2008 June 27
M81: Feeding a Black Hole Credit: X-ray: NASA/CXC/Wisconsin/D.Pooley & CfA/A.Zezas;
Optical: NASA/ESA/CfA/A.Zezas;UV: NASA/JPL-Caltech/CfA/J.Huchra et al.;IR: NASA/JPL-Caltech/CfAThis impressivecolor compositeshows spiral galaxy M81 across theelectromagnetic spectrum.It combines X-ray data (blue) from theChandraObservatory,infrared data (pink) from theSpitzer Space Telescope, andan ultraviolet image (purple) from theGALEX satellite,with a visible light (green)Hubble image.The inset highlights X-rays from some of M81′s black holes,includingblackholes in binary star systems with about10 times the mass of the sun, as well as the central,supermassive black hole of over 70 millionsolar masses.Comparing computer models of the giant black hole’s energyoutput to themultiwavelength datasuggests that feeding thatmonsteris relatively simple — energy and radiation is generatedas material in the central region swirls inwards forming anaccretion disk.In fact, the process otherwise appears to be just like theaccretion process feeding M81′s stellar mass black holes,even though the central black hole is millions of times more massive.M81 itself is about70,000 light-years across and only 12 millionlight-years away in the northern constellationUrsa Major.light-weekend%7Cutmcsr%3Dhttp%3A%2F%2Fantwrp%2Egsfc%2Enasa%2Egov%2Fapod%2Fastropix%2Ehtml%7Cutmcmd%3Drss%3B%2B)

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