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NGC 4697 Optical Image
(Credit: Digital Sky Survey)

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NGC 4697
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NGC 4697:
Black Holes in Elliptical Galaxy Point to Wild Youth


NGC 4697
Credit: NASA/CXC/UVa/C.Sarazin et al.

Chandra's image of the elliptical galaxy NGC 4697 reveals diffuse hot gas dotted with many point-like sources. As in the elliptical galaxies, NGC 4649 and NGC 1553, the point-like sources are due to black holes and neutron stars in binary star systems. Material pulled off a normal star is heated and emits X-radiation as it falls toward its black hole or neutron star companion.

Black holes and neutron stars are the end state of the brightest and most massive stars. Chandra's detection of numerous neutron stars and black holes in this and other elliptical galaxies shows that these galaxies once contained many very bright, massive stars, in marked contrast to the present population of low-mass faint stars that now dominate elliptical galaxies.

An unusually large number of the binary star X-ray sources in NGC 4697 are in "globular star clusters," round balls of stars in the galaxy that contain about one million stars in a volume where typically only one would be found. This suggests that the extraordinarily dense environment of globular clusters may be a good place for black holes or neutron stars to capture a companion star.

The origin of the hot gas cloud enveloping the galaxy is not known. One possibility is that the gas lost by evaporation from normal stars- so-called stellar winds - is heated by these winds and by supernova explosions.

Fast Facts for NGC 4697:
Credit  NASA/CXC/UVa/C.Sarazin et al.
Scale  Image is 4 arcmin on a side.
Category  Normal Galaxies & Starburst Galaxies
Coordinates (J2000)  RA 12h 48m 35s | Dec -05° 47' 21"
Constellation  Virgo
Observation Dates  January 15-16, 2000
Observation Time  11 hours
Obs. IDs  784
Color Code  Intensity
Instrument  ACIS
Also Known As PGC 43276
Distance Estimate  About 40 million light years
Release Date  June 04, 2002