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Stellar streams around the Magellanic Clouds in 4D
Belokurov, V.; Koposov, S. E.; Catelan, M. +7 more
We carried out a spectroscopic follow-up programme of the four new stellar stream candidates detected by Belokurov & Koposov in the outskirts of the Large Magellanic Cloud (LMC) using FORS2 (VLT). The medium-resolution spectra were used to measure the line-of-sight velocities, estimate stellar metallicities, and classify stars into Blue Horizo…
ALMA Reveals a Gas-rich, Maximum Starburst in the Hyperluminous, Dust-obscured Quasar W0533-3401 at z ∼ 2.9
Knudsen, Kirsten K.; Fan, Lulu; Han, Yunkun +1 more
We present ALMA observations and multiwavelength spectral energy distribution analysis in a Wide-field Infrared Survey Explorer-selected, hyperluminous dust-obscured quasar W0533-3401 at z = 2.9. We derive the physical properties of each of its components, such as molecular gas, stars, dust, and the central supermassive black hole (SMBH). Both the…
Multiple Magnetic Reconnections Driven by a Large-scale Magnetic Flux Rope
Wang, J. X.; Tan, B. L.; Zhou, G. P. +4 more
Magnetic flux ropes (MFRs), as the most probable core structure of solar eruptive activity, remain mysterious on their origination, magnetic environment, and erupting mechanisms. Here, we newly identify a large-scale hot channel MFR, named “MFR3”, that connects an anti-Hale active region (AR) 11429 and a normal AR 11430 on 2012 March 7 based on mu…
Probing the Innermost Ejecta Layers in Supernova Remnant Kes 75: Implications for the Supernova Progenitor
Gelfand, Joseph D.; Temim, Tea; Koo, Bon-Chul +3 more
Supernova remnants (SNRs) that contain pulsar wind nebulae (PWNe) are characterized by distinct evolutionary stages. In very young systems, the PWN drives a shock into the innermost supernova (SN) material, giving rise to low-excitation lines and an infrared (IR) continuum from heated dust grains. These observational signatures make it possible to…
Complex molecular gas kinematics in the inner 5 kpc of 4C12.50 as seen by ALMA
Combes, F.; Salomé, P.; Dasyra, K. M. +2 more
The nearby system 4C12.50, also known as IRAS 13451+1217 and PKS 1345+12, is a merger of gas-rich galaxies with infrared and radio activity. It has a perturbed interstellar medium (ISM) and a dense configuration of gas and dust around the nucleus. The radio emission at small (∼100 pc) and large (∼100 kpc) scales, as well as the large X-ray cavity …
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…