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HONEST Workshops: Hot Topics in High Energy Astrophysics

26–28 Nov 2024
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Europe/Madrid timezone

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Contribution List

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  1. 10. Welcome
    Emma de Oña Wilhelmi (DESY), Rubén López Coto (IAA - CSIC)
    26/11/2024, 09:00
  2. 11. Introduction and motivation for the workshop
    Emma de Oña Wilhelmi (DESY), Rubén López Coto (IAA - CSIC)
    26/11/2024, 09:05
  3. 16. Lessons learnt from Fermi-LAT pulsars
    Pablo Saz Parkinson
    26/11/2024, 09:20
  4. 12. The Crab Pulsar's Very High Energy emission: Insights from GeV to TeV Energies
    Rubén López Coto (IAA - CSIC)
    26/11/2024, 09:40

    The Crab Pulsar is one of the few pulsars detected from GeV up to TeV energies. This talk will review recent gamma-ray observations of the pulsar performed with Imaging Atmospheric Cherenkov Telescopes (IACTs) and analyze their implications for current theoretical models that aim to explain the Very High Energy (VHE) emission from this source.

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  5. 13. Geminga: the first discovered VHE middle-aged pulsar
    Giulia Brunelli
    26/11/2024, 10:00

    The detection of Very-High-Energy emission from pulsars is one of the milestone results in the field. Among the few sources know to date, Geminga is the only one with an age of a few hundred kilo-years. From its discovery to the recent observations with Cherenkov Telescopes, Geminga never ceases to surprise us.

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  6. 14. Vela: the highest pulsed energies ever detected
    Emma de Oña Wilhelmi (DESY)
    26/11/2024, 10:50
  7. 15. Testing for a "Crab-like" Emission Tail above 10 GeV from the Vela Pulsar and PSR B1706-44 using combined H.E.S.S. & Fermi-LAT data
    Maxime Regeard
    26/11/2024, 11:10

    Measuring pulsar spectra in the tens of GeV range is crucial for constraining high-energy emission models, but this effort is hindered by limited Fermi-LAT statistics and the sensitivity constraints of ground-based telescopes. In this study, we analyze data from the largest H.E.S.S. telescope (CT-5) and Fermi-LAT to measure the spectra of the Vela pulsar and PSR B1706-44 in the 1–100 GeV...

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  8. 17. The many facets of transitional millisecond pulsars: can accretion- and rotation-powered states coexist?
    Giulia Illiano
    26/11/2024, 11:30

    The increasingly thrilling investigation of millisecond pulsars has recently overturned a long-standing paradigm. Traditionally, these pulsars were thought to shine as rotation-powered radio and/or gamma-ray sources only after a Gyr-long, X-ray bright phase fueled by the accretion of matter from a low-mass donor star. However, transitional millisecond pulsars challenge this classification by...

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  9. 30. The Pulsar Tree: Visualizing the Pulsar Population using Graph Theory Techniques. Applications from Binary Pulsars to Fast Radio Bursts
    Carlos Rodríguez García (Institute of Space Science (ICE))
    26/11/2024, 13:00
  10. 31. Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4–650224
    Dr Arianna Manca (Università degli Studi di Cagliari/INAF)
    26/11/2024, 13:05
  11. 32. A quantitative analysis of the similarity of gamma-ray pulsar light curves
    Diego Torres (ICREA & ICE-CSIC)
    26/11/2024, 13:10
  12. 33. Pulsar wind nebulae meeting the circumstellar medium of their progenitors
    Dominique Meyer (Institut of Space Science (ICE,CSIC) Barcelona)
    26/11/2024, 13:15
  13. 34. Overview of the VERITAS VHE and optical pulsar programs
    Samantha Wong (McGill University)
    26/11/2024, 13:20
  14. 3. Pulsar striped wind emission: a multi-wavelength and population synthesis perspective
    27/11/2024, 13:00

    Since the launch of the Fermi/LAT telescope in June 2008, several hundred radio-loud gamma-ray pulsars have been detected. Observing simultaneously their radio and gamma-ray pulse profiles helps to constrain the geometry and radiation mechanisms within their magnetosphere and to localize the photon production sites. In this talk I show how time-aligned gamma-ray light curve fitting of young...

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  15. 4. Modeling the observed spectra and light curves of synchro-curvature emission of pulsars
    Daniele Viganò
    27/11/2024, 13:20

    In this talk, we will review the synchro-curvature modeling of high-energy radiation from pulsars. Through a minimalist model containing only three essential free parameters, the model is able to fit the spectra of the entire population of pulsars, showing trends between the magnitude of the electric field and the parameter associated to the typical lengthscale of the acceleration region. We...

