A5032359203- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Neutrino Physics Research
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Radiomics and Machine Learning in Medical Imaging
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Photocathodes and Microchannel Plates
- Geophysics and Gravity Measurements
- Advanced Data Storage Technologies
- Radiation Therapy and Dosimetry
- GNSS positioning and interference
- Microbial Metabolic Engineering and Bioproduction
University of Leicester
2014-2018
Max Planck Institute for Nuclear Physics
2008-2016
Universitat de Barcelona
2008-2015
Universidad de Jaén
2008-2015
Max Planck Innovation
2015
Max Planck Society
2012-2015
Netherlands Institute for Radio Astronomy
2015
Max Planck Institute for Radio Astronomy
2015
University of Manchester
2015
Campbell Collaboration
2013-2015
We present the first public version (v0.2) of open-source and community-developed Python package, Astropy. This package provides core astronomy-related functionality to community, including support for domain-specific file formats such as Flexible Image Transport System (FITS) files, Virtual Observatory (VO) tables, common ASCII table formats, unit physical quantity conversions, constants specific astronomy, celestial coordinate time transformations, world system (WCS) support, generalized...
The ultimate goal of the observation nonthermal emission from astrophysical sources is to understand underlying particle acceleration and evolution processes, few tools are publicly available infer distribution properties observed photon spectra Xray VHE gamma rays.Here I present naima, an open source Python package that provides models for radiative homogeneous relativistic electrons protons.Contributions synchrotron, inverse Compton, bremsstrahlung, neutral-pion decay can be computed a...
The ultimate goal of the observation nonthermal emission from astrophysical sources is to understand underlying particle acceleration and evolution processes, few tools are publicly available infer distribution properties observed photon spectra X-ray VHE gamma rays. Here I present naima, an open source Python package that provides models for radiative homogeneous relativistic electrons protons. Contributions synchrotron, inverse Compton, bremsstrahlung, neutral-pion decay can be computed a...
The high and very-high energy spectrum of gamma-ray binaries has become a challenge for all theoretical explanations since the detection powerful, persistent GeV emission from LS 5039 I +61 303 by Fermi/LAT. spectral cutoff at few indicates that component fainter, hard TeV above 100 are not directly related. We explore possible origins these two components in framework young, non-accreting pulsar orbiting massive star, initiating non-thermal through interaction stellar winds. pulsar/stellar...
Gamma-ray loud X-ray binaries are binary systems that show non-thermal broadband emission from radio to gamma rays. If the system comprises a massive star and young non-accreting pulsar, their winds will collide producing emission, most likely originated in shocked pulsar wind. Thermal is expected stellar wind, but until now it has neither been detected nor studied context of gamma-ray binaries. We present semi-analytic model thermal wind binaries, find increases monotonically with spin-down...
The MAGIC collaboration has recently reported correlated X-ray and very high-energy gamma-ray emission from the binary LS I +61 303 during ~60% of one orbit. These observations suggest that in these two bands its origin a single particle population. We aim at improving our understanding source behaviour by explaining simultaneous VHE data through radiation model. use model based on zone population relativistic leptonic particles assuming dominant adiabatic losses located position compact...
η Car is the only colliding-wind binary for which high-energy γ rays are detected. Although physical conditions in shock region change on time-scales of hours to days, variability seen at GeV energies weak and significantly longer time-scales. The γ-ray spectrum exhibits two features that can be interpreted as emission from shocks either side contact discontinuity. Here, we report first time-dependent modelling non-thermal Car. We find primary electrons likely not responsible emission, but...
MWC 656 (=HD 215227) was recently discovered to be the first binary system composed of a Be star and black hole (BH). We observed it with XMM-Newton, detected faint X-ray source compatible position optical star, thus proving Be/BH binary. The spectrum analysis requires model fit two components, blackbody plus power law, keV photon index Γ = 1.0 ± 0.8, respectively. non-thermal component dominates above ≃0.8 keV. obtained total flux is F(0.3– erg cm−2 s−1. At distance 2.6 0.6 kpc translates...
