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We present Suzaku off-center observations of two poor galaxy groups, NGC 3402and NGC 5129, with temperatures below 1 keV. Through spectral decomposition, wemeasured their surface brightnesses and temperatures out to 530 and 1430 timesthe critical density of the universe for NGC 3402 and NGC 5129, respectively.These quantities are consistent with extrapolations from existing innermeasurements of the two groups. With the refined bolometric X-ray luminosities,both groups prefer $L_X$-$T$ relations without a break in the group regime.Furthermore, we have determined the electron number densities and hydrostaticmasses at these radii. We found that the surface brightness and electron numberdensity profiles require two $\beta$ model components, as well as theindication that a third $\beta$ model may be needed for NGC 3402. Adding thegas mass measured from the X-ray data and stellar mass from group galaxymembers, we computed baryon fractions of $f_b$ = 0.0693 $\pm$ 0.0068 and $f_b$= 0.095 $\pm$ 0.014 for NGC 3402 and NGC 5129, respectively. Combining otherpoor groups with well-measured X-ray emission to the outskirts, we found anaverage baryon fraction extrapolated to $r_{500}$ of $\overline{f_{b,500}}$ =0.0912 $\pm$ 0.0050 for X-ray-bright groups with temperatures between 0.8 and1.3 keV, extending existing constraints to lower-mass systems and indicatingthat significant baryon losses exist below approximately $r_{500}$.

Suzaku Measurements of Hot Halo Emission at Outskirts for Two Poor Galaxy Groups: NGC 3402 and NGC 5129