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

Abstract

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 ksec. 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 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). The measured abundance pattern is compared with those of elliptical galaxies and an S0 galaxy, observed with Suzaku. Considering the metal-enrichment from present Type Ia supernovae, the near-solar abundance pattern of the ISM in NGC~1316 indicates an enhanced α/Fe ratio of stellar materials in the entire galaxy, like in giant elliptical galaxies.

10 pages, Accepted by PASJ

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Cited by in corpus (8)

• The Fornax Deep Survey with VST. II. Fornax A: a two-phase assembly caught on act
• The globular cluster system of NGC1316. I. Wide-field photometry in the Washington system
• The distance to NGC1316 (Fornax A): yet another curious case
• Suzaku Metal Abundance Patterns in the Outflow Region of M82 and the Importance of Charge Exchange
• Suzaku Observations of Metal Distributions in the Intracluster Medium of the Centaurus Cluster
• Suzaku Detection of Thermal X-Ray Emission Associated with the Western Radio Lobe of Fornax A
• Abundance Patterns in the Interstellar Medium of Early-type Galaxies Observed with Suzaku
• A multiwavelength view of the ISM in the merger remnant Fornax A galaxy