X-ray emission from the field of the hyperluminous IRAS galaxy IRAS F15307+3252

A. C. Fabian, R. M. Cutri, H. E. Smith, C. S. Crawford, W. N. Brandt

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We report on a 20-ks observation of the z = 0.93 hyperluminous galaxy IRAS F15307+3252 with the ROSAT HRI. No X-ray source is detected at the position of F15307+3252 at an upper limit of -4 × 1043 erg s-1 . This is less than 2 × 10-4 of the bolometric luminosity of the object, and indicates either that the nucleus emits an unusually small fraction of its total power in X-rays, or that little of the nuclear X-ray flux is scattered into our line of sight by electrons. The lack of an X-ray detection around F15307+3252 also rules out it being at the centre of a cluster, such as is observed for IRAS P09104+4109. A weak, possibly extended, X-ray source is detected 13 arcsec south of the galaxy, spatially coincident with a clump of faint objects visible in a Keck Ks-band image of the field. This may be the core of a cluster near the line of sight to F15307+3252.

Original languageEnglish (US)
Pages (from-to)L95-L98
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - 1996

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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