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The SDSS-V Local Volume Mapper: Data Analysis Pipeline
Bizyaev, Dmitry; Blanc, Guillermo A.; Wofford, Aida +10 more
We introduce the data analysis pipeline (DAP) for the Sloan Digital Sky Survey V Local Volume Mapper (LVM) project, referred to as the LVM-DAP. We outline our methods for recovering both stellar and emission-line components from optical integral field spectroscopy, highlighting the developments and changes implemented to address specific challenge…
Hubble Space Telescope Observations within the Sphere of Influence of the Powerful Supermassive Black Hole in PKS 0745-191
Steiner, James F.; Natarajan, Priyamvada; Edge, Alastair +18 more
We present Space Telescope Imaging Spectrograph observations from the Hubble Space Telescope of the supermassive black hole (SMBH) at the center of PKS 0745-191, a brightest cluster galaxy (BCG) undergoing powerful radio-mode active galactic nucleus (AGN) feedback (Pcav ~ 5 × 1045 erg s‑1). These high-resolution da…
Detection and characterization of quasiperiodic oscillations in the Seyfert galaxy NGC 4151
Yongkang, Yan; Peng, Zhang; Zhou, Lu +6 more
This study aims to detect and characterize quasiperiodic oscillations (QPOs) signals in x-ray observations of NGC 4151. We employed the weighted wavelet Z-transform and Lomb-Scargle periodogram methods for our analysis. QPO signals with frequencies of
AstroSat UVIT Survey of M31: New Compact Source Catalog
Leahy, Denis; Ranasinghe, Sujith; Mitra, Saptadwipa +1 more
An ultraviolet survey of M31 was carried out during 2017–2023 with the UltraViolet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we present far- and near-ultraviolet (FUV and NUV) observations from the M31 UVIT survey, which covers a sky area of ≃3
AstroSat/UVIT Far- and Near-UV Deep Field Around IC 4329A
Dewangan, Gulab C.; Ganguly, Piyali; Rani, Priyanka
We present high-resolution near-ultraviolet (NUV) and far-ultraviolet (FUV) deep imaging of the field around the Seyfert galaxy IC 4329A based on five observations performed with the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat. The long exposures of 82.9 ks in the NUV (N245M; λmean = 2447 Å; Δλ = 270 Å) and 92.2 ks in the FUV…
Atmospheric Gravity Waves in Mars' Lower Atmosphere: Nadir Observations From OMEGA/Mars Express Data
Gilli, G.; Machado, P.; Wilson, C. +6 more
We present the detection and characterization of mesoscale waves on the lower clouds of Mars (20–40 km) using hyperspectral images from the Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité (OMEGA) onboard the European Mars Express space mission. We used image navigation and processing techniques based on contrast enhancement and g…
Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars
Paul, Biswajit; Laycock, Silas G. T.; Pradhan, Pragati +2 more
We report pulse-profile modeling of a sample of 23 X-ray binary pulsars observed with the Suzaku X-ray satellite. These pulsars have spin periods ranging from 0.7 to 9400 s, and their X-ray emission is powered by the accretion from their stellar companions. We fitted each individual pulse profile with the Polestar geometric model, which accounts f…
Geomorphological Observations and Physical Hypotheses About Martian Dune Gullies
Nardi, Adriano; Piersanti, Antonio
We propose the hypothesis that dune gullies and seasonal "meteorological" appearances observed on the same dunes (e.g., frosting) may have a common origin. These gullies are difficult to explain through the action of liquid flow. The occurrence of a spring flowing from the crest of a dune seems impossible to explain. However, these phenomena could…
Two almost planetary mass survivors of common envelope evolution
Dhillon, V. S.; Littlefair, S. P.; Hollands, M. A. +19 more
White dwarfs are often found in close binaries with stellar or even substellar companions. It is generally thought that these compact binaries form via common envelope evolution, triggered by the progenitor of the white dwarf expanding after it evolved off the main sequence and engulfing its companion. To date, a handful of white dwarfs in compact…
Magnetohydrodynamic Simulation of a Coronal Mass Ejection Observed during the Near-radial Alignment of Solar Orbiter and Earth
Pogorelov, Nikolai V.; Singh, Talwinder; Hegde, Dinesha V. +1 more
Interplanetary coronal mass ejections (ICMEs) are the primary sources of geomagnetic storms at Earth. The negative out-of-ecliptic component (Bz) of magnetic field in the ICME or its associated sheath region is necessary for it to be geoeffective. For this reason, magnetohydrodynamic simulations of CMEs containing data-constrained flux …