Explanipedia

Space Odyssey: The Afterlife of a Crewmate – A Platformer Game Experience in Outer Space Open

Noor Ul Amin Jhanjhi, M. Bhattacharjee, Ahmed M. Mohamed, S. A. Usman, Rashid Khan , et al. · 2025

Chemical Abundances in the Metal-Poor Globular Cluster ESO 280-SC06: A Formerly Massive, Tidally Disrupted Globular Cluster Open

S. A. Usman, Alexander P. Ji, Jandrie Rodriguez, Jeffrey D. Simpson, Sarah L. Martell , et al. · 2025

We present the first high-resolution abundance study of ESO 280-SC06, one of the least luminous and most metal-poor gravitationally bound Milky Way globular clusters. Using Magellan/MIKE spectroscopy for ten stars, we confirm the cluster’s…

Chemical Abundances in the Metal-Poor Globular Cluster ESO 280-SC06: A Formerly Massive, Tidally Disrupted Globular Cluster Open

S. A. Usman, Alexander P. Ji, Jandrie Rodriguez, Jeffrey D. Simpson, Sarah L. Martell , et al. · 2025

We present the first high-resolution abundance study of ESO 280-SC06, one of the least luminous and most metal-poor gravitationally bound Milky Way globular clusters. Using Magellan/MIKE spectroscopy for ten stars, we confirm the cluster's…

Chemical Abundances in the Leiptr Stellar Stream: A Disrupted Ultra-faint Dwarf Galaxy? Open

Kaia R. Atzberger, S. A. Usman, Alexander P. Ji, Lara R. Cullinane, Denis Erkal , et al. · 2025

Chemical abundances of stellar streams can be used to determine the nature of a stream’s progenitor. Here we study the progenitor of the recently discovered Leiptr stellar stream, which was previously suggested to be a tidally disrupted ha…

Flipping of the Tidal Tails of the Ophiuchus Stream due to the Decelerating Galactic Bar Open

Yong Yang, Geraint F. Lewis, Denis Erkal, Ting S. Li, A. Li , et al. · 2025

The Ophiuchus stellar stream presents a puzzle due to its complicated morphology, with a substructure perpendicular to the main track (spur), a broadened tail (fanning), and a shorter than expected angular extent given its old stellar popu…

Optimized Digital Signal Processing Techniques for Enhanced Computational Efficiency Open

S. A. Usman, M. Bhattacharjee, Rashid Khan, Xu Jiashun, Noor Ul Amin · 2025

Digital Signal Processing (DSP) is an integral part of modern computing applications like telecommunications, biomedical engineering, and multimedia systems. The efficiency of DSP algorithms plays a critical role in ensuring real-time proc…

High-Performance Computing: Evaluating Computing Paradigms, Scalability, and Real-World Applications Open

M. Bhattacharjee, Mohamed Muzni Mohamed Ziham, Rashid Khan, S. A. Usman, Mohamed Zeedhan , et al. · 2025

High-Performance Computing (HPC) revolutionized the field of computational science by enabling it to process vast amounts of data and execute complex simulations at remarkable speed and efficiency. This paper describes various paradigms of…

Identifying the Best-Selling Product using Machine Learning Algorithms Open

S. A. Usman, M. Bhattacharjee, Ahmed Abdullah Alsukhailah, Aamir Shahzad, Muhammad Shabir Abdul Razick , et al. · 2025

This research covers the application of machine learning algorithms in identifying best-selling products to enhance sales forecasting among SMEs. Given the limitations of operational scales and the poor derivation of insights from sales da…

<i>S</i><sup>5</sup>: New insights from deep spectroscopic observations of the tidal tails of the globular clusters NGC 1261 and NGC 1904 Open

Petra Awad, Ting S. Li, Denis Erkal, R. F. Peletier, Kerstin Bunte , et al. · 2024

As globular clusters (GCs) orbit the Milky Way, their stars are tidally stripped and form tidal tails that follow the orbit of the cluster around the Galaxy. The morphology of these tails is complex and shows correlations with the phase of…

$S^5$: New insights from deep spectroscopic observations of the tidal tails of the globular clusters NGC 1261 and NGC 1904 Open

P. Awad, Ting S. Li, Denis Erkal, R. F. Peletier, Kerstin Bunte , et al. · 2024

As globular clusters (GCs) orbit the Milky Way, their stars are tidally stripped forming tidal tails that follow the orbit of the clusters around the Galaxy. The morphology of these tails is complex and shows correlations with the phase of…

Chemical Abundances in the Leiptr Stellar Stream: A Disrupted Ultra-faint Dwarf Galaxy? Open

Kaia R. Atzberger, S. A. Usman, Alexander P. Ji, Lara R. Cullinane, Denis Erkal , et al. · 2024

Chemical abundances of stellar streams can be used to determine the nature of a stream’s progenitor. Here we study the progenitor of the recently discovered Leiptr stellar stream, which was previously suggested to be a tidally disrupted ha…

