  We present an analysis of Chandra X-ray observations of a compact group of
galaxies, HCG 80 (z=0.03). The system is a spiral-only group composed of four
late-type galaxies, and has a high-velocity dispersion of 309 km/s. With
high-sensitivity Chandra observations, we searched for diffuse X-ray emission
from the intragroup medium (IGM); however, no significant emission was
detected. We place a severe upper limit on the luminosity of the diffuse gas as
LX < 6e40 erg/s. On the other hand, significant emission from three of the four
members were detected. In particular, we discovered huge halo emission from HCG
80a that extends on a scale of ~30 kpc perpendicular to the galactic disk,
whose X-ray temperature and luminosity were measured to be ~0.6 keV and ~4e40
erg/s in the 0.5-2 keV band, respectively. It is most likely to be an outflow
powered by intense starburst activity. Based on the results, we discuss
possible reasons for the absence of diffuse X-ray emission in the HCG 80 group,
suggesting that the system is subject to galaxy interactions, and is possibly
at an early stage of IGM evolution.
