Prof. Dr. Stefan Funk

Research Projects

X-ray and optical phase contrast imaging Dosimetry and advanced photo detectors
Phase-contrast imaging of bio-medical materials Eye-lens dosimeter

Current projects

Messung der höchsten Energien des kosmischen Elektronenspektrums mit Hilfe von Deep Learning

(Third Party Funds Single)

Term: 1. December 2023 - 30. November 2026
Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)

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Gravitationswellenteleskope der dritten Generation

(Third Party Funds Single)

Term: 1. July 2023 - 30. June 2026
Funding source: Bundesministerium für Bildung und Forschung (BMBF)

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Entwicklung eines Zwei-Interferometer-Scanners zur zerstörungsfreien Analyse von Mikrostrukturen in metallischen Bauteilen mittels Dunkelfeld-Röntgenbildgebung

(Third Party Funds Single)

Term: 1. April 2023 - 31. March 2026
Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)

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Optimierung des Designs von Wasser-Cherenkov-Detektoren für die Gammastrahlenastronomie

(Third Party Funds Single)

Term: 1. July 2021 - 30. June 2024
Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)

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Optische Intensitätsinterferometrie mit den H.E.S.S. Gammastrahlungsteleskopen

(Third Party Funds Single)

Term: 1. January 2020 - 31. December 2023
Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)

Abstract

The aim of this project is to develop a system for optical intensity interferometry for the H.E.S.S gamma-ray telescopes in Namibia and to perform high-angular resolution measurement of stars in the V and R bands. The proposed project consists of three modules: a) development of the light-detection and electronics chain, b) development of the mechanical and optical struture and c) development of data analysis tools. We aim to demonstrate the feasibility of the full chain developed in this proposal to measure the stellar diameters of bright stars on timescales of a few hours (detect the signal at a projected 5-m baseline within minutes).

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Recent publications

2023

Aharonian, F., Ait Benkhali, F., Aschersleben, J., Ashkar, H., Backes, M., Barbosa Martins, V.,... Zywucka, N. (2023). Detection of extended γ -ray emission around the Geminga pulsar with H.E.S.S. Astronomy & Astrophysics, 673. https://dx.doi.org/10.1051/0004-6361/202245776
Aharonian, F., Aschersleben, J., Backes, M., Martins, V.B., Batzofin, R., Becherini, Y.,... Zywucka, N. (2023). Constraints on the Intergalactic Magnetic Field Using Fermi-LAT and H.E.S.S. Blazar Observations. Astrophysical Journal Letters, 950(2), L16. https://dx.doi.org/10.3847/2041-8213/acd777
Donath, A., Terrier, R., Remy, Q., Sinha, A., Nigro, C., Pintore, F.,... Zanin, R. (2023). Gammapy: A Python package for gamma-ray astronomy. Astronomy & Astrophysics, 678. https://dx.doi.org/10.1051/0004-6361/202346488
Schreiner, S., Rauch, C., Akstaller, B., Bleuel, P., Fröjdh, E., Martynenko, A.S.,... Funk, S. (2023). Electromagnetic pulse protective shielding for digital x-ray detectors. Review of Scientific Instruments, 94(7). https://dx.doi.org/10.1063/5.0160120