Extending the chemical reach of the H3 survey: detailed abundances of the dwarf-galaxy stellar stream Wukong/LMS-1 Open

Guilherme Limberg, Alexander P. Ji, Rohan P. Naidu, Anirudh Chiti, Silvia Rossi , et al. · 2024

We present the first detailed chemical-abundance analysis of stars from the dwarf-galaxy stellar stream Wukong/LMS-1 covering a wide metallicity range ($-3.5 \lt \rm [Fe/H] \lesssim -1.3$). We find abundance patterns that are effectively i…

Inferring dark matter subhalo properties from simulated subhalo-stream encounters Open

Tariq Hilmi, Denis Erkal, S. E. Koposov, Ting S. Li, Sophia Lilleengen , et al. · 2024

In the cold dark matter paradigm, our Galaxy is predicted to contain >10000 dark matter subhaloes in the $10^5-10^8M_\odot$ range which should be completely devoid of stars. Stellar streams are sensitive to the presence of these subhaloes,…

Spectacular Nucleosynthesis from Early Massive Stars Open

Alexander P. Ji, Sanjana Curtis, Nicholas Storm, Vedant Chandra, Kevin C. Schlaufman , et al. · 2024

Stars that formed with an initial mass of over 50 M ⊙ are very rare today, but they are thought to be more common in the early Universe. The fates of those early, metal-poor, massive stars are highly uncertain. Most are expected to directl…

Multiple populations and a CH star found in the 300S globular cluster stellar stream Open

S. A. Usman, Alexander P. Ji, Ting S. Li, Andrew B. Pace, Lara R. Cullinane , et al. · 2024

Milky Way globular clusters (GCs) display chemical enrichment in a phenomenon called multiple stellar populations (MSPs). While the enrichment mechanism is not fully understood, there is a correlation between a cluster’s mass and the fract…

Multiple Populations and a CH Star Found in the 300S Globular Cluster Stellar Stream Open

S. A. Usman, Alexander P. Ji, Ting S. Li, Andrew B. Pace, Lara R. Cullinane , et al. · 2024

Milky Way globular clusters (GCs) display chemical enrichment in a phenomenon called multiple stellar populations (MSPs). While the enrichment mechanism is not fully understood, there is a correlation between a cluster's mass and the fract…

Spectacular nucleosynthesis from early massive stars Open

Alexander P. Ji, Sanjana Curtis, Nicholas Storm, Vedant Chandra, Kevin C. Schlaufman , et al. · 2024

Stars formed with initial mass over 50 Msun are very rare today, but they are thought to be more common in the early universe. The fates of those early, metal-poor, massive stars are highly uncertain. Most are expected to directly collapse…

Simple parameter estimation using observable features of gravitational-wave signals Open

S. Fairhurst, C. G. Hoy, R. Green, J. C. Mills, S. A. Usman · 2023

Using simple, intuitive arguments, we discuss the expected accuracy with which astrophysical parameters can be extracted from an observed gravitational wave signal. The observation of a chirplike signal in the data allows for measurement o…

Extending the Chemical Reach of the H3 Survey: Detailed Abundances of the Dwarf-galaxy Stellar Stream Wukong/LMS-1 Open

Guilherme Limberg, Alexander P. Ji, Rohan P. Naidu, Anirudh Chiti, Silvia Rossi , et al. · 2023

We present the first detailed chemical-abundance analysis of stars from the dwarf-galaxy stellar stream Wukong/LMS-1 covering a wide metallicity range ($-3.5 < \rm[Fe/H] \lesssim -1.3$). We find abundance patterns that are effectively indi…

Simple parameter estimation using observable features of gravitational-wave signals Open

S. Fairhurst, C. G. Hoy, Rhys E. Green, J. C. Mills, S. A. Usman · 2023

Using simple, intuitive arguments, we discuss the expected accuracy with which astrophysical parameters can be extracted from an observed gravitational wave signal. The observation of a chirplike signal in the data allows for measurement o…

Rapid parameterization and estimated inclination of gravitational waves from binary systems Open

S. A. Usman · 2018

The Laser Interferometer Gravitational-Wave Observatory (LIGO) has suc-cessfully started the era of gravitational-wave astronomy with its ground-breaking detections of gravitational waves. These signals have opened the doorto a new way to …

The PyCBC search for gravitational waves from compact binary coalescence Open

S. A. Usman, A. Nitz, I. W. Harry, Christopher M. Biwer, D. Brown , et al. · 2016

We describe the PyCBC search for gravitational waves from compactobject binary coalescences in advanced gravitational-wave detector data. The search was used in the first Advanced LIGO observing run and unambiguously identified two black h…

An improved pipeline to search for gravitational waves from compact binary coalescence Open

S. A. Usman, A. Nitz, I. W. Harry, Christopher M. Biwer, D. Brown , et al. · 2015

The second generation of ground-based gravitational-wave detectors will begin taking data in September 2015. Sensitive and computationally-efficient data analysis methods will be required to maximize what we learn from their observations. …

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