A5000674322- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Phase Equilibria and Thermodynamics
- Magnetic confinement fusion research
- Magnetic properties of thin films
- Solar and Space Plasma Dynamics
- Laser Design and Applications
- Mass Spectrometry Techniques and Applications
- CCD and CMOS Imaging Sensors
- Geology and Paleoclimatology Research
- Particle accelerators and beam dynamics
- Historical and Archaeological Studies
- Radioactive contamination and transfer
- Theoretical and Computational Physics
- Photocathodes and Microchannel Plates
- Power Line Communications and Noise
- Calibration and Measurement Techniques
Space Telescope Science Institute
2021-2024
Osservatorio Astronomico di Padova
2019-2021
University of Bologna
2006-2020
Arcetri Astrophysical Observatory
2017-2020
Osservatorio astronomico di Bologna
2017
Istituto Nazionale per la Fisica della Materia
1997
University of Ferrara
1997
Abstract The first JWST spectroscopy of the luminous galaxy GN-z11 simultaneously established its redshift at z = 10.6 and revealed a rest-ultraviolet spectrum dominated by signatures highly ionized nitrogen, which has so far defied clear interpretation. We present reappraisal this in context both detailed nebular modeling nearby metal-poor reference galaxies. N iv ] emission enables density measurement an apparently predominantly star-forming > 10, revealing evidence for extremely high...
Abstract We present JWST/NIRSpec prism spectroscopy of MACS0647−JD, a triply lensed z ∼ 11 candidate discovered in Hubble Space Telescope imaging and spatially resolved by JWST into two components, A B. Spectroscopy component yields spectroscopic redshift = 10.17 based on seven detected emission lines: C iii ] λ 1907, 1909, [O ii 3727, [Ne 3869, 3968, H δ 4101, γ 4340, 4363. These are the second-most distant detections these lines to date, galaxy observed just 460 million years after Big...
Abstract We determine the spectroscopic properties of ≃1000 ostensibly star-forming galaxies at redshifts ( z = 4–10) using prism spectroscopy from JWST/NIRSpec. With rest-wavelength coverage between Ly α and [S ii ] in optical, we stack spectra as a function nebular conditions, compare UV spectral with stellar age. This reveals lines N iii ], iv C , He O average high- galaxy. All are more intense younger starbursts. measure electron temperatures collisionally excited [O line ratios, finding...
We investigated the interstellar medium properties of disc and outflowing gas in central regions nine nearby Seyfert galaxies, all characterised by prominent outflows. These objects are part Measuring Active Galactic Nuclei Under MUSE Microscope survey, which aims to probe their physical conditions ionisation mechanism exploiting unprecedented sensitivity. studied different outflow with spatially kinematically resolved maps dividing strongest emission lines velocity bins. associated core...
We measured gas-phase metallicity, ionisation parameter and dust extinction for 1795 representative local star-forming galaxies using integral field spectroscopy from the SDSS-IV MaNGA survey. self-consistently derive these quantities by comparing observed line fluxes with photoionisation models a Bayesian framework. also present first comprehensive study of [SIII]$\lambda\lambda$9069,9532 nebular lines, which have long been predicted to be ideal tracers parameter. Unfortunately, we find...
Far-ultraviolet (FUV; ~1200-2000 angstroms) spectra are fundamental to our understanding of star-forming galaxies, providing a unique window on massive stellar populations, chemical evolution, feedback processes, and reionization. The launch JWST will soon usher in new era, pushing the UV spectroscopic frontier higher redshifts than ever before, however, its success hinges comprehensive star populations gas conditions that power observed spectral features. This requires level detail is only...
Abstract We report the results of analyses galactic outflows in a sample 45 low-redshift starburst galaxies COS Legacy Archive Spectroscopic SurveY (CLASSY), augmented by five additional similar starbursts with Cosmic Origins Spectrograph (COS) data. The are traced blueshifted absorption lines metals spanning wide range ionization potential. high quality and broad spectral coverage CLASSY data enable us to disentangle due static interstellar medium (ISM) from that outflows. further use...
