Detection of a Lyman-alpha Emission-Line Companion to the z=4.69 QSO BR1202-0725

Details Detection of a Lyman-alpha Emission-Line Companion to the z=4.69 QSO BR1202-0725 Detection of a Lyman-alpha Emission-Line Companion to the z=4.69 QSO BR1202-0725

1995-12-29

arxiv.org/abs/astro-ph/9512165v2

Astrophys.J. 459 (1996) L53-L55

Astronomy and Astrophysics

Astrophysics

12 pages LaTeX (aastex4.0 macros: aasms4.sty, flushrt.sty) plus 3 figures. To appear in the Astrophysical Journal Letters. Typ

Scientific paper

10.1086/309958

We report the detection of a nearby emission-line companion to the z=4.695 quasar BR1202-0725. Deep narrow-band exposures on this field from the UH 2.2 m show a Ly alpha flux of 1.5\times\ten{-16} ergs cm^{-2} s^{-1}. High-resolution HST WFC2 imaging in the F814W filter band shows continuum structure near the emission position, at 2.6" NW of the quasar, corresponding to a projected separation of ~7.5 h^{-1} kpc for \qnought=0.5, where h=\hnought/100\kms Mpc^{-1}. We discuss possible explanations for the combined line and color properties. The ionization is most likely produced by the quasar, but if due to underlying star formation would require a star formation rate of ~7 h^2 solar masses per yr.

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