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DTSTART;TZID=UTC:20260519T133000
DTEND;TZID=UTC:20260519T141500
DTSTAMP:20260519T014823
CREATED:20260518T111837Z
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UID:9691-1779197400-1779200100@cassa.site
SUMMARY:Journal Talk 19: Imtiaz et al. (2026 (expected))
DESCRIPTION:Resolved Metallicity and Age Gradients in the Lensed Quiescent Galaxy AGEL0014 at z ≈ 1.4. \n[Based on research done under supervision of Dr. Nicha Leethochawalit\, Researcher at National Astronomical Research Institute of Thailand (NARIT)] \nAbstract: The formation and quenching mechanisms of massive galaxies at high redshift remain a focal point of galaxy evolution studies. We present a spatially resolved stellar population analysis of the lensed quiescent galaxy AGEL0014 (z ≈ 1.4) to constrain its formation history. Combining HST (F814W )\, Gemini/GSAOI (H\, J\, Ks)\, and Keck/MOSFIRE (J\,Y ) data\, we modeled the system using Lenstronomy. To robustly recover intrinsic stellar population trends given the seeing (≈ 0.4′′)\, we forward-modeled source plane metallicity gradients\, applying light-weighting and PSF convolution to the projected image-plane map to simulate slit data. Full spectrum fitting with the alf (Absorption Line Fitter) code reveals a clear positive age gradient and a negative metallicity gradient. The central region exhibits log(Age/Gyr) = 0.37 ± 0.05 and [Z/H] = −0.31 ± 0.11\, while the outer region hosts an older population with log(Age/Gyr) = 0.49 ± 0.07 and [Z/H] = −0.53 ± 0.10. Interestingly\, [Fe/H] increases from 0.01 ± 0.11 in the core to 0.19 ± 0.10 in the periphery. These signatures support an outside-in quenching scenario: the high α-enrichment in the core suggests it formed in a short\, intense burst and quenched abruptly\, whereas the iron-rich outskirts imply a more extended star formation history allowing for enrichment from Type Ia progenitors. \nLink: https://docs.google.com/presentation/d/1plgX7tQJdRSfYA3rwAsktoAbKSD9Am6z/edit?usp=sharing \nPresenter: Ahmad Al-Imtiaz (Graduate Research Assistant at CASSA; M.Sc. in Physics from Shahjalal University of Science & Technology) \n\nTo get notified\, subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-19/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
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