2022

Abdalla, H., Aharonian, F., Benkhali, F.A., Angüner, E.O., Armand, C., Ashkar, H.,... Zywucka, N. (2022). Search for Dark Matter Annihilation Signals in the H.E.S.S. Inner Galaxy Survey. Physical Review Letters, 129(11). https://dx.doi.org/10.1103/PhysRevLett.129.111101
Abdollahi, S., Acero, F., Baldini, L., Ballet, J., Bastieri, D., Bellazzini, R.,... Zaharijas, G. (2022). Incremental Fermi Large Area Telescope Fourth Source Catalog. Astrophysical Journal Supplement Series, 260(2). https://dx.doi.org/10.3847/1538-4365/ac6751
Addazi, A., Alvarez-Muniz, J., Alves Batista, R., Amelino-Camelia, G., Antonelli, V., Arzano, M.,... Zornoza, J.D. (2022). Quantum gravity phenomenology at the dawn of the multi-messenger era—A review. Progress in Particle and Nuclear Physics. https://dx.doi.org/10.1016/j.ppnp.2022.103948
Aharonian, F., Benkhali, F.A., Anguener, E.O., Ashkar, H., Backes, M., Baghmanyan, V.,... Zywucka, N. (2022). Time-resolved hadronic particle acceleration in the recurrent nova RS Ophiuchi. Science, 376(6588), 77-+. https://dx.doi.org/10.1126/science.abn0567
Aharonian, F., Benkhali, F.A., Angüner, E.O., Ashkar, H., Backes, M., Martins, V.B.,... Zywucka, N. (2022). Evidence for γ-ray emission from the remnant of Kepleras supernova based on deep H.E.S.S. observations. Astronomy & Astrophysics, 662. https://dx.doi.org/10.1051/0004-6361/202243096
Ajello, M., Atwood, W.B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D.,... Zaharijas, G. (2022). A gamma-ray pulsar timing array constrains the nanohertz gravitational wave background. Science, 376(6592), 521-+. https://dx.doi.org/10.1126/science.abm3231
Ajello, M., Baldini, L., Ballet, J., Bastieri, D., Gonzalez, J.B., Bellazzini, R.,... Zaharijas, G. (2022). The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3. Astrophysical Journal Supplement Series, 263(2). https://dx.doi.org/10.3847/1538-4365
Akstaller, B., Schreiner, S., Dietrich, L., Rauch, C., Schuster, M., Ludwig, V.,... Funk, S. (2022). X-ray Dark-Field Imaging for Improved Contrast in Historical Handwritten Literature. Journal of Imaging, 8(9). https://dx.doi.org/10.3390/jimaging8090226
Alnussirat, S., Altomare, C., Bose, R.G., Braun, D., Buckley, J.H., Buhler, J.D.,... Zober, W.V. (2022). The Advanced Particle-astrophysics Telescope: Simulation of the Instrument Performance for Gamma-Ray Detection. In Proceedings of Science. Berlin, DE: Sissa Medialab Srl.
Buckley, J.H., Alnussirat, S., Altomare, C., Bose, R.G., Braun, D., Buhler, J.D.,... Zober, W.V. (2022). The Advanced Particle-astrophysics Telescope (APT) Project Status. In Proceedings of Science. Virtual, Berlin, DEU: Sissa Medialab Srl.
Chibueze, J.O., Caleb, M., Spitler, L., Ashkar, H., Schussler, F., Stappers, B.W.,... Zywucka, N. (2022). A MeerKAT, e-MERLIN, HESS, and Swift search for persistent and transient emission associated with three localized FRBs. Monthly Notices of the Royal Astronomical Society, 515(1), 1365-1379. https://dx.doi.org/10.1093/mnras/stac1601
Hughes, Z., Alnussirat, S., Altomare, C., Bose, R.G., Braun, D., Buckley, J.H.,... Zober, W.V. (2022). Characterization of a prototype imaging calorimeter for the Advanced Particle-astrophysics Telescope from an Antarctic balloon flight and CERN beam test. In Proceedings of Science. Virtual, Berlin, DEU: Sissa Medialab Srl.
Karl, S., Zmija, A., Richter, S., Vogel, N., Malyshev, D., Zink, A.,... Funk, S. (2022). Comparing different approaches for stellar intensity interferometry. Monthly Notices of the Royal Astronomical Society, 512(2), 1722-1729. https://dx.doi.org/10.1093/mnras/stac489
Wolf, A., Akstaller, B., Cipiccia, S., Flenner, S., Hagemann, J., Ludwig, V.,... Funk, S. (2022). Single-exposure X-ray phase imaging microscopy with a grating interferometer. Journal of Synchrotron Radiation, 29, 794-806. https://dx.doi.org/10.1107/S160057752200193X
Zmija, A., Vogel, N., Anton, G., Malyshev, D., Michel, T., Zink, A., & Funk, S. (2022). Optical intensity interferometry lab tests in preparation of stellar diameter measurements at IACTs at GHz photon rates. Monthly Notices of the Royal Astronomical Society, 509(3), 3113-3118. https://dx.doi.org/10.1093/mnras/stab3058

