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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

소형, 별 형성 난장이 은하계에서8% 부족한 리만 연속체 광자

Eight per cent leakage of Lyman continuum photons from a compact, star-forming dwarf galaxy
  • 작성자 : KASI
  • 작성일 : 2016-01-18
  • 조회수 : 2318
  • 저자Y. I. Izotov, I. Orlitová, D. Schaerer et al.,
  • Absract

     

     

    One of the key questions in observational cosmology is the identification of the sources responsible for ionization of the Universe after the cosmic ‘Dark Ages’, when the baryonic matter was neutral. The currently identified distant galaxies are insufficient to fully reionize the Universe by redshift z ≈ 6, but low-mass, star-forming galaxies are thought to be responsible for the bulk of the ionizing radiation. As direct observations at high redshift are difficult for a variety of reasons, one solution is to identify local proxies of this galaxy population. Starburst galaxies at low redshifts, however, generally are opaque to Lyman continuum photons. Small escape fractions of about 1 to 3 per cent, insufficient to ionize much surrounding gas, have been detected only in three low-redshift galaxies. Here we report far-ultraviolet observations of the nearby low-mass star-forming galaxy J0925+1403. The galaxy is leaking ionizing radiation with an escape fraction of about 8 per cent. The total number of photons emitted during the starburst phase is sufficient to ionize intergalactic medium material that is about 40 times as massive as the stellar mass of the galaxy.

     


  • 게재정보NATURE(2016.01.14)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v529/n7585/pdf/nature16456.pdf
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