Alma Mater Studiorum Universit`a degli Studi di Bologna ... - Inaf
Alma Mater Studiorum Universit`a degli Studi di Bologna ... - Inaf
Alma Mater Studiorum Universit`a degli Studi di Bologna ... - Inaf
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142 Data reduction and imaging of lobed ra<strong>di</strong>o galaxies<br />
0 2 4 6 8 10<br />
12 54 30<br />
00<br />
53 30<br />
DECLINATION (J2000)<br />
00<br />
52 30<br />
00<br />
51 30<br />
12 25 09 08 07 06 05 04 03 02 01<br />
RIGHT ASCENSION (J2000)<br />
p = 1<br />
12 25 09 08 07 06 05 04 03 02 01<br />
RIGHT ASCENSION (J2000)<br />
Figure 13: Images of M 84 at 1.65 arcsec resolution. Left: Total intensity at 4.9 GHz in mJy<br />
(beam area) −1 . Right: Apparent B a vectors with lengths proportional to p 4.9 derived from the<br />
4-frequency RM fits at 4.5 arcsec, superimposed on a false-colour <strong>di</strong>splay of the total intensity<br />
gra<strong>di</strong>ent at 4.9 GHz.<br />
90 ◦ in projection. Lower-resolution observations were previously shown by Laing & Bridle (1987)<br />
so are not repeated here.<br />
The right panel of Fig. 13 shows the apparent magnetic field structure. In the N lobe, the<br />
magnetic field is predominantly perpen<strong>di</strong>cular to the presumed path of the jet along its mid-line.<br />
The magnetic field in the S lobe is broadly circumferential and a sudden increase in the degree of<br />
polarization at the edge of the lobe is apparent.<br />
142