L. Napolitano
A5028243157- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Remote Sensing in Agriculture
- Differential Equations and Numerical Methods
- Real-time simulation and control systems
- Spectroscopy and Chemometric Analyses
- Radio Wave Propagation Studies
- Astrophysical Phenomena and Observations
- Advanced Optical Sensing Technologies
- Atmospheric Ozone and Climate
- Spacecraft Design and Technology
- Optical Network Technologies
- Calibration and Measurement Techniques
- Iterative Methods for Nonlinear Equations
- Remote Sensing and LiDAR Applications
- Astrophysics and Cosmic Phenomena
Wyoming Department of Education
2024-2025
University of Wyoming
2022-2024
National Institute for Astrophysics
2023
In 2021 May, the Dark Energy Spectroscopic Instrument (DESI) began a 5 yr survey of approximately 50 million total extragalactic and Galactic targets. The primary DESI dark-time targets are emission line galaxies (ELGs), luminous red (LRGs) quasars (QSOs). bright time, will focus on two surveys known as Bright Galaxy Survey (BGS) Milky Way (MWS). also observes selection "secondary" for bespoke science goals. This paper gives an overview publicly available pipeline (desitarget) used to...
Abstract A key component of the Dark Energy Spectroscopic Instrument (DESI) survey validation (SV) is a detailed visual inspection (VI) optical spectroscopic data to quantify metrics. In this paper we present results from VI quasar using deep coadded SV spectra. We show that majority (≈70%) main-survey targets are spectroscopically confirmed as quasars, with ≈16% galaxies, ≈6% stars, and ≈8% low-quality spectra lacking reliable features. nonnegligible fraction quasars misidentified by...
ABSTRACT The 1D power spectrum P1D of the Ly α forest provides important information about cosmological and astrophysical parameters, including constraints on warm dark matter models, sum masses three neutrino species, thermal state intergalactic medium. We present first measurement with quadratic maximum likelihood estimator (QMLE) from Dark Energy Spectroscopic Instrument (DESI) survey early data sample. This sample 54 600 quasars is already comparable in size to largest previous studies,...
Abstract We present the technical details on how large-scale structure (LSS) catalogs are constructed from redshifts measured spectra observed by Dark Energy Spectroscopic Instrument (DESI). The LSS provide information needed to determine relative number density of DESI tracers as a function redshift and celestial coordinates and, e.g., clustering statistics. produce that weighted subsamples data, each matched `random' catalog forms an unclustered sampling probability could have those data...
Abstract A critical requirement of spectroscopic large scale structure analyses is correcting for selection which galaxies to observe from an isotropic target list. This often limited by the hardware used perform survey will impose angular constraints simultaneously observable targets, requiring multiple passes all them. In SDSS this manifested solely as collision physical fibers and plugs placed in plates. DESI, there additional constraint robotic positioner controls each fiber being a...
ABSTRACT We present the one-dimensional Ly α forest power spectrum measurement using first data provided by Dark Energy Spectroscopic Instrument (DESI). The sample comprises 26 330 quasar spectra, at redshift z > 2.1, contained in DESI Early Data Release and 2 months of main survey. employ a Fast Fourier Transform (FFT) estimator compare resulting to an alternative likelihood-based method companion paper. investigate methodological instrumental contaminants associated with new...
ABSTRACT We present and validate the catalogue of Lyman-α forest fluctuations for 3D analyses using Early Data Release (EDR) from Dark Energy Spectroscopic Instrument (DESI) survey. used 88 511 quasars collected DESI Survey Validation (SV) data first two months main survey (M2). several improvements to method extract absorption performed in previous Sloan Digital Sky (SDSS). In particular, we modify weighting scheme show that it can improve precision correlation function measurement by more...
A critical requirement of spectroscopic large scale structure analyses is correcting for selection which galaxies to observe from an isotropic target list. This often limited by the hardware used perform survey will impose angular constraints simultaneously observable targets, requiring multiple passes all them. In SDSS this manifested solely as collision physical fibers and plugs placed in plates. DESI, there additional constraint robotic positioner controls each fiber being a finite patrol...
Abstract We present the first measurements of Lyman- α (Ly ) forest correlations using early data from Dark Energy Spectroscopic Instrument (DESI). measure auto-correlation Ly absorption 88 509 quasars at z > 2, and its cross-correlation with a further 147 899 tracer ≳ 1.77. Then, we fit these 13-parameter model based on linear perturbation theory find that it provides good description across broad range scales. detect BAO peak signal-to-noise ratio 3.8 σ , show our auto-...
The Dark Energy Spectroscopic Instrument (DESI) data release 2 (DR2) galaxy and quasar clustering represents a significant expansion of from DR1, providing improved statistical precision in BAO constraints across multiple tracers, including bright galaxies (BGS), luminous red (LRGs), emission line (ELGs), quasars (QSOs). In this paper, we validate the analysis DR2. We present results robustness tests on blinded DR2 and, after unblinding, consistency checks unblinded data. All are compared to...
