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#author("2025-04-07T01:22:42+00:00","default:wwwadm","wwwadm") #author("2025-04-07T01:25:35+00:00","default:wwwadm","wwwadm") [[IoA_Seminar]] #contents * 講演リスト [#g8648f7a] ** No. 429: April 17, 2025 (Thu) 15:30-16:30 [#dad05fe7] *** Place: Institute of Astronomy, Lecture Room / Zoom (hybrid) [#va7fc746] *** Place: Lecture Room, Institute of Astronomy, University of Tokyo / Zoom (hybrid) [#va7fc746] *** Speaker: Eduardo Ibar (Universidad de Valparaíso) [#d2a6b465] *** Title: The properties of emitting line galaxies discovered by the JWST Emission Line Survey (JELS) [#kf065e92] Language: English Abstract: Recombination lines are some of the best star-formation indicators in the nearby Universe. Previous surveys have mapped the evolution of H-alpha emitters out to the peak star-formation epoch at z~2. Beyond this redshift, samples of star-forming galaxies and estimates of the cosmic star-formation rate density are almost ubiquitously based on rest-frame UV. We exploit the JWST NIRCam's narrow-band filters to observe a 65 sq. arcmin in the well-studied COSMOS field, to characterise different emitting-line galaxy populations. Using difference imaging between the closely-spaced narrow and broad band filters, we find line emitters over different redshift slices, including Pa-alpha at z~1-5, Paschen-beta at z~2.6, , H-alpha at z~2.3 & 6.1, and [OIII] at z~8.1. JELS provides the first critical test for producing a clean, emission-line selected sample of galaxies into the Epoch of Reionization. Using JWST's remarkable angular resolution we measure the ionised gas structures of these galaxies at sub-kpc resolution and determine how the relationship between UV and ionised gas structures varies with host galaxy properties. Special emphasis is given to the exploration of the Paschen emitters, which provide an unobscured view at the peak of the cosmic star-formation rate density. ---------------------------------------------------------------
