S. Desai
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View article: Dark Energy Survey Year 3 results: <i>w</i> CDM cosmology from simulation-based inference with persistent homology on the sphere
Dark Energy Survey Year 3 results: <i>w</i> CDM cosmology from simulation-based inference with persistent homology on the sphere Open
We present cosmological constraints from Dark Energy Survey Year 3 (DES Y3) weak lensing data using persistent homology, a topological data analysis technique that tracks how features like clusters and voids evolve across density threshold…
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: 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: 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: 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
We introduce an updated To&Krause2021 model for joint analyses of cluster abundances and large-scale two-point correlations of weak lensing and galaxy and cluster clustering (termed CL+3x2pt analysis) and validate that this model meets the…
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: 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: 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…
View article: Euclid Quick Data Release (Q1). The first catalogue of strong-lensing galaxy clusters
Euclid Quick Data Release (Q1). The first catalogue of strong-lensing galaxy clusters Open
We present the first catalogue of strong lensing galaxy clusters identified in the Euclid Quick Release 1 observations (covering $63.1\,\mathrm{deg^2}$). This catalogue is the result of the visual inspection of 1260 cluster fields. Each ga…
View article: Euclid Quick Data Release (Q1) Exploring galaxy properties with a multi-modal foundation model
Euclid Quick Data Release (Q1) Exploring galaxy properties with a multi-modal foundation model Open
Modern astronomical surveys, such as the Euclid mission, produce high-dimensional, multi-modal data sets that include imaging and spectroscopic information for millions of galaxies. These data serve as an ideal benchmark for large, pre-tra…
View article: Euclid Quick Data Release (Q1): The evolution of the passive-density and morphology-density relations between $z=0.25$ and $z=1$
Euclid Quick Data Release (Q1): The evolution of the passive-density and morphology-density relations between $z=0.25$ and $z=1$ Open
The extent to which the environment affects galaxy evolution has been under scrutiny by researchers for decades. With the first data from Euclid, we can begin to study a wide range of environments and their effects as a function of redshif…
View article: Euclid: Quick Data Release (Q1) -- A census of dwarf galaxies across a range of distances and environments
Euclid: Quick Data Release (Q1) -- A census of dwarf galaxies across a range of distances and environments Open
The Euclid Q1 fields were selected for calibration purposes in cosmology and are therefore relatively devoid of nearby galaxies. However, this is precisely what makes them interesting fields in which to search for dwarf galaxies in local d…
View article: Constraint on Lorentz invariance violation for spectral lag transition in GRB 160625B using profile likelihood
Constraint on Lorentz invariance violation for spectral lag transition in GRB 160625B using profile likelihood Open
We reanalyze the spectral lag data for GRB 160625B using frequentist inference in order to constrain the energy scale $$(E_{QG})$$ of Lorentz Invariance Violation (LIV). For this purpose, we use profile likelihood to deal with the …
View article: Reduction of the type Ia supernova host galaxy step in the outer regions of galaxies
Reduction of the type Ia supernova host galaxy step in the outer regions of galaxies Open
Using 1533 type Ia supernovae (SNe Ia) from the five-year sample of the Dark Energy Survey (DES), we investigate the relationship between the projected galactocentric separation of the SNe and their host galaxies and their light curves and…
View article: Determination of Hubble constant from Megamaser Cosmology Project using Profile Likelihood
Determination of Hubble constant from Megamaser Cosmology Project using Profile Likelihood Open
The Megamaser Cosmology Project inferred a value for the Hubble constant given by $H_0=73.9 \pm 3.0 $ km/sec/Mpc. This value was obtained using Bayesian inference by marginalizing over six nuisance parameters, corresponding to the velociti…
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. Sta…