Publications (43)
Towards a Provenance Management System for Astronomical Observatories
Mathieu Servillat, François Bonnarel, Catherine Boisson +3
We present here a provenance management system adapted to astronomical projects needs. We collected use cases from various astronomy projects and defined a data model in the ecosys…
Open high-level data formats and software for gamma-ray astronomy
Christoph Deil, Catherine Boisson, Karl Kosack +22
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 for grou…
High energy blazars spectroscopy with X-Shooter on the VLT
Santiago Pita, Paolo Goldoni, Catherine Boisson +4
We present results of observations in the UV to near-IR range for eight blazars, three of which have been recently discovered at Very High Energies (VHE) and five appearing as inte…
A synchrotron self-Compton scenario for the very high energy gamma-ray emission of the radiogalaxy M87
Jean-Philippe Lenain, Catherine Boisson, Hélène Sol +1
M87 is the first extragalactic source detected in the TeV range that is not a blazar. With the increasing performances of ground-based Cherenkov telescopes, we can now probe the va…
Gammapy: high level data analysis for extragalactic science cases with the Cherenkov Telescope Array
Julien Lefaucheur, Catherine Boisson, Zeljka Bosnjak +5
The Cherenkov Telescope Array (CTA) observatory will probe the non-thermal universe above 20 GeV up to several hundreds of TeV with a significant improvement in sensitivity and ang…
Gammapy: A Python package for gamma-ray astronomy
Axel Donath, Régis Terrier, Quentin Remy +42
In this article, we present Gammapy, an open-source Python package for the analysis of astronomical -ray data, and illustrate the functionalities of its first long-term-support…
FAIR solutions for a science platform to analyse Cherenkov data online
Mathieu Servillat, Paula Kornecki, Catherine Boisson
We developed a system to run quick analyses of Cherenkov data in compliance with the FAIR Guiding Principles for scientific data management (FAIR: Findable, Accessible, Interoperab…
Observer Access to the Cherenkov Telescope Array
Jürgen Knödlseder, Volker Beckmann, Catherine Boisson +5
The Cherenkov Telescope Array (CTA), a ground-based facility for very-high-energy (VHE) gamma-ray astronomy, will operate as an open observatory, serving a wide scientific communit…
Structuring metadata for the Cherenkov Telescope Array
Mathieu Servillat, Catherine Boisson, Julien Lefaucheur +3
The landscape of ground-based gamma-ray astronomy is drastically changing with the perspective of the Cherenkov Telescope Array (CTA) composed of more than 100 Cherenkov telescopes…
The buried Balmer-edge signatures from quasars
Makoto Kishimoto, Robert Antonucci, Catherine Boisson +1
In our previous paper, we have reported the detection of a Balmer edge absorption feature in the polarized flux of one quasar (Ton 202). We have now found similar Balmer edge featu…
IVOA Provenance data model: hints from the CTA Provenance prototype
Michèle Sanguillon, Mathieu Servillat, Mireille Louys +3
We present the last developments on the IVOA Provenance data model, mainly based on the W3C PROV concept. In the context of the Cherenkov astronomy, the data processing stages impl…
AGN accretion disks as spatially resolved by polarimetry
Makoto Kishimoto, Robert Antonucci, Omer Blaes +4
A crucial difficulty in understanding the nature of the putative accretion disk in AGNs is that some of its key intrinsic spectral signatures cannot be observed directly. The stron…
ExHaLe-jet: Modeling blazar jets with an extended hadro-leptonic radiation code
Michael Zacharias, Anita Reimer, Catherine Boisson +1
Blazars emit across all electromagnetic wavelengths. While the so-called one-zone model has described well both quiescent and flaring states, it cannot explain the radio emission a…
Revealing AGN by Polarimetry
Makoto Kishimoto, Robert Antonucci, Catherine Boisson +1
Polarimetric study in the UV and optical has been one of the keys to reveal the structure and nature of active galactic nuclei (AGN). Combined with the HST's high spatial resolutio…
Gammapy - A prototype for the CTA science tools
Christoph Deil, Roberta Zanin, Julien Lefaucheur +27
Gammapy is a Python package for high-level gamma-ray data analysis built on Numpy, Scipy and Astropy. It enables us to analyze gamma-ray data and to create sky images, spectra and…
