A5100685805- 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
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Quantum Mechanics and Non-Hermitian Physics
- Cosmology and Gravitation Theories
- Quantum chaos and dynamical systems
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Quantum Mechanics and Applications
- Thin-Film Transistor Technologies
- Pulsars and Gravitational Waves Research
- Meteorological Phenomena and Simulations
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Particle Accelerators and Free-Electron Lasers
- Silicon and Solar Cell Technologies
- Precipitation Measurement and Analysis
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
University of Milano-Bicocca
2023-2025
Johns Hopkins University
2017-2023
Center for Astrophysics Harvard & Smithsonian
2023
National University of Defense Technology
2022
Institute of Astronomy and Astrophysics, Academia Sinica
2016-2019
National Taiwan University
2016-2019
Heraeus (United States)
2018
Tsinghua University
2016-2017
Abstract The study of galaxy evolution hinges on our ability to interpret multiwavelength observations in terms their physical properties. To do this, we rely spectral energy distribution (SED) models, which allow us infer parameters from spectrophotometric data. In recent years, thanks wide and deep multiwave band surveys, the volume high-quality data have significantly increased. Alongside increased data, algorithms performing SED fitting improved, including better modeling prescriptions,...
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...
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...
Studying giant star-forming clumps in distant galaxies is important to understand galaxy formation and evolution. At present, however, observers theorists have not reached a consensus on whether the observed "clumps" are same phenomenon that seen simulations. In this paper, as step establish benchmark of direct comparisons between observations theories, we publish sample constructed represent commonly literature. This contains 3193 detected from 1270 at $0.5 \leq z < 3.0$. The rest-frame UV...
The majority of massive star-forming galaxies at $z\sim2$ have velocity gradients suggestive rotation, in addition to large amounts disordered motions. In this paper, we demonstrate that it is challenging distinguish the regular rotation a disk galaxy from orbital motions merging with seeing-limited data. However, merger fractions are likely too low for effect on measurements fractions. To determine how often mergers pass disks, look formation simulations. We analyze $\sim$24000 synthetic...
This paper uses radial colour profiles to infer the distributions of dust, gas and star formation in z=0.4-1.4 star-forming main sequence galaxies. We start with standard UVJ-based method estimate dust extinction specific rate (sSFR). By replacing J I band, a new calibration suitable for use ACS+WFC3 data is created (i.e. UVI diagram). Using multi-wavelength multi-aperture photometry catalogue based on CANDELS, 1328 galaxies are stacked stellar mass redshift bins. The resulting gradients,...
We present the Cosmic Evolution Early Release Science (CEERS) Survey, a 77.2 hour Director's Discretionary Program. CEERS demonstrates, tests, and validates efficient extragalactic surveys using coordinated, overlapping parallel observations with JWST instrument suite, including NIRCam MIRI imaging, NIRSpec low (R~100) medium (R~1000) resolution spectroscopy, slitless grism (R~1500) spectroscopy. targets Hubble Space Telescope-observed region of Extended Groth Strip (EGS) field, supported by...
Abstract Many studies conclude that galaxies quench from the inside-out by examining profiles of specific star formation rate (sSFR). These are usually measured fitting spectral energy distributions (SEDs) assuming a fixed dust law and uniform priors on all parameters. Here, we examine effects more physically motivated priors: flexible law, an exponential prior attenuation A V , Gaussian favor extended histories. This results in model colors better trace observations. We then perform radial...
Abstract Precise tracking of the growth in galaxy size and evolution merger fractions with redshift is vital for understanding formation history submillimeter galaxies (SMGs). This study investigates this over a broad range (1 < z ≲ 6) using sample 222 SMGs median <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>z</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2.6</mml:mn> <mml:msubsup> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> <mml:mo>−</mml:mo>...
<title>Abstract</title> Giant bulgeless disk galaxies, theoretically expected to be rare in the early Universe, have been confirmed by James Webb Space Telescope (JWST) exist as 2 billion years after Big Bang. These morphologically extreme systems offer valuable insights into physics of formation and interplay between galaxies their dark-matter halos. Using cosmological simulations, we identify analogs such with stellar masses around 10<sup>11</sup> M<sub>sun</sub> half-light radii up 6 kpc...
The rest-frame UV-optical (i.e., $NUV-B$) color is sensitive to both low-level recent star formation (specific rate - sSFR) and dust. In this Letter, we extend our previous work on the origins of $NUV-B$ gradients in star-forming galaxies (SFGs) at $z\sim1$ those $z\sim2$. We use a sample 1335 large (semi-major axis radius $R_{\rm SMA}>0.''18$) SFGs with extended UV emission out $2R_{\rm SMA}$ mass range $M_{\ast} = 10^{9}-10^{11}M_{\odot}$ $1.5<z<2.8$ CANDELS/GOODS-S UDS fields. show that...
Abstract At intermediate and high redshifts, measurements of galaxy star formation rates are usually based on rest-frame ultraviolet (UV) data. A correction for dust attenuation, UV , is needed these measurements. This typically inferred from spectral slopes ( β ) using an equation known as “Meurer’s Relation.” In this paper, we study relation at a redshift 1.5 images photometric in the HST through mid-infrared Spitzer ). It shown that massive star-forming galaxies (above <?CDATA ${10}^{10}\...
