4.2 Previously identified inverted-spectrum sources
B1936-155: this blazar has a redshift of 1.657 (Jauncey et al. 1984).
It is classified as a high-peaking GPS source (Tornikoski et al. 2001).
The spectrum in Fig. 5 has a slightly convex shape at the maxima but
there is variability at all radio frequencies and the lower envelope is
The image found in VLBA2cm2 has an extra component to the east of the
3EG J1937-1529. J1935-1602, plausible, and J1939-1525, likely, both lie
in this elongated error box. Our analysis does not support the
previously claimed counterpart J1941-1524.
PKS 1936-155 (OV-161; Fig. 1q).--This is a blazar with high
optical polarization (Fugmann & Meisenheimer 1988) and a high redshift of
z=1.657 (Jauncey et al. 1984). It has a very steep spectrum between 1.4 and
2.7 GHz and a flat spectrum between 2.7 and 5.0 GHz, and probably to 8.4 GHz
(Quiniento & Cersosimo 1993; Impey & Tapia 1990).
VLA 6 cm observations showed the source to be unresolved, with a flux density of
0.72 Jy (Neff, Hutchings, & Gower 1989). Our VLBI image shows a single component
0.6 mas x 0.5 mas in size, elongated in the north-south direction, with a flux
density of 0.97 Jy. A slight extension to the southeast can be seen from the
map. The compact core has a brightness temperature of 4.7x10^11^ K, compared
with a lower limit of 2.5x10^11^ K from the 22 GHz survey (Moellenbrock et