Alessandro De Angelis
(INFN / Univ. di Udine)
20/06/2012, 09:10
Early measurements from Pacini and others
Claus Grupen
(Siegen University)
20/06/2012, 10:20
Cosmic rays after Hess is the birthplace of elementary particle physics.
The 1936 Nobel prize was shared between Victor Hess and Carl Anderson.
Anderson discovered the positron in a cloud chamber. The positron was
predicted by Dirac several years earlier, but Anderson was not aware of it.
In his subsequent cloud chamber investigations Anderson found - together
with Neddermeyer - the muon,...
Paolo Lipari
(INFN - Roma 1)
20/06/2012, 11:50
The theoretical aspects of the study of the cosmic radiation will be reviewed.
Roberto Battiston
(Univ. of Perugia and INFN)
20/06/2012, 12:25
Current experimental studies of the cosmic radiation will be reviewed
Dr
Marie-Hélène Grondin
(Max-Planck Institut für Kernphysik (MPIK) Heidelberg, Germany)
20/06/2012, 15:05
Since 2003, the continuous observations of the Galactic Plane by Atmospheric Cherenkov Telescopes, especially by H.E.S.S., have yielded the detection of more than 60 Galactic sources. Among them, Pulsar Wind Nebulae (PWNe) are the dominant class with more than 15 sources firmly identified.
In the GeV energy range, observations have been made possible through the launch of the Fermi-Large...
Dr
Gareth Hughes
(DESY Zeuthen)
20/06/2012, 15:30
We report on recent galactic results and discoveries made by the VERITAS collaboration. The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is a ground-based gamma-ray observatory, located in southern Arizona, sensitive to energies from 100GeV up to 30TeV. VERITAS has been fully operational since 2007 and its current sensitivity enables the detection of a 1% Crab Nebula flux...
Dr
Roberta Zanin
(Universitat de Barcelona)
20/06/2012, 15:55
MAGIC is a system of two atmospheric Cherenkov telescopes which explores the very-high-energy sky, from some tens of GeV up to tens of TeV. Located in the Canary island of La Palma, MAGIC has the lowest energy threshold among the instruments of its kind, well suited to study the still poorly explored energy band below 100 GeV. Although the space-borne gamma-ray telescope Fermi/LAT is sensitive...
Maxim Lyutikov Lyutikov
(Purdue University/Arcetri Observatory)
20/06/2012, 16:20
The detection of Crab pulsar by VERITAS collaboration as well as Agile and Fermi results on gamma-ray pulsars imply the dominance of the Inverse Compton scattering over the curvature radiation and signify an important shifts in our understanding of pulsar high energy emission.
Recent observations of flares in the Crab nebula call into question the prevalent model of particle acceleration...
Dr
Orlando Elena
(Stanford University/KIPAC)
20/06/2012, 17:15
Galactic cosmic rays (CR), interstellar gamma-ray emission and radio emission
are related topics. CR electrons propagate in the Galaxy and interact with
the interstellar medium, producing inverse Compton and bremsstrahlung
emission measured in gamma rays, and synchrotron emission measured in
radio. After giving an overview of the latest results with Fermi on
interstellar gamma-ray...
andrea belfiore
(UCSC-SCIPP INAF-IASF)
20/06/2012, 18:05
The Fermi Large Area Telescope (LAT) has opened a new era for pulsar astronomy. Besides improving our understanding of known pulsars and triggering the discovery of new radio pulsars, it has uncovered a whole population of radio-quiet gamma-ray pulsars. I will describe the techniques used to find such pulsars from gamma-ray data alone and review the results obtained so far with these...
Dr
vito sguera
(INAF-IASF Bologna)
20/06/2012, 18:30
In the last few years Fermi and AGILE observations have indicated the existence of a possible population of gamma-ray transients located on the galactic plane and characterized by fast flares lasting only a very few days. Notably, no blazar-like counterparts are known within their error boxes so they could represent a completely new class of galactic fast gamma-ray transients. The task of...
