Tootfinder

Forgotten treasures in the HST/FOC UV imaging polarimetric archives of active galactic nuclei -- IV. 5 Orphaned AGNs
Thibault Barnouin (Observatoire Astronomique de Strasbourg, Universit\'e de Strasbourg, France), Fr\'ed\'eric Marin (Observatoire Astronomique de Strasbourg, Universit\'e de Strasbourg, France), Enrique Lopez-Rodriguez (Department of Physics and Astronomy, University of South Carolina, USA, Kavli Institute for Particle Astrophysics and Cosmology, Stanford…

Forgotten treasures in the HST/FOC UV imaging polarimetric archives of active galactic nuclei -- IV. 5 Orphaned AGNs
The Faint Object Camera (FOC) onboard the Hubble Space Telescope (HST) acquired high-resolution, spatially resolved polarimetric images of nearby Active Galactic Nuclei (AGNs) in the near ultraviolet (near-UV) band. Among the 25 individual targets in the polarized archives, 8 had no published analysis until the beginning of this series of papers. We tackle the last 5 targets in the following. In this paper, we finalize the publication of near-UV imaging polarimetry of AGNs in the HST/FOC archiv…

Edge-On Disk Study (EODS) II: Thermal Structure of the Flying Saucer Disk
S. Guilloteau (Univ. Bordeaux, CNRS, Laboratoire d'Astrophysique de Bordeaux), O. Denis-Alpizar (Departamento de F\'isica, Facultad de Ciencias, Universidad de Chile, Av. Las Palmeras 3425, Nu\~noa, Santiago, Chile), A. Dutrey (Univ. Bordeaux, CNRS, Laboratoire d'Astrophysique de Bordeaux), C. Foucher (Univ. Bordeaux, CNRS, Laboratoire d'Astrophysique de Bordeaux), S. Gavino (Dipartimento di Fisic…

Edge-On Disk Study (EODS) II: Thermal Structure of the Flying Saucer Disk
Context. The dust and gas temperature in proto-planetary disks play critical roles in determining their chemical evolution and influencing planet formation processes. Aims. We attempted an accurate measurement of the dust and CO temperature profile in the edge-on disk of the Flying Saucer. Methods. We used the unique properties of the Flying Saucer, its edge-on geometry and its fortunate position in front of CO clouds with different brightness temperatures to provide independent constraints on …

This https://arxiv.org/abs/2410.07694 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe
We propose a unified framework that describes both the curvaton mechanism for generating primordial density fluctuations and the Affleck-Dine (AD) mechanism for baryogenesis. By introducing a complex scalar field (AD field) carrying a baryon/lepton number and its potential consisting of quadratic and quartic terms with a small baryon/lepton-number-violating mass term, we investigate the evolution of the scalar field during the radiation-dominated era following inflation. We set the initial cond…

Many people are detained at U.S. airports for reasons they find arbitrary and mysterious.
I got lucky—when I was stopped by Customs and Border Protection last week, after flying to Los Angeles from Melbourne, a border agent told me, explicitly and proudly, why I’d been pulled out of the customs line.
“Look, we both know why you are here,” the agent told me.
He identified himself to me as Adam, though his colleagues referred to him as Officer Martinez.
When I said that…

How My Reporting on the Columbia Protests Led to My Deportation
Alistair Kitchen on being detained at Los Angeles International Airport and sent back to Australia because of his reporting on the protests at Columbia University criticizing Israel’s actions in Gaza.

JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3
A. J. Levan, B. Schneider, E. Le Floc'h, G. Brammer, N. R. Tanvir, D. B. Malesani, A. Martin-Carrillo, A. Rossi, A. Saccardi, A. Sneppen, S. D. Vergani, J. An, J. -L. Atteia, F. E. Bauer, V. Buat, S. Campana, A. Chrimes, B. Cordier, L. Cotter, F. Daigne, V. D'Elia, M. De Pasquale, A. de Ugarte Postigo, G. Corcoran, R. A. J. Eyles-Ferris, H. Fausey, A. S. Fruchter, O. Godet, B. P. Gompertz, D. Gotz, N. Habeeb…

JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3
The majority of energetic long-duration gamma-ray bursts (GRBs) are thought to arise from the collapse of massive stars, making them powerful tracers of star formation across cosmic time. Evidence for this origin comes from the presence of supernovae in the aftermath of the GRB event, whose properties in turn link back to those of the collapsing star. In principle, with GRBs we can study the properties of individual stars in the distant universe. Here, we present JWST/NIRCAM observations that d…

Outflows from Star-Forming Galaxies in the Early Universe: Evolution from Double- to Single-Peaked Lyman-$ \alpha $ Profiles Following Delayed Supernova Feedback
James Nianias, Jeremy Lim, Yik Lok Wong, Gordon Wong
https://arxiv.org/abs/2506.20422

Outflows from Star-Forming Galaxies in the Early Universe: Evolution from Double- to Single-Peaked Lyman-$ α$ Profiles Following Delayed Supernova Feedback
Lyman-$ α$ emission, which owing to its resonant nature strongly couples the emergent line profile to gas kinematics, has become a key observable for probing outflows from star-forming galaxies in the early universe. Typically, Lyman-$ α$ profiles are explained in terms of idealised expanding shell models, while empirically-motivated interpretations of Lyman-$ α$ profiles that make use of comparisons with kinematics revealed by other spectral features (e.g. metal emission and absorption line…

The lesson for Australia in all of this is that, as with China, we need to treat the US not as an ally or friend but as a trading partner which will seek to push us around whenever possible. The correct response, again as with China, is to stand our ground until the other side sees the pointlessness of bullying and the mutual benefits of free exchange.
~ John Quiggin, professor at the University of Queensland’s school of economics
https://www.theguardian.com/commentisfree/2025/aug/01/sorry-america-but-its-not-australias-fault-that-your-healthcare-system-is-failing-you?CMP=Share_iOSApp_Other

Explaining the "too massive" high-redshift galaxies in JWST data: numerical study of three effects and a simple relation
Joshua J. Ziegler, Katherine Freese, Jonathan Lozano, Gabriele Montefalcone
https://arxiv.org/abs/2507.21409

Explaining the "too massive" high-redshift galaxies in JWST data: numerical study of three effects and a simple relation
The James Webb Space Telescope has discovered high luminosity galaxies that appear to be "too many" and "too massive" compared to predictions of the Standard LCDM cosmology, suggesting that star formation in the early universe is more rapid than previously anticipated. In this paper we examine in detail the following three effects which can instead provide alternative explanations for these observations: (1) a "top heavy" initial mass function (IMF) for the stars, (2) a variety of star formatio…

Extreme value distribution for GRB prompt data -- How unexpected was the BOAT event?
Stefano Covino
https://arxiv.org/abs/2507.14041 https://

Extreme value distribution for GRB prompt data -- How unexpected was the BOAT event?
Gamma-Ray Bursts (GRBs) are known to be unpredictable in time and position. A few (observationally) exceptional events have been observed, as GRB221009A that stands out for its fluence and peak flux, being orders of magnitude higher than what measured so far. Analyzing the observed fluence, peak flux or duration distributions typically requires one to assume some scenarios, and the consistency of the observed data with the predictions turns out to be an important model diagnostic. However, it i…