Imaan E. B. Wallace
A5084043815- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- Real-time simulation and control systems
University of Oxford
2022-2024
We present JADES JWST/NIRSpec spectroscopy of GN-z11, the most luminous candidate z > 10 Lyman break galaxy in GOODS-North field with M UV = −21.5. derive a redshift 10.603 (lower than previous determinations) based on multiple emission lines our low and medium resolution spectra over 0.7 − 5.3 μm. significantly detect continuum measure blue rest-UV spectral slope β −2.4. Remarkably, we see spatially extended Lyman- α (despite highly neutral intergalactic expected at this early epoch),...
We analyse the chemical properties of three z~8 galaxies behind galaxy cluster SMACS J0723.3-7327, observed as part Early Release Observations programme James Webb Space Telescope (JWST). Exploiting [O III]4363 auroral line detections in NIRSpec spectra, we robustly apply direct Te method for very first time at such high redshift, measuring metallicities ranging from extremely metal poor (12+log(O/H)~7) to about one-third solar. also discuss excitation these sources, and compare them with...
Abstract JWST has revolutionized the field of extragalactic astronomy with its sensitive and high-resolution infrared view distant Universe. Adding to new legacy observations, we present first NIRCam imaging data release from Advanced Deep Extragalactic Survey (JADES), providing nine filters ∼25 arcmin 2 covering Hubble Ultra Field portions Great Observatories Origins South. Utilizing 87 on-sky dual-filter hours exposure time, these images reveal deepest ever near-infrared this iconic field....
We present JADES JWST/NIRSpec spectroscopy of GN-z11, the most luminous candidate $z>10$ Lyman break galaxy in GOODS-North field with $M_{UV}=-21.5$. derive a redshift $z=10.603$ (lower than previous determinations) based on multiple emission lines our low and medium resolution spectra over $0.8-5.3 μ$m. significantly detect continuum measure blue rest-UV spectral slope $β=-2.4$. Remarkably, we see spatially-extended Lyman-$α$ (despite highly-neutral IGM expected at this early epoch),...
We present an overview of the James Webb Space Telescope (JWST) Advanced Deep Extragalactic Survey (JADES), ambitious program infrared imaging and spectroscopy in GOODS-S GOODS-N deep fields, designed to study galaxy evolution from high redshift cosmic noon. JADES uses about 770 hours Cycle 1 guaranteed time largely Near-Infrared Camera (NIRCam) Spectrograph (NIRSpec) instrument teams. In GOODS-S, around Hubble Ultra Field Chandra South, produces a region ~45 arcmin$^2$ with average 130 hrs...
We describe the NIRSpec component of JWST Deep Extragalactic Survey (JADES), and provide deep spectroscopy 253 sources targeted with micro-shutter assembly in Hubble Ultra Field surrounding GOODS-South. The multi-object spectra presented here are deepest so far obtained JWST, amounting to up 28 hours low-dispersion ($R 30-300$) prism, 7 each three medium-resolution $R 1000$ gratings one high-dispersion grating, G395H Our medium-dispersion cover wavelength range $0.6-5.3\ selection...
We describe the NIRSpec component of JWST Deep Extragalactic Survey (JADES), and provide deep spectroscopy 253 sources targeted with micro-shutter assembly in Hubble Ultra Field surrounding GOODS-South. The multi-object spectra presented here are deepest so far obtained JWST, amounting to up 28 hours low-dispersion ($R\sim 30-300$) prism, 7 each three medium-resolution $R\approx 1000$ gratings one high-dispersion grating, G395H ($R\approx2700$). Our medium-dispersion cover wavelength range...
ABSTRACT Extreme emission line galaxies (EELGs) exhibit large equivalent widths (EW) in their rest-optical lines ([O iii]$\lambda 5007$ or H $\alpha$ rest-frame EW$\gt 750$ Å) which can be tied to a recent upturn star formation rate (SFR), due the sensitivity of nebular and continuum young ($\lt 10$ Myr) evolved stellar populations, respectively. By studying sample 85 star-forming (SFGs), spanning redshift magnitude interval $3 \lt z\lt 9.5$ $-16\gt $M$\rm _{UV}\gt -21$, JWST Advanced Deep...
Extreme emission line galaxies (EELGs) exhibit large equivalent widths (EW) in their rest-optical lines ([OIII]$\lambda5007$ or H$\alpha$ rest-frame EW$ > 750\r{A}$) which can be tied to a recent upturn star formation rate, due the sensitivity of nebular and continuum young ($<10$Myr) evolved stellar populations, respectively. By studying sample 85 forming (SFGs), spanning redshift magnitude interval $3 <z<9.5$ $-16>$ M$_{UV}>-21$, JWST Advanced Deep Extragalactic Survey (JADES) with...
Finding and characterising the first galaxies that illuminated early Universe at cosmic dawn is pivotal to understand physical conditions processes led formation of stars. In few months operations, imaging from James Webb Space Telescope (JWST) have been used identify tens candidates redshift (z) greater than 10, less 450 million years after Big Bang. However, none these has yet confirmed spectroscopically, leaving open possibility they are actually low-redshift interlopers. Here we present...
Surveys with James Webb Space Telescope (JWST) have discovered candidate galaxies in the first 400 Myr of cosmic time. Preliminary indications suggested these may be more massive and abundant than previously thought. However, without confirmed distances, their inferred properties remain uncertain. Here we identify four located JWST Advanced Deep Extragalactic Survey (JADES) Near-Infrared Camera (NIRCam) imaging photometric redshifts z~10-13. These include redshift z>12 systems distances...
We analyse the chemical properties of three z~8 galaxies behind galaxy cluster SMACS J0723.3-7327, observed as part Early Release Observations programme James Webb Space Telescope (JWST). Exploiting [O III]4363 auroral line detections in NIRSpec spectra, we robustly apply direct Te method for very first time at such high redshift, measuring metallicities ranging from extremely metal poor (12+log(O/H)~7) to about one-third solar. also discuss excitation these sources, and compare them with...
The presence of Active Galactic Nuclei (AGN) in low mass (Mstar $\lesssim$ $10^{9}$ Msun) galaxies at high redshift has been established, and it is important to characterise these objects the impact their feedback on host galaxies. In this paper we apply Spectral Energy Distribution (SED) fitting code BEAGLE-AGN SMACS S06355, a z $\sim$ 7.66 Type-II AGN candidate from JWST NIRSpec Early Release Observations. This object's spectrum includes detection [NeIV]2426 line, indicating an obscured...