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Saori Konami, Kosuke Sato, Kyoko Matsushita, Shin’ya Yamada, Naoki Isobe, Atsushi Senda, Asami Hayato, Poshak Gandhi, Toru Tamagawa, Kazuo Makishima, Suzaku Observation of the Metallicity in the Interstellar Medium of NGC 4258, Publications of the Astronomical Society of Japan, Volume 61, Issue 5, 25 October 2009, Pages 941–948, https://doi.org/10.1093/pasj/61.5.941
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Abstract
The Suzaku X-ray satellite observed the nearby spiral galaxy NGC 4258 for a total good exposure time of 100 ks. We present an analysis of the Suzaku XIS data, in which we confirm that the 0.5–2 keV spectra of the interstellar medium (ISM) are well-represented by a two-temperature model. The cool and hot ISM temperatures are 0.23 |$\pm$| 0.01 and 0.58 |$\pm$| 0.01 keV, respectively. Suzaku’s excellent spectral sensitivity has enabled us to measure the metal abundances of O, Ne, Mg, Si, and Fe of the ISM for the first time. The resultant abundance pattern of O, Mg, Si, and Fe is consistent with that of the new solar abundance table of Lodders (2003, ApJ, 591, 1220), rather than Anders and Grevesse (1989, Geochim. Cosmochim. Acta, 53, 197). This suggests that the metal enrichment processes of NGC 4258 and of our Galaxy are similar.