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The Large Array Survey Telescope-Pipeline. I. Basic Image Reduction and Visit Coaddition
Fallah Ramazani, V.; Ofek, E. O.; Ben-Ami, S. +18 more
The Large Array Survey Telescope (LAST) is a wide-field telescope designed to explore the variable and transient sky with a high cadence and to be a test-bed for cost-effective telescope design. A LAST node is composed of 48 (32 already deployed), 28 cm f/2.2 telescopes. A single telescope has a 7.4 deg2 field of view and reaches a 5σ l…
Progenitors and explosion properties of supernova remnants hosting central compact objects: II. A global systematic study with a comparison to nucleosynthesis models
Fryer, C. L.; Safi-Harb, S.; Braun, C. +1 more
Core-collapse explosions of massive stars leave behind neutron stars, with a known diversity that includes the 'Central Compact Objects' (CCOs). Typified by the neutron star discovered near the centre of the Cas A supernova remnant (SNR), CCOs have been observed to shine only in X-rays. To address their supernova progenitors, we perform a systemat…
The Impact of Multifluid Effects in the Solar Chromosphere on the Ponderomotive Force under SE and NEQ Ionization Conditions
Testa, Paola; Martínez-Sykora, Juan; De Pontieu, Bart +3 more
The ponderomotive force has been suggested to be the main mechanism to produce the so-called first ionization potential (FIP) effect-the enrichment of low-FIP elements observed in the outer solar atmosphere, in the solar wind, and in solar energetic events. It is well known that the ionization of these elements occurs within the chromosphere. Ther…
A closer look at the binary content of NGC 1850
Dreizler, S.; Usher, C.; Bastian, N. +7 more
Studies of young clusters have shown that a large fraction of O-/early B-type stars are in binary systems, where the binary fraction increases with mass. These massive stars are present in clusters of a few Myr, but gradually disappear for older clusters. The lack of detailed studies of intermediate-age clusters has meant that almost no informatio…
Infall and outflow towards high-mass starless clump candidates
Leurini, S.; Traficante, A.; Wyrowski, F. +6 more
The evolutionary sequence for high-mass star formation starts with massive starless clumps that go on to form protostellar, young stellar objects and then compact H II regions. While there are many examples of the three later stages, the very early stages have proved to be elusive. We follow-up a sample of 110 mid-infrared dark clumps selected fro…
Period-Luminosity Relations for Galactic Classical Cepheids in the Sloan Bands
Gieren, Wolfgang; Pietrzyński, Grzegorz; Graczyk, Dariusz +6 more
We present the first period-luminosity (PL) and period-Wesenheit (PW) relations in the Sloan-Pan-STARRS g P1 r P1 i P1 bands for classical fundamental-mode Cepheids in the Milky Way. We used a relatively modest number of 76 stars for the PL and 84-85 stars for the PW relations calibration. The data for the proje…
White Dwarfs Revealed in Gaia's Candidate Compact Object Binaries
Chatterjee, Sourav; Nayak, Prasanta K.; Ganguly, Anindya
Discovery and characterization of black holes (BHs), neutron stars (NSs), and white dwarfs (WDs) with detached luminous companions (LCs) in wide orbits are exciting because they are important test beds for dark remnant (DR) formation physics as well as binary stellar evolution models. Recently, 187 candidates have been identified from Gaia's non-s…
Milky Way globular clusters on cosmological timescales. II. Interaction with the Galactic centre
Berczik, Peter; Ishchenko, Maryna; Sobolenko, Margaryta +2 more
Aims: We estimate the dynamical evolution of the interaction of globular clusters' with the Galactic centre that dynamically changed in the past.
Methods: We simulated the orbits of 147 globular clusters over a 10 Gyr lookback time using the parallel N-body code `φ-GPU'. For each globular cluster, we generated 1000 sets of initial data w…
Unveiling the accretion scenario of BH-ULXs using XMM-Newton observations
Agrawal, Vivek K.; Nandi, Anuj; Das, Santabrata +1 more
We present a comprehensive spectrotemporal analysis of five ultraluminous X-ray sources (ULXs) with central object likely being a black hole, using archival XMM-Newton observations. These sources, namely NGC1313 X-1, NGC5408 X-1, NGC6946 X-1, M82 X-1, and IC342 X-1, reveal short-term variability with fractional variance of 1.42$-27.28~{{\ \rm per\…
Constraining the LyC escape fraction from LEGUS star clusters with SIGNALS H II region observations: a pilot study of NGC 628
Della Bruna, Lorenza; Grebel, Eva K.; Rousseau-Nepton, Laurie +23 more
The ionizing radiation of young and massive stars is a crucial form of stellar feedback. Most ionizing (Lyman-continuum; LyC, λ < 912Å) photons are absorbed close to the stars that produce them, forming compact H II regions, but some escape into the wider galaxy. Quantifying the fraction of LyC photons that escape is an open problem. In this wo…