1,074 research outputs found
Time-dependent modeling of TeV-detected, young pulsar wind nebulae
The increasing sensitivity of instruments at X-ray and TeV energies have
revealed a large number of nebulae associated with bright pulsars. Despite this
large data set, the observed pulsar wind nebulae (PWNe) do not show a uniform
behavior and the main parameters driving features like luminosity,
magnetization, and others are still not fully understood. To evaluate the
possible existence of common evolutive trends and to link the characteristics
of the nebula emission with those of the powering pulsar, we selected a sub-set
of 10 TeV detections which are likely ascribed to young PWNe and model the
spectral energy distribution with a time-dependent description of the nebulae's
electron population. In 9 of these cases, a detailed PWNe model, using
up-to-date multiwavelength information, is presented. The best-fit parameters
of these nebula are discussed, together with the pulsar characteristics. We
conclude that TeV PWNe are particle-dominated objects with large
multiplicities, in general far from magnetic equipartition, and that relatively
large photon field enhancements are required to explain the high level of
Comptonized photons observed. We do not find significant correlations between
the efficiencies of emission at different frequencies and the magnetization.
The injection parameters do not appear to be particularly correlated with the
pulsar properties either. We find that a normalized comparison of the SEDs
(e.g., with the corresponding spin-down flux) at the same age significantly
reduces the spectral distributions dispersion.Comment: 38 pages, 20 figures, 8 tables. Accepted for publication in the
Journal of High Energy Astrophysics (JHEAp
Gamma-ray upper limits on magnetars with 6 years of Fermi-LAT observations
We report on the search for gamma-ray emission from 20 magnetars using 6
years of Fermi, Large Area Telescope (LAT) observations. No significant
evidence for gamma-ray emission from any of the currently-known magnetars is
found. We derived the most stringent upper limits to date on the 0.1--10 GeV
emission of Galactic magnetars, which are estimated between
erg s cm. Gamma-ray pulsations were
searched for the four magnetars having reliable ephemerides over the observing
period, but none were detected. On the other hand, we also studied the
gamma-ray morphology and spectra of seven Supernova Remnants associated or
adjacent to the magnetars.Comment: 22 pages, 4 figures, 2 tables, submitted to Ap
The effects of magnetic field, age, and intrinsic luminosity on Crab-like pulsar wind nebulae
We investigate the time-dependent behavior of Crab-like pulsar wind nebulae
(PWNe) generating a set of models using 4 different initial spin-down
luminosities (), 8 values
of magnetic fraction ( 0.001, 0.01, 0.03, 0.1, 0.5, 0.9, 0.99, and
0.999, i.e., from fully particle dominated to fully magnetically dominated
nebulae), and 3 distinctive ages: 940, 3000, and 9000 years. We find that the
self-synchrotron Compton (SSC) contribution is irrelevant for =0.1, 1,
and 10% of the Crab power, disregarding the age and the magnetic fraction. SSC
only becomes relevant for highly energetic ( of the Crab), particle
dominated nebulae at low ages (of less than a few kyr), located in a FIR
background with relatively low energy density. Since no pulsar other than Crab
is known to have these features, these results clarify why the Crab Nebula, and
only it, is SSC dominated. No young PWN would be detectable at TeV energies if
the pulsar's spin-down power is 0.1% Crab or lower. For 1% of the Crab
spin-down, only particle dominated nebulae can be detected by H.E.S.S.-like
telescopes when young enough (with details depending on the precise injection
and environmental parameters). Above 10% of the Crab's power, all PWNe are
detectable by H.E.S.S.-like telescopes if they are particle dominated, no
matter the age. The impact of the magnetic fraction on the final SED is varied
and important, generating order of magnitude variations in the luminosity
output for systems that are otherwise the same (equal , , injection,
and environment).Comment: Accepted for publication in MNRA
Is there room for highly magnetized pulsar wind nebulae among those non-detected at TeV?
We make a time-dependent characterization of pulsar wind nebulae (PWNe)
surrounding some of the highest spin-down pulsars that have not yet been
detected at TeV. Our aim is assessing their possible level of magnetization. We
analyze the nebulae driven by J2022+3842 in G76.9+1.0, J0540-6919 in N158A (the
Crab twin), J1400--6325 in G310.6--1.6, and J1124--5916 in G292.0+0.18, none of
which have been found at TeV energies. For comparison we refer to published
models of G54.1+0.3, the Crab nebula, and develop a model for N157B in the
Large Magellanic Cloud (LMC). We conclude that further observations of N158A
could lead to its detection at VHE. According to our model, a FIR energy
density of 5 eV cm could already lead to a detection in H.E.S.S.
