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Date and Time of the Query: 2018-11-17 T08:59:30 PST
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For refcode 1993AJ....106.1354W:
Retrieve 58 NED objects in this reference.
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1993AJ....106.1354W HUBBLE SPACE TELESCOPE DISCOVERY OF CANDIDATE YOUNG GLOBULAR CLUSTERS IN THE MERGER REMNANT NGC 7252 BRADLEY C. WHITMORE Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218 Electronic mail: whitmore@stsci.edu FRANCOIS SCHWEIZER Carnegie Institution of Washington, Department of Terrestrial Magnetism, 5241 Broad Branch Road, NW, Washington, DC 20015 Electronic mail: schweizer@bmrt.ciw.edu CLAUS LEITHERER, KIRK BORNE, AND CARMELLE ROBERT Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218 Electronic mail: leitherer@stsci.edu, home@stsci.edu, robert@stsci.edu Received 1993 June 9; revised 1993 July 1 ABSTRACT New, high-resolution images of the central region of NGC 7252 obtained with the Planetary Camera of the Hubble Space Telescope are presented. NGC 7252 (sometimes referred to as the "Atoms-for-Peace" Galaxy) is a prototypical example of a remnant of two merged disk galaxies. Our most striking result is the discovery of a population of about 40 blue pointlike objects in this galaxy. The mean absolute magnitude of these objects is M_V_ = -13 mag; the mean color is V-I = 0.7 mag; and the mean effective radius is 10 pc (for H_0_ = 50 km s^-1^ Mpc^-1^). The luminosities, colors, projected spatial distribution, and sizes are all compatible with the hypothesis that these objects formed within the last 1 Gyr following the collision of two spiral galaxies, and that they are young globular clusters. It therefore appears that the number of globular clusters may increase during the merger of gas-rich galaxies. This weakens van den Bergh's objection against ellipticals being formed through disk mergers, based mainly on the fact that disk galaxies have fewer globular clusters per unit luminosity than ellipticals do. Other findings are: (1) NGC 7252 shows a single, semistellar nucleus; (2) relatively bright spiral structure is seen within 3.5"(1.6 kpc) of the center, presumably formed through the continued infall of gas into a disk around the center of the galaxy; (3) dust lanes and very weak spiral structure are seen out to about 9" (4.2 kpc), primarily on the NE side; and (4) a ripple is found on the west side, 5.0" from the center.
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