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Chandra Observations of the Nucleus of M33

Guillaume Dubus·Robert E. Rutledge
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Abstract

The nearby galaxy M33 hosts the most luminous steady X-ray source in the Local Group. The high spatial resolution of Chandra allows us to confirm that this ultra-luminous X-ray source is within the nucleus and rule out at the 4.6 sigma level a previously proposed possible counterpart located 1" away. The X-ray spectrum is well fitted by a disc blackbody with kT=1.18+-0.02 keV and R cos(theta)^(0.5}=57+-3 km, consistent with earlier results from ASCA and BeppoSAX. The source flux is steady between 1 and 1e4 s (<3% rms variability, 0.5-10 keV) with a 0.5-10 keV luminosity of 1.5e39 erg/s. The X-ray properties and an association with a radio source are reminiscent of the galactic microquasar GRS 1915+105.

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Guillaume Dubus, Robert E. Rutledge. 2002-07-02. Chandra Observations of the Nucleus of M33. https://doi.org/10.1046/j.1365-8711.2002.05827.x

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