The Cocytos Stream: A Disrupted Globular Cluster from our Last Major Merger?

Kavli Affiliate: Risa H. Wechsler | First 5 Authors: Christian Aganze, Vedant Chandra, Risa H. Wechsler, Ting S. Li, Sergey E. Koposov | Summary: The census of stellar streams and dwarf galaxies in the Milky Way provides direct constraints on galaxy formation models and the nature of dark matter. The DESI Milky Way survey (with […]


Continue.. The Cocytos Stream: A Disrupted Globular Cluster from our Last Major Merger?

Damping Wing-Like Features in the Spectra of High Redshift Quasars: a Challenge for Fully-Coupled Simulations

Kavli Affiliate: Nickolay Y. Gnedin | First 5 Authors: Nickolay Y. Gnedin, Hanjue Zhu, , , | Summary: Recently, several observational detections of damping-wing-like features at the edges of “dark gaps" in the spectra of distant quasars (the “Malloy-Lidz effect") have been reported, rendering strong support for the existence of “neutral islands" in the universe […]


Continue.. Damping Wing-Like Features in the Spectra of High Redshift Quasars: a Challenge for Fully-Coupled Simulations

Cross terms and monochromatic gravitational wave sources in our Galactic Centre

Kavli Affiliate: Pau Amaro Seoane | First 5 Authors: Pau Amaro Seoane, Josep V. Arnau, Màrius Josep Fullana i Alfonso, , | Summary: The gravitational capture of a small compact object by a supermassive black hole is one of the most intriguing sources of gravitational waves to be detected by space-borne observatories. Modeling gravitational waves […]


Continue.. Cross terms and monochromatic gravitational wave sources in our Galactic Centre

Massive Black Hole Seed Formation in Strong X-ray Environments at High Redshift

Kavli Affiliate: Kohei Inayoshi | First 5 Authors: Kazutaka Kimura, Kohei Inayoshi, Kazuyuki Omukai, , | Summary: Direct collapse of pristine gas in early galaxies is a promissing pathway for forming supermassive black holes (BHs) powering active galactic nuclei (AGNs) at the epoch of reionization (EoR). This seeding mechanism requires suppression of molecular hydrogen (H$_2$) […]


Continue.. Massive Black Hole Seed Formation in Strong X-ray Environments at High Redshift

Do We Know How to Model Reionization?

Kavli Affiliate: Nickolay Y. Gnedin | First 5 Authors: Nickolay Y. Gnedin, , , , | Summary: I compare the power spectra of the radiation fields from two recent sets of fully-coupled simulations that model cosmic reionization: "Cosmic Reionization On Computers" (CROC) and "Thesan". While both simulations have similar power spectra of the radiation sources, […]


Continue.. Do We Know How to Model Reionization?

Cosmogenic Neutrino Point Source and KM3-230213A

Kavli Affiliate: Zhuo Li | First 5 Authors: Qinyuan Zhang, Tian-Qi Huang, Zhuo Li, , | Summary: Cosmogenic neutrinos (CNs) are produced by ultra-high energy cosmic rays (UHECRs) interacting with cosmic background radiation. We investigated the properties of CN point/extended sources, i.e, the neutrino spectrum, and angular profile as functions of time, by assuming that […]


Continue.. Cosmogenic Neutrino Point Source and KM3-230213A

Bumblebee cosmology: The FLRW solution and the CMB temperature anisotropy

Kavli Affiliate: Pau Amaro Seoane | First 5 Authors: Rui Xu, Dandan Xu, Lars Andersson, Pau Amaro Seoane, Lijing Shao | Summary: We put into test the idea of replacing dark energy by a vector field against the cosmic microwave background (CMB) observation using the simplest vector-tensor theory, where a massive vector field couples to […]


Continue.. Bumblebee cosmology: The FLRW solution and the CMB temperature anisotropy

Extracting cosmological information from the abundance of galaxy clusters with simulation-based inference

Kavli Affiliate: Anthony Challinor | First 5 Authors: Íñigo Zubeldia, Boris Bolliet, Anthony Challinor, William Handley, | Summary: The abundance of galaxy clusters as a function of mass and redshift is a well-established and powerful cosmological probe. Cosmological analyses based on galaxy cluster number counts have traditionally relied on explicitly computed likelihoods, which are often […]


Continue.. Extracting cosmological information from the abundance of galaxy clusters with simulation-based inference

Rapid and Late Cosmic Reionization Driven by Massive Galaxies: a Joint Analysis of Constraints from 21-cm, Lyman Line & CMB Data Sets

Kavli Affiliate: George Efstathiou | First 5 Authors: Peter H. Sims, Harry T. J. Bevins, Anastasia Fialkov, Dominic Anstey, Will J. Handley | Summary: Observations of the Epoch of Reionization (EoR) have the potential to answer long-standing questions of astrophysical interest regarding the nature of the first luminous sources and their effects on the intergalactic […]


Continue.. Rapid and Late Cosmic Reionization Driven by Massive Galaxies: a Joint Analysis of Constraints from 21-cm, Lyman Line & CMB Data Sets

Investigating the emission mechanism in the spatially-resolved jet of two z $approx$ 3 radio-loud quasars

Kavli Affiliate: Herman L. Marshall | First 5 Authors: Jaya Maithil, Daniel A. Schwartz, Aneta Siemiginowska, Preeti Kharb, Diana M. Worrall | Summary: This study focuses on high-redshift, z > 3, quasars where resolved X-ray jets remain underexplored in comparison to nearby sources. Building upon previous work, we identify and confirm extended kpc-scale jets emission […]


Continue.. Investigating the emission mechanism in the spatially-resolved jet of two z $approx$ 3 radio-loud quasars