{"intvolume":"       918","language":[{"iso":"eng"}],"issue":"1","oa_version":"Published Version","main_file_link":[{"url":"https://doi.org/10.3847/1538-4357/ac0af6","open_access":"1"}],"quality_controlled":"1","scopus_import":"1","title":"Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization","keyword":["Space and Planetary Science","Astronomy and Astrophysics"],"date_published":"2021-08-27T00:00:00Z","article_type":"original","publisher":"American Astronomical Society","year":"2021","day":"27","publication_identifier":{"issn":["0004-637X"],"eissn":["1538-4357"]},"date_updated":"2023-08-21T11:44:50Z","volume":918,"extern":"1","type":"journal_article","publication":"The Astrophysical Journal","publication_status":"published","abstract":[{"text":"While most simulations of the epoch of reionization have focused on single-stellar populations in star-forming dwarf galaxies, products of binary evolution are expected to significantly contribute to emissions of hydrogen-ionizing photons. Among these products are stripped stars (or helium stars), which have their envelopes stripped from interactions with binary companions, leaving an exposed helium core. Previous work has suggested these stripped stars can dominate the Lyman Continuum (LyC) photon output of high-redshift, low-luminosity galaxies post-starburst. Other sources of hard radiation in the early universe include zero-metallicity Population iii stars, which may have similar spectral energy distribution (SED) properties to galaxies with radiation dominated by stripped-star emissions. Here, we use four metrics (the power-law exponent over wavelength intervals 240–500 Å, 600–900 Å, and 1200–2000 Å, and the ratio of total luminosity in FUV wavelengths to LyC wavelengths) to compare the SEDs of simulated galaxies with only single-stellar evolution, galaxies containing stripped stars, and galaxies containing Population iii stars, with four different initial mass functions (IMFs). We find that stripped stars significantly alter SEDs in the LyC range of galaxies at the epoch of reionization. SEDs in galaxies with stripped stars have lower power-law indices in the LyC range and lower FUV to LyC luminosity ratios. These differences in SEDs are present at all considered luminosities (${M}_{\\mathrm{UV}}\\gt -15$, AB system), and are most pronounced for lower-luminosity galaxies. Intrinsic SEDs as well as those with interstellar medium absorption of galaxies with stripped stars and Population iii stars are found to be distinct for all tested Population iii IMFs.","lang":"eng"}],"article_number":"5","_id":"13456","doi":"10.3847/1538-4357/ac0af6","author":[{"last_name":"Berzin","full_name":"Berzin, Elizabeth","first_name":"Elizabeth"},{"first_name":"Amy","full_name":"Secunda, Amy","last_name":"Secunda"},{"first_name":"Renyue","full_name":"Cen, Renyue","last_name":"Cen"},{"last_name":"Menegas","first_name":"Alexander","full_name":"Menegas, Alexander"},{"last_name":"Götberg","id":"d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d","full_name":"Götberg, Ylva Louise Linsdotter","first_name":"Ylva Louise Linsdotter","orcid":"0000-0002-6960-6911"}],"citation":{"short":"E. Berzin, A. Secunda, R. Cen, A. Menegas, Y.L.L. Götberg, The Astrophysical Journal 918 (2021).","mla":"Berzin, Elizabeth, et al. “Spectral Signatures of Population III and Envelope-Stripped Stars in Galaxies at the Epoch of Reionization.” <i>The Astrophysical Journal</i>, vol. 918, no. 1, 5, American Astronomical Society, 2021, doi:<a href=\"https://doi.org/10.3847/1538-4357/ac0af6\">10.3847/1538-4357/ac0af6</a>.","ama":"Berzin E, Secunda A, Cen R, Menegas A, Götberg YLL. Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization. <i>The Astrophysical Journal</i>. 2021;918(1). doi:<a href=\"https://doi.org/10.3847/1538-4357/ac0af6\">10.3847/1538-4357/ac0af6</a>","ieee":"E. Berzin, A. Secunda, R. Cen, A. Menegas, and Y. L. L. Götberg, “Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization,” <i>The Astrophysical Journal</i>, vol. 918, no. 1. American Astronomical Society, 2021.","ista":"Berzin E, Secunda A, Cen R, Menegas A, Götberg YLL. 2021. Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization. The Astrophysical Journal. 918(1), 5.","chicago":"Berzin, Elizabeth, Amy Secunda, Renyue Cen, Alexander Menegas, and Ylva Louise Linsdotter Götberg. “Spectral Signatures of Population III and Envelope-Stripped Stars in Galaxies at the Epoch of Reionization.” <i>The Astrophysical Journal</i>. American Astronomical Society, 2021. <a href=\"https://doi.org/10.3847/1538-4357/ac0af6\">https://doi.org/10.3847/1538-4357/ac0af6</a>.","apa":"Berzin, E., Secunda, A., Cen, R., Menegas, A., &#38; Götberg, Y. L. L. (2021). Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization. <i>The Astrophysical Journal</i>. American Astronomical Society. <a href=\"https://doi.org/10.3847/1538-4357/ac0af6\">https://doi.org/10.3847/1538-4357/ac0af6</a>"},"month":"08","date_created":"2023-08-03T10:11:24Z","article_processing_charge":"No","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa":1,"status":"public","external_id":{"arxiv":["2102.08408"]}}