A5021051663- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Advanced X-ray Imaging Techniques
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Medical Imaging Techniques and Applications
University of Ferrara
2016-2025
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2020-2023
National Institute for Astrophysics
2020-2023
University of Zurich
2023
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2020-2023
Osservatorio astronomico di Bologna
2017-2021
Centrum Badań Kosmicznych
2018
Polish Academy of Sciences
2018
Istanbul University
2018
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, over approximate redshift (z) range 8--1.5. It will image >250,000 distant galaxies using three separate cameras on Hubble Space Telescope, from mid-ultraviolet near-infrared, and find measure Type Ia supernovae at z>1.5 test their accuracy as standardizable candles for cosmology. Five premier multi-wavelength sky regions are selected, each with...
We present Advanced Camera for Surveys, NICMOS, and Keck adaptive-optics-assisted photometry of 20 Type Ia supernovae (SNe Ia) from the Hubble Space Telescope (HST) Cluster Supernova Survey. The SNe were discovered over redshift interval 0.623 < z 1.415. Of these Ia, 14 pass our strict selection cuts are used in combination with world's sample to derive best current constraints on dark energy. new 10 beyond = 1, thereby nearly doubling statistical weight HST-discovered this redshift. Our...
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...
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...
[abridged] We present point-source catalogs for the 4Ms Chandra Deep Field-South (CDF-S), which is deepest survey to date and covers an area of 464.5 arcmin^2. provide a main source catalog, contains 740 X-ray point sources that are detected with wavdetect at false-positive probability threshold 1E-5 also satisfy binomial-probability source-selection criterion P<0.004; this approach designed maximize number reliable detected. A total 300 main-catalog new compared previous 2Ms CDF-S sources....
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)....
In the construction of an X-ray-selected sample galaxy clusters for cosmological studies, we have assembled a 495 X-ray sources found to show extended emission in first processing ROSAT All-Sky Survey. The covers celestial region with declination δ ≥ 0° and Galactic latitude |bII| 20° comprises count rate ≥0.06 counts s-1 source extent likelihood L 7. optical follow-up identification program find 378 (76%) these be galaxies.
We combine ultradeep optical spectroscopy from the GMASS project ("Galaxy Mass Assembly Spectroscopic Survey") with GOODS multi-band photometry and HST imaging to study a sample of passive galaxiesat 1.39<z<1.99 selected at 4.5 microns. A stacked spectrum an equivalent integration time ~500 hours was obtained is publicly released. The spectral photometric SED properties indicate very weak or absent star formation, moderately old stellar ages ~1 Gyr (for solar metallicity) masses in range...
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...
We present new improved constraints on the Hubble parameter H ( z ) in redshift range 0.15 < 1.1, obtained from differential spectroscopic evolution of early-type galaxies as a function redshift. extract large sample ∼ 11000) several surveys, spanning almost 8 billion years cosmic lookback time (0.15 1.42). select most massive, red elliptical galaxies, passively evolving and without signature ongoing star formation. Those can be used standard chronometers, firstly proposed by Jimenez...
▪ Abstract Considerable progress has been made over the past decade in study of evolutionary trends population galaxy clusters Universe. In this review we focus on observations X-ray band. surveys with ROSAT satellite, supplemented by follow-up studies ASCA and Beppo-SAX, have allowed an assessment evolution space density out to z ≈ 1 physical properties intracluster medium 0.5. With advent Chandra Newton-XMM their unprecedented sensitivity angular resolution, these extended beyond redshift...
We measure the morphology--density relation (MDR) and morphology-radius (MRR) for galaxies in seven z ~ 1 clusters that have been observed with Advanced Camera Surveys on board Hubble Space Telescope. Simulations independent comparisons of ourvisually derived morphologies indicate ACS allows one to distinguish between E, S0, spiral down zmag = 24, corresponding L/L* 0.21 0.30 at 0.83 1.24, respectively. adopt density radius estimation methods match those used lower redshift order study...
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...
We present a candidate for the most distant galaxy known to date with photometric redshift of z = 10.7+0.6−0.4 (95% confidence limits; < 9.5 galaxies types ruled out at 7.2σ). This J-dropout Lyman break galaxy, named MACS0647-JD, was discovered as part Cluster Lensing and Supernova survey Hubble (CLASH). observe three magnified images this due strong gravitational lensing by cluster MACSJ0647.7+7015 0.591. The are factors ∼80, 7, 2, brighter two observed ∼26th magnitude AB (∼0.15 μJy) in...
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 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...
Abstract The detection of the accelerated expansion Universe has been one major breakthroughs in modern cosmology. Several cosmological probes (Cosmic Microwave Background, Supernovae Type Ia, Baryon Acoustic Oscillations) have studied depth to better understand nature mechanism driving this acceleration, and they are being currently pushed their limits, obtaining remarkable constraints that allowed us shape standard model. In parallel that, however, percent precision achieved recently...