Quasar feedback in the form of powerful outflows is invoked as a key mechanism to quench star formation galaxies, although direct observational evidence still scarce and debated. Here we present Early Release Science JWST NIRSpec IFU observations z=1.59 prototypical obscured Active Galactic Nucleus (AGN) XID2028: This target represents unique test case for studying quasar at peak epoch AGN-galaxy co-evolution because extensive multi-wavelength coverage available massive extended outflow...
Abstract In the current JWST era, rest-frame UV spectra play a crucial role in enhancing our understanding of interstellar medium (ISM) and stellar properties first galaxies epoch reionization ( z > 6). Here, we compare well-known reliable optical diagrams sensitive to main ionization source (i.e., star formation, SF; active galactic nuclei, AGN; shocks) counterparts proposed literature—the so-called “UV–BPT diagrams”—using HST COS Legacy Archive Spectroscopic SurveY (CLASSY), which is...
Sources at the brightest end of QSO luminosity function during peak epoch star formation and black hole accretion (z~2-4, i.e. Cosmic noon) are privileged sites to study feeding & feedback cycle massive galaxies. We perform first systematic cold gas properties in most luminous QSOs, by characterising their host-galaxies environment. analyse ALMA, NOEMA JVLA observations FIR continuum, CO [CII] emission lines eight QSOs ($L_{\rm Bol}>3\times10^{47}$ erg/s) from WISSH sample z~2.4-4.7. report...
Abstract In the disks of four jellyfish galaxies from GASP sample at redshift ∼0.05 we detect molecular gas masses systematically higher than in field galaxies. These are being stripped their by ram pressure intracluster medium and are, general, forming stars a high rate with respect to nonstripped similar stellar masses. We find that, unless giant clouds disk unbound leading exceptionally CO–to–H 2 conversion factors, these have content 4–5 times normal masses, depletion ranging ∼1 9 Gyr,...
Abstract The Cosmic Origins Spectrograph (COS) Legacy Archive Spectroscopic SurveY (CLASSY) provides the first high-resolution spectral catalog of 45 local high- z analogs in ultraviolet (UV; 1200–2000 Å) to investigate their stellar and gas properties. Here we present a toolkit UV interstellar medium (ISM) diagnostics, analyzing main emission lines CLASSY spectra (N iv ] λ 1483,87, C λλ 1548,51, He ii 1640, O iii 1661,6, Si 1883,92, 1907,9). Specifically, our aim is provide accurate...
Baryonic feedback is expected to play a key role in regulating the star formation of low-mass galaxies by producing galaxy-scale winds associated with mass-loading factors β ∼ 1 − 50. We test this prediction using sample 19 nearby systems stellar masses 10 7 < M ⋆ / ⊙ , mostly lying above main sequence star-forming galaxies. used MUSE at VLT optical integral field spectroscopy study warm ionised gas kinematics these via detailed modelling their H α emission line. The characterised...
Abstract We present results from MUSE spatially resolved spectroscopy of 21 post-starburst galaxies in the centers eight clusters z ∼ 0.3 to 0.4. measure star formation histories (SFHs), time since quenching ( t Q ), and fraction stellar mass assembled past 1.5 Gyr μ ). The SFHs display a clear enhancement prior for 16 out objects, with at least 10% (and up >50%) being ranging less than 100 ∼800 Myr. By mapping , we analyze patterns galaxies. Most our sample have quenched their outside or...
We present JWST/NIRSpec prism spectroscopy of MACS0647-JD, the triply-lensed $z \sim 11$ candidate discovered in HST imaging and spatially resolved by JWST into two components A B. Spectroscopy component yields a spectroscopic redshift $z=10.17$ based on 7 detected emission lines: CIII] $\lambda\lambda$1907,1909, [OII] $\lambda$3727, [NeIII] $\lambda$3869, $\lambda$3968, H$\delta$ $\lambda$4101, H$\gamma$ $\lambda$4340, [OIII] $\lambda$4363. These are second-most distant detections these...
Abstract Ly α line profiles are a powerful probe of interstellar medium (ISM) structure, outflow speed, and Lyman-continuum escape fraction. In this paper, we present the Cosmic Origins Spectrograph (COS) Legacy Archive Spectroscopic SurveY, sample rich in spectroscopic analogs reionization-era galaxies. A large fraction spectra show complex profile, consisting double-peaked emission profile bottom damped, absorption trough. Such reveal an inhomogeneous ISM. We successfully fit damped...