Dr
Giuseppe Andrea Caliandro
(CSIC)
20/06/2012, 18:55
In the last decade Cherenkov telescopes on the ground and space-based gamma-ray instruments have identified a new class of high mass X-ray binaries (HMXB), whose emission is dominated by gamma rays. To date only five of these systems are known. All of them are detected by Cherenkov telescopes in the TeV energy range, while at GeV energies there is still one (HESS J0632+057) that has no...
Dr
Roberta Sparvoli
(ROMA2)
21/06/2012, 09:00
Direct measurements of the chemical composition and fluxes of cosmic rays have
always played a crucial role in advancing our understanding of both acceleration and
propagation of cosmic rays. Direct detection is performed with three basic technologies: balloon-borne and satellite-borne detectors, and instruments placed aboard space stations.
In this talk I will present the basic principles...
UGO GIACCARI
(INFN Napoli)
21/06/2012, 09:35
Recent observations from PAMELA show that the cosmic ray proton spectrum does not follow a single power law model in the rigidity range between 1 GV to 1.2 TV. The spectrum gradually softens from 30 GV up to 230 GV but around ~240 GV the spectrum becomes harder. This observed behavior is in contradiction with the predictions of a shock diffusion acceleration model and diffusive acceleration in...
Carmelo Sgro'
(INFN-Pisa)
21/06/2012, 10:00
The Fermi Large Area Telescope (LAT) is an international observatory designed to study the high-energy gamma-ray sky. The gamma-ray events are identified and reconstructed from the signature of their electromagnetic showers in the instrument and it can therefore be used to observe cosmic-ray electrons and positrons thanks to its flexible triggering and filtering capabilities on-board. The...
Dr
Cecilia Pizzolotto
(INFN Perugia)
21/06/2012, 10:25
The Alpha Magnetic Spectrometer (AMS) is a precision particle physics magnetic spectrometer designed to measure electrons, positrons, gamma rays and various nuclei and anti-nuclei from the cosmos up to TeV energy ranges. It was delivered to the International Space Station onboard space shuttle Endeavour and installed on May 19, 2011. Since that time, more than 14 billion cosmic ray events...
Dr
Pasquale Blasi
(INAF/Osservatorio Astrofisico di Arcetri)
21/06/2012, 10:50
I will describe the current status of the understanding of the acceleration and propagation of Galactic cosmic rays and discuss some recent observational results on the spectrum, composition and anisotropy of these particles. Special attention will be devoted to successes and problems of the so-called supernova remnant paradigm for the origin of cosmic rays, in the light of the recent gamma...
Dr
Francesco De Palma
(INFN BA)
21/06/2012, 11:45
The Fermi Gamma-ray Space Telescope has shed new light on many types of Galactic objects, including Supernova Remnants (SNRs). With over 15 SNRs identified to date and over 40 candidates in the 2nd Fermi Gamma-ray LAT (2FGL) Catalog, we are beginning to have sufficient numbers to perform GeV SNR population studies and explore their connection to TeV emission. Moreover, with the wealth of...
Dr
John Hewitt
(NASA Goddard)
21/06/2012, 12:00
Long thought to be capable of supplying the high energy cosmic rays in the Galaxy, supernova remnant (SNRs) are ideal sites to study cosmic-ray acceleration. Here I present recent results from Fermi-LAT, including the detection of the SNR Puppis A. Extended gamma-ray emission from the remnant is found to match the IR and X-ray morphology. Applying knowledge of the photon field and ambient...
Andrea Giuliani
(INAF-Istituto Nazionale di Astronomia · IASF Milano)
21/06/2012, 12:15
AGILE study of Supernova Remnants
Gabrijela Zaharijas
(ICTP, Trieste)
21/06/2012, 12:40
Indirect DM searches through Gamma rays produced in DM annihilation/decay in the Milky Way halo are promising means to test the WIMP paradigm due to the high DM density in the inner Galaxy and proximity of the target. Propagation of Galactic cosmic rays also produces diffuse gamma rays which represent a major foreground for these searches. In this talk we report results of an analysis in which...
