S. Desai
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View article: Revisiting wideband pulsar timing measurements
Revisiting wideband pulsar timing measurements Open
In the wideband paradigm of pulsar timing, the time of arrival of a pulsar pulse is measured simultaneously with the corresponding dispersion measure from a frequency-resolved integrated pulse profile. We present a new method for performin…
View article: A Targeted Gamma-Ray Search of Five Prominent Galaxy Merger Systems with 17 years of Fermi-LAT Data
A Targeted Gamma-Ray Search of Five Prominent Galaxy Merger Systems with 17 years of Fermi-LAT Data Open
Galaxy mergers are among the most energetic astrophysical phenomena, driving intense star formation and potentially fueling cosmic ray acceleration, which can produce high energy -ray emission through hadronic processes. We present a tar…
View article: \textit{Euclid}: From Galaxies to Gravitational Waves -- Forecasting Stochastic Gravitational Wave Background Anisotropies and Their Cross-Correlation
\textit{Euclid}: From Galaxies to Gravitational Waves -- Forecasting Stochastic Gravitational Wave Background Anisotropies and Their Cross-Correlation Open
We estimate the amplitude and spatial anisotropy in the stochastic gravitational wave background (SGWB) energy density due to compact binary coalescence (CBC) events: binary black holes (BBH), binary neutron stars (BNS), and black hole-neu…
View article: A Test of Amati Relation Using HII Galaxy Distances
A Test of Amati Relation Using HII Galaxy Distances Open
We use model-independent luminosity distances of 186 HII galaxy observations to address the circularity problem in the Amati relation for Gamma-ray Bursts (GRBs). For this purpose, we used Artificial Neural Network-based interpolation to r…
View article: Euclid Quick Data Release (Q1): Hunting for luminous z > 6 galaxies in the Euclid Deep Fields -- forecasts and first bright detections
Euclid Quick Data Release (Q1): Hunting for luminous z > 6 galaxies in the Euclid Deep Fields -- forecasts and first bright detections Open
The evolution of the rest-frame ultraviolet luminosity function (UV LF) is a powerful probe of early star formation and stellar mass build-up. At z > 6, its bright end (MUV < -21) remains poorly constrained due to the small volumes of exis…
View article: Euclid: Quick Data Release (Q1)- The connection between galaxy close encounters and radio activity
Euclid: Quick Data Release (Q1)- The connection between galaxy close encounters and radio activity Open
Using the large statistics provided by both Euclid and the LOFAR surveys, we present the first large-scale study of the connection between radio emission, its morphology, and the merging properties of the hosts of radio sources up to z=2. …
View article: Euclid Quick Data Release (Q1). Spectroscopic unveiling of highly ionised lines at z = 2.48-3.88
Euclid Quick Data Release (Q1). Spectroscopic unveiling of highly ionised lines at z = 2.48-3.88 Open
This study explores a rare population of sources in a currently uncharted region of spectroscopic redshift space in the Euclid Quick Data Release (Q1), and is intended potentially to support upcoming spectroscopic studies. Our goal is to i…
View article: Euclid: Systematic uncertainties from the halo mass conversion on galaxy cluster number count data analyses
Euclid: Systematic uncertainties from the halo mass conversion on galaxy cluster number count data analyses Open
The large catalogues of galaxy clusters expected from the Euclid survey will enable cosmological analyses of cluster number counts that require accurate cosmological model predictions. One possibility is to use parametric fits calibrated a…
View article: Dark Energy Survey Year 6 Results: Clustering-redshifts and importance sampling of Self-Organised-Maps $n(z)$ realizations for $3\times2$pt samples
Dark Energy Survey Year 6 Results: Clustering-redshifts and importance sampling of Self-Organised-Maps $n(z)$ realizations for $3\times2$pt samples Open
This work is part of a series establishing the redshift framework for the $3\times2$pt analysis of the Dark Energy Survey Year 6 (DES Y6). For DES Y6, photometric redshift distributions are estimated using self-organizing maps (SOMs), cali…
