SIMBAD references

2003A&A...397..891J - Astronomy and Astrophysics, volume 397, 891-898 (2003/1-3)

Caught in the act: A helium-reionizing quasar near the line of sight to Q0302-003.


Abstract (from CDS):

We report the discovery of a quasar at z=3.050±0.003, closely coincident in redshift with the isolated low-opacity feature seen near z≃3.056 in the otherwise black portion of the HeII Gunn-Peterson absorption trough seen toward the z=3.286 background quasar Q0302-003, located 6.5' away on the sky. We explore plausible models for the HeIII ionization zone created by this neighboring quasar and its interception with the line of sight toward Q0302-003. At its present brightness of V≃20.5 and separation of D{perpendicular}≃3.2Mpc, the quasar can readily account for the opacity gap in the HeII absorption spectrum of Q0302-003, provided it has been active for tQ>107y. This is the first clear example of the ``transverse'' proximity effect and the association of a quasar with its imprint on the intervening absorption detected along an adjacent line of sight.

Abstract Copyright:

Journal keyword(s): quasars: individual: QSO03020-0014, Q0302-003 - quasars: absorption lines - intergalactic medium

Nomenclature: [JJW2003] QSO HHMMm+DDMM N=2.

Simbad objects: 9

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