Ms
Maja Llena Garde
(Oskar Klein Centre, Stockholm University)
21/06/2012, 15:15
Dwarf spheroidal galaxies are considered very promising targets for dark matter searches in the gamma-ray band due to their large mass-to-light ratio and low astrophysical background. The gamma-ray signal is expected to be very faint, but a combined analysis of a set of dwarf galaxies improves the Fermi-LAT sensitivity to gamma-ray sources and yields enhanced constraints on the dark matter...
Dr
Eugenio Bottacini
(Stanford University)
21/06/2012, 15:40
In the view of the so-called Active Galactic Nuclei (AGN) unified model
the nuclear activity is powered by a super-massive black hole (SMBH)
at the center of the AGN. An optically thick gas-dust structure surrounding
the SMBH absorbs efficiently the nuclear radiation.
Current surveys of the INTEGRAL Soft-Gamma Ray Imager (IBIS/ISGRI) and of the
Burst Alert Telescope (BAT) on board the...
Silvia Vernetto
(INAF Torino and INFN)
21/06/2012, 16:05
ARGO-YBJ is an extensive air shower detector located in Tibet at 4300 m a.s.l.
The detector features and location allow the study of gamma-ray sources with a few hundreds GeV energy threshold and very large duty cycle.
Results so fare obtained will be reviewed.
Andrea Chiavassa
(Univ. of Torino and INFN)
22/06/2012, 09:00
In this talk I will review the main results obtained by ground based experiments detecting the extensive air showers generated in atmosphere by the interaction of primary cosmic rays.
I will show the latest results about the anisotropy, the primary spectrum and the chemical composition in the energetic range 10^12-10^20 eV. As the energetic interval is huge experiments operate at different...
Michele Iacovacci
(Universita' di Napoli and INFN)
22/06/2012, 09:40
The results so far obtained by the ARGO-YBJ experiment in the study of the cosmic ray flux will be discussed together with the prospects for future achievements.
Mariangela Settimo
(University of Siegen)
22/06/2012, 10:05
The Pierre Auger Observatory, located near Malargue, in the Province of Mendoza, Argentina, was designed and optimized to investigate the origin and the nature of ultra high energy cosmic rays, above 10^18 eV, using a hybrid detection technique. The surface array and the fluorescence detector provide complementary measurements of the extensive air showers. It has been taking data stably since...
Prof.
Daniele Fargion
(ROMA1)
22/06/2012, 10:30
The TeV gamma anisotropy in ARGO,MILAGRO and ICECUBE is one of the novel surprising discover of the decade. The TeVs or hundred TeV nucleons or nuclei cannot trace far their original sources because of the severe smearing by galactic fields. Gamma sources (AGN) cannot shine much far because IR-TeV photo opacity and their image might be a point source and not wide spread sky area. Galactic...
Dr
Roberto Aloisio
(INAF - Osservatorio Astrofisico Arcetri)
22/06/2012, 11:20
A general review on the propagation of Ultra High Energy Cosmic Rays (UHECR) in astrophysical backgrounds will be presented, with particular emphasis on the comparison among theoretical models and recent observations by the Pierre Auger Observatory. In particular, the observed spectrum and chemical composition of UHECR will be discussed in connection with the theoretical aspects of the...
Prof.
Vincenzo Flaminio
(PI)
22/06/2012, 11:45
More than one hundred years after the first observations of cosmic rays, and in spite of the impressive amount of data that have in the meantime been collected, many of the problems connected with their origin and propagation remain unsolved.
It is a common, but poorly supported, belief that they must originate from catastrophic events which take place in our as well as in other Galaxies....
Dr
Juan Antonio Aguilar Sanchez
(University of Geneva)
22/06/2012, 12:10
The IceCube Neutrino Observatory is a kilometer‐scale detector located in the South
Pole. The full detector comprises 5,160 photomultipliers deployed along 86
strings at depths between 1.5‐2.5 km in the ice. Muon tracks arriving in the detector from neutrino interactions are reconstructed using the time and charge information detected by the array of PMTs. In this contribution we present the...
