The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters
The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters
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DOI：
10.3847/1538-4365/ac5331
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发表时间：
2022-01
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通讯作者：
S. Flury;A. Jaskot;H. Ferguson;G. Worseck;Kirill Makan;J. Chisholm;A. Saldana-Lopez;D. Schaerer;Stephan McCandless;Bingjie Wang;N. Ford;T. Heckman;Z. Ji;M. Giavalisco;R. Amorín;H. Atek;J. Blaizot;S. Borthakur;C. Carr;M. Castellano;S. Cristiani;S. D. Barros;M. Dickinson;S. Finkelstein;B. Fleming;F. Fontanot;T. Garel;A. Grazian;M. Hayes;A. Henry;V. Mauerhofer;G. Micheva;M. Oey;G. Ostlin;C. Papovich;L. Pentericci;S. Ravindranath;J. Rosdahl;M. Rutkowski;P. Santini;C. Scarlata;H. Teplitz;T. Thuan;M. Trebitsch;E. Vanzella;A. Verhamme;Xinfeng Xu University of Massachusetts Amherst;Williams College;Space Telescope Science Institute;U. Potsdam;U. T. A. Austin;U. Geneva;J. University;Universidad de La Serena;Sorbonne Universit'e;U. Lyon;A. S. University;U. Minnesota;Oss. Astronomico di Roma;Osservatorio astronomico di Trieste;NOIRLab;Laboratory for Atmospheric;S. Physics;Osservatorio Astronomico di Padova;S. University;Leibniz Institute for Astrophysics Potsdam;U. Michigan;AM Texas;M. S. University;C. Tech;U. Virginia;K. Institute;Osservatoria Astronomico di Bologna
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作者：
S. Flury;A. Jaskot;H. Ferguson;G. Worseck;Kirill Makan;J. Chisholm;A. Saldana-Lopez;D. Schaerer;Stephan McCandless;Bingjie Wang;N. Ford;T. Heckman;Z. Ji;M. Giavalisco;R. Amorín;H. Atek;J. Blaizot;S. Borthakur;C. Carr;M. Castellano;S. Cristiani;S. D. Barros;M. Dickinson;S. Finkelstein;B. Fleming;F. Fontanot;T. Garel;A. Grazian;M. Hayes;A. Henry;V. Mauerhofer;G. Micheva;M. Oey;G. Ostlin;C. Papovich;L. Pentericci;S. Ravindranath;J. Rosdahl;M. Rutkowski;P. Santini;C. Scarlata;H. Teplitz;T. Thuan;M. Trebitsch;E. Vanzella;A. Verhamme;Xinfeng Xu University of Massachusetts Amherst;Williams College;Space Telescope Science Institute;U. Potsdam;U. T. A. Austin;U. Geneva;J. University;Universidad de La Serena;Sorbonne Universit'e;U. Lyon;A. S. University;U. Minnesota;Oss. Astronomico di Roma;Osservatorio astronomico di Trieste;NOIRLab;Laboratory for Atmospheric;S. Physics;Osservatorio Astronomico di Padova;S. University;Leibniz Institute for Astrophysics Potsdam;U. Michigan;AM Texas;M. S. University;C. Tech;U. Virginia;K. Institute;Osservatoria Astronomico di Bologna
负责宇宙再电离的莱曼连续体（LyC）光子的起源至今仍是未知的，而且争议很大。由于星系间介质的吸收，从再电离时代探测LyC光子是不可能的，这促使了几种间接诊断的发展，通过研究低红移类似物来推断星系贡献LyC光子使宇宙再电离的速率。我们提出了低红移莱曼连续巡天（LzLCS），包括用哈勃太空望远镜宇宙起源光谱仪对66个星系的z = 0.2-0.4样本进行的测量。经过对远紫外光谱的仔细处理，我们共检测到35个Lyman连续发射体（lce），置信度为97.725%，几乎是已知局部lce数量的三倍。我们从检测到的LyC通量和未检测到的LyC通量的上限估计了逃逸分数，发现LyC逃逸分数的范围高达50%。在35个LzLCS lce中，有12个lce的LyC逸出分数大于5%，是已知具有宇宙学相关LyC逸出的lce数量的两倍多。
The origins of Lyman continuum (LyC) photons responsible for the reionization of the universe are as of yet unknown and highly contested. Detecting LyC photons from the Epoch of Reionization is not possible due to absorption by the intergalactic medium, which has prompted the development of several indirect diagnostics to infer the rate at which galaxies contribute LyC photons to reionize the universe by studying lower-redshift analogs. We present the Low-redshift Lyman Continuum Survey (LzLCS) comprising measurements made with the Hubble Space Telescope Cosmic Origins Spectrograph for a z = 0.2–0.4 sample of 66 galaxies. After careful processing of the far-UV spectra, we obtain a total of 35 Lyman continuum emitters (LCEs) detected with 97.725% confidence, nearly tripling the number of known local LCEs. We estimate escape fractions from the detected LyC flux and upper limits on the undetected LyC flux, finding a range of LyC escape fractions up to 50%. Of the 35 LzLCS LCEs, 12 have LyC escape fractions greater than 5%, more than doubling the number of known local LCEs with cosmologically relevant LyC escape.