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Fig. 1.

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X-ray images of M 82 and line profiles in the three energy bands. (a) Mosaiced X-ray count image of the centre of M 82 in the O VII (0.55−0.60 keV) band by CCDs. The three representative RGS position angles are overlaid on the 80 arcsec cross-dispersion widths. The arrows indicate the dispersion direction in which the photons are scattered into the higher-energy side. The star and the solid line passing through it indicate the centre and disc of M 82 (Lester et al. 1990; Mayya et al. 2005). The continuum flux estimated using the 0.45−0.55 keV band is subtracted from the raw count image. (b), (c) Same as panel a, but in the O VIII Lyα (0.64−0.67 keV) and Fe-L (0.70−1.20 keV) bands. (d) Normalised count profiles projected onto the 138° dispersion axis in the 0.55−0.60 keV (O VII), 0.64−0.67 keV (O VIII), and 0.70−1.20 keV (dominated by Fe-L lines) bands. The angular offset is measured in reference to the star in panel a, where the positive side of the offset axis is the higher-energy part in diffracted spectra. (e), (f) Same as panel d, but along the dispersion axes of 296° and 319°, respectively.

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