Detection of a Lyα Emission-Line Companion to the [ITAL]z[/ITAL] = 4.69 Quasar BR 1202−0725 | Zendy

E. M. Hu | Zendy; R. G. McMahon | Zendy; Eiichi Egami | Zendy

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Detection of a Lyα Emission-Line Companion to the [ITAL]z[/ITAL] = 4.69 Quasar BR 1202−0725

Author(s) -

E. M. Hu,

R. G. McMahon,

Eiichi Egami

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309958

Subject(s) - quasar , physics , astrophysics , astronomy , emission spectrum , hubble space telescope , telescope , doubly ionized oxygen , flux (metallurgy) , stars , spectral line , galaxy , chemistry , organic chemistry

We report the detection of a nearby emission-line companion to the z=4.695quasar BR1202-0725. Deep narrow-band exposures on this field from the UH 2.2 mshow a Ly alpha flux of 1.5\times\ten{-16} ergs cm^{-2} s^{-1}. High-resolutionHST WFC2 imaging in the F814W filter band shows continuum structure near theemission position, at 2.6" NW of the quasar, corresponding to a projectedseparation of ~7.5 h^{-1} kpc for \qnought=0.5, where h=\hnought/100\kmsMpc^{-1}. We discuss possible explanations for the combined line and colorproperties. The ionization is most likely produced by the quasar, but if due tounderlying star formation would require a star formation rate of ~7 h^2 solarmasses per yr.Comment: 12 pages LaTeX (aastex4.0 macros: aasms4.sty, flushrt.sty) plus 3 figures. To appear in the Astrophysical Journal Letters. Typo in original submission ("2" should have been "7" in luminosity: 7e42 h^{-2} ergs and in the star formation rate: 7 h^{-2} \msun per yr). Resubmitted with figure

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