Abundance Patterns in the Interstellar Medium of the S0 Galaxy NGC 1316 (Fornax A) Revealed with Suzaku

作者：Konami Saori^*; Matsushita Kyoko; Nagino Ryo; Tashiro Makoto S; Tamagawa Toru; Makishima Kazuo

来源：Publications of the Astronomical Society of Japan, 2010, 62(6): 1435-1443.

DOI：10.1093/pasj/62.6.1435

• galaxies: abundance
• galaxies: individual (NGC 1316)
• galaxies: interstellar medium

The Suzaku X-ray satellite observed the nearby S0 galaxy NGC 1316, a merger remnant aged 3 Gyr. The total good exposure time was 48.7 ks. The spectra were well represented by a two-temperature thermal model for the interstellar medium (ISM) plus a power-law model. The cool and hot temperatures of the thermal model were 0.48 +/- 0.03 and 0.92 +/- 0.04 keV, respectively. The excellent spectral sensitivity of Suzaku enables us for the first time to measure the metal abundances of O, Ne, Mg, Si, and Fe in the ISM. The resultant abundance pattern of O, Ne, Mg, Si, and Fe is close to that of the new solar abundance determined by Lodders (2003, ApJ, 591, 1220). The measured abundance pattern is compared with those of elliptical galaxies and an S0 galaxy, observed with Suzaku. Considering metal-enrichment from present Type la supernovae, the near-solar abundance pattern of the ISM in NGC 1316 indicates an enhanced alpha/Fe ratio of stellar materials in the entire galaxy, like in giant elliptical galaxies.

• 出版日期2010