A5082637142- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Remote Sensing in Agriculture
- Solar and Space Plasma Dynamics
- CCD and CMOS Imaging Sensors
- Particle Accelerators and Free-Electron Lasers
- Photocathodes and Microchannel Plates
- Pulsars and Gravitational Waves Research
- Spectroscopy and Laser Applications
- High-pressure geophysics and materials
- Atmospheric Ozone and Climate
Trieste Astronomical Observatory
2016-2025
National Institute for Astrophysics
2009-2023
Arizona State University
2023
École Polytechnique Fédérale de Lausanne
2023
Scuola Internazionale Superiore di Studi Avanzati
2021
University of Trieste
2004-2016
Trinity House
2014
Institute for Space Astrophysics and Planetology
2011
University of Baltimore
2009
Johns Hopkins University
2009
The Sloan Digital Sky Survey (SDSS) will provide the data to support detailed investigations of distribution luminous and nonluminous matter in universe: a photometrically astrometrically calibrated digital imaging survey π sr above about Galactic latitude 30° five broad optical bands depth g' ∼ 23 mag, spectroscopic approximately 106 brightest galaxies 105 quasars found photometric object catalog produced by survey. This paper summarizes observational parameters products SDSS serves as an...
This special issue of the Astrophysical Journal Letters is dedicated to presenting initial results from Great Observatories Origins Deep Survey (GOODS) that are primarily, but not exclusively, based on multiband imaging data obtained with Hubble Space Telescope and Advanced Camera for Surveys (ACS). The survey covers roughly 320 arcmin2 in ACS F435W, F606W, F814W, F850LP bands, divided into two well-studied fields. Existing deep observations Chandra X-Ray Observatory ground-based facilities...
Aims.We study the relationship between local environment of galaxies and their star formation rate (SFR) in Great Observatories Origins Deep Survey, GOODS, at .
The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbit multi-cycle treasury program to use the gravitational lensing properties of 25 galaxy clusters accurately constrain their mass distributions. survey, described in detail this paper, will definitively establish degree concentration dark matter cluster cores, key prediction CDM. CLASH sample larger and less biased than current samples space-based imaging studies similar depth, as we have minimized lensing-based...
In this paper we present the source catalog obtained from a 942 ks exposure of Chandra Deep Field South (CDFS), using Advanced CCD Imaging Spectrometer (ACIS-I) on X-ray Observatory. Eleven individual pointings made between 1999 October and 2000 December were combined to generate final image used for object detection. Catalog generation proceeded simultaneously two different methods; method our own design modified version SExtractor algorithm, wavelet transform technique developed...
We present the results of our spectroscopic follow-up program X-ray sources detected in 942 ks exposure Chandra Deep Field-South (CDFS). A total 288 possible counterparts were observed at VLT with FORS1/FORS2 spectrographs for 251 349 (including three additional faint sources). Spectra and R-band images are shown all R - K colors given most them. Spectroscopic redshifts obtained 168 sources, which 137 have both reliable optical identification redshift estimate 16 external identifications)....
We present our first results from 120 ks of X-ray observations obtained with the Advanced CCD Imaging Spectrometer on Chandra X-Ray Observatory. The field two combined exposures is 0.096 deg2 and detection limit to a S/N 2 (corresponding ~7 net counts). reach flux × 10-16 erg s-1 cm-2 in 0.5-2 keV soft band 10-15 2-10 hard band. Our sample has 144 sources 91 sources, for total 159 sources. Fifteen are detected only band, 68 For optical identification, we carried out survey VRI FORS-1 imaging...
Euclid is a space-based survey mission from the European Space Agency designed to understand origin of Universe's accelerating expansion. It will use cosmological probes investigate nature dark energy, matter and gravity by tracking their observational signatures on geometry universe cosmic history structure formation. The optimised for two independent primary probes: Weak gravitational Lensing (WL) Baryonic Acoustic Oscillations (BAO). payload consists 1.2 m Korsch telescope provide large...
Aims.The goal of this work is to measure the evolution Galaxy Stellar Mass Function and resulting Density up redshift 4, in order study assembly massive galaxies high Universe.
We present a detailed X-ray spectral analysis of the sources in 1Ms catalog Chandra Deep Field South (CDFS) taking advantage optical spectroscopy and photometric redshifts for 321 extragalactic out total sample 347 sources. As default model, we adopt power law with slope Γ an intrinsic redshifted absorption NH, fixed Galactic unresolved Fe emission line. For 82 bright sources, are able to perform leaving both NH free. The weighted mean value is , distribution best fit values shows dispersion...
Aims. We present the full data set of spectroscopic campaign ESO/GOODS program in GOODS-South field, obtained with FORS2 spectrograph at ESO/VLT. Method. Objects were selected as candidates for VLT/FORS2 observations primarily based on expectation that detection and measurement their spectral features would benefit from high throughput resolution FORS2. The reliability redshift estimates is assessed using redshift-magnitude color-redshift diagrams, comparing results public data. Results....
We present the full data set of VIMOS spectroscopic campaign ESO/GOODS program in CDFS, which complements FORS2 campaign. The GOODS/VIMOS is structured two separate surveys using different grisms. Low Resolution Blue (LR-Blue) and Medium (MR) orange grisms have been used to cover redshift ranges. LR-Blue aimed at observing galaxies mainly 1.8<z<3.5, while MR aims z<1 Lyman Break Galaxies (LBGs) z>3.5. consists 20 masks. This release adds 8 new masks previous (12 masks, Popesso et al. 2009)....
