News Release Archive:

News Release 374 of 1051

April 2, 2008 09:00 AM (EDT)

News Release Number: STScI-2008-14

Astronomers Find Suspected Medium-Size Black Hole in Omega Centauri

Technical facts about this news release:

About the Object
Object Name: Omega Centauri, NGC 5139
Object Description: Globular Star Cluster
Position (J2000): R.A. 13h 26m 45s.9
Dec. -47° 28' 37"
Constellation: Centaurus
Distance: 17,300 light-years or 5,300 parsecs
Dimensions: The image is approximately 50 light-years (15.3 parsecs) wide, subtending 10 arcminutes.
About the Data
Data Description: The Hubble image was created using HST data from proposal 9442: A. Cool (San Francisco State University), J. Anderson (STScI), D. Bailyn (Yale University), J. Carlin (San Francisco State University), P. Edmonds (Harvard-Smithsonian Center for Astrophysics), J. Grindlay (Harvard University), and D. Haggard (University of Washington)
Instrument: ACS WFC
Exposure Date(s): June 27-30, 2002
Exposure Time: 5 hours total, 34 minutes in each of nine overlapping fields
Filters: F435W (B) and F625W (SDSS r)
About the Image
Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
Release Date: April 2, 2008
Color The image is a composite of several separate exposures made by the ACS instrument on the Hubble Space Telescope. Two filters were used to sample broad wavelength ranges in the yellow and near infrafed. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:
F435W (B) blue
B + r green
F625W (SDSS r) red