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The Milky Way could have many more satellite galaxies than scientists have previously been able to predict or observe,
according to new research.
Cosmologists at Durham University used a new technique combining the highest-resolution supercomputer simulations that exist,
alongside novel mathematical modeling, to predict the existence of missing "orphan" galaxies.

The Milky Way could be teeming with more satellite galaxies than previously thought
The Milky Way could have many more satellite galaxies than scientists have previously been able to predict or observe, according to new research. Cosmologists at Durham University used a new technique combining the highest-resolution supercomputer simulations that exist, alongside novel mathematical modeling, to predict the existence of missing "orphan" galaxies.

What drives the growth of black holes: a decade of progress
D. M. Alexander (CEA-Durham), R. C. Hickox (Dartmouth College), J. Aird (Edinburgh), F. Combes (Obs de Paris), T. Costa (Newcastle), M. Habouzit (Geneva), C. M. Harrison (Newcastle), R. I. Leng (Edinburgh), L. K. Morabito (CEA-Durham), S. L. Uckelman (Durham), P. Vickers (Durham)
https://

What drives the growth of black holes: a decade of progress
The last decade has witnessed significant progress in our understanding of the growth of super-massive black holes (SMBHs). It is now clear that an Active Galactic Nucleus (AGN: the observed manifestation of a growing SMBH) is an "event" within the broader lifecycle of a galaxy, which can significantly influence the shape and evolution of the galaxy itself. Our view of the obscuring medium that affects the observed properties of an AGN has also undergone a revolution, and we now have a more phy…

Heat Transport and Dissipation in 2.5D Rotating Internally Heated and Cooled Convection
Tom Joshi-Hartley (University of Exeter), Matthew K. Browning (University of Exeter), Laura K. Currie (Durham University), Neil T. Lewis (University of Exeter), Benjamin P. Brown (University of Colorado at Boulder), Simon R. W. Lance (University of Exeter)
https:/…

Heat Transport and Dissipation in 2.5D Rotating Internally Heated and Cooled Convection
Models of astrophysical convection, such as mixing length theory, typically assume that the heat transport is independent of microphysical diffusivities. Such 'diffusion-free' behaviour is, however, not observed in numerical simulations employing standard fixed-flux or fixed-temperature boundary conditions, except possibly in extreme parameter regimes that are computationally expensive to achieve. Recent numerical and experimental work has suggested that internally heated and cooled convection …

XRISM Spectroscopy of the Stellar-Mass Black Hole 4U 1630-472 in Outburst
Jon M. Miller (Univ. of Michigan), Misaki Mizumoto (Univ. of Teacher Education Fukuoka), Megumi Shidatsu (Ehime University), Ralf Ballhausen (Univ. of Maryland, College Park, NASA/GSFC, CRESST), Ehud Behar (Technion), Maria Diaz Trigo (ESO), Chris Done (Univ. of Durham), Tadayasu Dotani (ISAS), Javier Garcia (Caltech), Timothy Kallman (NASA/GSFC), Shogo B. Kobayashi (Tokyo Univ. of Science), Aya Kubota (Shibaura …

XRISM Spectroscopy of the Stellar-Mass Black Hole 4U 1630-472 in Outburst
We report on XRISM/Resolve spectroscopy of the recurrent transient and well-known black hole candidate 4U 1630$-$472 during its 2024 outburst. The source was captured at the end of a disk-dominated high/soft state, at an Eddington fraction of $λ_\mathrm{Edd} \sim 0.05~(10 M_{\odot}/M_\mathrm{BH})$. A variable absorption spectrum with unprecedented complexity is revealed with the Resolve calorimeter. This marks one of the lowest Eddington fractions at which highly ionized absorption has been de…

Bottom Spectrum Estimate Under Curvature Integrability Condition
Cole Durham
https://arxiv.org/abs/2506.23997 https://arxiv.org/pdf/2…

Bottom Spectrum Estimate Under Curvature Integrability Condition
In this paper we prove an upper bound for the bottom of the spectrum of the Laplacian on manifolds with Ricci curvature bounded in integral sense. Our arguments rely on the existence of a minimal positive Green's function and its properties.

Scatter in the star formation rate-halo mass relation: secondary bias and its impact on line-intensity mapping
Rui Lan Jun (UTokyo), Tom Theuns (ICC, Durham), Kana Moriwaki (UTokyo), Sownak Bose (ICC, Durham)
https://arxiv.org/abs/2506.03015

Scatter in the star formation rate-halo mass relation: secondary bias and its impact on line-intensity mapping
We use the IllustrisTNG cosmological hydrodynamical simulations to study the impact of secondary bias -- specifically, the correlation between star formation rate (SFR) and halo bias at fixed halo mass -- on the line-intensity mapping (LIM) power spectrum. In LIM, the galaxy contributions are flux-weighted, and for many emission lines (e.g., H$α$), flux scales with SFR. We show that the (ensemble-averaged) large-scale two-halo term of the power spectrum depends only on the mean luminosity-halo…