X-ray emission from the field of the hyperluminous IRAS galaxy IRASF15307+3252

December 1996 • 1996MNRAS.283L..95F

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

Abstract • 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 ~4x10^43ergss^-1. This is less than 2x10^-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 K_s-band image of the field. This may be the core of a cluster near the line of sight to F15307+3252.

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