Search results for: D. Sobczynska

Items from 1 to 20 out of 28 results

article

Performance of the MAGIC telescopes under moonlight

M.L. Ahnen, S. Ansoldi, L.A. Antonelli, C. Arcaro, more

Astroparticle Physics > 2017 > 94 > C > 29-41

MAGIC, a system of two imaging atmospheric Cherenkov telescopes, achieves its best performance under dark conditions, i.e. in absence of moonlight or twilight. Since operating the telescopes only during dark time would severely limit the duty cycle, observations are also performed when the Moon is present in the sky. Here we develop a dedicated Moon-adapted analysis to characterize the performance...

article

The major upgrade of the MAGIC telescopes, Part I: The hardware improvements and the commissioning of the system

J. Aleksić, S. Ansoldi, L.A. Antonelli, P. Antoranz, more

Astroparticle Physics > 2016 > 72 > C > 61-75

The MAGIC telescopes are two Imaging Atmospheric Cherenkov Telescopes (IACTs) located on the Canary island of La Palma. The telescopes are designed to measure Cherenkov light from air showers initiated by gamma rays in the energy regime from around 50GeV to more than 50TeV. The two telescopes were built in 2004 and 2009, respectively, with different cameras, triggers and readout systems. In the years...

article

The major upgrade of the MAGIC telescopes, Part II: A performance study using observations of the Crab Nebula

J. Aleksić, S. Ansoldi, L.A. Antonelli, P. Antoranz, more

Astroparticle Physics > 2016 > 72 > C > 76-94

MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes located in the Canary island of La Palma, Spain. During summer 2011 and 2012 it underwent a series of upgrades, involving the exchange of the MAGIC-I camera and its trigger system, as well as the upgrade of the readout system of both telescopes. We use observations of the Crab Nebula taken at low and medium zenith angles to assess the...

article

Monte Carlo simulations of alternative sky observation modes with the Cherenkov Telescope Array

M. Szanecki, D. Sobczyńska, A. Niedźwiecki, J. Sitarek, more

Astroparticle Physics > 2015 > 67 > Complete > 33-46

We investigate possible sky survey modes with the Middle Sized Telescopes (MST, aimed at covering the energy range from ∼100GeV to 10TeV) subsystem of the Cherenkov Telescope Array (CTA). We use the standard CTA tools, CORSIKA and sim_telarray, to simulate the development of gamma-ray showers, proton background and the telescope response. We perform simulations for the H.E.S.S.-site in Namibia, which...

article

Influence of the geomagnetic field on the IACT detection technique for possible sites of CTA observatories

M. Szanecki, K. Bernlöhr, D. Sobczyńska, A. Niedźwiecki, more

Astroparticle Physics > 2013 > 45 > Complete > 1-12

We investigate the influence of the geomagnetic field (GF) on the Imaging Air Cherenkov Telescope technique for two northern (Tenerife and San Pedro Martir) and three southern (Salta, Leoncito and Namibia (the H.E.S.S.-site)) site candidates for Cherenkov Telescope Array (CTA) observatories. We use the CORSIKA and sim_telarray programs for Monte Carlo simulations of gamma ray showers, hadronic background...

article

Introducing the CTA concept

B.S. Acharya, M. Actis, T. Aghajani, G. Agnetta, more

Astroparticle Physics > 2013 > 43 > Complete > 3-18

The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span about four decades of energy, from a few tens of GeV to above 100TeV with enhanced angular and energy resolutions over existing VHE gamma-ray observatories...

article

Performance of the MAGIC stereo system obtained with Crab Nebula data

J. Aleksić, E.A. Alvarez, L.A. Antonelli, P. Antoranz, more

Astroparticle Physics > 2012 > 35 > 7 > 435-448

MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes located in the Canary island of La Palma. Since autumn 2009 both telescopes have been working together in stereoscopic mode, providing a significant improvement with respect to the previous single-telescope observations. We use observations of the Crab Nebula taken at low zenith angles to assess the performance of the MAGIC stereo system...

article

Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy

The CTA Consortium, M. Actis, G. Agnetta, F. Aharonian, more

Experimental Astronomy > 2011 > 32 > 3 > 193-316

Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. Ground-based gamma-ray astronomy has a huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build the next generation instrument, with a factor of 5–10 improvement in sensitivity in the 100 GeV–10...