Dr
Emiliano Mocchiutti
(TS)
22/06/2012, 14:35
The present design of the new space gamma-ray telescope GAMMA-400
for the energy range 50 MeV - 3 TeV is presented. The proposed
instrument has an angular resolution of 1-2 degrees at E(gamma) ~100 MeV
and ~0.01 degrees at E(gamma) > 100 GeV and an energy resolution ~1% at
E(gamma) > 100 GeV. By the mean of a deep segmented calorimeter high energy electrons flux can be studied, with a...
Nicola SARTORE
(INAF - Milano)
22/06/2012, 15:25
ASTRI is a flagship project of the italian Ministry of Instruction, University and Research and represents the italian proposal for the development of the Small Scale Telescope (SST) system of the Cherenkov Telescope Array (CTA), which is the planned next generation observatory for very high energy gamma-rays (20 GeV - 100 TeV).
The ASTRI (Astrofisica a Specchi con Tecnologia Replicante...
Dr
Brian Baughman
(University of Maryland, College Park)
22/06/2012, 15:40
The High Altitude Water Cherenkov Observatory (HAWC) is currently being deployed on the slopes of Volcan Sierra Negra, Puebla, Mexico. The HAWC observatory will consist of 300 Water Cherenkov Detectors totaling approximately 22,000 m^2 of instrumented area. The water Cherenkov technique allows HAWC to have a nearly 100\% duty cycle and large field of view, making the HAWC observatory an ideal...
Dr
Mario Edoardo Bertaina
(INFN Torino)
22/06/2012, 16:30
JEM-EUSO will be the first observatory to explore from space the
universe at ultra-high energies. Hosted on the JEM platform on board the
ISS, it will use an innovative refractive optics and sophisticated focal
surface to observe the UV fluorescence light emitted, in the 320-400 nm
band, by extensive air showers generated by primary particles interacting
in the atmosphere. The telescope...
Dr
Domenico Impiombato
(Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo)
ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana), a flagship project of the Italian Ministry of Education, University and Research, is a prototype for the
small-size telescopes of the Cherenkov Telescope Array (CTA).
ASTRI will adopt a wide field optical system in a Schwarzschild-Couder
configuration to explore the VHE range (1-100 TeV) of the electromagnetic spectrum....
Dr
Volodymyr Kryvdyk
(Taras Shevchenko National University of Kyiv)
The generation of the particles, photons and neutrino in the magnetosphere of collapsing stars is considered. The initial magnetospheres of collapsing star consist with protons and electrons. These particles accelerate during collapse to relativistic energy. Interacting among themselves and the magnetic fields in magnetosphere, these particles will lose their energy on the ionization and...
Maxim Lyutikov Lyutikov
(Purdue University/Arcetri Observatory)
Relativistic outflows carrying large scale magnetic fields have large
inductive potential and may accelerate protons to ultra high energies.
We discuss a novel scheme of Ultra-High Energy Cosmic
Ray acceleration due to drifts in
magnetized, cylindrically collimated, sheared jets of powerful active galaxies.
We point out that a
positively charged particle carried by such a flow...
Dr
Mariangela Settimo
(University of Siegen, Germany)
Ultra high energy photons, above 10^17-10^18 eV, may interact with the extragalactic background radiation leading to the development of electromagnetic cascades. A Monte Carlo code (ELECA) to simulate the electromagnetic cascades initiated by high-energy photons and electrons is presented. The main interaction processes (Pair Productions, Inverse Compton Scattering and Triple Pair Production)...
Dr
Orlando Elena
(Stanford University/KIPAC)
The importance of inverse-Compton emission from interactions of cosmic-ray
electrons and positrons on the photon field of the Sun (and also individual stars)
was first realized around 2006.
Following the discovery of solar emission from the quiet sun in EGRET
data, now Fermi-LAT is so sensitive that even such weak emission can be
detected with high significance and studied in detail....
