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The Northern Extragalactic WISE × Pan-STARRS (NEWS) catalogue. Machine-learning identification of 40 million extragalactic objects
Khramtsov, Vladislav; Akhmetov, Volodymyr; Fedorov, Peter
This study involves two photometric catalogues, AllWISE and Pan-STARRS Data Release 1, which were cross-matched to identify extragalactic objects among the common sources of these catalogues. To separate galaxies and quasars from stars, we created a machine-learning model that is trained on photometric (in fact, colour-based) information from the …
The Grism Lens-Amplified Survey from Space (GLASS) - XIII. G800L optical spectra from the parallel fields
Vulcani, B.; Treu, T.; Brammer, G. B. +5 more
We present a catalogue of 22 755 objects with slitless, optical, Hubble Space Telescope (HST) spectroscopy from the Grism Lens-Amplified Survey from Space (GLASS). The data cover ∼220 sq. arcmin to 7-orbit (∼10 ks) depth in 20 parallel pointings of the Advanced Camera for Survey's G800L grism. The fields are located 6 arcmin away from 10 massive g…
Correction to: Studying the Composition and Mineralogy of the Hermean Surface with the Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) for the BepiColombo Mission: An Update
Hiesinger, H.; Maturilli, A.; Helbert, J. +10 more
A Correction to this paper has been published: https://doi.org/10.1007/s11214-020-00780-w
On the Energetics of a Possible Relativistic Jet Associated with the Binary Neutron Star Merger Candidate S190425z
Mohan, S.; Saleem, M.; Resmi, L. +1 more
Advanced LIGO and Virgo (AdvLIGO/VIRGO) detectors reported the first binary neutron star merger candidate in the third observing run, S190425z, on 2019 April 25. A weak γ-ray excess was reported nearly coincidentally by the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) satellite, which accidentally covered the entire localization regi…
Prospects for the In Situ detection of Comet C/2019 Y4 ATLAS by Solar Orbiter
Afghan, Qasim; Jones, Geraint H.; Price, Oliver
The European Space Agency's Solar Orbiter spacecraft will pass approximately downstream of the position of comet C/2019 Y4 (ATLAS) in late May and early June 2020. We predict that the spacecraft may encounter the comet's ion tail around 2020 May 31—June 1, and that the comet's dust tail may be crossed on 2020 June 6. We outline the solar wind feat…
Observation of the Large-Amplitude and Fast-Damped Plasma Sheet Flapping Triggered by Reconnection-Induced Ballooning Instability
Escoubet, C. P.; Dandouras, I.; Wang, C. +5 more
In this study, we reported the large-amplitude and fast-damped flapping of the plasma sheet, which co-occurred with magnetic reconnection. Data from the Double Star TC-1 and Cluster satellites were used to analyze the features of the plasma sheet flapping 1.4 RE earthward of an ongoing magnetic reconnection event. The flapping was rapid…
Modeling spurious forces on the LISA spacecraft across a full solar cycle
Frank, Barrett M.; Piotrzkowski, Brandon; Bolen, Brett +2 more
One source of noise for the laser interferometer space antenna (LISA) will be time-varying changes of the space environment in the form of solar wind particles and photon pressure from fluctuating solar irradiance. The approximate magnitude of these effects can be estimated from the average properties of the solar wind and the solar irradiance. We…
Observing the Earliest Stages of Star Formation in Galaxies: 8 µm Cores in Three Edge-on Disks
Elmegreen, Bruce G.; Elmegreen, Debra Meloy
To study the vertical distribution of the earliest stages of star formation in galaxies, three edge-on spirals, NGC 891, NGC 3628, and IC 5052, observed by the Spitzer Space Telescope InfraRed Array Camera (IRAC) were examined for compact 8 µm cores using an unsharp mask technique; 173, 267, and 60 cores were distinguished, respectively. Col…
The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period
Barry, T.; Snodgrass, C.; Jehin, E. +24 more
We report six stellar occultations by Phoebe (Saturn IX), an irregular satellite of Saturn, obtained between mid-2017 and mid-2019. The 2017 July 6 event was the first stellar occultation by an irregular satellite ever observed. The occultation chords were compared to a 3D shape model of the satellite obtained from Cassini observations. The rotati…
Cluster membership for the long-period Cepheid calibrator SV Vul
Negueruela, I.; Dorda, R.; Marco, A.
Classical Cepheids represent the first step of the distance scale ladder. Claims of tension between the locally calculated Hubble constant and the values deduced from Planck's results have sparked new interest in these distance calibrators. Cluster membership provides an independent distance measurement, as well as astrophysical context for studie…