Luca Costantin
A5031631103- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Plant Water Relations and Carbon Dynamics
- Remote Sensing in Agriculture
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Radio Astronomy Observations and Technology
- Advanced Vision and Imaging
- Pulsars and Gravitational Waves Research
- Superconducting and THz Device Technology
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Spectroscopy Techniques in Biomedical and Chemical Research
- Computational Physics and Python Applications
- Heat Transfer Mechanisms
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
Centro de Astrobiología
2019-2024
Dublin Institute For Advanced Studies
2023-2024
Brera Astronomical Observatory
2018-2023
Durham University
2023
ARC Centre of Excellence for All-sky Astrophysics
2023
Instituto Nacional de Técnica Aeroespacial
2021
University of Padua
2014-2019
Osservatorio Astronomico di Padova
2016-2019
We report the discovery of a candidate galaxy with photo-z z~12 in first epoch JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative selection criteria we identify source robust z_phot = 11.8^+0.3_-0.2 (1-sigma uncertainty) m_F200W=27.3, and >7-sigma detections five filters. The is not detected at lambda < 1.4um deep imaging from both HST JWST, has faint ~3-sigma F150W F160W, which signal Ly-alpha break near red edge filters, implying z~12. This object (Maisie's...
Abstract We present the data release and reduction process for Epoch 1 NIRCam observations Cosmic Evolution Early Release Science Survey (CEERS). These consist of imaging in six broadband filters (F115W, F150W, F200W, F277W, F356W F444W) one medium-band filter (F410M) over four pointings, obtained parallel with primary CEERS MIRI observations. reduced JWST Calibration Pipeline, custom modifications steps designed to address additional features challenges data. Here we provide a detailed...
Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources expected drop out bluer filters while well detected redder filters. However, here we show that dust-enshrouded star-forming galaxies lower redshifts (z<7) may also mimic near-infrared (near-IR) colors LBGs, representing potential contaminants LBG candidate samples. First, analyze...
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for William Herschel Telescope, will see first light in late 2022. WEAVE comprises a 2-degree field-of-view prime-focus corrector system, nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and single large IFU. These systems feed dual-beam spectrograph covering wavelength range 366$-$959\,nm at $R\sim5000$, or two shorter ranges $R\sim20\,000$. After summarising...
We present rest-frame optical emission-line flux ratio measurements for five $z>5$ galaxies observed by the JWST Near-Infared Spectrograph (NIRSpec) in SMACS 0723 Early Release Observations. add several quality-control and post-processing steps to NIRSpec pipeline reduction products order ensure reliable relative calibration of emission lines that are closely separated wavelength, despite uncertain \textit{absolute} spectrophotometry current version reductions. Compared $z\sim3$ literature,...
The new capabilities that JWST offers in the near- and mid-infrared (IR) are used to investigate unprecedented detail nature of optical/near-IR faint, mid-IR bright sources, HST-dark galaxies among them. We gather data from CEERS survey EGS, jointly with HST data, analyze spatially resolved optical-to-mid-IR spectral energy distributions (SEDs) estimate both photometric redshifts 2 dimensions stellar populations properties a pixel-by-pixel basis. select 138 F150W-F356W>1.5 mag, F356W<27.5...
Abstract We present a comprehensive analysis of the evolution morphological and structural properties large sample galaxies at z = 3–9 using early James Webb Space Telescope (JWST) CEERS NIRCam observations. Our consists 850 > 3 detected in both Hubble (HST)/WFC3 JWST/NIRCam images, enabling comparison HST JWST morphologies. conduct set visual classifications, with each galaxy classified three times. also measure quantitative morphologies across all filters. find that have wide diversity...
Abstract We present the ultraviolet luminosity function and an estimate of cosmic star formation rate density at 8 < z 13 derived from deep NIRCam observations taken in parallel with MIRI Deep Survey Hubble Ultra Field (HUDF), covering field 2. Our (40 hr) reach F277W magnitude 30.8 (5 σ ), more than 2 mag deeper JWST public data sets already analyzed to find high-redshift galaxies. select a sample 44 > galaxy candidates based on their dropout nature F115W and/or F150W filters, high...
Stellar bars are key drivers of secular evolution in galaxies and can be effectively studied using rest-frame near-infrared (NIR) images, which trace the underlying stellar mass less impacted by dust star formation than UV or optical images. We leverage power {\it{JWST}} CEERS NIRCam images to present first quantitative identification characterization at $z>1$ based on NIR F444W high resolution (~1.3 kpc z ~ 1-3). identify these criteria ellipse fits. For this pilot study, we six examples...
Abstract We study a new population of extremely red objects (EROs) recently discovered by the James Webb Space Telescope (JWST) based on their NIRCam colors F277W − F444W > 1.5 mag. find 37 EROs in Cosmic Evolution Early Release Science Survey (CEERS) field with < 28 mag and photometric redshifts between 5 z 7, median <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>z</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>6.9</mml:mn>...
Abstract We present results from the Cosmic Evolution Early Release Survey on stellar population parameters for 28 galaxies with redshifts 4 < z 9 using imaging data James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) combined Hubble and Spitzer Telescope. The JWST/MIRI 5.6 7.7 μ m extend coverage of rest-frame spectral energy distribution to nearly 1 in this redshift range. By modeling galaxies’ SEDs MIRI show that have, average, UV (1600 Å)— I -band colors 0.4 mag bluer...
Abstract We combine deep imaging data from the CEERS early release JWST survey and Hubble Space Telescope CANDELS to examine size–mass relation of star-forming galaxies morphology–quenching at stellar masses M ⋆ ≥ 10 9.5 ⊙ over redshift range 0.5 < z 5.5. In this study with a sample 2450 galaxies, we separate quiescent based on their star formation activity confirm that have different morphologies out = 5.5, extending results earlier studies higher redshifts. find typical Sérsic indices n...
