Simeon Reusch
A5090567289- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Particle physics theoretical and experimental studies
- Pulsars and Gravitational Waves Research
- Optical Systems and Laser Technology
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Radio Wave Propagation Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Ionosphere and magnetosphere dynamics
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Mass Spectrometry Techniques and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Advanced Chemical Physics Studies
- Precipitation Measurement and Analysis
- Radiation Detection and Scintillator Technologies
- Atmospheric and Environmental Gas Dynamics
- Astronomical Observations and Instrumentation
- Cryospheric studies and observations
Deutsches Elektronen-Synchrotron DESY
2020-2024
Humboldt-Universität zu Berlin
2019-2024
The University of Texas at Arlington
2021-2024
Lawrence Berkeley National Laboratory
2023-2024
Southern University and Agricultural and Mechanical College
2021-2024
Clark Atlanta University
2021-2024
Providence College
2021-2024
University of Alaska Anchorage
2021-2024
UCLouvain
2023
TU Dortmund University
2023
The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one was associated with a tidal disruption event (TDE). Here we present AT2019fdr, an exceptionally luminous TDE candidate, coincident another neutrino. Our observations, including bright dust echo and soft late-time x-ray emission, further support origin this flare. probability finding two such events by chance is just 0.034%. We evaluate several models for production show that AT2019fdr capable producing...
ABSTRACT The origin of cosmic high-energy neutrinos remains largely unexplained. For neutrino alerts from IceCube, a coincidence with time-variable emission has been seen for three different types accreting black holes: (1) gamma-ray flare blazar (TXS 0506+056), (2) an optical transient following stellar tidal disruption event (TDE; AT2019dsg), and (3) outburst active galactic nucleus (AGN; AT2019fdr). the latter two sources, infrared follow-up observations revealed powerful reverberation...
Both multi-messenger astronomy and new high-throughput wide-field surveys require flexible tools for the selection analysis of astrophysical transients. We here introduce Alert Management, Photometry Evaluation Lightcurves (AMPEL) system, an framework designed suited streamed data. AMPEL combines functionality alert broker with a generic capable hosting user-contributed code, that encourages provenance keeps track varying information states transient displays. The latter concept includes...
The Zwicky Transient Facility (ZTF) performs a systematic neutrino follow-up program, searching for optical counterparts to high-energy neutrinos with dedicated Target-of-Opportunity (ToO) observations. Since first light in March 2018, ZTF has taken prompt observations 24 high-quality alerts from the IceCube Neutrino Observatory, median latency of 12.2 hours initial detection. From two these campaigns, we have already reported tidal disruption event (TDE) AT 2019dsg and likely TDE 2019fdr as...
During the first half of fourth observing run (O4a) International Gravitational Wave Network (IGWN), Zwicky Transient Facility (ZTF) conducted a systematic search for kilonova (KN) counterparts to binary neutron star (BNS) and star-black hole (NSBH) merger candidates. Here, we present comprehensive study five high-significance (FAR < 1 per year) BNS NSBH candidates in O4a. Our follow-up campaigns relied on both target-of-opportunity observations (ToO) re-weighting nominal survey schedule...
Modern time-domain astronomical surveys produce high throughput data streams which require tools for processing and analysis. This will be critical programs making full use of the alert stream from Vera Rubin Observatory (VRO), where spectroscopic labels only available a small subset all transients. In this context, AMPEL toolset can work as code-to-data platform development efficient, reproducible flexible workflows real-time application. We here introduce three different channels...
Modern time-domain astronomical surveys produce high throughput data streams that require tools for processing and analysis. This will be critical programs making full use of the alert stream from Vera Rubin Observatory (VRO), where spectroscopic labels only available a small subset all transients. We introduce how AMPEL toolset can work as code-to-data platform development efficient, reproducible flexible workflows real-time application. The Extended LSST Astronomical Time-series...
We have measured cross sections for the correlated emission of two K x rays following collision hydrogenlike sulfur ions with ${\mathrm{H}}_{2}$ in energy range between 70 and 160 MeV. The observation is interpreted as a resonant capture target electron accompanied by simultaneous excitation projectile (RTE). By our distinguishing K\ensuremath{\alpha} K\ensuremath{\beta} lines, contributions from KLL KLn (n\ensuremath{\ge}M) resonances could be determined independently.