2021

Abdalla, H., Aharonian, F., Benkhali, F.A., Anguner, E.O., Ashkar, H., Backes, M.,... Zouari, S. (2021). HESS Follow-up Observations of Binary Black Hole Coalescence Events during the Second and Third Gravitational-wave Observing Runs of Advanced LIGO and Advanced Virgo. Astrophysical Journal, 923(1). https://dx.doi.org/10.3847/1538-4357/ac2e04
Abdalla, H., Aharonian, F., Mitchell, A., Spencer, S., Benkhali, F.A., Anguner, E.O.,... Zywucka, N. (2021). Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase. Astrophysical Journal, 919(2). https://dx.doi.org/10.3847/1538-4357/ac0fe1
Abdalla, H., Mitchell, A., Aharonian, F., Spencer, S., Benkhali, F.A., Anguner, E.O.,... Zhou, H. (2021). TeV Emission of Galactic Plane Sources with HAWC and HESS. Astrophysical Journal, 917(1). https://dx.doi.org/10.3847/1538-4357/abf64b
Abdalla, H., Spencer, S., Aharonian, F., Ait Benkhali, F., Anguner, E.O., Arcaro, C.,... Zywucka, N. (2021). Search for Dark Matter Annihilation Signals from Unidentified Fermi-LAT Objects with HESS. Astrophysical Journal, 918(1). https://dx.doi.org/10.3847/1538-4357/abff59
Adams, C.B., Alfaro, R., Ambrosi, G., Ambrosio, M., Aramo, C., Arlen, T.,... Zink, A. (2021). Detection of the Crab Nebula with the 9.7 m prototype Schwarzschild-Couder telescope. Astroparticle Physics, 128. https://dx.doi.org/10.1016/j.astropartphys.2021.102562
Ajello, M., Atwood, W.B., Axelsson, M., Baldini, L., Barbiellini, G., Baring, M.G.,... Zaharijas, G. (2021). High-energy emission from a magnetar giant flare in the Sculptor galaxy. Nature Astronomy. https://dx.doi.org/10.1038/s41550-020-01287-8
Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R.,... Zrake, J. (2021). Gamma Rays from Fast Black-hole Winds. Astrophysical Journal, 921(2). https://dx.doi.org/10.3847/1538-4357/ac1bb2
Ajello, M., Baldini, L., Bastieri, D., Bellazzini, R., Berretta, A., Bissaldi, E.,... Zaharijas, G. (2021). First Fermi-LAT Solar Flare Catalog. Astrophysical Journal Supplement Series, 252(2). https://dx.doi.org/10.3847/1538-4365/abd32e
Ajello, M., Baldini, L., Bastieri, D., Bellazzini, R., Berretta, A., Bissaldi, E.,... Zaharijas, G. (2021). Erratum: First fermi-LAT solar flare catalog (Astrophysical Journal, Supplement Series (2021) 252 (13) DOI: 10.3847/1538-4365/abd32e). Astrophysical Journal Supplement Series, 256(1). https://dx.doi.org/10.3847/1538-4365/ac2155
Akstaller, B., Schreiner, S., Hofmann, F., Meyer, P., Neumayer, P., Schuster, M.,... Funk, S. (2021). Single-shot grating-based phase-contrast imaging of a micrometer sample at a laser-driven x-ray backlighter source. Journal of Instrumentation, 16(6). https://dx.doi.org/10.1088/1748-0221/16/06/P06021
Baldini, L., Ballet, J., Bastieri, D., Becerra Gonzalez, J., Bellazzini, R., Berretta, A.,... Zaharijas, G. (2021). Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data. Astrophysical Journal Supplement Series, 256(1). https://dx.doi.org/10.3847/1538-4365/ac072a
Koddenberg, T., Greving, I., Hagemann, J., Flenner, S., Krause, A., Laipple, D.,... Nopens, M. (2021). Three-dimensional imaging of xylem at cell wall level through near field nano holotomography. Scientific Reports, 11(1). https://dx.doi.org/10.1038/s41598-021-83885-8
Schreiner, S., Akstaller, B., Dietrich, L., Meyer, P., Neumayer, P., Schuster, M.,... Funk, S. (2021). Noise reduction for single-shot grating-based phase-contrast imaging at an x-ray backlighter. Journal of Imaging, 7(9). https://dx.doi.org/10.3390/jimaging7090178
Taylor, A.M., Aharonian, F., Romoli, C., Khangulyan, D., Ruiz-Velasco, E., Schüssler, F.,... Page, K. (2021). Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow. Science, 372(6546), 1081-1085. https://dx.doi.org/10.1126/science.abe8560

