Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.283l..95f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 283, Issue 3, pp. l95-l98.
Astronomy and Astrophysics
Astronomy
21
Galaxies: Individual: Iras F15307+3252, Infrared: Galaxies, X-Rays: Galaxies.
Scientific paper
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.
Brandt Wiliam N.
Crawford Carolin S.
Cutri Roc M.
Fabian Andrea C.
Smith Harding E.
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