We report the discovery of X-rays from both components of Cepheus A, East and
West, with the XMM-Newton Observatory. HH 168 joins the ranks of other
energetic Herbig Haro objects that are sources of T~10^6 K X-ray emission. The
HH 168 effective temperature is T = 5.8 (+3.5,-2.3) x 10^6 K and its unabsorbed
luminosity is 1.1 x 10^29 erg s^-1, making it hotter and less luminous than
other representatives of its class. We also detect prominent X-ray emission
from the complex of compact radio sources believed to be the power sources for
Cep A. We call this source HWX and it is distinguished by its hard X-ray
spectrum, T = 1.2 (+1.2,-0.5) x 10^8 K, and complex spatial distribution. It
may arise from one or more protostars associated with the radio complex, the
outflows, or a combination of the two. We detect 102 X-rays sources; many
presumed to be pre-main sequence stars based upon the reddening of their
optical/IR counterparts.Comment: 15 pages, 8 figures, data table not included because of size limit