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Political turmoil in Washington has dried up job opportunities in what Professor Ladher calls
“the best research ecosystem in the world.”
Some decided they would now rather take their skills elsewhere, including Austria, Japan and Australia,
while others opted to stay in India.
As the Trump administration moves with abandon to deny visas,
expel foreign students and slash spending on research,
scientists in the United States are becoming increasingly alarm…

World Scientists Look Elsewhere as U.S. Labs Stagger Under Trump Cuts
With the welcome mat withdrawn for promising researchers from around the world, America is at risk of losing its longstanding pre-eminence in the sciences.

This https://arxiv.org/abs/2409.10631 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Spatially Resolved Kinematics of SLACS Lens Galaxies. I: Data and Kinematic Classification
We obtain spatially resolved kinematics with the Keck Cosmic Web Imager (KCWI) integral-field spectrograph for a sample of 14 massive (11 < log$_{10}$ M$_*$/M$_{\odot}$ < 12) lensing early-type galaxies at z~0.15-0.35 from the Sloan Lens ACS (SLACS) Survey. We integrate kinematic maps within the effective radius and examine rotational and dispersion velocities, showing that 11/14 are slow rotators. The dataset is unprecedented for galaxy-scale strong lenses in terms of signal-to-noise ratio (S/…

Intermittency in Interplanetary Coronal Mass Ejections Observed by Parker Solar Probe and Solar Orbiter
Julia Ruohotie, Simon Good, Christian M\"ostl, Emilia Kilpua
https://arxiv.org/abs/2505.22283

Intermittency in Interplanetary Coronal Mass Ejections Observed by Parker Solar Probe and Solar Orbiter
Intermittency has been studied extensively in the fast and slow solar winds but to a far lesser extent in interplanetary coronal mass ejections (ICMEs). While ICMEs are often characterized by their relatively smooth, large-scale magnetic flux rope structures, a spectrum of fluctuations is nonetheless present at smaller scales. We have examined kurtosis and its scaling exponents at magnetohydrodynamic inertial scales in 49 ICMEs observed between 0.25 and 1 au by Parker Solar Probe and Solar Orbi…

The ambiguous AT2022rze: Changing-look AGN mimicking a supernova in a merging galaxy system
P. J. Pessi, R. Lunnan, J. Sollerman, L. Yan, A. Le Reste, Y. Yao, S. Nordblom, Y. Sharma, M. Gilfanov, R. Sunyaev, S. Schulze, J. Johansson, A. Gangopadhyay, K. Tristram, M. Hayes, C. Fransson, Y. Hu, S. J. Brennan, S. Rose, K. De, P. Charalampopoulos, A. Gkini, M. J. Graham, C. P. Guti\'errez, S. Mattila, T. Nagao, I. P\'erez-Fournon, F. Poidevin, J. S. Bloom, J. Brugger, T. X. Chen, M…

The ambiguous AT2022rze: Changing-look AGN mimicking a supernova in a merging galaxy system
AT2022rze is a luminous, ambiguous transient located South-East of the geometric center of its host galaxy at redshift z = 0.08. The host appears to be formed by a merging galaxy system. The observed characteristics of AT2022rze are reminiscent of active galactic nuclei (AGN), tidal disruption events (TDEs), and superluminous supernovae (SLSNe). The transient reached a peak absolute magnitude of -20.2 +- 0.2 mag, showing a sharp rise (trise,1/e = 27.5 +- 0.6 days) followed by a slow decline (td…

Stellar Mass Segregation in Dark Matter Halos
Rapha\"el Errani, Jorge Pe\~narrubia, Matthew G. Walker
https://arxiv.org/abs/2505.22717 https://…

Stellar Mass Segregation in Dark Matter Halos
We study the effect of stellar mass segregation driven by collisional relaxation within the potential well of a smooth dark matter halo. This effect is of particular relevance for old stellar systems with short crossing times, where small collisional perturbations accumulate over many dynamical time scales. We run collisional $N$-body simulations tailored to the ambiguous stellar systems Ursa Major 3/Unions 1, Delve 1 and Eridanus 3, modelling their stellar populations as two-component systems …