article

Improving the performance of the single-dish Cherenkov telescope MAGIC through the use of signal timing

E. Aliu, H. Anderhub, L.A. Antonelli, P. Antoranz, more

Astroparticle Physics > 2009 > 30 > 6 > 293-305

The Cherenkov light flashes produced by extensive air showers are very short in time. A high bandwidth and fast digitizing readout, therefore, can minimize the influence of the background from the light of the night sky, and improve the performance in Cherenkov telescopes. The time structure of the Cherenkov image can further be used in single-dish Cherenkov telescopes as an additional parameter to...

article

Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope

J. Albert, E. Aliu, H. Anderhub, L.A. Antonelli, more

Physics Letters B > 2008 > 668 > 4 > 253-257

We analyze the timing of photons observed by the MAGIC telescope during a flare of the active galactic nucleus Mkn 501 for a possible correlation with energy, as suggested by some models of quantum gravity (QG), which predict a vacuum refractive index ≃1+(E/MQGn)n, n=1,2. Parametrizing the delay between γ-rays of different energies as Δt=±τlE or Δt=±τqE2, we find τl=(0.030±0.012) s/GeV at the 2.5-σ...

article

Monte Carlo studies of geomagnetic field effects on the imaging air Cherenkov technique for the MAGIC telescope site

S.C. Commichau, A. Biland, J.L. Contreras, R. de los Reyes, more

Nuclear Inst. and Methods in Physics Research, A > 2008 > 595 > 3 > 572-586

Imaging air Cherenkov telescopes (IACTs) detect the Cherenkov light from extensive air showers (EAS) initiated by very high energy (VHE) γ-rays impinging on the Earth's atmosphere. Due to the overwhelming background from hadron-induced EAS, the discrimination of the rare γ-like events is vital. The influence of the geomagnetic field (GF) on the development of EAS can further complicate the imaging...

article

FADC signal reconstruction for the MAGIC telescope

J. Albert, E. Aliu, H. Anderhub, P. Antoranz, more

Nuclear Inst. and Methods in Physics Research, A > 2008 > 594 > 3 > 407-419

Until April 2007 the Major Atmospheric Gamma ray Imaging Cherenkov (MAGIC) telescope used a 300MSamples/s flash analog-to-digital converter (FADC) system to sample the shaped photomultiplier tube (PMT) signals produced by the captured Cherenkov photons of air showers. Different algorithms to reconstruct the signal from the read-out samples (extractors) have been implemented and are described and compared...

article

Implementation of the Random Forest method for the Imaging Atmospheric Cherenkov Telescope MAGIC

J. Albert, E. Aliu, H. Anderhub, P. Antoranz, more

Nuclear Inst. and Methods in Physics Research, A > 2008 > 588 > 3 > 424-432

The paper describes an application of the tree classification method Random Forest (RF), as used in the analysis of data from the ground-based gamma telescope MAGIC. In such telescopes, cosmic gamma-rays are observed and have to be discriminated against a dominating background of hadronic cosmic-ray particles. We describe the application of RF for this gamma/hadron separation. The RF method often...

article

Unfolding of differential energy spectra in the MAGIC experiment

J. Albert, E. Aliu, H. Anderhub, P. Antoranz, more

Nuclear Inst. and Methods in Physics Research, A > 2007 > 583 > 2-3 > 494-506

The paper describes the different methods, used in the MAGIC experiment, to unfold experimental energy distributions of cosmic ray particles (γ-rays). Questions and problems related to the unfolding are discussed. Various procedures are proposed which can help to make the unfolding robust and reliable. The different methods and procedures are implemented in the MAGIC software and are used in most...

article

An Artist and a Scientist; or What Each Says about Color

D. Sobczynska

Przeglad Filozoficzny - Nowa Seria (Philosophical Review - New Series) > 2007 > 16 > 3(63) > 231-245

The paper is a specific enrichment of Krajewski's scientific philosophy. According to Krajewski, scientific philosophy embraces scientific fundamentals of philosophy, philosophy of science, scientific metaphysics (ie. ontology), as well as opinions concerning science goals and values relevant for science. However, scientific philosophy does not embrace esthetical issues. The papers postulates an addition...

article

Tagging single muons and other long-flying relativistic charged particles by ultra-fast timing in air Cherenkov telescopes

