Spectral analysis of the elliptical galaxy NGC 7796 with suzaku

OpenAlex · İngilizce

We report Suzaku X-ray spectral analysis of the elliptical galaxy NGC 7796. We found the temperature and the abundances of O (∼0.54 keV), Ne (∼0.87 keV), Mg (∼1.30 keV), Si (∼1.84 keV), (hearafter O–Si), and Fe (∼6.4 keV) in the NGC 7796 for the first time. O–Si and Fe abundances and temperatures in the ISM are estimated to be 0.81−0.43+0.57,0.66−0.26+0.26,0.63−0.24+0.25,1.10−0.49+0.50,0.45−0.05+0.06, in solar units, and 0.57−0.03+0.04 keV, respectively. We obtained ratios of O/Fe, Ne/Fe, Mg/Fe, and Si/Fe are 1.80−0.97+1.28,1.47−0.60+0.60,1.40−0.55+0.58, and 2.44−1.12+1.15, respectively. Our results demonstrate that NGC 7796 is a super-solar metallicity galaxy. Core-collapse supernovae (CCSNe) replenish the environment with elements like O–Si according to theories of galactic chemical evolution. We found high ratios that suggest a bigger fraction of stars carrying more CCSN products than those in elliptical galaxies, or an abundance of CCSNe in NGC 7796. Furthermore, for the center region of NGC 7796, we performed simulations for the XRISM and the Athena X-ray missions.