Lyman continuum leaking AGN in the SSA22 field

Genoveva Micheva*, Ikuru Iwata, Akio K. Inoue

*この研究の対応する著者

研究成果: Article査読

30 被引用数 (Scopus)

抄録

Subaru/SuprimeCam narrow-band photometry of the SSA22 field reveals the presence of four Lyman continuum (LyC) candidates among a sample of 14 active galactic nuclei (AGNs). Two show offsets and likely have stellar LyCin nature or are foreground contaminants. The remaining two LyC candidates are type I AGN.We argue that the average LyC escape fraction of high-redshift, low-luminosityAGNis not likely to be unity, as often assumed in the literature. From direct measurement we obtain the average LyC-to-UV flux density ratio and ionizing emissivity for a number of AGN classes and find it at least a factor of 2 lower than values obtained assuming fesc = 1. Comparing to recent Ly α forest measurements, AGNs at redshift z ~ 3 make up at most ~12 per cent and as little as ~5 per cent of the total ionizing budget. Our results suggest that AGNs are unlikely to dominate the ionization budget of the Universe at high redshifts.

本文言語English
ページ(範囲)302-315
ページ数14
ジャーナルMonthly Notices of the Royal Astronomical Society
465
1
DOI
出版ステータスPublished - 2017 2月 11
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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