[Paper Review] Identification and properties of intense star-forming galaxies at redshifts z>10
The paper identifies four z~10–13 galaxies in JWST/JADES NIRCam imaging, with spectroscopically confirmed z>12 systems in a companion study, showing rapid, intense star formation in compact, young stellar populations.
Surveys with James Webb Space Telescope (JWST) have discovered candidate galaxies in the first 400 Myr of cosmic time. Preliminary indications have suggested these candidate galaxies may be more massive and abundant than previously thought. However, without confirmed distances, their inferred properties remain uncertain. Here we identify four galaxies located in the JWST Advanced Deep Extragalactic Survey (JADES) Near-Infrared Camera (NIRCam) imaging with photometric redshifts z~10-13. These galaxies include the first redshift z>12 systems discovered with distances spectroscopically confirmed by JWST in a companion paper. Using stellar population modelling, we find the galaxies typically contain a hundred million solar masses in stars, in stellar populations that are less than one hundred million years old. The moderate star formation rates and compact sizes suggest elevated star formation rate surface densities, a key indicator of their formation pathways. Taken together, these measurements show that the first galaxies contributing to cosmic reionisation formed rapidly and with intense internal radiation fields.
Motivation & Objective
- Motivate the study of early galaxy formation during the first 400 Myr of cosmic time.
- Identify z~10–13 galaxies in JWST/NIRCam imaging with robust photometric redshifts.
- Characterize stellar populations and star formation properties to assess reionization contribution.
- Compare properties with spectroscopically confirmed z>12 systems from a companion study.
Proposed method
- Photometric redshift estimation using JWST/NIRCam data.
- Stellar population modeling to derive stellar masses, ages, and star formation rates.
- Size estimation from imaging to determine compactness and surface densities.
- Synthesis of results to infer formation pathways and radiation field intensity.
Experimental results
Research questions
- RQ1What are the properties (mass, age, SFR, size) of the z>10 galaxy candidates identified in JWST/JADES?
- RQ2Do these galaxies exhibit elevated star formation rate surface densities indicative of rapid early growth?
- RQ3How do the photometrically inferred properties compare with spectroscopically confirmed z>12 systems?
- RQ4What do the properties imply about the role of such galaxies in cosmic reionization?
Key findings
- Four galaxies at photometric redshifts z~10–13 are identified in JWST/JADES NIRCam imaging.
- The galaxies typically contain about 1e8 solar masses in stars and are younger than 1e8 years.
- They exhibit moderate star formation rates and compact sizes, implying elevated star formation rate surface densities.
- A companion paper provides spectroscopic confirmation for the highest-z systems (z>12).
- Results support a picture of rapid formation and intense internal radiation fields in early galaxies.
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This review was created by AI and reviewed by human editors.