Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-31
Publ. Astron. Soc. Japan 61 (2009) S291-S298
Astronomy and Astrophysics
Astrophysics
8 pages, 11 figures, will be published in PASJ
Scientific paper
Suzaku observation of the edge-on spiral galaxy NGC 4631 confirmed its X-ray halo extending out to about 10 kpc from the galactic disk. The XIS spectra yielded the temperature and metal abundance for the disk and the halo regions. The observed abundance pattern for O, Ne, Mg, Si and Fe is consistent with the metal yield from type II supernovae, with an O mass of about 1E6 Msun contained in the halo. These features imply that metal-rich gas produced by type II supernova is brought into the halo region very effectively, most likely through a galactic wind. Temperature and metal abundance may be affected by charge exchange and dust. An upper limit for the hard X-ray flux was obtained, corresponding to a magnetic field higher than 0.5 uG.
Mitsuishi Ikuyuki
Ohashi Takaya
Sato Kosuke
Yamasaki Noriko Y.
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