Conveners
Stellar sources (galactic and extragalactic) III
- Martin Pohl (Universität Potsdam)
Spatially resolving pulsar wind nebulae (PWNe) and supernova remnants (SNRs) at GeV energies enables accurate representation of spectra, aids identification of multiwavelength counterparts, and probes possible substructure within the gamma-ray sources. Using 6 years of Fermi-LAT Pass 8 data above 10 GeV, we searched for spatially extended sources near the Galactic plane. The improved angular...
Although the Crab Nebula is one of the best-studied astrophysical sources, its extension in gamma-rays remained unknown until now. Measuring the size of the Crab Nebula in very high energy (VHE) gamma-rays provides important input on understanding the physics of this quite unusual pulsar wind nebula. The suspected extension is well below the angular resolution of Imaging Atmospheric Cherenkov...
Supernova remnants (SNRs) are believed to be one of the major sources of Galactic cosmic rays. SNR CTB 37A is known to interact with several dense molecular clouds as traced by OH 1720 MHz maser. Radio and X-ray observations of the SNR confirm a mixed-morphology classification of the remnant. The TeV γ-ray source HESS J1714-385 is positionally coincident with the SNR, though it is still not...
We compare the $\gamma$-ray spectrum available in literature from middle aged supernova remnants (SNRs) interacting with molecular clouds (MCs). We demonstrate the similarity in the shape of $\gamma$-ray spectra and then clarify a few points about the $\pi^0$-decay signatures claimed in a few SNRs. Next, we discuss the escaping scenario and direct interaction scenario, which have been proposed...
The very young Supernova remnant G1.9+0.3 is an interesting target for next generation gamma-ray observatories. So far the remnant is only detected in the radio and the X-ray bands but its young age and inferred shock speed of 14,000km/s should make it an efficient particle accelerator.
We carry out spherical symmetric 1-D simulations where we simultaneously solve the transport equations for...
A new extended gamma-ray source, which was named as ‘SourceA’, in the southwest of Galactic supernova remnant (SNR) G306.3−0.9 was detected with a significance of ~13σ at the location of R.A.(J2000) = 199.47 deg ± 0.07 deg and decl.(J2000) = −63.93 deg ± 0.07 deg using about 9 years of Fermi−LAT data. Showing the properties and detectability levels of non-TeV pulsar wind nebulae (PWNe),...
RX J1713.7−3946 is the poster-child cosmic-ray accelerator and is among the brightest X- and gamma-ray non-thermal emitters. Both the X-rays and the gamma-rays reveal a shell morphology that is brighter in the western half of the remnant where the shock is partly in interaction with dense clumps traced by $^{12}$CO radio observations.
Thanks to its high surface brightness and large angular...
