Statistical Detection of the He ii Transverse Proximity Effect: Evidence for Sustained Quasar Activity for >25 Million Years

The He ii transverse proximity effect-enhanced He ii transmission in a background sightline caused by the ionizing radiation of a foreground quasar-offers a unique opportunity to probe the morphology of quasar-driven He ii reionization. We conduct a comprehensive spectroscopic survey to find quasars...

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Veröffentlicht in:	The Astrophysical journal 2017-09, Vol.847 (1), p.81
Hauptverfasser:	Schmidt, Tobias M., Worseck, Gabor, Hennawi, Joseph F., Prochaska, J. Xavier, Crighton, Neil H. M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Alpha rays Astrophysics ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COMPUTERIZED SIMULATION dark ages, reionization, first stars DETECTION FLUCTUATIONS Hubble Space Telescope intergalactic medium Ionization Ionizing radiation IONIZING RADIATIONS MEAN FREE PATH Occultation PHOTOIONIZATION Proximity PROXIMITY EFFECT QUASARS quasars: general Radiation RED SHIFT Signal strength Sky surveys (astronomy) SPACE Space telescopes SPECTRA STARS Statistical analysis TELESCOPES Variation
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