We present a systematic search for optical counterparts to 13 gravitational wave (GW) triggers involving at least one neutron star during LIGO/Virgo's third observing run. searched binary (BNS) and black hole (NSBH) merger localizations with the Zwicky Transient Facility (ZTF) undertook follow-up Global Relay of Observatories Watching Transients Happen (GROWTH) collaboration. The GW had median localization 4480 deg^2, distance 267 Mpc false alarm rates ranging from 1.5 1e-25 per yr. ZTF...
The origin of cosmic high-energy neutrinos remains largely unexplained. For neutrino alerts from IceCube, a coincidence with time-variable emission has been seen for three different types accreting black holes: (1) gamma-ray flare blazar (TXS 0506+056), (2) an optical transient following stellar tidal disruption event (TDE; AT2019dsg), and (3) outburst active galactic nucleus (AGN; AT2019fdr). the latter two sources, infrared follow-up observations revealed powerful reverberation signal due...
The nature of the progenitor systems and explosion mechanisms that give rise to Type Ia supernovae (SNe Ia) are still debated. interaction signature circumstellar material (CSM) being swept up by expanding ejecta can constrain type system from which it was ejected. Most previous studies have focused on finding CSM ejected shortly before SN residing close site, resulting in short delay times until starts. We use a sample 3627 SNe Zwicky Transient Facility discovered between 2018 2020 search...
The spectrum of neonlike gold (+69) is observed in a beam-foil light source utilizing an x-ray crystal spectrograph. Precision wavelength determinations indicate variations from multi- configurational Dirac-Fock calculations for states sampling the 2s hole consistent with previous observations bismuth (+73).
Early observations of transient explosions can provide vital clues to their progenitor origins. In this paper we present the nearby Type Iax (02cx-like) supernova (SN), SN 2020udy that was discovered within hours ($\sim$7 hr) estimated first light. An extensive dataset ultra-violet, optical, and near-infrared obtained, covering out $\sim$150 d after explosion. peaked at -17.86$\pm$0.43 mag in r band evolved similarly other 'luminous' SNe Iax, such as 2005hk 2012Z. Its well-sampled early...
The {ital n}=3 to 2 transitions in Ne-like, Na-like, and Mg-like bismuth were measured on the UNILAC accelerator at Gesellschaft fuer Schwerionenforschung Darmstadt, West Germany, using Lawrence Livermore National Laboratory high-resolution double-crystal spectrometer. measurements cover region 10--14 keV with precisions of order 100 ppm include electric-dipole quadrupole transitions. Theoretical multiconfigurational Dirac-Fock calculations made for Ne-like system compared experiment. data...
Abstract The Fermi Gamma-ray Burst Monitor (GBM) triggers on-board in response to ∼40 short gamma-ray bursts (SGRBs) per year; however, their large localization regions have made the search for optical counterparts a challenging endeavour. We developed and executed an extensive program with wide field of view Zwicky Transient Facility (ZTF) camera, mounted on Palomar 48 inch Oschin telescope (P48), perform target-of-opportunity (ToO) observations 10 Fermi-GBM SGRBs during 2018 2020–2021....
Abstract Optical surveys have become increasingly adept at identifying candidate tidal disruption events (TDEs) in large numbers, but classifying these generally requires extensive spectroscopic resources. Here we present tdescore , a simple binary photometric classifier that is trained using systematic census of ∼3000 nuclear transients from the Zwicky Transient Facility (ZTF). The sample highly imbalanced, with TDEs representing ∼2% total. nonetheless able to reject non-TDEs 99.6%...
We present the first homogeneous release of several thousand Type Ia supernovae (SNe Ia), all having spectroscopic classification, and redshifts for half sample. This release, named "DR2", contains 3628 nearby (z < 0.3) SNe discovered, followed classified by Zwicky Transient Facility survey between March 2018 December 2020. Of these, 3000 have good-to-excellent sampling 2667 pass standard cosmology light-curve quality cuts. is thus largest SN to date, increasing an order magnitude number...
We measured the 2E1 decay of 1s2s $^{1}$${\mathit{S}}_{0}$\ensuremath{\rightarrow}1${\mathit{s}}^{2}$ $^{1}$${\mathit{S}}_{0}$ transition in He-like germanium for 12- to 19-MeV/u ${\mathrm{Ge}}^{31+}$+${\mathrm{H}}_{2}$ collisions. The resonant population 2s2p $^{1}$${\mathit{P}}_{1}$ state by transfer excitation was isolated due its cascading state. experimental cross sections compare well with calculations using dielectronic recombination rates. method gives unique possibility populate...