<i>Context. <i/>MGRO J2019+37 is an unidentified extended source of very high energy gamma-rays originally reported by the Milagro Collaboration as brightest TeV in Cygnus region. Its emission could be powered either a single or several sources. The GeV pulsar AGL J2020.5+3653, discovered AGILE and associated with PSR J2021+3651, contribute to from MGRO J2019+37.<i>Aims. <i/>Our aim identify radio near-infrared sources field J2019+37, study potential counterparts explain its...
In gamma-ray astronomy, a variety of data formats and proprietary software have been traditionally used, often developed for one specific mission or experiment. Especially ground-based imaging atmospheric Cherenkov telescopes (IACTs), are mostly private to the collaborations operating telescopes. However, there is general movement in science towards use open software. addition, next-generation IACT instrument, Telescope Array (CTA), will be operated as an observatory.We created Github...
LS 5039 is a gamma-ray binary system observed in broad energy range, from radio to TeV energies. The exhibits both flux and spectral modulation as function of its orbital period. X-ray very-high-energy (VHE, E > 100 GeV) fluxes display maximum/minimum at inferior/superior conjunction, with spectra becoming respectively harder/softer, behaviour that completely reversed the high-energy domain (HE, 0.1 < GeV). HE spectrum cuts off few GeV, new hard component emerging 10 GeV compatible...
There are a number of very high energy sources in the Galaxy that remain unidentified. Multi-wavelength and variability studies, catalogue searches, powerful tools to identify physical counterpart, given uncertainty source location extension. This work carries out thorough multi-wavelength study unidentified, HESS J1858+020 its environs. Giant Metrewave Radio Telescope observations at 610 MHz 1.4 GHz have been done obtain deep, low-frequency radio image region surrounding J1858+020. Archival...
<i>Context. <i/>A short duration burst reminiscent of a soft gamma-ray repeater/anomalous X-ray pulsar behaviour was detected in the direction LS I +61 303 by <i>Swift<i/> satellite. While association with this well known binary is likely, different origin cannot be excluded.<i>Aims. <i/>We explore error box unexpected flaring event and establish radio, near-infrared sources our search for any peculiar alternative counterpart.<i>Methods. carried out combined analysis archive Very Large Array...
An extended observation campaign of the gamma-ray binary system PSR B1259$-$63 has been conducted with H.E.S.S. (High Energy Stereoscopic System) II 5-telescope array during system's periastron passage in 2014. We report on outcome this campaign, which consists more than 85 h data covering both pre- and post-periastron orbital phases. The lower energy threshold allows very-high-energy (VHE; $E \gtrsim 100$ GeV) emission from to be studied for first time down 200 GeV. new dataset partly...
We present an analysis of two Chandra observations LS 5039 performed in 2004 different orbital phases during the same cycle. Our results show a clear flux variability, confirming trend increasing with phase range 0.05 ≲ ϕ 0.7 as has been found XMM carried out 2005 suggest that X-ray variations are linked to changes intrinsic properties emitter, which should have implications for possible emission models explain multiwavelength knowledge source.
An extended observation campaign of the gamma-ray binary system PSR B1259-63 has been conducted with H.E.S.S. (High Energy Stereoscopic System) II 5-telescope array during system's periastron passage in 2014.We report on outcome this campaign, which consists more than 85 h data covering both pre-and post-periastron orbital phases.The lower energy threshold allows very-high-energy (VHE; E 100 GeV) emission from to be studied for first time down 200 GeV.The new dataset partly overlaps and...
The discovery of non-thermal X-ray emission from the jets some binaries, and especially GeV-TeV gamma-rays in them, provide a clear evidence very efficient acceleration particles to multi-TeV energies these systems. observations demonstrate richness phenomena compact galactic objects containing relativistic outflows or winds produced near black holes neutron stars. We review here main observational results on binaries as well proposed scenarios explain production high-energy gamma-rays.