X-ray emission from the field of the hyperluminous IRAS galaxy IRASF15307+3252
Open Access
- 1 December 1996
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 283 (3) , L95-L98
- https://doi.org/10.1093/mnras/283.3.L95
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 ∼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.Keywords
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