Publications (30)
Dirac-Brueckner Approach to Hyperon Interactions and Hypernuclei
H. Lenske, C. M. Keil, F. Hofmann +1
The density dependent relativistic hadron (DDRH) theory is introduced as an effective field theory for nuclei and hypernuclei. A Dirac-Brueckner approach to in-medium nucleon-hyper…
X-ray source variability study of the M 31 central field using Chandra HRC-I
F. Hofmann, W. Pietsch, M. Henze +5
[Abridged] The central field of the Andromeda galaxy (M 31) has been monitored, using the Chandra HRC-I detector (about 0.1-10 keV energy range) from 2006 to 2012 with the main aim…
Lattice swelling and modulus change in a helium-implanted tungsten alloy: X-ray micro-diffraction, surface acoustic wave measurements, and multiscale modelling
F. Hofmann, D. Nguyen-Manh, C. E. Beck +7
Using X-ray micro-diffraction and surface acoustic wave spectroscopy, we measure lattice swelling and elastic modulus changes in a W-1%Re alloy after implantation with 3110 appm of…
Many-body Theory at Extreme Isospin
H. Lenske, C. M. Keil, F. Hofmann
The structure of nuclei far off beta-stability is investigated by nuclear many-body theory. In-medium interactions for asymmetric nuclear matter are obtained by (Dirac-) Brueckner…
CHEERS: The chemical evolution RGS sample
J. de Plaa, J. S. Kaastra, N. Werner +17
The chemical yields of supernovae and the metal enrichment of the hot intra-cluster medium (ICM) are not well understood. This paper introduces the CHEmical Enrichment RGS Sample (…
Characterisation of Corrosion Damage in T91/F91 steel exposed to Liquid Lead-Bismuth Eutectic
M. T. Lapington, M. Zhang, M. P. Moody +3
T91 samples were exposed to static liquid lead-bismuth eutectic (LBE) at 700°C for 250-500 hours in either an oxidising or reducing environment. Corrosion damage was characterised…
On the challenge to improve the density response with unusual gradient approximations
J. Garhammer, F. Hofmann, R. Armiento +1
Certain excitations, especially ones of long-range charge transfer character, are poorly described by time-dependent density functional theory (TDDFT) when typical (semi-)local fun…
Synthetic simulations of the extragalactic sky seen by eROSITA. I. Pre-launch selection functions from Monte-Carlo simulations
N. Clerc, M. E. Ramos-Ceja, J. Ridl +15
Studies of galaxy clusters provide stringent constraints on models of structure formation. Provided that selection effects are under control, large X-ray surveys are well suited to…
Hartree Fock Calculations in the Density Matrix Expansion Approach
F. Hofmann, H. Lenske
The density matrix expansion is used to derive a local energy density functional for finite range interactions with a realistic meson exchange structure. Exchange contributions are…
CMOS-Based Biosensor Arrays
R. Thewes, C. Paulus, M. Schienle +12
CMOS-based sensor array chips provide new and attractive features as compared to today's standard tools for medical, diagnostic, and biotechnical applications. Examples for molecul…
Reply to comment on: "An X-ray chimney extending hundreds of parsecs above and below the Galactic Centre"
G. Ponti, F. Hofmann, E. Churazov +5
In response to the comment posted by Nakashima et al. (arXiv:1903.1176), regarding prior claims for the features that we referred to as the Galactic Center Chimneys (2019, Nature,…
The structure of lambda hypernuclei
C. Keil, F. Hofmann, H. Lenske
The density dependent relativistic hadron field theory is extended to also describe strange systems. It is seen that the application to hypernuclei works extremely well. Important…
Thermodynamic perturbations in the X-ray halo of 33 clusters of galaxies observed with Chandra ACIS
F. Hofmann, J. S. Sanders, K. Nandra +2
In high-resolution X-ray observations of the hot plasma in clusters of galaxies significant structures caused by AGN feedback, mergers, and turbulence can be detected. Many cluster…
Supersoft X-rays reveal a classical nova in the M 31 globular cluster Bol 126
M. Henze, W. Pietsch, F. Haberl +17
[Abridged] Classical novae (CNe) represent the main class of supersoft X-ray sources (SSSs) in the central region of our neighbouring galaxy M 31. Only three confirmed novae and th…
Density dependent hadron field theory for hypernuclei
C. M. Keil, F. Hofmann, H. Lenske
The Density Dependent Relativistic Hadron Field (DDRH) theory, previously introduced and applied to isospin nuclei, is extended to hypernuclei by including the octet hyperons. Infi…