View article: Euclid preparation: The flat-sky approximation for the clustering of Euclid's photometric galaxies
Euclid preparation: The flat-sky approximation for the clustering of Euclid's photometric galaxies Open
We compare the performance of the flat-sky approximation and Limber approximation for the clustering analysis of the photometric galaxy catalogue of Euclid. We study a 6 bin configuration representing the first data release (DR1) and a 13 …
View article: Euclid: Exploring observational systematics in cluster cosmology -- a comprehensive analysis of cluster counts and clustering
Euclid: Exploring observational systematics in cluster cosmology -- a comprehensive analysis of cluster counts and clustering Open
This study explores the impact of observational and modelling systematic effects on cluster number counts and cluster clustering and provides model prescriptions for their joint analysis, in the context of the \Euclid survey. Using 1000 \E…
View article: Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS
Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS Open
We present a search for $z\simeq7$ Lyman-break galaxies using the $1.72 \, \rm{deg}^2$ near-infrared UltraVISTA survey in the COSMOS field, reaching $5\,σ$ depths in $Y$ of 26.2. We incorporate deep optical and Spitzer imaging for a full s…
View article: Euclid preparation. Predicting star-forming galaxy scaling relations with the spectral stacking code SpectraPyle
Euclid preparation. Predicting star-forming galaxy scaling relations with the spectral stacking code SpectraPyle Open
We introduce SpectraPyle, a versatile spectral stacking pipeline developed for the Euclid mission's NISP spectroscopic surveys, aimed at extracting faint emission lines and spectral features from large galaxy samples in the Wide and Deep S…
View article: DELVE Milky Way Satellite Census I: Satellite Population and Survey Selection Function
DELVE Milky Way Satellite Census I: Satellite Population and Survey Selection Function Open
The properties of Milky Way satellite galaxies have important implications for galaxy formation, reionization, and the fundamental physics of dark matter. However, the population of Milky Way satellites includes the faintest known galaxies…
View article: Search for spatial coincidences between galaxy mergers and Fermi-LAT 4FGL-DR4 sources
Search for spatial coincidences between galaxy mergers and Fermi-LAT 4FGL-DR4 sources Open
View article: Dark Energy Survey Year 6 Results: improved mitigation of spatially varying observational systematics with masking
Dark Energy Survey Year 6 Results: improved mitigation of spatially varying observational systematics with masking Open
As photometric surveys reach unprecedented statistical precision, systematic uncertainties increasingly dominate large-scale structure probes relying on galaxy number density. Defining the final survey footprint is critical, as it excludes…
View article: Dark energy survey: Modeling strategy for multiprobe cluster cosmology and validation for the full six-year dataset
Dark energy survey: Modeling strategy for multiprobe cluster cosmology and validation for the full six-year dataset Open
International audience
View article: Euclid: Photometric redshift calibration with self-organising maps
Euclid: Photometric redshift calibration with self-organising maps Open
The Euclid survey aims to trace the evolution of cosmic structures up to redshift $z$ $\sim$ 3 and beyond. Its success depends critically on obtaining highly accurate mean redshifts for ensembles of galaxies $n(z)$ in all tomographic bins,…
View article: The Atacama Cosmology Telescope: DR6 Sunyaev-Zel'dovich Selected Galaxy Clusters Catalog
The Atacama Cosmology Telescope: DR6 Sunyaev-Zel'dovich Selected Galaxy Clusters Catalog Open
We present the results of a search for galaxy clusters in the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) microwave sky maps covering 16293 square degrees in three frequency bands, using data obtained over the lifetime of the pr…
View article: How Stable are the Impact Factors of Major Astrophysics Journals?
