A5069723872- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Cosmology and Gravitation Theories
- Reproductive biology and impacts on aquatic species
- Aquaculture Nutrition and Growth
- Medical Imaging Techniques and Applications
- CCD and CMOS Imaging Sensors
- Plant Water Relations and Carbon Dynamics
- African studies and sociopolitical issues
- Cardiac Imaging and Diagnostics
- Spectroscopy and Laser Applications
- International Development and Aid
- Adaptive optics and wavefront sensing
- Spectroscopy and Chemometric Analyses
- African history and culture studies
- Molecular Biology Techniques and Applications
- Solar and Space Plasma Dynamics
University of Manchester
1969-2025
We present a reduction and analysis of the \textit{James Webb Space Telescope} (JWST) SMACS~0723 field using new post-launch calibrations to conduct search for ultra-high-redshift galaxies ($z > 9$) within Epoch Reionisation. this by modelling photometric redshifts in several ways all sources applying conservative magnitude cuts ($m_{\rm F200W} < 28$) identify strong Lyman breaks greater than 1 magnitude. find four $z 9$ candidate which have not previously been identified, with one object at...
We give an overview and describe the rationale, methods, first results from NIRCam images of JWST "Prime Extragalactic Areas for Reionization Lensing Science" ("PEARLS") project. PEARLS uses up to eight filters survey several prime extragalactic areas: two fields at North Ecliptic Pole (NEP); seven gravitationally lensing clusters; high redshift proto-clusters; iconic backlit VV 191 galaxy system map its dust attenuation. also includes NIRISS spectra one NEP NIRSpec high-redshift quasars....
We present early results regarding the morphological and structural properties of galaxies seen with James Webb Space Telescope at $z > 3$ in Early Release Observations SMACS 0723, a galaxy cluster $z=0.39$. investigate, for first time, optical morphologies significant number accurate photometric redshifts this field to determine form structure relatively universe. use visual \textsc{Morfometryka} measures perform quantitative morphology measurements, both parametric light profile fitting...
Abstract We present results on the morphological and structural evolution of a total 3956 galaxies observed with JWST at 1.5 < z 6.5 in CEERS observations that overlap CANDELS EGS field. This is biggest visually classified sample yet, ∼20 times larger than previous studies, allows us to examine detail how galaxy structure has changed over this critical epoch. All sources were by six individual classifiers using simple classification scheme aimed producing disk/spheroid/peculiar...
Abstract We present an analysis of the ultraviolet luminosity function (UV LF) and star formation rate density distant galaxies (7.5 < z 13.5) in “blank” fields Prime Extragalactic Areas for Reionization Lensing Science (PEARLS) survey combined with Early Release data from CEERS, GLASS, NGDEEP surveys/fields first release JADES. use strict quality cuts on EAZY photometric redshifts to obtain a reliable selection characterization high-redshift ( > 6.5) consistently processed set deep,...
Abstract We present an analysis of the quenching star formation in massive galaxies ( M * > 10 9.5 ⊙ ) within first 0.5–3 Gyr Universe’s history utilizing JWST-CEERS data. utilize a combination advanced statistical methods to accurately constrain intrinsic dependence multidimensional and intercorrelated parameter space. Specifically, we apply random forest classification, area statistics, partial correlation First, identify key testable predictions from two state-of-the-art cosmological...
Abstract We develop a photometric search method for identifying smouldering galaxies at 5 &lt; z 8, which are defined to have weak emission lines and thus generally low specific star formation rates may even be in state of (temporary) quiescence. The deep NIRCam imaging (∼29.5 AB mag, 5σ) from the JADES second data release is essential finding these systems, as they faint, relatively quiescent dwarf (M* ∼ 108–9 M⊙) Epoch Reionisation (EoR). Moreover, medium band key, enabling clear...
We present an early analysis on the search for high redshift galaxies using deepest public JWST imaging to date, NGDEEP field. This data consists of 6-band NIRCam Hubble Ultra Deep Field-Par2, covering a total area 6.3 arcmin$^{2}$. Based our initial reduction first half this survey, we reach 5$\sigma$ depths up mag = 29.5--29.9 between $1-5$ um. Such unprecedented opportunity begin exploring Universe with JWST. As such, find in field by examining spectral energy distribution these systems...