The Epoch of Reionization (EoR) began when galaxies grew in abundance and luminosity, so their escaping Lyman continuum (LyC) radiation started ionizing the surrounding neutral intergalactic medium (IGM). Despite significant recent progress, nature role cosmic reionizers are still unclear: order to define them, it would be necessary directly measure LyC escape fraction ( f esc ). However, this is impossible during EoR due opacity IGM. Consequently, many efforts at low intermediate redshift...
Abstract Visual inspections of the first optical rest-frame images from JWST have indicated a surprisingly high fraction disk galaxies at redshifts. Here, we alternatively apply self-supervised machine learning to explore morphological diversity z ≥ 3. Our proposed data-driven representation scheme galaxy morphologies, calibrated on mock TNG50 simulation, is shown be robust noise and correlate well with physical properties simulated galaxies, including their 3D structure. We method...
Abstract We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin 2 of publicly available Cycle 1 data from COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W−F444W (∼2.5 mag) detection MIRI/F770W (∼25 mag), we identify two galaxies, COS-z8M1 CEERS-z7M1, that have best-fit photometric redshifts <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>z</mml:mi>...
Abstract We make use of JWST medium-band and broadband NIRCam imaging, along with ultradeep MIRI 5.6 μ m in the Hubble eXtreme Deep Field to identify prominent line emitters at z ≃ 7–8. Out a total 58 galaxies 7–8, we find 18 robust candidates (≃31%) for (H β + [O iii ]) emitters, based on their enhanced fluxes F430M F444W filters, EW 0 +[O ≃87–2100 Å. Among these 16 lie coverage area 12 exhibit clear flux excess m, indicating simultaneous presence H α emission ) ≃200–3000 This is first time...
We present a catalog of about 25,000 images massive ($M_{\star} \ge 10^9 M_{\odot}$) galaxies at redshift $3 \leq z 6$ from the TNG50 cosmological simulation, tailored for observations multiple wavelengths carried out with JWST. The synthetic were created SKIRT radiative transfer code, including effects dust attenuation and scattering. noiseless processed mirage simulator to mimic Near Infrared Camera (NIRCam) observational strategy (e.g., noise, dithering pattern, etc.) Cosmic Evolution...
We report on the host properties of five X-ray luminous Active Galactic Nuclei (AGN) identified at $3 < z 5$ in first epoch imaging from Cosmic Evolution Early Release Science Survey (CEERS). Each galaxy has been imaged with \textit{James Webb Space Telescope} (\jwst) Near-Infrared Camera (NIRCam), which provides spatially resolved, rest-frame optical morphologies these redshifts. also derive stellar masses and star formation rates for each by fitting its spectral energy distribution using a...
The majority of massive disk galaxies in the local Universe show a stellar barred structure their central regions, including our Milky Way1,2. Bars are supposed to develop dynamically cold disks at low redshift, as strong gas turbulence typical high redshift suppresses or delays bar formation3,4. Moreover, simulations predict bars be almost absent beyond z = 1.5 progenitors Way-like galaxies5,6. Here we report observations ceers-2112, spiral galaxy zphot ≈ 3, which was already mature when...
Abstract The 3D geometries of high-redshift galaxies remain poorly understood. We build a differentiable Bayesian model and use Hamiltonian Monte Carlo to efficiently robustly infer the shapes star-forming in James Webb Space Telescope Cosmic Evolution Early Release Science observations with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mo>*</mml:mo> </mml:msub> <mml:mo...
We present MIRI/JWST medium-resolution spectroscopy (MRS) and imaging (MIRIM) of the lensed galaxy MACS1149-JD1 at a redshift z = 9.1092 ± 0.0002, when Universe was about 530 Myr old. detect, for first time, spatially resolved H α emission in above nine. The structure emitting gas consists two clumps, S N, carrying 60% 40% total flux, respectively. luminosity implies an instantaneous star-formation rate range 3.2 0.3 5.3 0.4 M ⊙ yr −1 sub-solar solar metallicities. ionizing photon production...
Context. We investigate the morphology and resolved physical properties of a sample 22 IR-selected dusty star-forming galaxies at cosmic noon using James Webb Space Telescope NIRCam images obtained in EGS field for CEERS survey. The exceptional resolution allowed us to spatially resolve these up 4.4 μm identify their bulge or core even when very extinguished by dust. Aims. goal this study is obtain better understanding formation evolution FIR-bright resolving JWST order look through dust...
Abstract We present deep James Webb Space Telescope (JWST)/Mid-Infrared Instrument (MIRI) F560W observations of a flux-limited, Atacama Large Millimeter/submillimeter Array (ALMA)-selected sample 28 galaxies at z = 0.5–3.7 in the Hubble Ultra Deep Field (HUDF). The data from MIRI Imaging Survey (MIDIS) reveal stellar structure HUDF rest-frame wavelengths λ > 1 μ m for first time. revise mass estimates using new JWST photometry and find good agreement with pre-JWST analyses; few...
Abstract We analyze the evolution of massive (log 10 [ M ⋆ / ⊙ ] > 10) galaxies at z ∼ 1–4 selected from JWST Cosmic Evolution Early Release Survey (CEERS). infer physical properties all in CEERS NIRCam imaging through spectral energy distribution (SED) fitting with dense basis to select a sample high-redshift galaxies. Where available we include constraints additional observing modes, including 18 sources MIRI photometric coverage, and 28 spectroscopic confirmations NIRSpec or WFSS....