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Study of morphology and degradation of lunar craters using Chandrayaan-1 data
Srivastava, Pradeep; Jain, Vikrant; Khanna, Nitin +2 more
Impact craters are essential and dominant features of the lunar surface. Under the presence of a very thin atmosphere, the degradation of the lunar craters takes place possibly due to gravity, slope processes, or solar wind weathering. Hence, these craters act as tools to understand the properties and processes of the lunar surface. Our analysis i…
Interior properties of the inner Saturnian moons from space astrometry data
Lainey, V.; Noyelles, B.; Rambaux, N. +3 more
During the thirteen years in orbit around Saturn before its final plunge, the Cassini spacecraft provided more than ten thousand astrometric measurements. Such large amounts of accurate data enable the search for extremely faint signals in the orbitalmotion of the saturnian moons. Among these, the detection of the dynamical feedback of the rotatio…
A new study towards PSR J1826-1334 and PSR J1826-1256 in the region of HESS J1825-137 and HESS J1826-130
Giacani, E.; Duvidovich, L.; Castelletti, G. +2 more
Aims: The goal of this paper is to detect synchrotron emission from the relic electrons of the crushed pulsar wind nebula (PWN) HESS J1825-137 and to investigate the origin of the γ-ray emission from HESS J1826-130.
Methods: The study of HESS J1825-137 was carried out on the basis of new radio observations centred at the position of PSR …
Exceptional Extended Field-of-view Observations by PROBA2/SWAP on 2017 April 1 and 3
West, Matthew J.; Mierla, Marilena; D'Huys, Elke +2 more
On 2017 April 1 and 3, two large eruptions on the western solar limb, which were associated with M4.4- and M5.8-class flares, respectively, were observed with the Sun Watcher with Active Pixels and Image Processing (SWAP) Extreme Ultraviolet (EUV) solar telescope on board the Project for On Board Autonomy 2 (PROBA2) spacecraft. The large field-of-…
Broadband X-Ray Spectral and Timing Analyses of the Black Hole Binary Candidate Swift J1658.2-4242: Rapid Flux Variation and the Turn-on of a Transient QPO
Gandhi, Poshak; Walton, Dominic J.; Miller, Jon M. +6 more
We report results from joint Nuclear Spectroscopic Telescope Array, Swift, and XMM-Newton observations of the newly discovered black hole X-ray binary candidate Swift J1658.2-4242 in the intermediate state. We observe a peculiar event in this source, with its X-ray flux rapidly decreasing by ∼45% in ∼40 s, accompanied by only subtle changes in the…
Forming One of the Most Massive Objects in the Universe: The Quadruple Merger in Abell 1758
O'Sullivan, E.; David, L.; Schellenberger, G. +2 more
The system A1758 is made up of two galaxy clusters, a more massive, northern cluster and a southern cluster. Both parts are undergoing major merger events at different stages. Although the mass of the merger constituents provides enough energy to produce visible shock fronts in the X-ray, none have been found to date. We present detailed temperatu…
Developing the Physical Understanding of Intermediate Polars: An X-Ray Study of TV Col and V2731 Oph
Mukai, K.; Lopes de Oliveira, R.
The X-rays in intermediate polars (IPs) originate in a compact region near the surface of a magnetic white dwarf (WD) and interact with the complex environment surrounding the emission region. Here we report a case study of two IPs, TV Col and V2731 Oph, with selected archival X-ray observations (NuSTAR, Swift, Suzaku, and XMM-Newton). For TV Col,…
Long-term soft and hard X-ray investigation of the colliding wind WN+O binary WR 25
Pandey, J. C.; De Becker, M.; Arora, Bharti
We investigated the long-term behaviour in X-rays of the colliding wind binary WR 25, using archival data obtained with Suzaku, Swift, XMM-Newton, and NuSTAR spanning over ∼16 yr. Our analysis reveals phase-locked variations repeating consistently over many consecutive orbits, in agreement with an X-ray emission fully explained by thermal emission…
An insight into the extragalactic transient and variable microJy radio sky across multiple decades
Thomson, A. P.; Garrett, Michael A.; Radcliffe, Jack F. +3 more
The mJy variable extragalactic radio sky is known to be broadly non-changing with approximately 3{{ per cent}} of persistent radio sources exhibiting variability that is largely active galactic nucleus-related (AGN). In the faint (<mJy) flux density regime, it is widely accepted that the radio source population begins to change from AGN dominat…
Bolometric corrections of stellar oscillation amplitudes as observed by the Kepler, CoRoT, and TESS missions
Lund, Mikkel N.
A better understanding of the amplitudes of stellar oscillation modes and surface granulation is essential for improving theories of mode physics and the properties of the outer convection zone of solar-like stars. A proper prediction of these amplitudes is also essential for appraising the detectability of solar-like oscillations for asteroseismi…