We present BeppoSAX results on the nearby starburst galaxy NGC 253. Although extended, a large fraction of the X-ray emission comes from the nuclear region. Preliminary analysis of the LECS/MECS/PDS ∼ 0.2-60 keV data from the central 4′ region indicates that the continuum is well fitted by two thermal models: a "soft" component with kT ∼ 0.9 keV, and a "hard" component with kT ∼ 6 keV absorbed by a column density of ∼ 1.2 × 1022 cm-2. For the first time in this object, the FeK line at 6.7keV is detected, with an equivalent width of ∼ 300eV. This detection, together with the shape of the 2-60 keV continuum, implies that most of the hard X-ray emission is thermal in origin, and constrains the iron abundances of this component to be ∼ 0.25 of solar. Other lines clearly detected are Si, S and Fe L/Ne, in agreement with previous ASCA results. We discuss our results in the context of the starburst-driven galactic superwind model.
|Journal||Astronomy and Astrophysics|
|State||Published - 10 Nov 1998|
- Galaxies: individual: NGC 253
- Galaxies: spiral
- Galaxies: starburst