Big Datasets are becoming more and more prominent in the field of astrophysics with new powerful telescopes and surveys capturing parts of our night sky in an...
Untangling Sunspot Penumbrae: New Stokes Profile Analyses
We present preliminary analyses of Stokes [I, Q, U, V] spectra of a sunspot penumbra using two different analysis/inversion procedures. It has long been known...
Unusual Morphologies from the HST Snapshot Survey of BL Lac Objects: Three Optical Jets and A Possible Einstein Ring
The HST snapshot survey of 108 BL Lac objects has revealed several instances of unusual morphologies, three jets and a possible Einstein ring. Of the three...
Unusual optical and X-ray flaring activity in GX 339-4
Since September 2007 we have been monitoring the optical counterpart (V, R and i-bands) of the black hole X-ray binary GX 339-4 with the Faulkes Telescope South...
Unveiling Chiron, an odd ice ball, with Webb: Ice and Gas Phases Revealed
We present unprecedented findings on (2060) Chiron using James Webb Space Telescope (JWST) NIRSpec imaging and spectroscopy from cycle 1 GTO program 1273. Our...
Unveiling galaxy protoclusters in the era of Euclid
How large-scale structures formed in the early universe is a key cosmological question with few answers from empirical evidence. Unveiling galaxy clusters and...
X-ray transients provide the best evidence for the existence of stellar-mass BHs, with 20 confirmed cases based on dynamical studies. However, these are only...
Soft X-ray transients (SXTs) provide the best evidence for the existence of stellar-mass black holes (BHs) with almost 20 confirmed systems based on dynamical...