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Chandra X-ray Image of Galactic Center, Key Sources Labeled
(Credit: NASA/UMass/D.Wang et al.)

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DB01-42, DB00-58 & DB00-6:
Stars of Wonder, Stars of Infrared and X-ray Light


DB00-6
Credit: X-ray: NASA/CXC/Northwestern U./C.Law & F.Yusef-Zadeh; Infrared: 2MASS/UMass/IPAC-Caltech/NASA/NSF

This montage shows three clusters of bright, young stars in X-ray (blue) and infrared (green) light that lie in the direction of the center of the Galaxy. Like many stars in the disk of the Galaxy, they are difficult, if not impossible, to see with an optical telescope because of interstellar dust that blocks the visible light.

Infrared and X-ray data provide evidence for a large amount of dust and gas along the line of sight to the cluster, DB01-42. Invisible to optical telescopes, it is located near the Galactic Center, about 26,000 light years from Earth. Most of the stars in the image produce infrared radiation from their surfaces which have temperatures of several thousand degrees Celsius. The X-radiation from the two bright X-ray sources near the center of the cluster requires gas with temperatures of millions of degrees.

Such extremely hot gas may be due to the collision of stellar winds from two closely orbiting stars. The two bright X-ray sources in the image are likely close binary stars with high-speed stellar winds. The diffuse X-ray glow could be caused by the combined heating of gas in the cluster by winds from many stars.

The light from the stars in the two clusters, DB00-58 and DB00-6 show much less X-ray and infrared absorption. This lower absorption, which still blocks much of the visible light, indicates that these star clusters are not in the Galactic Center, but are foreground objects. The way in which the X-rays are produced in these clusters is likely to be similar to DB01-42.

Fast Facts for DB00-6:
Credit  X-ray: NASA/CXC/Northwestern U./C.Law & F.Yusef-Zadeh; Infrared: 2MASS/UMass/IPAC-Caltech/NASA/NSF
Scale  3.1 arcmin across.
Category  Normal Stars & Star Clusters, Milky Way Galaxy
Coordinates (J2000)  RA 17h 47m 9.40s | Dec -28° 46' 26"
Constellation  Sagittarius
Observation Dates  July 17, 2001
Observation Time  3 hours
Obs. IDs  2288
Color Code  Energy (X-ray: Blue; Infrared: Green)
Instrument  ACIS
References C. Law & F. Yusef-Zadeh, Astrophys. J. 611:858-870, 2004 August 20
Distance Estimate  Significantly less than 25,000 light years
Release Date  December 23, 2004
Fast Facts for DB01-42:
Credit  X-ray: NASA/CXC/Northwestern U./C.Law & F.Yusef-Zadeh; Infrared: 2MASS/UMass/IPAC-Caltech/NASA/NSF
Scale  4.2 arcmin across.
Category  Normal Stars & Star Clusters, Milky Way Galaxy
Coordinates (J2000)  RA 17h 44m 52.50s | Dec -29° 40' 48"
Constellation  Sagittarius
Observation Dates  July 20, 2001
Observation Time  6 hours
Obs. IDs  2270,2278
Color Code  Energy (X-ray: Blue; Infrared: Green)
Instrument  ACIS
References C. Law & F. Yusef-Zadeh, Astrophys. J. 611:858-870, 2004 August 20
Distance Estimate  25,000 light years
Release Date  December 23, 2004
Fast Facts for DB00-58:
Credit  X-ray: NASA/CXC/Northwestern U./C.Law & F.Yusef-Zadeh; Infrared: 2MASS/UMass/IPAC-Caltech/NASA/NSF
Scale  2.8 arcmin across.
Category  Normal Stars & Star Clusters, Milky Way Galaxy
Coordinates (J2000)  RA 17h 44m 59.90s | Dec -28° 51' 37"
Constellation  Sagittarius
Observation Dates  July 18, 2001
Observation Time  6 hours
Obs. IDs  2284,2287
Color Code  Energy (X-ray: Blue; Infrared: Green)
Instrument  ACIS
References C. Law & F. Yusef-Zadeh, Astrophys. J. 611:858-870, 2004 August 20
Distance Estimate  Significantly less than 25,000 light years
Release Date  December 23, 2004