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Truth or Delusion? A Possible Gravitational Lensing Interpretation of the Ultraluminous Quasar SDSS J010013.02+280225.8 at z = 6.30
Ouchi, Masami; Fujimoto, Seiji; Oguri, Masamune +2 more
Gravitational lensing sometimes dominates the observed properties of apparently very bright objects. We present morphological properties in the high-resolution (FWHM ∼ 0"15) Atacama Large Millimeter/submillimeter Array (ALMA) 1 mm map for an ultraluminous quasar at z = 6.30, SDSS J010013.02+280225.8 (hereafter J0100+2802), whose black hole (BH) ma…
Longitudinal filament oscillations enhanced by two C-class flares
Guo, J. H.; Zhang, Q. M.; Xu, A. A. +1 more
Context. Large-amplitude, longitudinal filament oscillations triggered by solar flares have been well established in the literature. However, filament oscillations enhanced by flares have never been reported.
Aims: In this paper we report the multiwavelength observations of a very long filament in active region (AR) 11112 on 2010 October 18. …
FOXSI-2 Solar Microflares. I. Multi-instrument Differential Emission Measure Analysis and Thermal Energies
Krucker, Säm; Narukage, Noriyuki; Musset, Sophie +8 more
In this paper we present the differential emission measures (DEMs) of two sub-A class microflares observed in hard X-rays (HXRs) by the FOXSI-2 sounding rocket experiment, on 2014 December 11. The second Focusing Optics X-ray Solar Imager (FOXSI) flight was coordinated with instruments X-ray Telescope (Hinode/XRT) and Solar Dynamics Observatory/At…
Ultra-luminous quasars at redshift z > 4.5 from SkyMapper
Wolf, Christian; Schmidt, Brian P.; Bian, Fuyan +6 more
The most luminous quasars at high-redshift harbour the fastest growing and most massive black holes in the early Universe. They are exceedingly rare and hard to find. Here, we present our search for the most luminous quasars in the redshift range from z = 4.5 to 5 using data from SkyMapper, Gaia, and WISE. We use colours to select likely high-reds…
Reconnection from a turbulence perspective
Eastwood, J. P.; Matthaeus, W. H.; Stawarz, J. E. +6 more
The spectral properties associated with laminar, anti-parallel reconnection are examined using a 2.5D kinetic particle in cell simulation. Both the reconnection rate and the energy spectrum exhibit three distinct phases: an initiation phase where the reconnection rate grows, a quasi-steady phase, and a declining phase where both the reconnection r…
Discovery of molecular gas fueling galaxy growth in a protocluster at z = 1.7
Prandoni, I.; Massardi, M.; Vignali, C. +16 more
Based on ALMA Band 3 observations of the CO(2→1) line transition, we report the discovery of three new gas-rich (MH2 ∼ 1.5 - 4.8 × 1010 M⊙) galaxies in an overdense region at z = 1.7 that already contains eight spectroscopically confirmed members. This leads to a total of 11 confirmed overdensity members…
Chemical diversity among A-B stars with low rotational velocities: non-LTE abundance analysis
Ryabchikova, T.; Sitnova, T.; Mashonkina, L. +2 more
We present accurate element abundance patterns based on the non-local thermodynamic equilibrium (non-LTE, NLTE) line formation for 14 chemical elements from He to Nd for a sample of nine A9 to B3-type stars with well-determined atmospheric parameters and low rotational velocities. We constructed new model atom of Zr II-III and updated model atoms …
Optical counterpart to Swift J0243.6+6124
Reig, P.; Alfonso-Garzón, J.; Fabregat, J.
Context. Swift J0243.6+6124 is a unique system. It is the first and only ultra-luminous X-ray source in our Galaxy. It is the first and only high-mass Be X-ray pulsar showing radio jet emission. It was discovered during a giant X-ray outburst in October 2017. While there are numerous studies in the X-ray band, very little is known about the optica…
The Outburst of the Young Star Gaia19bey
Lin, Chien-Cheng; Tonry, John; Magnier, Eugene +10 more
We report photometry and spectroscopy of the outburst of the young stellar object Gaia19bey. We have established the outburst light curve with archival Gaia "G," ATLAS "Orange," Zwicky Transient Facility r-band, and Pan-STARRS "rizy"-filter photometry, showing an outburst of ~4 yr duration, longer than typical EX Lupi objects but shorter than FU O…
Characterizing low-contrast Galactic open clusters with Gaia Data Release 2
Corradi, W. J. B.; Santos, J. F. C.; Angelo, M. S.
In this study, we characterized 16 objects previously classified as faint or low-contrast Galactic open clusters (OCs). We employed parameters associated with the dynamical evolution of the OCs: the core (rc), tidal (rt) and half-mass (rhm) radii, age and crossing time (tcr). Relations among these parame…