ABSTRACT We present the results of a size and structural analysis 1395 galaxies at 0.5 ≤ z ≲ 8 with stellar masses log (M*/M⊙)&gt; 9.5 within James Webb Space Telescope Public CEERS field that overlaps Hubble Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey EGS observations. use GALFIT to fit single Sérsic models rest-frame optical profile our galaxies, which is mass-selected sample complete redshift mass limit. Our primary result fixed wavelength mass, get progressively...
We present an analysis of a sample robust high redshift galaxies selected photometrically from the `blank' fields Prime Extragalactic Areas for Reionization Science (PEARLS) survey and Early Release Observations (ERO) data James Webb Space Telescope (JWST) with aim selecting candidate active galactic nuclei (AGN). Sources were identified parent using threefold selection procedure, which includes spectral energy distribution (SED) fitting to identify sources that are best fitted by AGN SED...
We analyse the photometric and spectroscopic properties of four galaxies in epoch reionisation (EoR) within SMACS 0723 JWST Early Release Observations field. Given known redshifts these sources, we investigated accuracy with which can be derived using NIRCam photometry alone, finding that F115W imaging is essential to distinguish between z~8 high equivalent width (EW) [O III] {\lambda}5007 emission z~10 Balmer break galaxies. find all sources exhibit strong (\geq 0.6 mag) F356W-F444W...
Abstract We utilize deep JWST Near Infrared Camera (NIRCam) observations for the first direct constraints on Galaxy Stellar Mass Function (GSMF) at z > 10. Our EPOCHS v1 sample includes 1120 galaxy candidates 6.5 < 13.5 taken from a consistent reduction and analysis of publicly available NIRCam data covering Prime Extragalactic Areas Reionization Science, CEERS, GLASS, JADES GOOD-S, NGDEEP, SMACS0723 surveys, totaling 187 arcmin 2 . investigate impact spectral energy distribution...
ABSTRACT We utilize theoretical models of Population III stellar + nebular spectra to investigate the prospects observing and accurately identifying galaxies with JWST using both deep imaging spectroscopy. a series different colour cuts, finding that combination NIRCam MIRI photometry through F444W−F560W, F560W−F770W colours offers most robust identifier potential z = 8 Pop candidates. calculate will have reach ∼28.5–30.0 AB mag depths (1–20 h), F560W must ∼27.5–29.0 (10–100 h) achieve 5σ...
Abstract Galaxy morphologies provide valuable insights into their formation processes, tracing the spatial distribution of ongoing star and encoding signatures dynamical interactions. While such information has been extensively investigated at low redshift, it is crucial to develop a robust system for characterizing galaxy earlier cosmic epochs. Relying solely on nomenclature established low-redshift galaxies risks introducing biases that hinder our understanding this new regime. In paper,...
ABSTRACT We present the analysis of stellar population and star formation history 181 MIRI selected galaxies at z = 0 − 3.5 in massive galaxy cluster field SMACS J0723.3–7327, commonly referred to as SMACS0723, using JWST Mid-Infrared Instrument (MIRI). combine data with Near Infrared Camera (NIRCam) catalogue, conjunction Hubble Space Telescope (HST) WFC3/IR ACS imaging. find that bands capture PAH features dust emission, significantly enhancing accuracy photometric redshift measurements...
We explore spectroscopic and photometric methods for identifying high-redshift galaxies containing an Active Galactic Nucleus (AGN) with JWST observations. After demonstrating the limitations of standard optical methods, which appear ineffective in low-metallicity environment early universe, we evaluate alternative diagnostic techniques using current observational capabilities. Our analysis focuses on line ratios equivalent widths (EWs) UV emission lines: CIV, HeII $\lambda$1640, OIII]...
New, ultra-deep medium-width photometric coverage with JWST's NIRCam instrument provides the potential for much improved photo-z reliability at high redshifts. In this study, we conduct a systematic analysis of JADES Origins Field, which contains 14 broad- and near-infrared bands, to assess benefits medium band photometry on high-z sample completeness contamination rates. Using imaging depths AB mag $29.8-30.35$, an experiment observe how selections differ when images are artificially...
