4.5.4. A1367
A1367 is an irregular, BM type II-III cluster
(Bautz and Morgan, 1970;
Carter and Metcalfe,
1980)
with a moderately high spiral fraction
(Bahcall, 1977c).
It has a low X-ray luminosity Lx
4 ×
1043h50 - 2 erg/s and a
temperature Tg
3 × 107 K
(Mushotzky, 1984).
The X-ray emission is extended and elongated
(Figure 27a);
Bechtold et al.
(1983)
found an X-ray core radius (equation 4.7) of
rx = (0.8 ×
0.4)h50-1 Mpc for the semimajor and
semiminor axes of the
distribution. In addition, 8 point sources and 13 resolved peaks in the
X-ray emission (with typical sizes of an arc minute) were observed at
higher spatial resolution (Figure 27b), 11 of which were associated with
cluster galaxies. These galaxies have X-ray luminosities in the range
1040-42h50 - 2 erg/s. 21
cm observations indicate that some of these galaxies also
contain neutral hydrogen
(Chincarini et
al., 1983).
A1367 is the only irregular cluster that appears to
have an extended radio halo
(Hanisch, 1980).
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Figure 27. The X-ray surface brightness of the A1367 cluster of galaxies, observed by Bechtold et al. (1983) with the Einstein satellite. Contours of constant X-ray surface brightness are shown superimposed on the optical image of the cluster. (a) The lower resolution IPC image, showing the irregular cluster emission. (b) The higher resolution HRI image, showing many discrete sources within the cluster, many of which are associated with individual cluster galaxies. |