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  16. 5. Relativistic winds
    Dmitry Khangulyan
    27/11/2024, 13:40
  17. 6. Pulsed TeV emission from pulsars in the sychrocurvature/inverse-Compton framework
    Venter Christo
    27/11/2024, 14:00

    A number of pulsars have now been detected by ground-based Cherenkov telescopes, including PSR B1706-44, Geminga, Crab, and Vela. Vela exhibits a TeV component that is distinct from its GeV one, in contrast to the other detected pulsars. In the synchro-curvature radiation / inverse Compton (SCR-IC) framework, the same particles that are responsible for the GeV emission via SCR (with Lorentz...

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  18. 9. Electron-positron cascades in pulsars
    Andrey Timokhin
    27/11/2024, 14:50
  19. 8. Analytical approaches for the study of the VHE emission of pulsar spectra
    Claire Guépin
    27/11/2024, 15:10
  20. 7. Numerical approaches for the study of the VHE emission of pulsar spectra
    Alexander Philippov
    27/11/2024, 15:30
  21. 18. Inverse Compton pulse profiles inferred from global PIC simulations
    Cerutti Benoît
    28/11/2024, 09:00
  22. 19. High energy end of pulsar spectra, what is at stake?
    Arache djannati-Ataï
    28/11/2024, 09:20

    The fundamental concepts underlying pulsar mechanics—namely, the central engine, magnetosphere, and wind—date back several decades. It would not be an exaggeration to say that the detection and characterization of gamma-ray emission from pulsars have played a pivotal role in challenging and advancing our understanding of acceleration and radiation processes in these objects. This progress...

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  23. 20. Timing the future: pulsar ephemerides
    Giovanni Ceribella
    28/11/2024, 09:40

    The field of high-energy pulsars is experiencing a fast development driven by the observations of Fermi-LAT, the current IACT experiments (MAGIC, VERITAS, H.E.S.S.), and CTAO. The detailed study of the emission properties and the proper accumulation of events require more and more advanced techniques to precisely determine the rotation parameters of pulsars and their evolution (rotational...

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  24. 22. Prospects for the detection of very-high-energy pulsars with LHAASO and SWGO
    Kaikai Duan
    28/11/2024, 10:00

    Pulsations from the Crab pulsar and the Vela pulsar have been detected at high energies by IACT. Potential candidates for detection with EAS experiments at very-high-energy (VHE) ranges have been identified. Our findings indicate that LHAASO and SWGO could detect these signal within a few years which will enhance understanding of VHE pulsar emissions.

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  25. 21. Prospects using the Cherenkov Telescope Array Observatory
    Roberta Zanin
    28/11/2024, 10:50
  26. 23. Summary/review of the workshop
    Felix Aharonian
    28/11/2024, 11:10
  27. 27. A quantitative analysis of the similarity of gamma-ray pulsar light curves
    Diego Torres (ICREA & ICE-CSIC)

    In this talk, I will present a method to measure the morphological similarity of pulsar light curves and apply it to those recorded in the Third Fermi Pulsar Catalog. The method produces a quantitative determination for the similiarity of time series, something that is usually only qualitatively discussed via light curve features (such as the number of peaks, their relative height and...

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  28. 25. Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4–650224
    Arianna Manca (Università degli Studi di Cagliari/INAF)

    Transitional millisecond pulsars (tMSPs) represent a crucial link between binary pulsars in their rotation-powered and accretion-powered states. During their active X-ray state, the tMSPs are the only low-mass X-ray binary systems that are detected up to GeV energies using the Fermi Large Area Telescope (LAT). CXOU J110926.4-650224 is a newly discovered tMSP candidate in an active X-ray...

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  29. 1. Main session
  30. 2. Main session
  31. 29. Overview of the VERITAS VHE and optical pulsar programs
    Samantha Wong (McGill University)

    With very few pulsars detected in both optical and VHE - the edges of the high-energy pulsar spectrum - it remains difficult to infer pulsar emission mechanisms from observational data. VERITAS observation programs aim to populate these discovery spaces by searching for multi-TeV components from Northern Hemisphere pulsars and optical pulsations from energetic X-ray and Fermi-LAT pulsars with...

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  32. 28. Pulsar wind nebulae meeting the circumstellar medium of their progenitors
    Dominique Meyer (Institut of Space Science (ICE,CSIC) Barcelona)

    A significative fraction of high-mass stars sail away through the interstellar medium of the galaxies. Once they evolved and died via a core-collapse supernova, a magnetized, rotating neutron star (a pulsar) is usually their leftover. The immediate surroundings of the pulsar is the pulsar wind, which forms a nebula whose morphology is shaped by the supernova ejecta, channeled into the...

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  33. 24. The Pulsar Tree: Visualizing the Pulsar Population using Graph Theory Techniques. Applications from Binary Pulsars to Fast Radio Bursts
    Carlos Rodríguez García (Institute of Space Science (ICE)), Diego F. Torres (Institute of Space Science (ICE))

    This talk will present an innovative application of graph theory using a type of graph known as the Minimum Spanning Tree (MST). This technique provides a novel tool to visualize and classify the population of pulsars by representing them together with their properties as nodes and edges through the MST, offering relationships and groupings that go beyond the traditional P-Pdot diagram. The...

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