum emission oriented N-S and extending about 15". This source is about 10% linearly polarized in the 3.5" image (P. A. = 180°), consistent with its classification as an FR-I radio source. Its radio luminosity is about 10^24.8 W/Hz.

This interesting radio source has been detected by ISO with S_{7 µm} = 50 µJy. The mid-IR radiation may be due to the stellar continuum as suggested by Rowan-Robinson et al. (1997).

The half light radius of a de Vaucouleurs surface brightness fit to the I-band image is about 1.8", or about 16 kpc at this redshift, large even for a giant elliptical galaxy. Another morphologically disturbed radio source (3641+1142) is located 20 arcsec away and is at a similar redshift. There are also at least four other galaxies within 1.5 arcmin of the central elliptical with z = 1.013 ± 0.005.

We also note the presence of an elongated chain of galaxies, or possibly a merging system in the northern radio lobe of 3644+1133 and at a similar redshift (z = 1.016). This feature is similar in appearance to the 'chain' galaxies described by Cowie et al. (1995), although it appears much larger in extent than the galaxies discussed by those authors. It is not clear what relation exists, if any, between 3644+1133 and the 'chain' galaxy which has multiple, apparently unresolved 'hot spots.' One possibility is that the 'chain' galaxy is undergoing star-formation induced by the plasma jet emerging from the red elliptical.