Multiple emission lines of H$α$ emitters at $z \sim 2.3$ from the broad and medium-band photometry in the ZFOURGE Survey
Rattachement africain : jp, au, us. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
We present a multiple emission lines study of $\sim$1300 H$α$ emitters (HAEs) at $z \sim 2.3$ in the ZFOURGE survey. In contrast to the traditional spectroscopic method, our sample is selected based on the flux excess in the ZFOURGE-$K_s$ broad-band data relative to the best-fit stellar continuum. Using the same method, we also extract the strong diagnostic emission lines for these individual HAEs: [OIII]$λ\lambda4959,5007$, [OII]$λ\lambda3726,3729$. Our measurements exhibit good consistency with those obtained from spectroscopic surveys. We investigate the relationship between the equivalent widths (EWs) of these emission lines and various galaxy properties, including stellar mass, stellar age, star formation rate (SFR), specific SFR (sSFR), ionization states (O32). We have identified a discrepancy between between HAEs at $z\sim2.3$ and typical local star-forming galaxy observed in the SDSS, suggesting the evolution of lower gas-phase metallicity ($Z$) and higher ionization parameters ($U$) with redshift. Notably, we have observed a significant number of low-mass HAEs exhibiting exceptionally high $EW_{\mathrm{[OIII]}}$. Their galaxy properties are comparable to those of extreme objects, such as extreme O3 emitters (O3Es) and Ly$α$ emitters (LAEs) at $z\simeq2-3$. Considering that these characteristics may indicate potential strong Lyman continuum (LyC) leakage, higher redshift anaglogs of the low-mass HAEs could be significant contributors to the cosmic reionization. Further investigations on this particular population are required to gain a clearer understanding of galaxy evolution and cosmic reionization.
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National Astronomical Observatory of Japan pays non établi dans la noticeStructure de recherche
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The University of Tokyo pays non établi dans la noticeUniversité ou école supérieure
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The Graduate University for Advanced Studies pays non établi dans la noticeUniversité ou école supérieure
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Macquarie University pays non établi dans la noticeUniversité ou école supérieure
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Carnegie Observatories pays non établi dans la noticeStructure de recherche
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Tohoku University Astronomical Institute pays non établi dans la noticeUniversité ou école supérieure
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Graduate School of Science Department of Astronomy pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Science and Engineering Australian Astronomical Optics pays non établi dans la noticeUniversité ou école supérieure
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School of Mathematical and Physical Sciences pays non établi dans la noticeUniversité ou école supérieure
National Astronomical Observatory of Japan, The University of Tokyo et The Graduate University for Advanced Studies, avec 7 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.