Chandra Observations of the Nucleus of M33

Details Chandra Observations of the Nucleus of M33 Chandra Observations of the Nucleus of M33

2002-07-02

arxiv.org/abs/astro-ph/0207069v1

Mon.Not.Roy.Astron.Soc. 336 (2002) 901

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05827.x

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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