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The Chandra data are shown in blue and the optical data from the VLT are colored gold. The point sources in the X-ray image are mostly binary stars containing gas that is being pulled from a star to a stellar-mass black hole or a neutron star. The inset features the central portion of the Chandra image, with the black hole located in the middle. No point source is seen at the position of the black hole, but instead a plateau of X-ray emission coming from both hot gas and the combined X-ray emission from unresolved binary stars is found.
To detect the black hole's effects, astronomers subtracted the X-ray signal from binary stars from that of the hot gas in the galaxy's center. Then, by studying the hot gas at different distances from the black hole, astronomers observed a critical threshold: where the motion of gas first becomes dominated by the supermassive black hole's gravity and falls inwards. The distance from the black hole where this occurs is known as the "Bondi radius."
As gas flows toward a black hole it becomes squeezed, making it hotter and brighter, a signature now confirmed by the X-ray observations. The researchers found the rise in gas temperature begins at about 700 light years from the black hole, giving the location of the Bondi radius. This suggests that the black hole in the center of NGC 3115 has a mass of about two billion times that of the Sun, supporting previous results from optical observations. This would make NGC 3115 the nearest billion-solar-mass black hole to Earth.
Credit X-ray: NASA/CXC/Univ. of Alabama/K.Wong et al, Optical: ESO/VLT
Scale Full image: 7.5 arcmin across (about 70,000 light years) | Inset image: 27 arcsec across (about 4,150 light years)
Category: Black Holes, Normal Galaxies & Starburst Galaxies
Coordinates: (J2000) RA 10h 05m 13.80s | Dec -07° 43' 09.00''
Observation Date: 3 pointings between June 14, 2001 and Jan 29, 2011
Observation Time: 43 hours 6 min (1 day 19 hours 6 min)
Obs. ID: 2040, 11268, 12095
Color Code: X-ray (Blue); Optical (Gold)
References: Wong, K., et al, 2011, ApJ 736L:23W, arXiv:1106.3069
Distance Estimate: About 32 million light years