Progress in studies of intergalactic He II absorption

Wei Zheng; S. F. Anderson; G. A. Kriss; K. Chiu; D. Haggard; D. P. Schneider; C. J. Hogan; D. G. York; S. Burles; A. Meiksin

doi:10.1017/S1743921305003169

Progress in studies of intergalactic He II absorption

Wei Zheng, S. F. Anderson, G. A. Kriss, K. Chiu, D. Haggard, D. P. Schneider, C. J. Hogan, D. G. York, S. Burles, A. Meiksin

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Abstract

Significant progress has been made in the last decade toward an understanding of the intergalactic He II absorption. At redshifts z < 2.8, individual absorbers are found to be ionised mainly by a hard quasar continuum, but their ionisation states vary considerably and the ionising radiation field may have contributions from a soft stellar continuum. The He II opacity increases significantly at z ∼ 2.8, suggesting a possible end of the general reionisation of intergalactic He II. Using the massive SDSS database and UV selection with HST and GALEX, we have found new quasars at z ≥ 3.5, with detected He II absorption. Future observations will pinpoint the epoch of reionisation of the intergalactic He II.

Original language	English (US)
Pages (from-to)	484-486
Number of pages	3
Journal	Proceedings of the International Astronomical Union
Volume	1
Issue number	C199
DOIs	https://doi.org/10.1017/S1743921305003169
State	Published - 2005

All Science Journal Classification (ASJC) codes

Medicine (miscellaneous)
Astronomy and Astrophysics
Nutrition and Dietetics
Public Health, Environmental and Occupational Health
Space and Planetary Science

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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abstract = "Significant progress has been made in the last decade toward an understanding of the intergalactic He II absorption. At redshifts z < 2.8, individual absorbers are found to be ionised mainly by a hard quasar continuum, but their ionisation states vary considerably and the ionising radiation field may have contributions from a soft stellar continuum. The He II opacity increases significantly at z ∼ 2.8, suggesting a possible end of the general reionisation of intergalactic He II. Using the massive SDSS database and UV selection with HST and GALEX, we have found new quasars at z ≥ 3.5, with detected He II absorption. Future observations will pinpoint the epoch of reionisation of the intergalactic He II.",

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T1 - Progress in studies of intergalactic He II absorption

AU - Zheng, Wei

AU - Anderson, S. F.

AU - Kriss, G. A.

AU - Chiu, K.

AU - Haggard, D.

AU - Schneider, D. P.

AU - Hogan, C. J.

AU - York, D. G.

AU - Burles, S.

AU - Meiksin, A.

PY - 2005

Y1 - 2005

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AB - Significant progress has been made in the last decade toward an understanding of the intergalactic He II absorption. At redshifts z < 2.8, individual absorbers are found to be ionised mainly by a hard quasar continuum, but their ionisation states vary considerably and the ionising radiation field may have contributions from a soft stellar continuum. The He II opacity increases significantly at z ∼ 2.8, suggesting a possible end of the general reionisation of intergalactic He II. Using the massive SDSS database and UV selection with HST and GALEX, we have found new quasars at z ≥ 3.5, with detected He II absorption. Future observations will pinpoint the epoch of reionisation of the intergalactic He II.

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Progress in studies of intergalactic He II absorption

Abstract

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