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A Tour of NGC 2276
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(Credit: NASA/GSFC/T.Brown et al.)

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NGC 4631
NGC 4631
(07 Jul 01)
Closer Look Reveals Andromeda's Black Hole Not As "Cool" As Believed

Credit: X-ray: (NASA/SAO/CXC/M.Garcia et al.) Optical: (NASA/GSFC/T.Brown et al.)

Chandra and Hubble Space Telescope images of two recently detected emitting globular star clusters - so called because of their spherical shape - were used as a cross-check to determine the position of X-ray sources near the center of the Andromeda galaxy to an accuracy ten times greater than before. The inset shows the three Chandra sources closest to the supermassive black hole, overlaid with the intensity contours from the HST image (red). The location of supermassive black hole is thought to be in the middle of the peanut-shaped intensity contours, and very close to the Northern-most of the three Chandra sources.

These highly accurate positions show that the very cool X-ray source (blue) previously identified with the supermassive black hole in the center of the galaxy is actually about 10 light years south of the center. A second, hotter X-ray source, is found to be at a position consistent with the position of the super massive black hole. The globular clusters are outside the field of view in this image.

Fast Facts for M31:
Credit  X-ray: (NASA/SAO/CXC/M.Garcia et al.) Optical: (NASA/GSFC/T.Brown et al.)
Scale  Image is 1 arcmin across.
Category  Normal Galaxies & Starburst Galaxies, Black Holes
Coordinates (J2000)  RA 00h 40m 27s | Dec +40 40' 12
Constellation  Andromeda
Observation Dates  October 13, 1999
Observation Time  3 hours
Obs. IDs  303,305,306,307,308,311,312
Color Code  Cool blue dot - the rest is intensity
Instrument  ACIS
Also Known As Andromeda
Distance Estimate  2.5 million light years
Release Date  October 12, 2001