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News Release Archive:

News Release 67 of 122

September 17, 2002 12:00 PM (EDT)

News Release Number: STScI-2002-18

Hubble Discovers Black Holes in Unexpected Places

Technical facts about this news release:

About the Object
Object Name: M15 (NGC 7078)
Object Description: Globular Cluster in the Milky Way Galaxy
Position (J2000): R.A. 21h 29m 58s
Dec. +12° 10' 00"
Constellation: Pegasus
Distance: M15's distance to Earth is about 32,600 light-years (10 kiloparsecs). Its distance to the galactic center of the Milky Way is about 34,000 light-years (10.4 kiloparsecs).
Dimensions: The image is about 59 arcseconds (2.8 parsecs or 9.2 light-years) in the horizontal dimension.
Masses: Mass of the black hole: 4,000 times the mass of the Sun
Mass of the globular cluster: 600,000 times the mass of the Sun
About the Data
Instrument: WFPC2 STIS
Exposure Date(s): December 1998 October 1999, May/October 2001
Exposure Time: 3.7 hours 16 hours
Principal Astronomers: H. E. Bond (STScI), D. R. Alves (Columbia Astrophysics Lab.), M. Livio, L. K. Fullton and K. G. Schaefer (STScI) R. Van Der Marel and J. Gerssen (STScI), K. Gebhardt (U. Texas at Austin), P. Guhathakurta and R. Peterson (UCO/Lick Observatory) and C. Pryor (Rutgers U.)
Filters: F439W (B), F547M (Strömgren y), F502N ([O III]), F656N (H alpha), F814W (I) G430M
About the Image
Image Credit: NASA and The Hubble Heritage Team (STScI/AURA)
Release Date: September 17, 2002
Orientation: Globular Cluster M15


About the Object
Object Name: G1 in M31 (Mayall II)
Object Description: Globular Cluster in the Andromeda Galaxy
Position (J2000): R.A. 00h 32m 46.9m
Dec. +39° 34' 42"
Constellation: Andromeda
Distance: G1's distance to Earth is about 2.2 million light-years (675,000 parsecs). Its distance to the galactic center of M31 is about 120,000 light-years (36.8 kiloparsecs).
Dimensions: The image is about 24 arcseconds (770 parsecs or 2500 light-years) in the horizontal dimension.
Masses: Mass of the black hole: 20,000 times the mass of the Sun
About the Data
Instrument: WFPC2 STIS
Exposure Date(s): July 1994 October - November 2001
Exposure Time: 1.9 hours 8.3 hours
Principal Astronomers: M. Rich (UCLA), K. Mighell (NOAO), and J. Neill (Columbia U.), and W. Freedman (Carnegie Observatories) G430L, G750M
Filters: F555W (V), F814W (I) M. Rich (UCLA), K. Gebhardt (U. Texas at Austin), and L. Ho (Carnegie Inst. of Washington)
About the Image
Image Credit: NASA and M. Rich (UCLA)
Release Date: September 17, 2002 12:00 noon (EDT)
Orientation: Globular Cluster M31 G1