248 citations · 3.8k across the 89 of their papers we have counts for
25 papers · 1 filter
The cosipy library: COSI's high-level analysis software
Israel Martinez-Castellanos, Savitri Gallego, Chien-You Huang +72
The Compton Spectrometer and Imager (COSI) is a selected Small Explorer (SMEX) mission launching in 2027. It consists of a large field-of-view Compton telescope that will probe wit…
New mechanisms for forming multiple hotspots in radio jets
Maya A. Horton, Martin G. H. Krause, Martin J. Hardcastle
Hotspots of radio galaxies are regions of shock-driven particle acceleration. Multiple hotspots have long been identified as potential indicators of jet movement or precession. Two…
Gamma-ray spectroscopy of galactic nucleosynthesis
Roland Diehl, Jochen Greiner, Martin Krause +2
Diffuse gamma-ray emission from the decay of radioactive Al is a messenger from the nucleosynthesis activity in our current-day galaxy. Because this material is attributed t…
CosmoDRAGoN simulations -- I. Dynamics and observable signatures of radio jets in cosmological environments
Patrick M. Yates-Jones, Stanislav S. Shabala, Chris Power +4
We present the Cosmological Double Radio Active Galactic Nuclei (CosmoDRAGoN) project: a large suite of simulated AGN jets in cosmological environments. These environments sample t…
PRAiSE: Resolved spectral evolution in simulated radio sources
Patrick M. Yates-Jones, Ross J. Turner, Stanislav S. Shabala +1
We present a method for applying spatially resolved adiabatic and radiative loss processes to synthetic radio emission from hydrodynamic simulations of radio sources from active ga…
Dynamics of relativistic radio jets in asymmetric environments
Patrick M. Yates-Jones, Stanislav S. Shabala, Martin G. H. Krause
We have carried out relativistic three-dimensional simulations of high-power radio sources propagating into asymmetric cluster environments. We offset the environment by 0 or 1 cor…
Reticulum II: Particle Dark Matter and Primordial Black Holes Limits
Thomas Siegert, Celine Boehm, Francesca Calore +4
Reticulum II (Ret II) is a satellite galaxy of the Milky Way and presents a prime target to investigate the nature of dark matter (DM) because of its high mass-to-light ratio. We e…
Can the Local Bubble explain the radio background?
Martin G. H. Krause, Martin J. Hardcastle
The ARCADE 2 balloon bolometer along with a number of other instruments have detected what appears to be a radio synchrotron background at frequencies below about 3 GHz. Neither ex…
Comparing simulated Al maps to gamma-ray measurements
Moritz M. M. Pleintinger, Thomas Siegert, Roland Diehl +4
Context. The diffuse gamma-ray emission of at 1.8 MeV reflects ongoing nucleosynthesis in the Milky Way, and traces massive-star feedback in the interstellar medium…
Constraints on positron annihilation kinematics in the inner Galaxy
Thomas Siegert, Roland M. Crocker, Roland Diehl +4
The annihilation of cosmic positrons () with electrons in the interstellar medium (ISM) results in the strongest persistent gamma-ray line signal in the sky. For 50 years, thi…
Positron Annihilation in the Galaxy
Carolyn A. Kierans, John F. Beacom, Steve Boggs +27
The 511 keV line from positron annihilation in the Galaxy was the first -ray line detected to originate from outside our solar system. Going into the fifth decade since the disc…
How frequent are close supermassive binary black holes in powerful jet sources?
Martin G. H. Krause, Stanislav S. Shabala, Martin J. Hardcastle +6
Supermassive black hole binaries may be detectable by an upcoming suite of gravitational wave experiments. Their binary nature can also be revealed by radio jets via a short-period…
Observability of intermittent radio sources in galaxy groups and clusters
Patrick Yates, Stanislav Shabala, Martin Krause
We have carried out numerical hydrodynamic simulations of radio jets from active galactic nuclei using the PLUTO simulation code, with the aim of investigating the effect of differ…
Extragalactic Radio Sources as a Piece of the Cosmological Jigsaw
Martin Krause
Early on, extragalactic radio sources have pointed to a cosmologically evolving Universe. They were also an important piece of evidence for the existence of supermassive black hole…
Search for 511 keV Emission in Satellite Galaxies of the Milky Way with INTEGRAL/SPI
Thomas Siegert, Roland Diehl, Aaron C. Vincent +3
The positron annihilation gamma-ray signal in the Milky Way (MW) shows a puzzling morphology: a very bright bulge and a very low surface-brightness disk. A coherent explanation of…
Positron annihilation signatures associated with the outburst of the microquasar V404 Cygni
Thomas Siegert, Roland Diehl, Jochen Greiner +7
Microquasars are stellar-mass black holes accreting matter from a companion star and ejecting plasma jets at almost the speed of light. They are analogues of quasars that contain s…
Gamma-ray spectroscopy of Positron Annihilation in the Milky Way
Thomas Siegert, Roland Diehl, Gerasim Khachatryan +5
The annihilation of positrons in the Galaxy's interstellar medium produces characteristic gamma-rays with a line at 511 keV. This emission has been observed with the spectrometer S…
Revisiting INTEGRAL/SPI observations of 44Ti from Cassiopeia A
Thomas Siegert, Roland Diehl, Martin G. H. Krause +1
The 340-year old supernova remnant Cassiopeia A at 3.4 kpc distance is the best-studied young core-collapse supernova remnant. Nucleosynthesis yields in radioactive isotopes have b…
SN2014J gamma-rays from the 56Ni decay chain
Roland Diehl, Thomas Siegert, Wolfgang Hillebrandt +7
The measurement of gamma-ray lines from the decay chain of 56Ni provides unique information about the explosion in supernovae. The 56Ni freshly-produced in the supernova powers the…
Early 56Ni decay γ-rays from SN2014J suggest an unusual explosion
Roland Diehl, Thomas Siegert, Wolfgang Hillebrandt +7
Type-Ia supernovae result from binary systems that include a carbon-oxygen white dwarf, and these thermonuclear explosions typically produce 0.5 M_solar of radioactive 56Ni. The 56…
Kinematics of massive star ejecta in the Milky Way as traced by 26Al
Karsten Kretschmer, Roland Diehl, Martin Krause +5
Massive stars form in groups and their winds and supernova explosions create superbubbles up to kpc in size. Their ejecta are important for the dynamics of the interstellar medium…
SPI Measurements of Nucleosynthesis Gamma-Rays
Roland Diehl, Frauke Alexander, Martin Krause +4
Studies based on the gamma-ray lines from radioactive decay of unstable isotopes produced in massive-star and supernova nucleosynthesis have been among INTEGRAL's prominent science…
Discovery of an X-ray cavity near the radio lobes of Cygnus A indicating previous AGN activity
Gayoung Chon, Hans Boehringer, Martin Krause +1
Cygnus A harbours the nearest powerful radio jet of an Fanaroff-Riley (FR) class II radio galaxy in a galaxy cluster where the interaction of the jet with the intracluster medium (…
Asymmetries in Extragalactic Double Radio Sources: Clues from 3D Simulations of Jet - Disc Interaction
Volker Gaibler, Sadegh Khochfar, Martin Krause
Observational and theoretical studies of extragalactic radio sources have suggested that an inhomogeneous environment may be responsible for observed arm length asymmetries of jets…