Search Publications
Noninteracting Black Hole Binaries with Gaia and LAMOST
Liu, Jifeng; Wiktorowicz, Grzegorz; Lu, Youjun +4 more
Until recently, black holes (BHs) could be discovered only through accretion from other stars in X-ray binaries, or in merging double compact objects. Improvements in astrometric and spectroscopic measurements have made it possible to detect BHs also in noninteracting BH binaries (nBHBs) through a precise analysis of the companion's motion. In thi…
Space Telescope and Optical Reverberation Mapping Project. XII. Broad-line Region Modeling of NGC 5548
Im, M.; Fox, O. D.; Malkan, M. A. +155 more
We present geometric and dynamical modeling of the broad line region (BLR) for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The data set includes photometric and spectroscopic monitoring in the optical and ultraviolet, covering the Hβ, C IV, and Lyα broad emission lines. We find an extended disk-like Hβ BLR with…
Automatic classification of plasma regions in near-Earth space with supervised machine learning: application to Magnetospheric Multi Scale 2016-2019 observation
Breuillard, Hugo; Lapenta, Giovanni; Dupuis, Romain +3 more
The proper classification of plasma regions in near-Earth space is crucial to perform unambiguous statistical studies of fundamental plasma processes such as shocks, magnetic reconnection, waves and turbulence, jets and their combinations. The majority of available studies have been performed by using human-driven methods, such as visual data sele…
HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame. I. The Most Energetic Outflows in the Universe and Other Discoveries
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
The Hubble Space Telescope/Cosmic Origins Spectrograph (COS) has opened a new discovery space for studying quasar absorption outflows and their contribution to active galactic nucleus (AGN) feedback. Specifically, COS provides high-quality far-ultraviolet (FUV) spectra covering the diagnostic-rich 500-1050 Å rest frame (hereafter, EUV500) of mediu…
The e-MERGE Survey (e-MERLIN Galaxy Evolution Survey): overview and survey description
Guidetti, D.; Bondi, M.; Prandoni, I. +37 more
We present an overview and description of the e-MERGE Survey (e-MERLIN Galaxy Evolution Survey) Data Release 1 (DR1), a large program of high-resolution 1.5-GHz radio observations of the GOODS-N field comprising ∼140 h of observations with enhanced-Multi-Element Remotely Linked Interferometer Network (e-MERLIN) and ∼40 h with the Very Large Array …
Reconnection- and Dipolarization-Driven Auroral Dawn Storms and Injections
Bonfond, B.; Vogt, M. F.; Mauk, B. H. +8 more
Jupiter displays many distinct auroral structures, among which auroral dawn storms and auroral injections are often observed contemporaneously. However, it is unclear if the contemporaneous nature of the observations is a coincidence or part of an underlying physical connection. We show six clear examples from a recent Hubble Space Telescope campa…
Short- and long-term near-infrared spectroscopic variability of eruptive protostars from VVV
Minniti, D.; Alonso-García, J.; Lucas, P. W. +7 more
Numerous eruptive variable young stellar objects (YSOs), mostly Class I systems, were recently detected by the near-infrared Vista Variables in the Via Lactea (VVV) survey. We present an exploratory near-infrared spectroscopic variability study of 14 eruptive YSOs. The variations were sampled over one-day and one-to-two-year intervals and analysed…
A combined timing/spectral study of IRAS 13224-3809 using XMM-Newton data
Papadakis, I. E.; Dovčiak, M.; Karas, V. +3 more
We present the results from an X-ray variability study of IRAS 13224-3809. This is probably the best source for X-ray reverberation studies since it is X-ray bright, extremely variable, and it has been extensively observed with XMM-Newton. We used all the archival XMM-Newton data from the three EPIC cameras (to increase the signal to noise) and, g…
Properties of five z ∼ 0.3-0.4 confirmed LyC leakers: VLT/XShooter observations
Schaerer, D.; Ramambason, L.; Izotov, Y. I. +7 more
Using new Very Large Telescope (VLT)/XShooter spectral observations we analyse the physical properties of five z ~ 0.3-0.4 confirmed Lyman continuum (LyC) leakers. Strong resonant Mg II λλ2796, 2803 Å emission lines (I(λλ2796, 2803)/I(Hβ) ≃ 10-38 per cent) and non-resonant Fe II* λλ2612, 2626 Å emission lines are observed in spectra of five and th…
COol Companions ON Ultrawide orbiTS (COCONUTS). I. A High-gravity T4 Benchmark around an Old White Dwarf and a Re-examination of the Surface-gravity Dependence of the L/T Transition
Magnier, Eugene A.; Hermes, J. J.; Marley, Mark S. +7 more
We present the first discovery from the COol Companions ON Ultrawide orbiTS (COCONUTS) program, a large-scale survey for wide-orbit planetary and substellar companions. We have discovered a comoving system COCONUTS-1, composed of a hydrogen-dominated white dwarf (PSO J058.9855+45.4184; d = 31.5 pc) and a T4 companion (PSO J058.9869+45.4296) at a 4…