R. Mirzoyan, D. Sobczynska, E. Lorenz, M. Teshima

Astroparticle Physics > 2006 > 25 > 5 > 342-348

Atmospheric air Cherenkov telescopes are successfully used for ground-based, very high-energy (VHE) γ ray astronomy. Triggers from the so-called single muon and other long-flying relativistic charged particle events are an unwanted background for the Cherenkov telescope. Because of low rate at ∼TeV energies the muon background is unimportant. It is much more intense for telescopes with high photon...

article

Physics and astrophysics with a ground-based gamma-ray telescope of low energy threshold

J. Albert i Fort, A. Armada, C. Baixeras, H. Bartko, more

Astroparticle Physics > 2005 > 23 > 5 > 493-509

Ground-based Cherenkov telescopes have made in recent years important contributions to high energy gamma-ray astronomy. A lower energy threshold, considerably below 100GeV, and improved sensitivity will be key parameters to extend their role. A lower threshold will permit these instruments to cover wavelengths with good overlap with satellite experiments, thus providing essential complementary information...

article

The Wilhelm Ostwald's School of Physical Chemistry

D. Sobczynska

Zagadnienia Naukoznawstwa > 2005 > 3-4 > 429-446

The article is devoted to activity of Wilhelm Ostwald (1853 - 1932) as the creator and then, in a period 1887-1906, the leader of the famous school of physical chemistry in Leipzig. The phenomenon of the extraordinary scientific energy of the school has been evaluated from two different viewpoint: L. Fleck's philosophy of science and concept of Polish sociological schools of J. Gockowski and J. Szacki...

article

Commissioning and first tests of the MAGIC telescope

C. Baixeras, D. Bastieri, C. Bigongiari, O. Blanch, more

Nuclear Inst. and Methods in Physics Research, A > 2004 > 518 > 1-2 > 188-192

Major Atmospheric Gamma Imaging Cherenkov telescope is starting its operations with a set of engineering runs to tune the telescope subsystem elements to be ready for the first physics campaign. Many technical improvements have been developed and implemented in several elements of the telescope to reach the lowest energy threshold ever obtained by an Imaging Atmospheric Cherenkov Telescope. A general...

article

Metale ciężkie w odpadach opakowaniowych

D. Sobczyńska, T. Sobczyński, A. Kowalski

Ekologia i Technika > 2004 > R. 12, nr 4 > 109-112

Ustawowy obowiązek zagospodarowywania odpadów opakowaniowych na drodze recyklingu i odzysku stworzył konieczność badania ich pod kątem zawartości metali ciężkich. W krajach Unii Europejskiej już od 1996 r. obowiązywały normatywy określające maksymalną sumaryczną ich zawartość. W Polsce problem ten został zasygnalizowany w ustawie "o opakowaniach i odpadach opakowaniowych" z 2001 r. Jednak...

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Search results for: D. Sobczynska

Performance of the MAGIC telescopes under moonlight

The major upgrade of the MAGIC telescopes, Part I: The hardware improvements and the commissioning of the system

The major upgrade of the MAGIC telescopes, Part II: A performance study using observations of the Crab Nebula

Monte Carlo simulations of alternative sky observation modes with the Cherenkov Telescope Array

Influence of the geomagnetic field on the IACT detection technique for possible sites of CTA observatories

Introducing the CTA concept

Performance of the MAGIC stereo system obtained with Crab Nebula data

Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy

Improving the performance of the single-dish Cherenkov telescope MAGIC through the use of signal timing

Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope

Monte Carlo studies of geomagnetic field effects on the imaging air Cherenkov technique for the MAGIC telescope site

FADC signal reconstruction for the MAGIC telescope

Implementation of the Random Forest method for the Imaging Atmospheric Cherenkov Telescope MAGIC

Unfolding of differential energy spectra in the MAGIC experiment

An Artist and a Scientist; or What Each Says about Color

Tagging single muons and other long-flying relativistic charged particles by ultra-fast timing in air Cherenkov telescopes

Physics and astrophysics with a ground-based gamma-ray telescope of low energy threshold

The Wilhelm Ostwald's School of Physical Chemistry

Commissioning and first tests of the MAGIC telescope

Metale ciężkie w odpadach opakowaniowych

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