henryahoff on 10-May-2013 15:49:06 GMT about NGC 7252
The current information on NGC 7252 does not indicate that it is an X-ray source. Here are two literature references that have detected X-rays coming from NGC 7252:
1. Observation with the X-ray satellite ASCA of "a nearby merger remnant NGC 7252 ... detected X-ray emission with the X-ray flux of (1.8 ± 0.3) x 10<sup>-13</sup> ergs s<sup>-1</sup> cm<sup>-2</sup> in the 0.5-10 keV band. ... hard X-ray emission ... may indicate the existence of nuclear activity or an intermediate-mass black hole in NGC 7252."
Hisamitsu Awaki, Hironori Matsumoto, and Hiroshi
Tomida, "X-Ray Emission from a Merger Remnant, NGC 7252 (the "Atoms-for-Peace" Galaxy)", The Astrophysical Journal, March 10, 2002, 567(2), 892-5, url=http://iopscience.iop.org/0004-637X/567/2/892.
2. "The ''ROSAT'' PSPC observations were obtained in 1992 December and 1993 January and amount to 17 381 s of data centered on NGC 7252.", J. E. Hibbard, Puragra Guhathakurta, J. H. van Gorkom, and François Schweizer, "Cold, Warm, and Hot Gas in the Late-Stage Merger NGC 7252", The Astronomical Journal, January 1994, 107(1), 67-89, bibcode:
1994AJ....107...67H
.
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