2020

Abdalla, H., Adam, R., Aharonian, F., Benkhali, F.A., Anguner, E.O., Arakawa, M.,... Cerruti, M. (2020). Very high energy gamma-ray emission from two blazars of unknown redshift and upper limits on their distance. Monthly Notices of the Royal Astronomical Society, 494(4), 5590-5602. https://dx.doi.org/10.1093/mnras/staa999
Abdalla, H., Adam, R., Aharonian, F., Benkhali, F.A., Anguner, E.O., Arakawa, M.,... Smith, P.S. (2020). HESS detection of very high-energy gamma-ray emission from the quasar PKS 0736+017. Astronomy & Astrophysics, 633. https://dx.doi.org/10.1051/0004-6361/201935906
Abdalla, H., Adam, R., Aharonian, F., Benkhali, F.A., Anguner, E.O., Arakawa, M.,... Bordas, P. (2020). HESS and Fermi-LAT observations of PSR B1259-63/LS 2883 during its 2014 and 2017 periastron passages. Astronomy & Astrophysics, 633. https://dx.doi.org/10.1051/0004-6361/201936621
Abdollahi, S., Acero, F., Ackermann, M., Ajello, M., Atwood, W.B., Axelsson, M.,... Zaharijas, G. (2020). Fermi Large Area Telescope Fourth Source Catalog. Astrophysical Journal Supplement Series, 247(1). https://dx.doi.org/10.3847/1538-4365/ab6bcb
Ajello, M., Angioni, R., Axelsson, M., Ballet, J., Barbiellini, G., Bastieri, D.,... Yassine, M. (2020). The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope. Astrophysical Journal, 892(2). https://dx.doi.org/10.3847/1538-4357/ab791e
Ajello, M., Arimoto, M., Axelsson, M., Baldini, L., Barbiellini, G., Bastieri, D.,... De Pasquale, M. (2020). Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-energy Emission from Prompt to Afterglow. Astrophysical Journal, 890(1). https://dx.doi.org/10.3847/1538-4357/ab5b05
Fiuza, F., Swadling, G.F., Grassi, A., Rinderknecht, H.G., Higginson, D.P., Ryutov, D.D.,... Park, H.-S. (2020). Electron acceleration in laboratory-produced turbulent collisionless shocks. Nature Physics. https://dx.doi.org/10.1038/s41567-020-0919-4
Principe, G., Mitchell, A.M.W., Caroff, S., Hinton, J.A., Parsons, R.D., & Funk, S. (2020). Energy dependent morphology of the pulsar wind nebula HESSJ1825-137 with Fermi-LAT. Astronomy & Astrophysics, 640. https://dx.doi.org/10.1051/0004-6361/202038375
Seifert, M., Weule, M., Cipiccia, S., Flenner, S., Hagemann, J., Ludwig, V.,... Akstaller, B. (2020). Evaluation of the Weighted Mean X-ray Energy for an Imaging System Via Propagation-Based Phase-Contrast Imaging. Journal of Imaging, 6(7). https://dx.doi.org/10.3390/jimaging6070063
Wolf, A., Schuster, M., Ludwig, V., Anton, G., & Funk, S. (2020). Maximum likelihood reconstruction for grating-based X-ray microscopy. Optics Express, 28(9), 13553-13568. https://dx.doi.org/10.1364/OE.380940
Zmija, A., Deiml, P., Malyshev, D., Zink, A., Anton, G., Michel, T., & Funk, S. (2020). LED as laboratory test source for astronomical intensity interferometry. Optics Express, 28(4), 5248-5256. https://dx.doi.org/10.1364/OE.28.005248

Research Projects

Current projects

Messung der höchsten Energien des kosmischen Elektronenspektrums mit Hilfe von Deep Learning

Gravitationswellenteleskope der dritten Generation

Entwicklung eines Zwei-Interferometer-Scanners zur zerstörungsfreien Analyse von Mikrostrukturen in metallischen Bauteilen mittels Dunkelfeld-Röntgenbildgebung

Optimierung des Designs von Wasser-Cherenkov-Detektoren für die Gammastrahlenastronomie

Optische Intensitätsinterferometrie mit den H.E.S.S. Gammastrahlungsteleskopen

Recent publications

2023

2022

2021

2020

Related Research Fields

Contact:

Research Projects

Current projects Current projects

Messung der höchsten Energien des kosmischen Elektronenspektrums mit Hilfe von Deep Learning

Gravitationswellenteleskope der dritten Generation

Entwicklung eines Zwei-Interferometer-Scanners zur zerstörungsfreien Analyse von Mikrostrukturen in metallischen Bauteilen mittels Dunkelfeld-Röntgenbildgebung

Optimierung des Designs von Wasser-Cherenkov-Detektoren für die Gammastrahlenastronomie

Optische Intensitätsinterferometrie mit den H.E.S.S. Gammastrahlungsteleskopen

Recent publications Recent publications

2023

2022

2021

2020

Related Research Fields

Contact:

Current projects

Recent publications