Astronomical Applications Department, U.S. Naval Observatory thesis Page 53
39
0
0.2
0.4
0.6
0.7
1
1.2
25
24
23
22
21
20
HoII
0
0.2
0.4
0.6
0.8
1
1.2
25
24
23
22
21
20
IC2574
0
0.2
0.4
0.6
0.8
1
1.2
25
24
23
22
21
Sextans A
Normalized Radius
µ
FUV
(mag arcsec
-2
)
Fig. 4.4. FUV surface brightness pro les as a function of normalized radius
presented here may only be compared to FUV pro les of other galaxies observed
by the UIT. Fanelli
et
al.
1997b review FUV surface brightness pro les of galax-
ies and summarize the trends among the di erent morphological types. The Sb-c
type spirals show a nuclear peak followed by a attening until very large radii.
The late type spirals show steeper radial pro les, but they are not always expo-
nential. The IBm galaxy NGC 4449 has an exponential FUV surface brightness
pro le with in ections due to blue knots Hill
et
al.
1998. The pro le does not
have a central light depression, but this may be due to the choice of the aperture
center. Although steeper than the IC2574 and HoII pro les, the NGC 4449 pro le
shows similar characteristic in ections due to star formation at large radii from
the center. The atter pro les of the early spirals are more similar to the Sextans
A pro le, but none have a central light depression.
