HEAO 1 observations of 4U1232+07 [1] (multiple letters)

S. P. Bhavsar*, Melville P Ulmer, R. G. Cruddace, K. Wood, J. Meekins, D. Yentis, W. Evans, H. Smathers, E. T. Byram, T. A. Chubb, H. Friedman

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review


While performing an analysis of the NRL HEAO 1 observations of the Virgo cluster and 3C273, we detected X-ray emission from a region between these two objects. The most satisfactory explanation is the presence of two weak X-ray sources, for which we have obtained error boxes. One source is likely to be the peculiar galaxy IC3576, suggested by Margon et al.1 as the source 2U1231+07=4U1232+07 (ref. 2). The error box resulting from combining our observations with the 4U data strengthen the X-ray identification with this extremely interesting galaxy. There are numerous possibilities for the other X-ray source, and here we discuss one, the interacting pair of galaxies NGC4410a and NGC4410b (NGC4410a/b).

Original languageEnglish (US)
Pages (from-to)462-463
Number of pages2
Issue number5731
StatePublished - Dec 1 1979

ASJC Scopus subject areas

  • General


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