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March 12, 2026
Dear all,
Please join us for a Cake Talk Thursday, March 12th at 14:00.
The speaker is Yi Ren, Phd student at Waseda University, Tokyo, Japan.Yi will be visiting all week for anyone that would like to talk more with her.
Title: Research on physical properties of a young starburst galaxy in the early Universe with JWST and ALMA telescopes
Abstract:
JWST follow-up observations of ALMA-detected galaxies in the epoch of reionization are essential for characterizing their physical properties. In this talk, I will mainly present JWST NIRCam and NIRSpec studies of a galaxy at z = 7.212, SXDF-NB1006-2, from which the FIR [O III] and [C II] emission has ever been detected by ALMA. This galaxy is confirmed to have extremely young stellar populations (age ~ 2 Myr), bursty star formation activities, ionized gas outflows and potential old stellar populations. The studies of this galaxy provide key insights into our understanding of early galaxy formation and evolution. Including this target, the ALMA-detected galaxies at z>6 are generally very young but more massive and brighter in rest-frame UV than galaxies identified by only JWST. It suggests that the ALMA-detected galaxies may have experienced more efficient mass assembly processes in their evolutionary histories. SXDF-NB1006-2 may also be at an intermediate stage along the broader galaxy formation and evolution pathways at z>6. Thus, its properties, such as extremely young stellar age, presence of potential old stellar populations and high [O III]/[C II] luminosity ratio, may be representative of the typical properties of galaxies at the same evolutionary phase.
JWST follow-up observations of ALMA-detected galaxies in the epoch of reionization are essential for characterizing their physical properties. In this talk, I will mainly present JWST NIRCam and NIRSpec studies of a galaxy at z = 7.212, SXDF-NB1006-2, from which the FIR [O III] and [C II] emission has ever been detected by ALMA. This galaxy is confirmed to have extremely young stellar populations (age ~ 2 Myr), bursty star formation activities, ionized gas outflows and potential old stellar populations. The studies of this galaxy provide key insights into our understanding of early galaxy formation and evolution. Including this target, the ALMA-detected galaxies at z>6 are generally very young but more massive and brighter in rest-frame UV than galaxies identified by only JWST. It suggests that the ALMA-detected galaxies may have experienced more efficient mass assembly processes in their evolutionary histories. SXDF-NB1006-2 may also be at an intermediate stage along the broader galaxy formation and evolution pathways at z>6. Thus, its properties, such as extremely young stellar age, presence of potential old stellar populations and high [O III]/[C II] luminosity ratio, may be representative of the typical properties of galaxies at the same evolutionary phase.
Zoom link: https://ucph-ku.zoom.us/j/68050023091?pwd=sLAijLbCQPE5MnDEBQLLlSlSUKOkyz.1
Meeting ID: 680 5002 3091 // Passcode: 505555
Meeting ID: 680 5002 3091 // Passcode: 505555
Cheers,
Mikkel
