At angular resolution of approximately 1'' the Cepheus A East radio so
urce is known to consist of 16 compact components clustered within a 2
5'' radius region, most of which are aligned in stringlike structures.
We present multifrequency VLA radio continuum observations of Cep A H
W2, the elongated radio object believed to be associated with the most
luminous (approximately 10(4) L.) source in the region. In the freque
ncy range from 1.5 to 43 GHz, we find that its flux density increases
with frequency as nu0.69, while the angular size of its major axis dec
reases with frequency as nu-0.57. The above frequency dependences are
very close to the theoretical values of nu0.6 and nu-0.7 expected for
a biconical thermal jet and make Cep A HW2 the best example known of t
his type of object. We suggest that Cep A HW2 is responsible for at le
ast part of the complex outflow and excitation phenomena observed in t
he region. The estimated ionized mass-loss rate in this source, approx
imately 8 x 10(-7) M. yr-1, is about 100 times larger than the value e
xpected for a star of the same luminosity in the main sequence.