VLT narrow-band photometry in the Lyman continuum of two galaxies at z ∼ 3* limits to the escape of ionizing flux

A. K. Inoue*, I. Iwata, J. M. Deharveng, V. Buat, D. Burgarella

*この研究の対応する著者

研究成果: Article査読

60 被引用数 (Scopus)

抄録

We have performed narrow-band imaging observations with the Very Large Telescope, aimed at detecting the Lyman continuum (LC) flux escaping from galaxies at z ∼ 3. We do not find any significant LC flux from our sample of two galaxies in the Hubble Deep Field South, at z = 3.170 and 3.275. The corresponding lower limits on the F1400/F900 flux density (per Hz) ratio are 15.6 and 10.2 (3-σ confidence level). After correction for the intergalactic hydrogen absorption, the resulting limits on the relative escape fraction of the LC are compared with those obtained by different approaches, at similar or lower redshifts. One of our two objects has a relative escape fraction lower than the detection reported by Steidel et al. in a composite spectrum of z ∼ 3 galaxies. A larger number of objects is required to reach a significant conclusion. Our comparison shows the potential of narrow-band imaging for obtaining the best limit on the relative escape fraction at z ∼ 3. Stacking a significant number of galaxies observed through a narrow-band filter would provide constraint on the galactic contribution to the cosmic reionization.

本文言語English
ページ(範囲)471-482
ページ数12
ジャーナルAstronomy and Astrophysics
435
2
DOI
出版ステータスPublished - 2005 5
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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