36
center of the galaxy where the average central surface brightness is
F
U
V
=21.37
mag arcsec
,2
0
:
14. Following the central peak, the pro le attens and then
peaks a second time at r
6
0
due to the large knot in the northeastern part of
the galaxy. The highest measured surface brightness levels are found in the knot,
F
U
V
=17.5 mag arcsec
,2
in a resolution element 4
00
.
0
2
4
6
8
10
Radius (arcminutes)
25
24
23
22
21
µ
FUV
(mag arcsec
-2
)
Fig. 4.2. The FUV surface brightness pro le of IC2574
Unlike the HoII and IC2574 pro les, in ections due to star formation serve
to atten the Sextans A pro le at higher surface brightness levels. This pro le,
presented in Fig. 4.3, shows relatively low surface brightness levels in the center
represented by a central depression with an average value of
F
U
V
=22.03 mag
arcsec
,2
0
:
3. Following the central depression, the pro le brightens and has a
relatively constant value of
F
U
V
22.2 mag arcsec
,2
. A slight drop in brightness
is followed by a second plateau at r
2
0
, which can be attributed to the presence