ABSTRACT The rest-frame UV–optical (i.e., NUV − B ) color index is sensitive to the low-level recent star formation and dust extinction, but it insensitive metallicity. In this Letter, we have measured gradients in ∼1400 large ( r e > 0.″18), nearly face-on b / a 0.5) main sequence star-forming galaxies (SFGs) between redshift 0.5 1.5 CANDELS/GOODS-S UDS fields. With sample, study origin of SFGs at z ∼ 1 discuss their link with buildup stellar mass. We find that more massive, centrally...
ABSTRACT Ly α nebulae ubiquitously found around z &gt; 2 quasars can supply unique constraints on the properties of circumgalactic medium, such as its density distribution, provided quasar halo mass is known. We present a new method to constrain masses based line-of-sight velocity dispersion maps nebulae. By using MUSE-like mock observations obtained from cosmological hydrodynamic simulations under assumption maximal fluorescence, we show that radial profiles emitting gas are strongly...
We investigate the galaxy quenching process at intermediate redshift using a sample of $\sim4400$ galaxies with $M_{\ast} > 10^{9}M_{\odot}$ between 0.5 and 1.0 in all five CANDELS fields. divide this sample, integrated specific star formation rate (sSFR), into four sub-groups: star-forming (SFGs) above below ridge main sequence (SFMS), transition quiescent galaxies. study their $UVI$ ($U-V$ versus $V-I$) color gradients to infer sSFR out twice effective radii. show that on average both...
Recent ALMA observations of high-redshift normal galaxies have been providing a great opportunity to clarify the general origin dust in Universe, not biased very bright special objects even at $z>6$. To what constraint we can get for enrichment detected by ALMA, use theoretical model that includes major processes driving evolution galaxy; is, condensation stellar ejecta, growth accretion gas-phase metals, and supernova destruction. Using emission fluxes two $z>6$ as constraint, range...
Strong galactic winds are ubiquitous at $z\gtrsim 1$. However, it is not well known where inside galaxies these launched from. We study the cool ($\sim 10^4$\,K) in two spatial regions of a massive galaxy $z=1.3$, which we nickname "Baltimore Oriole's Nest." The has stellar mass $10^{10.3\pm 0.3} M_\odot$, located on star-forming main sequence, and morphology indicative recent merger. Gas kinematics indicate dynamically complex system with velocity gradients ranging from 0 to 60...
We investigate how the stellar rotational support changes as a function of spatially resolved population age ($\rm D_n4000$) and relative central surface density ($\Delta \Sigma_1$) for MaNGA isolated/central disk galaxies. find that galaxy $\lambda_{R_\mathrm{e}}$ varies smoothly $\Delta \Sigma_1$ $\rm D_n4000$. D_n4000$ vs. follows "J-shape", with contributing to scatters. In this "J-shaped" pattern increases when is low but decreases high. Restricting attention low-$\Delta (i.e,...
Abstract Circumgalactic Ly α nebulae are gaseous halos around galaxies exhibiting luminous extended emission. This work investigates from deep imaging of ∼12 deg 2 sky, targeted by the MAMMOTH-Subaru survey. Utilizing wide-field capability Hyper Suprime-Cam, we present one largest blind nebula selections, including QSO nebulae, blobs, and radio galaxy down to typical σ surface brightness <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo...
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...
We present a catalog of spectroscopically measured redshifts over $0 < z 2$ and emission line fluxes for 1440 galaxies. The majority ($\sim$65\%) the galaxies come from HALO7D survey, with remainder DEEPwinds program. This includes 646 dwarf $\log(M_{\star}/M_{\odot}) 9.5$. 810 did not have previously published spectroscopic redshifts, including 454 used DEIMOS spectrograph on Keck II telescope to take very deep (up 32 hours exposure, median $\sim$7 hours) optical spectroscopy in COSMOS,...
We have measured the radial profiles of isophotal ellipticity ($\varepsilon$) and disky/boxy parameter A$_4$ out to radii about three times semi-major axes for $\sim4,600$ star-forming galaxies (SFGs) at intermediate redshifts $0.5<z<1.8$ in CANDELS/GOODS-S UDS fields. Based on average size versus stellar-mass relation each redshift bin, we divide our into Small SFGs (SSFGs), i.e., smaller than its mass, Large (LSFGs), larger average. find that, low masses ($M_{\ast} < 10^{10}M_{\odot}$),...
We report the identification of a quasar overdensity in BOSSJ0210 field, dubbed Cosmic Himalayas, consisting 11 quasars at $z=2.16-2.20$, densest ($17\sigma$) $\sim$10,000 deg$^2$ Sloan Digital Sky Survey. present spatial distributions galaxies and an HI absorption map intergalactic medium (IGM). On 465 selected from MAMMOTH-Subaru survey, we find two galaxy density peaks that do not fall on but instead exist northwest southeast sides, approximately 25 $h^{-1}$ comoving-Mpc apart...
Circumgalactic Lyman-alpha (Ly$\alpha$) nebulae are gaseous halos around galaxies exhibiting luminous extended Ly$\alpha$ emission. This work investigates from deep imaging of $\sim12~\mathrm{deg}^2$ sky, targeted by the MAMMOTH-Subaru survey. Utilizing wide-field capability Hyper Suprime-Cam (HSC), we present one largest blind nebula selections, including QSO nebulae, blobs, and radio galaxy down to typical $2\sigma$ surface brightness...