Suzaku Observation of the Metallicity in the Interstellar Medium of NGC 4258

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+-0.02 and 0.59 +-0.01 keV, respectively. Suzaku's excellent spectral sensitivity enables 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), rather than Anders & Grevesse (1989). This suggests that the metal enrichment processes of NGC 4258 and of our Galaxy are similar.

9 pages, 4 figures

References in corpus (4)

• Neon and Argon optical emission lines in ionized gaseous nebulae: Implications and applications
• Type Ia and II supernovae contributions to the metal enrichment in intra-cluster medium observed with Suzaku
• The multi-phase gaseous halos of star forming late-type galaxies - II. Statistical analysis of key parameters
• The relation between star formation rate and accretion rate in LINERs

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• The Abundance Pattern of O, Ne, Mg, and Fe in the Interstellar Medium of S0 Galaxy NGC 4382 Observed with Suzaku