How Stable are the Impact Factors of Major Astrophysics Journals? Open
We examine the long-term impact factor over the past decade (2015–2024) for seven flagship journals widely used in astrophysics: ApJ, AJ, ApJL, ApJS, A&A, JCAP, and MNRAS. We checked the variation of both the traditional impact factor and …
View article: Constraints on dark energy models using late Universe probes
Constraints on dark energy models using late Universe probes Open
View article: Comparison of R<sub>h</sub> = ct and ΛCDM using DESI DR1 measurements
Comparison of R<sub>h</sub> = ct and ΛCDM using DESI DR1 measurements Open
We use DESI DR1 BAO measurements of the ratio of tranvserse comoving distance to Hubble distance in order to test the compatibility of over flat ΛCDM. For this purpose, we used Bayesian model selection to evaluate the efficacy of these mod…
View article: Constraints on Lorentz Invariance Violation from Gamma-Ray Burst Rest-Frame Spectral Lags Using Profile Likelihood
Constraints on Lorentz Invariance Violation from Gamma-Ray Burst Rest-Frame Spectral Lags Using Profile Likelihood Open
We reanalyze the spectral lag data for 56 Gamma-Ray Bursts (GRBs) in the cosmological rest frame to search for Lorentz Invariance Violation (LIV) using frequentist inference. For this purpose, we use the technique of profile likelihood to …
View article: A stacked analysis of GeV gamma-ray emission from SPT-SZ galaxy clusters with 16 years of Fermi-LAT data
A stacked analysis of GeV gamma-ray emission from SPT-SZ galaxy clusters with 16 years of Fermi-LAT data Open
View article: Post-glitch Recovery and the Neutron Star Structure: The Vela Pulsar
Post-glitch Recovery and the Neutron Star Structure: The Vela Pulsar Open
Pulsar glitches, sudden changes in a neutron star's rotation, offer a unique window into the extreme physics governing these celestial bodies. The post-glitch recovery phase, characterized by a gradual recovery, reveals insights into the s…
View article: High-significance detection of correlation between the unresolved gamma-ray background and the large-scale cosmic structure
High-significance detection of correlation between the unresolved gamma-ray background and the large-scale cosmic structure Open
Our understanding of the γ -ray sky has improved dramatically in the past decade, however, the unresolved γ -ray background (UGRB) still has a potential wealth of information about the faintest γ -ray sources pervading the Universe. Statis…
View article: Photometry of Outer Solar System Objects from the Dark Energy Survey. II. A Joint Analysis of Trans-Neptunian Absolute Magnitudes, Colors, Light Curves and Dynamics
Photometry of Outer Solar System Objects from the Dark Energy Survey. II. A Joint Analysis of Trans-Neptunian Absolute Magnitudes, Colors, Light Curves and Dynamics Open
For the 696 trans-Neptunian objects (TNOs) with absolute magnitudes 5.5 < H r < 8.2 detected in the Dark Energy Survey, we characterize the relationships between their dynamical state and physical properties—namely H r , indicating size; c…
View article: Effect of peak absolute magnitude of Type Ia supernovae and sound horizon values on the Hubble constant using DESI Data Release 1 results
Effect of peak absolute magnitude of Type Ia supernovae and sound horizon values on the Hubble constant using DESI Data Release 1 results Open
We apply data-motivated priors on the peak absolute magnitude of Type Ia supernovae ( M ) and the sound horizon at the drag epoch ( $$r_d$$ ), to study how the $$ M-r_d$$ degeneracy affects low redshift measurements of the Hubbl…
View article: Superclustering with the Atacama Cosmology Telescope and Dark Energy Survey. II. Anisotropic Large-scale Coherence in Hot Gas, Galaxies, and Dark Matter
Superclustering with the Atacama Cosmology Telescope and Dark Energy Survey. II. Anisotropic Large-scale Coherence in Hot Gas, Galaxies, and Dark Matter Open
Statistics that capture the directional dependence of the baryon distribution in the cosmic web enable unique tests of cosmology and astrophysical feedback. We use constrained oriented stacking of thermal Sunyaev–Zel’dovich (tSZ) maps to m…
View article: Euclid Quick Data Release (Q1). The Euclid view on Planck galaxy protocluster candidates: towards a probe of the highest sites of star formation at cosmic noon
Euclid Quick Data Release (Q1). The Euclid view on Planck galaxy protocluster candidates: towards a probe of the highest sites of star formation at cosmic noon Open
We search for galaxy protoclusters at redshifts $z > 1.5$ in the first data release (Q1) of the $\textit{Euclid}$ survey. We make use of the catalogues delivered by the $\textit{Euclid}$ Science Ground Segment (SGS). After a galaxy selecti…