Aims. We investigate the production efficiency of ionizing photons ( ξ ion ∗ ) 1174 galaxies with secure redshift at z = 2 − 5 from VANDELS survey to determine relation between emission and physical properties bright massive sources. Methods. constrained galaxy parameters by means spectrophotometric fits performed BEAGLE code. The analysis exploits multi-band photometry in fields measurement UV rest-frame lines (CIII] λ 1909, HeII 1640, OIII] 1666) deep VIMOS spectra. Results. find no clear...
Abstract We present findings of the detection Magnesium II (Mg ii , λ = 2796, 2803 Å) absorbers from early data release Dark Energy Spectroscopic Instrument (DESI). DESI is projected to obtain spectroscopy approximately 3 million quasars (QSOs), which over 99% are anticipated be at redshifts greater than z > 0.3, such that would able observe an associated or intervening Mg absorber illuminated by background QSO. have developed autonomous supplementary spectral pipeline detects these...
The one-dimensional power spectrum $P_{\mathrm{1D}}$ of the Ly$\alpha$ forest provides important information about cosmological and astrophysical parameters, including constraints on warm dark matter models, sum masses three neutrino species, thermal state intergalactic medium. We present first measurement with quadratic maximum likelihood estimator (QMLE) from Dark Energy Spectroscopic Instrument (DESI) survey early data sample. This sample $54~600$ quasars is already comparable in size to...
We present the JWST/NIRSpec PRISM follow-up of candidate galaxies at zsimeq 9-11 selected from deep JWST/NIRCam photometry in GLASS-JWST Early Release Science data. spectroscopically confirm six sources with secure redshifts z = 9.52–10.43, each showing multiple emission lines. An additional object is likely simeq 10.66, based on its and a single feature, while one source lower-redshift interloper. The sample includes first JWST-detected zsim 10, GHZ1/GLASS-z10, which we 9.875, X-ray...
We present the one-dimensional Lyman-$\alpha$ forest power spectrum measurement using first data provided by Dark Energy Spectroscopic Instrument (DESI). The sample comprises $26,330$ quasar spectra, at redshift $z > 2.1$, contained in DESI Early Data Release and two months of main survey. employ a Fast Fourier Transform (FFT) estimator compare resulting to an alternative likelihood-based method companion paper. investigate methodological instrumental contaminants associated new instrument,...
We present the first measurements of Lyman-$\alpha$ (Ly$\alpha$) forest correlations using early data from Dark Energy Spectroscopic Instrument (DESI). measure auto-correlation Ly$\alpha$ absorption 88,509 quasars at $z>2$, and its cross-correlation with a further 147,899 tracer $z\gtrsim1.77$. Then, we fit these 13-parameter model based on linear perturbation theory find that it provides good description across broad range scales. detect BAO peak signal-to-noise ratio $3.8\sigma$, show our...
Abstract We explore the influence of radio-mode feedback on properties cool circumgalactic medium (CGM). To this end, we assemble a statistical sample approximately 30,000 radio galaxies with background quasars by combining optical spectroscopic measurements luminous red and from year 1 data set Dark Energy Spectroscopic Instrument sources LOw-Frequency ARray Two-metre Sky Survey (LoTSS) DR2 catalog Very Large Array (VLASS) quick-look catalog. Galaxies similar but no counterparts in LoTSS...
We present JWST/NIRSpec PRISM follow-up of candidate galaxies at z=9-11 selected from deep JWST/NIRCam photometry in GLASS-JWST Early Release Science data. spectroscopically confirm six sources with secure redshifts z = 9.52-10.43, each showing multiple emission lines. An additional object is likely 10.66, based on its Lya-break and a single feature, while one source lower redshift interloper. The sample includes the first JWST-detected z=10, GHZ1/GLASS-z10, which we 9.875, X-ray detected...
We explore the influence of radio-mode feedback on properties cool circumgalactic medium (CGM). To this end, we assemble a statistical sample approximately 30,000 radio galaxies with background quasars by combining optical spectroscopic measurements luminous red (LRGs) and from year 1 dataset Dark Energy Spectroscopic Instrument (DESI) sources LOw-Frequency ARray Two-metre Sky Survey (LoTSS) DR2 catalog Very Large Array (VLASS) quick look catalog. Galaxies similar but no counterparts in...
In this paper, we study how absorption-line systems affect the spectra and redshifts of quasars (QSOs), using catalogs Mg II absorbers from early data release (EDR) first (DR1) Dark Energy Spectroscopic Instrument (DESI). We determine reddening effect an absorption system by fitting un-reddened template spectrum to a sample 50,674 QSO that contain absorbers. find caused intervening (voff > 3500 km/s) has average color excess E(B-V) = 0.04 magnitudes. tends be greater for at low redshifts, or...
We present findings of the detection Magnesium II (Mg II, λ = 2796, 2803 Å) absorbers from early data release Dark Energy Spectroscopic Instrument (DESI). DESI is projected to obtain spectroscopy approximately 3 million quasars (QSOs), which over 99% are anticipated be at redshifts greater than z > 0.3, such that would able observe an associated or intervening Mg absorber illuminated by background QSO. have developed autonomous supplementary spectral pipeline detects these systems through...