...1,

Present Adress: Radio Observatory, ASTRON, PO Box 2, 7990 AA Dwingeloo, The Netherlands.

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... nearby

D = 22.6 Mpc (assuming z = 0.0049, Knapp et al. 1978, andH₀ = 65 km s^-1 Mpc^-1). At this distance 1 arcsec corresponds to $\sim$110 pc.

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... 2000

The CHANDRA data were taken from the public archive (http://cxc.harvard.edu/cda/chaser.html) and analyzed using standard methods within the software package CIAO 3.0 using the calibration data base CALDB 2.2.5 version.

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... archive

http://www.merlin.ac.uk

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... index

The photon index $\Gamma$ is defined as the power-law index of the spectrum given in units of [photons s^-1 keV^-1]. It is related to the energy index $\alpha$, used in radio astronomy, via: $\Gamma = 1 - \alpha$.

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