molecular gas towards the north-east (NE) of the W28 supernova remnant (SNR). This cloud is spatially well-matched to the TeV gamma-ray source HESS J1801-233 and is known to be a SNR-molecular cloud interaction region." Fermi sources associated with this object: - 1FGL J1801.3-2322c and 1FGL J1800.5-2359c Source Morphology: This SNR has a mixed ...

2018年5月9日 · Supernova remnant (SNR)\,W28 is well known for its classic hadronic scenario, in which the TeV cosmic rays (CRs) released at the early stage of this mid-aged SNR are illuminating nearby molecular clouds (MCs). Overwhelming evidences have shown that the northeast of the SNR (W28-North) has already encountered with the MC clumps.

W28 is an old-age(>104 years, see [1, 2, 3]) supernovaremnant (SNR), which exhibits non-thermalsynchrotronemis-sion seen in 90cm radio continuum in Figure1. The W28 SNR has been implicated as a cosmic ray (CR) accelerator due to a correspondence between TeV gamma-ray emission and molecular gas at a distance of 1.2-3.3kpc [4, 5, 6, 7].

2014年7月30日 · We have performed an XMM-Newton imaging and spectroscopic study of supernova remnant (SNR) W28, a prototype mixed-morphology or thermal composite SNR believed to be interacting with a molecular cloud. The observed hot X-ray emitting plasma is characterized by low metal abundances, showing no evidence of ejecta.

2024年5月6日 · Mazumdar et al. revealed the formation of H 2 CO and CH 3 OH in the shocked region of the SNR W28. However, observational study of shock chemistry is still scarce, and further investigations are needed. Meanwhile, SNR shocks are believed to be the prime accelerators of Galactic CRs following the diffuse shock acceleration process (Bell 1978).

1999年11月30日 · The southern supernova remnant (SNR)W28 was observed in 1994 and 1995 by the CANGAROO 3.8m telescope in a search formulti-TeV gamma ray emission, using the Cerenkov imaging technique.

We present a detailed investigation of the γ -ray emission in the vicinity of the supernova remnant (SNR) W28 (G6.4−0.1) observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope.

2018年12月1日 · We here examined the implications of two different maximum energies that may be achieved by cosmic rays in SNR W28 on TeV gamma rays and neutrinos from the four molecular clouds, H.E.S.S. J1800-240A, J1800-240B, J1800-240C and H.E.S.S. J1801-233 illuminated by W28 emitted cosmic rays.

We present new VLA images at 328 and 1415 MHz of the supernova remnant (SNR) W28. The image at 1415 MHz, produced after the combination of 50 separate VLA pointings and the addition of single-dish data, has an angular resolution …

1999年11月30日 · The southern supernova remnant (SNR)W28 was observed in 1994 and 1995 by the CANGAROO 3.8m telescope in a search formulti-TeV gamma ray emission, using the Cerenkov imaging technique.