Lyman continuum leaking AGN in the SSA22 field

Genoveva Micheva*, Ikuru Iwata, Akio K. Inoue


研究成果: Article査読

30 被引用数 (Scopus)


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.

ジャーナルMonthly Notices of the Royal Astronomical Society
出版ステータスPublished - 2017 2月 11

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


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