(assuming no other IC target field) within 50 hours of exposure and just the
CMB inverse Compton contribution would produce VHE photons at the CTA
sensitivity. We also propose models for G76.9+1.0, G310.6--1.6 and G292.0+1.8
which suggest their TeV detection in a moderate exposure for the latter two
with the current generation of Cherenkov telescopes. We analyze the possibility
that these PWNe are highly magnetized, where the low number of particles
explains the residual detection in X-rays and their lack of detection at TeV
energies.Comment: Accepted for publication in MNRA
Gamma-ray emission from PSR J0007+7303 using 7 years of Fermi Large Area Telescope observations
Based on more than seven years of Fermi Large Area Telescope (LAT) Pass 8
data, we report on a detailed analysis of the bright gamma-ray pulsar (PSR)
J0007+7303. We confirm that PSR J0007+7303 is significantly detected as a point
source also during the off-peak phases with a TS value of 262 ( 16
). In the description of PSR J0007+7303 off-peak spectrum, a power law
with an exponential cutoff at 2.71.21.3 GeV (the first/second
uncertainties correspond to statistical/systematic errors) is preferred over a
single power law at a level of 3.5 . The possible existence of a cutoff
hints at a magnetospheric origin of the emission. In addition, no extended
gamma-ray emission is detected compatible with either the supernova remnant
(CTA 1) or the very high energy (> 100 GeV) pulsar wind nebula. A flux upper
limit of 6.510 erg cm s in the 10-300 GeV energy
range is reported, for an extended source assuming the morphology of the
VERITAS detection. During on-peak phases, a sub-exponential cutoff is
significantly preferred (11 ) for representing the spectral
energy distribution, both in the phase-averaged and in the phase-resolved
spectra. Three glitches are detected during the observation period and we found
no flux variability at the time of the glitches or in the long-term behavior.
We also report the discovery of a previously unknown gamma-ray source in the
vicinity of PSR J0007+7303, Fermi J0020+7328, which we associate with the z =
1.781 quasar S5 0016+73. A concurrent analysis of this source is needed to
correctly characterize the behavior of CTA 1 and it is also presented in the
paper.Comment: 26 pages, 10 figures, 4 tables; Accepted for publication in Ap
CTA and cosmic-ray diffusion in molecular clouds
Molecular clouds act as primary targets for cosmic-ray interactions and are
expected to shine in gamma-rays as a by-product of these interactions. Indeed
several detected gamma-ray sources both in HE and VHE gamma-rays (HE: 100 MeV <
E 100 GeV) have been directly or indirectly associated with
molecular clouds. Information on the local diffusion coefficient and the local
cosmic-ray population can be deduced from the observed gamma-ray signals. In
this work we concentrate on the capability of the forthcoming Cherenkov
Telescope Array Observatory (CTA) to provide such measurements. We investigate
the expected emission from clouds hosting an accelerator, exploring the
parameter space for different modes of acceleration, age of the source, cloud
density profile, and cosmic ray diffusion coefficient. We present some of the
most interesting cases for CTA regarding this science topic. The simulated
gamma-ray fluxes depend strongly on the input parameters. In some cases, from
CTA data it will be possible to constrain both the properties of the
accelerator and the propagation mode of cosmic rays in the cloud.Comment: In Proceedings of the 2012 Heidelberg Symposium on High Energy
Gamma-Ray Astronomy. All CTA contributions at arXiv:1211.184
TeV Astronomy
With the successful realization of the current-generation of ground-based detectors, TeV Astronomy has entered into a new era. We review recent advances in VHE astronomy, focusing on the potential of Imaging Atmospheric Cherenkov Telescopes (IACTs), and highlight astrophysical implications of the results obtained within recent years
Unravelling the health effects of fasting : a long road from obesity treatment to healthy life span increase and improved cognition
In recent years a revival of interest has emerged in the health benefits of intermittent fasting and long-term fasting, as well as of other related nutritional strategies. In addition to meal size and composition a new focus on time and frequency of meals has gained attention. The present review will investigate the effects of the main forms of fasting, activating the metabolic switch from glucose to fat and ketones (G-to-K), starting 12-16 h after cessation or strong reduction of food intake. During fasting the deactivation of mTOR regulated nutrient signalling pathways and activation of the AMP protein kinase trigger cell repair and inhibit anabolic processes. Clinical and animal studies have clearly indicated that modulating diet and meal frequency, as well as application of fasting patterns, e.g. intermittent fasting, periodic fasting, or long-term fasting are part of a new lifestyle approach leading to increased life and health span, enhanced intrinsic defences against oxidative and metabolic stresses, improved cognition, as well as a decrease in cardiovascular risk in both obese and non-obese subjects. Finally, in order to better understand the mechanisms beyond fasting-related changes, human studies as well as non-human models closer to human physiology may offer useful clue
Very high energy gamma-ray follow-up observations of novae and dwarf novae with the MAGIC telescopes
In the last few years the Fermi-LAT instrument has detected GeV gamma-ray
emission from several novae. Such GeV emission can be interpreted in terms of
inverse Compton emission from electrons accelerated in the shock or in terms of
emission from hadrons accelerated in the same conditions. The latter might
reach much higher energies and could produce a second component in the
gamma-ray spectrum at TeV energies. We perform follow-up observations of
selected novae and dwarf novae in search of the second component in TeV energy
gamma rays. This can shed light on the acceleration process of leptons and
hadrons in nova explosions. We have performed observations with the MAGIC
telescopes of 3 sources, a symbiotic nova YY Her, a dwarf nova ASASSN-13ax and
a classical nova V339 Del, shortly after their outbursts. We did not detect TeV
gamma-ray emission from any of the objects observed. The TeV upper limits from
MAGIC observations and the GeV detection by Fermi constrain the acceleration
parameters for electrons and hadrons.Comment: Proceedings of the 34th International Cosmic Ray Conference, 30 July-
6 August, 2015, The Hague, The Netherlands. The content of this submission is
similar to our paper in the Fermi Symposium of novae observations with MAGIC,
which appeared as arXiv:1502.05853. arXiv admin note: substantial text
overlap with arXiv:1502.0585
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