Abstract We present a structural analysis of 520 galaxy candidates at 6.5 < z 12.5 with signal-to-noise ratio >10 σ in the F444W filter taken from EPOCHS v1 sample, consisting uniformly reduced deep JWST NIRCam data covering CEERS, JADES GOODS-S, NGDEEP, SMACS-0723, GLASS, and PEARLS surveys. use standard software to fit single Sérsic models each rest-frame optical extract their parametric parameters (Sérsic index, half-light radius, axis ratio) Morfometryka measure nonparametric...
Abstract We present a full analysis of galaxy major merger pair fractions, rates, and mass accretion thus uncovering the role mergers in formation at earliest previously unexplored epoch 4.5 &lt; z 11.5. target galaxies with masses log10(M*/M⊙) = 8.0 − 10.0, utilizing data from eight JWST Cycle-1 fields (CEERS, JADES GOODS-S, NEP-TDF, NGDEEP, GLASS, El-Gordo, SMACS-0723, MACS-0416), covering an unmasked area 189.36 arcmin2. develop new probabilistic pair-counting methodology that...
ABSTRACT In this paper, we discuss measurements of the stellar population and star-forming properties for 43 spectroscopically confirmed publicly available high-redshift z &gt; 7 JWST galaxies in JADES CEERS observational programs. We carry out a thorough study investigating relationship between spectroscopic features photometrically derived ones, including from spectral energy distribution (SED) fitting models, as well morphological structural properties. find that star formation rates...
Abstract We present in this paper the discovery, properties, and a catalog of 1165 high-redshift 6.5 < z 18 galaxies found deep JWST NIRCam imaging from GTO PEARLS survey combined with data public fields. describe our bespoke homogeneous reduction process analysis these areas including NEP, CEERS, GLASS, NGDEEP, JADES, ERO SMACS-0723 fields over 214 arcmin 2 imaged to depths ∼30 mag. rigorous methods for identifying galaxies, involving use Lyman-break strength, detection significance...
Abstract In this paper we describe our search for galaxy protocluster candidates at 4.5 &lt; z 10 and explore the environmental physical properties of their member galaxies identified through JWST wide-field surveys within CEERS, JADES, PEARLS NEP-TDF fields. Combining with HST data, identify 2948 robust &gt; an area 185.4 arcmin2. We determine nearest neighbour statistics environments. find that high-z in overdense environments exhibit higher star formation activity compared to...
ABSTRACT The presence of evolved stars in high-redshift galaxies can place valuable indirect constraints on the onset star formation Universe. Thus, we use PEARLS GTO (Prime Extragalactic Areas for Reionization and Lensing Science Guaranteed Time Observations) public NIRCam (Near Infrared Camera) photometric data to search Balmer-break candidate at 7 &lt; z 12. We find that our candidates ∼ 10.5 tend be older (115 Myr), have lower inferred [O iii] + Hβ equivalent widths (120 Å), specific...
We utilize deep JWST NIRCam observations for the first direct constraints on Galaxy Stellar Mass Function (GSMF) at z>10. Our EPOCHS v1 sample includes 1120 galaxy candidates 6.5<z<13.5 taken from a consistent reduction and analysis of publicly available data covering PEARLS, CEERS, GLASS, JADES GOOD-S, NGDEEP, SMACS0723 surveys, totalling 187 arcmin2. investigate impact SED fitting methods, assumed star formation histories (SFH), dust laws, priors masses resultant GSMF. Whilst our fiducial...
We present a full analysis of galaxy major merger pair fractions, rates, and mass accretion thus uncovering the role mergers in formation at earliest previously unexplored epoch $4.5<z<11.5$. target galaxies with masses $\log_{10}(\mathrm{M}_*/\mathrm{M}_\odot) = 8.0 - 10.0$, utilizing data from eight JWST Cycle-1 fields (CEERS, JADES GOODS-S, NEP-TDF, NGDEEP, GLASS, El-Gordo, SMACS-0723, MACS-0416), covering an unmasked area 189.36 $\mathrm{arcmin}^2$. develop new probabilistic...