An X-ray View of Star Formation in the Central 3kpc of NGC 2403

Astronomy and Astrophysics – Astronomy

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Scientific paper

We investigate the X-ray emission in the central 6 kpc region of the late-type spiral galaxy NGC 2403 and compare it to GALEX UV, KPNO Halpha, and Spitzer mid-IR data. The soft X-ray diffuse emission is, in general, associated with intense star-forming regions and is likely to have originated from shock-induced gas via stellar winds and supernovae. We constrain the masses and ages of these star-forming regions by fitting stellar synthesis models to the UV and IR photometry. NGC 2403 also shows a substantial amount of extended X-ray diffuse emission uncorrelated with HII or star-forming regions. This residual gas has a temperature of 2 to 3 MK, similar to the hot gas in the star-forming regions. It may be an extra-planar remnant from past outflow events or gas confined to the disk, either lingering after local star-formation has ended or venting into a porous ISM from active star-forming regions.

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