Abstract We present JWST/NIRSpec high-resolution G395H/F290LP spectroscopy of MACS0647−JD, a gravitationally lensed galaxy merger at z = 10.167. The new spectroscopy, which is acquired for the two images (JD1 and JD2), detects resolves emission lines in rest-frame ultraviolet blue optical, including resolved [O ii ] λ 3726, 3729 doublet, [Ne iii 3870, He i 3890, H δ , γ 4363. This first observation doublet > 8. measure line flux ratio 3729/ 3726 0.9 ± 0.3, corresponds to an estimated...
Abstract Ram pressure stripping is a crucial evolutionary driver for cluster galaxies. It thought to be able accelerate the evolution of their star formation, trigger activity central active galactic nucleus (AGN) and interplay between environmental gas, eventually dissipate gas reservoirs. We explored outcomes ram by studying nonthermal radio emission jellyfish galaxy JW100 in A2626 ( z = 0.055), combining LOw Frequency Array, MeerKAT, Very Large Array observations from 0.144 5.5 GHz....
Abstract The COS Legacy Archive Spectroscopic SurveY (CLASSY) is designed to provide the community with a spectral atlas of 45 nearby star-forming galaxies that were chosen cover similar properties those seen at high z ( > 6). prime high-level science product CLASSY accurately coadded UV spectra, ranging from ∼1000 2000 Å, derived combination archival and new data obtained HST’s Cosmic Origins Spectrograph (COS). This paper details multistage technical processes creating this...
Abstract Galaxy formation and evolution are regulated by the feedback from galactic winds. Absorption lines provide most widely available probe of However, since data only information integrated along line sight, they do not directly constrain radial structure outflows. In this paper, we present a method to measure gas electron density in outflows ( n e ), which turn yields estimates outflow cloud properties (e.g., density, volume filling factor, sizes/masses). We also estimate distance r )...
Abstract JWST spectroscopy has revolutionized our understanding of galaxies in the early Universe. Covering wavelengths up to 5.3 μ m, NIRSpec can detect rest-frame optical H α emission lines out z = 7 and [O iii ] 9.5. Observing these more distant requires longer wavelength with MIRI. Here we present MIRI Medium Resolution Spectrograph integral field unit observations lensed galaxy merger MACS0647–JD at 10.165. With exposure times 4.2 hr each two bands (SHORT LONG), 9 σ , λ 5008 11 4960 3 ....
ABSTRACT The recent decade has seen an exponential growth in spatially resolved metallicity measurements the interstellar medium (ISM) of galaxies. To first order, these are characterized by slope radial profile, known as gradient. In this work, we model relative role star formation feedback, gas transport, cosmic accretion, and galactic winds driving profiles setting mass–metallicity gradient relation (MZGR). We include a comprehensive treatment processes including them sources that supply...
We study the physical and dynamical properties of ionized gas in prototypical HII galaxy Henize 2-10 using MUSE integral field spectroscopy. The large scale dynamics is dominated by extended outflowing bubbles, probably results massive ejection from central star forming regions. derive a mass outflow rate dMout/dt~0.30 Msun/yr, corresponding to loading factor eta~0.4, range with similar measurements local LIRGs. Such has total kinetic energy that sustainable stellar winds Supernova Remnants...
Ionized outflows, revealed by broad asymmetric wings of the [OIII] line, are commonly observed in AGN but low intrinsic spatial resolution observations has generally prevented a detailed characterization their properties. The MAGNUM survey aims at overcoming these limitations focusing on nearest AGN, including NGC 1365, nearby Seyfert galaxy (D~17 Mpc), hosting low-luminosity (Lbol ~ 2x10^43 erg/s). We want to obtain picture ionized gas central ~5 kpc 1365 terms physical properties,...
Abstract The study of cluster post-starburst galaxies gives useful insights on the physical processes quenching star formation in most massive environments. Exploiting Multi Unit Spectroscopic Explorer data GAs Stripping Phenomena project, we characterize history eight local that were selected for not showing emission lines their fiber spectra. We inspect integrated colors, H β rest-frame equivalent widths (EW), star-formation histories (SFHs), and luminosity-weighted age (LWA) maps finding...