dc.date.accessioned | 2019-01-08T13:20:38Z | |
dc.date.available | 2019-01-08T13:20:38Z | |
dc.date.created | 2018-10-30T14:27:22Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Chisholm, John Gazagnes, S Schaerer, Daniel Verhamme, Anne Rigby, Jane R. Bayliss, Matthew B. Sharon, Keren Gladders, Michael D. Dahle, Håkon . Accurately predicting the escape fraction of ionizing photons using rest-frame ultraviolet absorption lines. Astronomy and Astrophysics. 2018, 616 | |
dc.identifier.uri | http://hdl.handle.net/10852/66105 | |
dc.description.abstract | The fraction of ionizing photons that escape high-redshift galaxies sensitively determines whether galaxies reionized the early Universe. However, this escape fraction cannot be measured from high-redshift galaxies because the opacity of the intergalactic medium is large at high redshifts. Without methods to measure the escape fraction of high-redshift galaxies indirectly, it is unlikely that we will know what reionized the Universe. Here, we analyze the far-ultraviolet (UV) H I (Lyman series) and low-ionization metal absorption lines of nine low-redshift, confirmed Lyman continuum emitting galaxies. We use the H I covering fractions, column densities, and dust attenuations measured in a companion paper to predict the escape fraction of ionizing photons. We find good agreement between the predicted and observed Lyman continuum escape fractions (within 1.4σ) using both the H I and ISM absorption lines. The ionizing photons escape through holes in the H I, but we show that dust attenuation reduces the fraction of photons that escape galaxies. This means that the average high-redshift galaxy likely emits more ionizing photons than low-redshift galaxies. Two other indirect methods accurately predict the escape fractions: the Lyα escape fraction and the optical [O III]/[O II] flux ratio. We use these indirect methods to predict the escape fraction of a sample of 21 galaxies with rest-frame UV spectra but without Lyman continuum observations. Many of these galaxies have low escape fractions (fesc ≤ 1%), but 11 have escape fractions >1%. Future studies will use these methods to measure the escape fractions of high-redshift galaxies, enabling upcoming telescopes to determine whether star-forming galaxies reionized the early Universe.
© 2018 ESO | en_US |
dc.language | EN | |
dc.publisher | EDP Sciences | |
dc.title | Accurately predicting the escape fraction of ionizing photons using rest-frame ultraviolet absorption lines | en_US |
dc.title.alternative | ENEngelskEnglishAccurately predicting the escape fraction of ionizing photons using rest-frame ultraviolet absorption lines | |
dc.type | Journal article | en_US |
dc.creator.author | Chisholm, John | |
dc.creator.author | Gazagnes, S | |
dc.creator.author | Schaerer, Daniel | |
dc.creator.author | Verhamme, Anne | |
dc.creator.author | Rigby, Jane R. | |
dc.creator.author | Bayliss, Matthew B. | |
dc.creator.author | Sharon, Keren | |
dc.creator.author | Gladders, Michael D. | |
dc.creator.author | Dahle, Håkon | |
cristin.unitcode | 185,15,3,0 | |
cristin.unitname | Institutt for teoretisk astrofysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |
dc.identifier.cristin | 1624965 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy and Astrophysics&rft.volume=616&rft.spage=&rft.date=2018 | |
dc.identifier.jtitle | Astronomy and Astrophysics | |
dc.identifier.volume | 616 | |
dc.identifier.pagecount | 12 | |
dc.identifier.doi | http://dx.doi.org/10.1051/0004-6361/201832758 | |
dc.identifier.urn | URN:NBN:no-68617 | |
dc.type.document | Tidsskriftartikkel | en_US |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0004-6361 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/66105/1/aa32758-18.pdf | |
dc.type.version | PublishedVersion | |
cristin.articleid | A30 | |