Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-09
Astronomy and Astrophysics
Astrophysics
29 pages with 9 figures, accepted for publication in PASJ Vol 60, second Suzaku special issue
Scientific paper
We present results of 120 ks observation of a compact group of galaxies HCG~62 ($z=0.0145$) with Suzaku XIS and HXD-PIN\@. The XIS spectra for four annular regions were fitted with two temperature {\it vapec} model with variable abundance, combined with the foreground Galactic component. The Galactic component was constrained to have a common surface brightness among the four annuli, and two temperature {\it apec} model was preferred to single temperature model. We confirmed the multi-temperature nature of the intra-group medium reported with Chandra and XMM-Newton, with a doughnut-like high temperature ring at radii 3.3--6.5$'$ in a hardness image. We found Mg, Si, S, and Fe abundances to be fairly robust. We examined the possible ``high-abundance arc'' at $\sim 2'$ southwest from the center, however Suzaku data did not confirm it. We suspect that it is a misidentification of an excess hot component in this region as the Fe line. Careful background study showed no positive detection of the extended hard X-rays previously reported with ASCA, in 5--12 keV with XIS and 12--40 keV with HXD-PIN, although our upper limit did not exclude the ASCA result. There is an indication that the X-ray intensity in $r<3.3'$ region is $70\pm 19$% higher than the nominal CXB level (5--12 keV), and Chandra and Suzaku data suggest that most of this excess could be due to concentration of hard X-ray sources with an average photon index of $\Gamma=1.38\pm 0.06$. Cumulative mass of O, Fe and Mg in the group gas and the metal mass-to-light ratio were derived and compared with those in other groups. Possible role of AGN or galaxy mergers in this group is also discussed.
Awaki Hisamitsu
Egawa Chihiro
Fukazawa Yasushi
Hoshino Akio
Hughes John Patrick
No associations
LandOfFree
Suzaku Observation of HCG 62: Temperature, Abundance, and Extended Hard X-ray Emission Profiles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Suzaku Observation of HCG 62: Temperature, Abundance, and Extended Hard X-ray Emission Profiles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Suzaku Observation of HCG 62: Temperature, Abundance, and Extended Hard X-ray Emission Profiles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-702363