An accurate determination of photospheric solar abundances requires detailed modeling of the solar granulation and accounting for departures from local...
A recurrent nova super-remnant in the Andromeda galaxy
The accretion of hydrogen onto a white dwarf star ignites a classical nova eruption1,2—a thermonuclear runaway in the accumulated envelope of gas, leading to...
A Reemerging Bright Soft X-Ray State of the Changing-look Active Galactic Nucleus 1ES 1927+654: A Multiwavelength View
1ES1927+654 is a nearby active galactic nucleus (AGN) that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability...
A refined analysis of the low-mass eclipsing binary system T-Cyg1-12664
Context. The observational mass-radius relation of main sequence stars with masses between 0.3 and 1.0 M⊙ reveals deviations between the stellar radii predicted...
A refined dynamical mass for the black hole in the X-ray transient XTE J1859+226
We present two contiguous nights of simultaneous time-resolved Gran Telescopio Canarias spectroscopy and William Herschel Telescope photometry of the black hole...
A refined sub-grid model for black hole accretion and AGN feedback in large cosmological simulations
In large-scale cosmological hydrodynamic simulations simplified sub-grid models for gas accretion on to black holes and AGN feedback are commonly used. Such...
A regularization term to avoid the saturation of the sigmoids in multilayer neural networks
In this paper we propose a new method to prevent the saturation of any set of hidden units of a multilayer neural network. This method is implemented by adding...
A remarkable feature in the giant extragalactic H II region NGC 5471
The discovery of a very high velocity, low-intensity gas feature in the giant extragalactic H II region NGC 5471 is reported. A broad component in the emission...
A remarkable recurrent nova in M31: Discovery and optical/UV observations of the predicted 2014 eruption
The Andromeda Galaxy recurrent nova M31N 2008-12a had been caught in eruption eight times. The inter-eruption period of M31N 2008-12a is ~1 yr, making it the...