An innovative blazar classification based on radio jet kinematics
Olivier Hervet, Catherine Boisson, Hélène Sol
Blazars are usually classified following their synchrotron peak frequency ( scale) as high, intermediate, low frequency peaked BL Lacs (HBLs, IBLs, LBLs), and flat spectru…
Hot Very Small dust Grains in NGC 1068 seen in jet induced structures thanks to VLT/NACO adaptive optics
Daniel Rouan, Francois Lacombe, Eric Gendron +12
We present K, L and M diffraction-limited images of NGC 1068 obtained with NAOS+CONICA at VLT/YEPUN over a 3.5" field around the central engine. Hot dust (Tcol = 550-650 K) is foun…
Integrating the VO Framework in the EOSC
Marco Molinaro, Mark Allen, Sara Bertocco +9
The European Open Science Cloud (EOSC) is in its early stages, but already some aspects of the EOSC vision are starting to become reality, for example the EOSC portal and the devel…
A mixed lepto-hadronic scenario for PKS 2155-304
Matteo Cerruti, Andreas Zech, Catherine Boisson +1
The models developed to describe the spectral energy distribution (SED) of blazars can be divided into leptonic or hadronic scenarios, according to the particles responsible for th…
Particle acceleration signatures in the time-dependent one-zone synchrotron self-Compton model of blazar flares
Paloma Thevenet, Andreas Zech, Catherine Boisson +1
The study of multiwavelength flux and spectral variations during rapid flares from blazars provides strong constraints on the physical parameters of the compact emission regions re…
Accretion around supermassive black holes: the detection of the Balmer edge signature from quasars
Makoto Kishimoto, Robert Antonucci, Catherine Boisson +1
The ultraviolet/optical continuum of quasars is thought to be from an accretion flow around a supermassive black hole, and it dominates the radiative output of quasars. However, th…
FAIR high level data for Cherenkov astronomy
Mathieu Servillat, Catherine Boisson, Matthias Fuessling +1
We highlight here several solutions developed to make high-level Cherenkov data FAIR: Findable, Accessible, Interoperable and Reusable. The first three FAIR principles may be ensur…
A first look at galaxies with the DENIS survey
Gary Mamon, Vincent Banchet, Catherine Boisson +2
We review the various steps for the extraction of extended sources, principally galaxies, from the DENIS images. The capabilities of DENIS are studied with simulated images. A few…
The Virtual Observatory Ecosystem Facing the European Open Science Cloud
Marco Molinaro, Mark Allen, Françoise Genova +9
The International Virtual Observatory Alliance (IVOA) has developed and built, in the last two decades, an ecosystem of distributed resources, interoperable and based upon open sha…
Equipartition Gamma-Ray Blazars and the Location of the Gamma-Ray Emission Site in 3C 279
Charles D. Dermer, Matteo Cerruti, Benoit Lott +2
Blazar spectral models generally have numerous unconstrained parameters, leading to ambiguous values for physical properties like Doppler factor delta or fluid magnetic field B'. T…
The relativistic jet of the -ray emitting narrow-line Seyfert 1 galaxy PKS J12220413
Daniel Kynoch, Hermine Landt, Martin J. Ward +5
We present a multi-frequency study of PKS J12220413 (4C04.42), currently the highest redshift -ray emitting narrow-line Seyfert 1 (-NLS1). We assemble a broad spectra…
Modelling the variable emission states of -ray emitting Narrow-Line Seyfert 1 galaxies
Anna Luashvili, Catherine Boisson, Andreas Zech +2
-ray-emitting narrow-line Seyfert 1 galaxies (-NLS1) constitute an intriguing small population of Active Galactic Nuclei with -ray emission resembling low power flat-sp…
The relativistic jet of the gamma-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
Daniel Kynoch, Hermine Landt, Martin J. Ward +7
The detection of several radio-loud narrow-line Seyfert 1 (NLS1) galaxies by the Fermi Gamma-Ray Space Telescope hints at the existence of a rare, new class of gamma-ray emitting a…
High-energy and Very High-energy Constraints from Log-parabolic Spectral Models in Narrow-line Seyfert 1 Galaxies
Stefano Vercellone, Luigi Foschini, Patrizia Romano +20
Narrow-line Seyfert 1 galaxies (NLSy1s) are a well-established class of -ray sources, showing the presence of a jet like the more common flat-spectrum radio quasars. The eviden…
