Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Kalapotharakos, Constantinos"'
We develop kinetic plasma models of pulsar magnetospheres with magnetic-field-line-dependent plasma injection that reveal the importance of various magnetosphere regions in regulating the gamma-ray emission. We set different particle injection rates
Externí odkaz:
http://arxiv.org/abs/2303.04054
We explore the validity of the recently reported fundamental plane (FP) relation of gamma-ray pulsars using 190 pulsars included in the latest 4FGL-DR3 catalog. This sample number is more than twice as large as that of the original study. The FP rela
Externí odkaz:
http://arxiv.org/abs/2203.13276
Autor:
Barnard, Monica, Venter, Christo, Harding, Alice K., Kalapotharakos, Constantinos, Johnson, Tyrel J.
Recent kinetic simulations sparked a debate regarding the emission mechanism responsible for pulsed GeV $\gamma$-ray emission from pulsars. Some models invoke curvature radiation, while other models assume synchrotron radiation in the current-sheet.
Externí odkaz:
http://arxiv.org/abs/2111.03405
Air-Cherenkov telescopes have detected pulsations at energies above 50 GeV from a growing number of Fermi pulsars. These include the Crab, Vela, PSR B1706-44 and Geminga, with the first two having pulsed detections above 1 TeV. In some cases, there a
Externí odkaz:
http://arxiv.org/abs/2110.09412
Autor:
Fukumura, Keigo, Kazanas, Demosthenes, Shrader, Chris, Tombesi, Francesco, Kalapotharakos, Constantinos, Behar, Ehud
We analyze three prototypical black hole (BH) X-ray binaries (XRBs), \4u1630, \gro1655\ and \h1743, in an effort to systematically understand the intrinsic state transition of the observed accretion-disk winds between \windon\ and \windoff\ states by
Externí odkaz:
http://arxiv.org/abs/2103.05891
Modeling of the NICER X-ray waveform of the pulsar PSR J0030+0451, aimed to constrain the neutron star mass and radius, has inferred surface hot-spots (the magnetic polar caps) that imply significantly non-dipolar magnetic fields. To this end, we inv
Externí odkaz:
http://arxiv.org/abs/2009.08567
We show that the $\gamma$-ray pulsar observables, i.e., their total $\gamma$-ray luminosity, $L_{\gamma}$, spectral cut-off energy, $\epsilon_{\rm cut}$, stellar surface magnetic field, $B_{\star}$, and spin-down power $\dot{\mathcal{E}}$, obey a rel
Externí odkaz:
http://arxiv.org/abs/1904.01765
Autor:
Wadiasingh, Zorawar, Younes, George, Baring, Matthew G., Harding, Alice K., Gonthier, Peter L., Hu, Kun, van der Horst, Alexander, Zane, Silvia, Kouveliotou, Chryssa, Beloborodov, Andrei M., Prescod-Weinstein, Chanda, Chattopadhyay, Tanmoy, Chandra, Sunil, Kalapotharakos, Constantinos, Parfrey, Kyle, Blumer, Harsha, Kazanas, Demos
A next generation of Compton and pair telescopes that improve MeV-band detection sensitivity by more than a decade beyond current instrumental capabilities will open up new insights into a variety of astrophysical source classes. Among these are magn
Externí odkaz:
http://arxiv.org/abs/1903.05648
Pulsars emit pulsed emission across the entire electromagnetic spectrum and their light curve phenomenology is strongly dependent on energy. This is also true for the gamma-ray waveband. Continued detections by Fermi Large Area Telescope in the GeV b
Externí odkaz:
http://arxiv.org/abs/1811.11690
Pulsed emission from the Vela pulsar at energies above 3 TeV has recently been detected by the H.E.S.S. II air-Cherenkov telescope. We present a model for the broad-band spectrum of Vela from infra-red (IR) to beyond 10 TeV. Recent simulations of the
Externí odkaz:
http://arxiv.org/abs/1811.11157