Probing Isospin Dynamics in Halo Nuclei
H. Lenske, F. Hofmann, C. M. Keil
Nuclear many-body theory is used to study nuclear matter and finite nuclei at extreme isospin. In-medium interactions in asymmetric nuclear matter are obtained from (Dirac-) Brueck…
eROSITA cluster cosmology forecasts: cluster temperature substructure bias
F. Hofmann, J. S. Sanders, N. Clerc +6
The eROSITA mission will provide the largest sample of galaxy clusters detected in X-ray to date (one hundred thousand expected). This sample will be used to constrain cosmological…
7.1 keV sterile neutrino constraints from X-ray observations of 33 clusters of galaxies with Chandra ACIS
F. Hofmann, J. S. Sanders, K. Nandra +2
Recently an unidentified emission line at 3.55 keV has been detected in X-ray spectra of clusters of galaxies. The line has been discussed as a possible decay signature of 7.1 keV…
Density dependent hadron field theory for asymmetric nuclear matter and exotic nuclei
F. Hofmann, C. M. Keil, H. Lenske
The density dependent relativistic hadron field (DDRH) theory is applied to strongly asymmetric nuclear matter and finite nuclei far off stability. A new set of in-medium meson-nuc…
Simulated TEM imaging of a heavily irradiated metal
D. R. Mason, M. Boleininger, J. Haley +4
We recast the Howie-Whelan equations for generating simulated transmission electron microscope (TEM) images, replacing the dependence on local atomic displacements with atomic posi…
Application of the density dependent hadron field theory to neutron star matter
F. Hofmann, C. M. Keil, H. Lenske
The density dependent hadron field (DDRH) theory, previously applied to isospin nuclei and hypernuclei is used to describe -stable matter and neutron stars under consideration…
X-ray monitoring of classical novae in the central region of M31. III. Autumn and winter 2009/10, 2010/11 and 2011/12
M. Henze, W. Pietsch, F. Haberl +7
[Abridged] Classical novae (CNe) represent the major class of supersoft X-ray sources (SSSs) in the central region of our neighbouring galaxy M31. We performed a dedicated monitori…
Feedback, scatter and structure in the core of the PKS 0745-191 galaxy cluster
J. S. Sanders, A. C. Fabian, J. Hlavacek-Larrondo +5
We present Chandra X-ray Observatory observations of the core of the galaxy cluster PKS 0745-191. Its centre shows X-ray cavities caused by AGN feedback and cold fronts with an ass…
A White Paper on keV Sterile Neutrino Dark Matter
R. Adhikari, M. Agostini, N. Anh Ky +133
We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, and par…
Measuring bulk flows of the intracluster medium in the Perseus and Coma galaxy clusters using XMM-Newton
J. S. Sanders, K. Dennerl, H. R. Russell +7
We demonstrate a novel technique for calibrating the energy scale of the XMM EPIC-pn detector, which allows us to measure bulk flows in the intracluster medium (ICM) of the Perseus…
7.1 keV sterile neutrino dark matter constraints from a deep Chandra X-ray observation of the Galactic bulge Limiting Window
F. Hofmann, C. Wegg
Recently an unidentified emission line at 3.55 keV has been detected in X-ray spectra of clusters of galaxies. The line has been discussed as a possible decay signature of 7.1 keV…
New transient Galactic bulge intermediate polar candidate XMMU J175035.2-293557
F. Hofmann, G. Ponti, F. Haberl +1
For the past decades a rare subclass of cataclysmic variables (CV), with magnetized white dwarfs (WD) as accretors has been studied and called intermediate polars (IP). They have b…
Nanoscale lattice strains in self-ion implanted tungsten
N. W. Phillips, H. Yu, S. Das +6
Developing a comprehensive understanding of the modification of material properties by neutron irradiation is important for the design of future fission and fusion power reactors.…
The Galactic Centre Chimney
G. Ponti, F. Hofmann, E. Churazov +6
Evidence has increasingly mounted in recent decades that outflows of matter and energy from the central parsecs of our Galaxy have shaped the observed structure of the Milky Way on…
Interests of a new lunar laser instrumentation on the ESO NTT Telescope
A. Fienga, C. Courde, J. M. Torre +9
We analyze the impact of the installation of a lunar laser ranging device on the NTT 3.6m ESO telescope. With such an instrument, the scientific communities of fundamental physics…