A5066670607- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Advanced Optical Sensing Technologies
- Photoacoustic and Ultrasonic Imaging
- Seismic Imaging and Inversion Techniques
- Stellar, planetary, and galactic studies
- Statistical and numerical algorithms
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
The University of Melbourne
2022-2025
ARC Centre of Excellence for All-sky Astrophysics
2022-2025
ASTRO-3D
2022-2024
University of Milan
2023
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....
Abstract We present the number densities and physical properties of bright galaxies spectroscopically confirmed at z ∼ 7–14. Our sample is composed 60 spec 7–14, including recently = 12.34–14.18 with JWST, as well new confirmations 6.583–7.643 −24 < M UV −21 mag using ALMA Keck. JWST/NIRSpec observations have also revealed that very galaxy candidates 10–13 identified from ground-based telescope images before JWST are passive 3–4, emphasizing necessity strict screening spectroscopy in...
Abstract The redshift and size distributions of galaxy scale strong lenses depend on the evolution early-type galaxies (ETGs). We use this dependence to constrain velocity dispersion function (VDF) from Strong Lensing Legacy Survey (SL2S) sample in range 0.25 ≲ z 0.75. Our modeling lens population includes identifiability given survey parameters, constrains VDF based sources as well distribution Einstein radii. consider five different assumptions for reference at zero two sets scaling...
We derive the spatial and wavelength behavior of dust attenuation in multiple-armed spiral galaxy VV191b using backlighting by superimposed elliptical system VV191a a pair with an exceptionally favorable geometry for this measurement. Imaging JWST HST spans range 0.3-4.5 microns high angular resolution, tracing detail from 0.6 to 1.5 microns. Distinct lanes continue well beyond bright arms, trace complex web, very sharp radial cutoff near 1.7 Petrosian radii. present profiles coverage...
Photometric wide-area observations in the next decade will be capable of detecting a large number galaxy-scale strong gravitational lenses, increasing lens sample size by orders magnitude. To aid forecasting and analysis these surveys, we construct flexible model based on observed distributions for source properties test it results past searches, including SL2S, SuGOHI searches COSMOS HST DES fields. We use this to estimate expected yields some current planned Euclid Wide, Vera Rubin LSST,...
The bright end of the rest-frame UV luminosity function (UVLF) high-redshift galaxies is modified by gravitational lensing magnification bias. Motivated recent discoveries very high-z with JWST, we study dependence bias on finite size sources at $6<z<14$. We calculate probability distributions and use these to assuming a Schechter UVLF for redshift find that together lens ellipticity significantly suppresses bias, producing an observed which declines more sharply than power-law resulting...
Context. The galactic component in clusters is commonly thought to be generally nonrotating and a dynamical state different from that of collisionally relaxed system. In practice, test for such conditions often not available. Aims. We consider the member galaxies two Abell S1063 MACS J1206.2−0847 study possible presence mean rotation some properties their distribution phase space. look empirical evidence factors normally found systems other characteristics violently collisionless systems....
ABSTRACT Photometric wide-area observations in the next decade will be capable of detecting a large number galaxy-scale strong gravitational lenses, increasing lens sample size by orders magnitude. To aid forecasting and analysis these surveys, we construct flexible model based on observed distributions for source properties test it results past searches, including SL2S, SuGOHI, searches COSMOS HST DES fields. We use this to estimate expected yields some current planned Euclid Wide, Vera...
The redshift and size distributions of galaxy scale strong lenses depend on the evolution early-type galaxies (ETGs) in range 0.2<z<1. We use this dependence to constrain velocity dispersion function (VDF) from Strong Lensing Legacy Survey (SL2S) sample lenses. Our modeling lens population includes identifiability given survey parameters, constrains VDF based sources as well distribution Einstein radii. consider five different assumptions for reference at zero two sets scaling relations VDF....
The galactic component in clusters is commonly thought to be generally nonrotating and a dynamical state different from that of collisionally relaxed system. In practice, test such picture often not available. We consider the member galaxies two clusters, Abell S1063 MACS J1206.2$-$0847, study possible presence mean rotation some properties their distribution phase space. look for empirical evidence factors normally found systems others characteristic violently-relaxed collisionless systems....
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....
The bright end of the rest-frame UV luminosity function (UVLF) high-redshift galaxies is modified by gravitational lensing magnification bias. Motivated recent discoveries very high-z with JWST, we study dependence bias on finite size sources at $6
We derive the spatial and wavelength behavior of dust attenuation in multiple-armed spiral galaxy VV191b using backlighting by superimposed elliptical system VV191a a pair with an exceptionally favorable geometry for this measurement. Imaging JWST HST spans range 0.3-4.5 microns high angular resolution, tracing detail from 0.6 to 1.5 microns. Distinct lanes continue well beyond bright arms, trace complex web, very sharp radial cutoff near 1.7 Petrosian radii. present profiles coverage...