The On-Site Analysis of the Cherenkov Telescope Array
Andrea Bulgarelli, Valentina Fioretti, Andrea Zoli +54
The Cherenkov Telescope Array (CTA) observatory will be one of the largest ground-based very high-energy gamma-ray observatories. The On-Site Analysis will be the first CTA scienti…
Stellar populations from H-band VLT spectroscopy in a sample of seven active galaxies
Isabel Marquez, Catherine Boisson, Monique Joly +2
The relationship between an active galactic nucleus (AGN) and its host galaxy is still far from being understood. Properties of the host galaxies of Seyfert nuclei, such as luminos…
Constraining the parameter space of the one-zone synchrotron-self-Compton model for GeV-TeV detected BL Lac objects
Matteo Cerruti, Catherine Boisson, Andreas Zech
The one-zone synchrotron-self-Compton (SSC) model aims to describe the spectral energy distribution (SED) of BL Lac objects via synchrotron emission by a non-thermal population of…
SSC scenario for VHE emission from 2 radiogalaxies: M 87 and Cen A
Jean-Philippe Lenain, Catherine Boisson, Hélène Sol
M 87 is the first extragalactic source detected in the Very High Energy (VHE; E > 100 GeV) gamma-ray domain that is not a blazar, its large scale jet not being aligned to the line…
Gamma-ray blazars near equipartition and the origin of the GeV spectral break in 3C 454.3
Matteo Cerruti, Charles D. Dermer, Benoit Lott +2
Observations performed with the Fermi-LAT telescope have revealed the presence of a spectral break in the GeV spectrum of flat-spectrum radio quasars (FSRQs) and other low- and int…
The characteristic blue spectra of accretion disks in quasars as uncovered in the infrared
Makoto Kishimoto, Robert Antonucci, Omer Blaes +4
Quasars are thought to be powered by supermassive black holes accreting surrounding gas. Central to this picture is a putative accretion disk which is believed to be the source of…
ExHaLe-jet: An extended hadro-leptonic jet model for blazars. I. Code description and initial results
Michael Zacharias, Anita Reimer, Catherine Boisson +1
The processes operating in blazar jets are still an open question. Modeling the radiation emanating from an extended part of the jet allows one to capture these processes on all sc…
Provenance as a requirement for large-scale complex astronomical instruments
Mathieu Servillat, Catherine Boisson, Julien Lefaucheur +4
We developed several pieces of software to enable the tracking of provenance information for the large-scale complex astronomical observatory CTA, the Cherenkov Telescope Array. Su…
Lepto-hadronic modelling of blazar emission
Matteo Cerruti, Andreas Zech, Catherine Boisson +1
The characteristic double-bumped spectral energy distribution (SED) of blazars is explained by either leptonic or hadronic models. In the former, Inverse Compton emission dominates…
Redshift determination of blazars for the Cherenkov Telescope Array
Eli Kasai, Paolo Goldoni, Santiago Pita +5
Blazars are the most numerous type of observed high-energy gamma-ray emitters. However, their emission mechanisms and population properties are still not well-understood. Crucial t…
Chasing Gravitational Waves with the Cherenkov Telescope Array
Jarred Gershon Green, Alessandro Carosi, Lara Nava +563
The detection of gravitational waves from a binary neutron star merger by Advanced LIGO and Advanced Virgo (GW170817), along with the discovery of the electromagnetic counterparts…
Spectroscopy of High Energy BL Lac Objects with X-shooter on the VLT
Santiago Pita, Paolo Goldoni, Catherine Boisson +6
Context. The study of BL Lac objects (BLL) detected in gamma-rays gives insights on the acceleration mechanisms in play in such systems and is also a valuable tool to constrain the…
The VO: A powerful tool for global astronomy
Christophe Arviset, Mark Allen, Alessandra Aloisi +14
Since its inception in the early 2000, the Virtual Observatory (VO), developed as a collaboration of many national and international projects, has become a major factor in the disc…
Looking for infrared counterparts of Fermi/LAT blazar candidates
Julien Lefaucheur, Catherine Boisson, Paolo Goldoni +1
The Fermi/LAT telescope is an efficient blazar-detector in the MeV/GeV range. More than 1100 (900) blazars detected above 100 MeV (10 GeV) are clearly associated to BL Lacertae or…