We present a joint shear-and-magnification weak-lensing analysis of sample 16 X-ray-regular and 4 high-magnification galaxy clusters at 0.19 ≲ z 0.69 selected from the Cluster Lensing And Supernova survey with Hubble (CLASH). Our uses wide-field multi-color imaging, taken primarily Suprime-Cam on Subaru Telescope. From stacked-shear-only X-ray-selected subsample, we detect ensemble-averaged lensing signal total signal-to-noise ratio ≃ 25 in radial range 200–3500 kpc h−1, providing integrated...
Growing observational evidence now indicates that nebular line emission has a significant impact on the rest-frame optical fluxes of z~5-7 galaxies observed with Spitzer. This makes appear more massive, lower specific star formation rates. However, corrections for this have been very difficult to perform reliably due huge uncertainties overall strength such at z>~5.5. Here, we present most direct yet ubiquitous high-EW [OIII]+Hbeta in Lyman-break z~7, while also presenting strategy an...
We study the star formation and mass assembly process of 0.3<=z<2.5 galaxies using their IR emission from MIPS 24um band. used an updated version GOODS-MUSIC catalog, extended by addition mid-IR fluxes. compared two different estimators Star Formation Rate: total infrared derived 24um, estimated both synthetic empirical templates, multiwavelength fit to full galaxy SED. For estimates, we computed SFR Density Specific SFR. The tracers are roughly consistent, given uncertainties involved....
The galaxy stellar mass function (GSMF) at high-z provides key information on star-formation history and assembly in the young Universe. We aimed to use unique combination of deep optical/NIR/MIR imaging provided by HST, Spitzer VLT CANDELS-UDS, GOODS-South, HUDF fields determine GSMF over redshift range 3.5<z<7.5. utilised HST WFC3/IR NIR from CANDELS HUDF09, reaching H~27-28.5 a total area 369 arcmin2, with associated ACS optical data, IRAC SEDS programme, Y K-band Hawk-I images HUGS...
We present the results of a first search for galaxy candidates at z$\sim$9--15 on deep seven-bands NIRCam imaging acquired as part GLASS-JWST Early Release Science Program flanking field Frontier Fields cluster A2744. Candidates are selected via two different renditions Lyman-break technique, isolating objects z$\sim$9-11, and z$\sim$9-15, respectively, supplemented by photometric redshifts obtained with independent codes. find five color-selected z$>$9, plus one additional candidate...
The GLASS James Webb Space Telescope Early Release Science (hereafter GLASS-JWST-ERS) Program will obtain and make publicly available the deepest extragalactic data of ERS campaign. It is primarily designed to address two key science questions, namely, "what sources ionized universe when?" "how do baryons cycle through galaxies?", while also enabling a broad variety first look scientific investigations. In primary mode, it NIRISS NIRSpec spectroscopy galaxies lensed by foreground Hubble...
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 report the detection of a high density redshift $z\approx 10$ galaxies behind foreground cluster Abell 2744, selected from imaging data obtained recently with NIRCam onboard {\it JWST} by three programs -- GLASS-JWST, UNCOVER, and DDT\#2756. To ensure robust estimates lensing magnification $\mu$, we use an improved version our model that exploits first epoch images newly MUSE spectra, avoids regions $\mu>5$ where uncertainty may be higher. detect seven bright demagnified rest-frame $-22...
Abstract We present the spectroscopic confirmation of a protocluster at z = 7.88 behind galaxy cluster Abell 2744 (hereafter A2744-z7p9OD). Using JWST NIRSpec, we find seven galaxies within projected radius 60 kpc. Although reside in an overdensity around ≳20× greater than random volume, they do not show strong Ly α emission. place 2 σ upper limits on rest-frame equivalent width <16–28 Å. Based tight to emission, constrain volume-averaged neutral fraction hydrogen intergalactic medium be...
Ultraviolet light from early galaxies is thought to have ionized gas in the intergalactic medium. However, there are few observational constraints on this epoch because of faintness those and redshift their optical into infrared. We report observation, JWST imaging, a distant galaxy that magnified by gravitational lensing. spectroscopy galaxy, at rest-frame wavelengths, detects strong nebular emission lines attributable oxygen hydrogen. The measured z = 9.51 ± 0.01, corresponding 510 million...
Abstract We exploit James Webb Space Telescope (JWST) NIRCam observations from the GLASS-JWST-Early Release Science program to investigate galaxy stellar masses at z > 7. first show that JWST reduce uncertainties on mass by a factor of least 5–10, when compared with highest-quality data sets available date. then study UV mass-to-light ratio, finding galaxies exhibit two orders magnitude range M / L values for given luminosity, indicative broad variety physical conditions and star...
Star cluster formation in the early universe and their contribution to reionization remains date largely unconstrained. Here we present JWST/NIRCam imaging of most highly magnified galaxy known at z ~ 6, Sunrise arc. We identify six young massive star clusters (YMCs) with measured radii spanning 20 pc down 1 (corrected for lensing magnification), estimated stellar masses $10^{(6-7)}$ Msun, ages 1-30 Myr based on SED fitting photometry 8 filters extending rest-frame 7000A. The resulting mass...