Results 91 to 100 of about 29,281 (217)

Tentative evidence of spatially extended GeV emission from SS433/W50

, 2019
We analyze 10 years of Fermi-LAT data towards the SS433/W50 region. With the latest source catalog and diffuse background models, the gamma-ray excess from SS433/W50 is detected with a significance of 6{\sigma} in the photon energy range of 500 MeV - 10 ...
Liu, Bing, Sun, Xiao-Na, Wang, Xiang-Yu, Xi, Shao-Qiang, Yang, Rui-Zhi   +4 more
core   +1 more source

The Green Monster Hiding in Front of Cas A: JWST Reveals a Dense and Dusty Circumstellar Structure Pockmarked by Ejecta Interactions

The Astrophysical Journal Letters
JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images—hence dubbed the Green Monster—that stretches across the central ...
Ilse De Looze, Dan Milisavljevic, Tea Temim, Danielle Dickinson, Robert Fesen, Richard G. Arendt, Jeremy Chastenet, Salvatore Orlando, Jacco Vink, Michael J. Barlow, Florian Kirchschlager, Felix D. Priestley, John C. Raymond, Jeonghee Rho, Nina S. Sartorio, Tassilo Scheffler, Franziska Schmidt, William P. Blair, Ori Fox, Christopher Fryer, Hans-Thomas Janka, Bon-Chul Koo, J. Martin Laming, Mikako Matsuura, Dan Patnaude, Mónica Relaño, Armin Rest, Judy Schmidt, Nathan Smith, Niharika Sravan   +29 more
doaj   +1 more source

Narrow Band Chandra X-ray Analysis of Supernova Remnant 3C391

, 2005
We present the narrow-band and the equivalent width (EW) images of the thermal composite supernova remnant (SNR) 3C391 for the X-ray emission lines of elements Mg, Si, & S using the Chandra ACIS Observational data.
Chen Y, Chen Y, Chevalier R A, Fabian R C, Fesen R A, Heger A, Hwang U, Hwang U, Hwang U, Laming J M, Park S, Park S, Reach W T, Reach W T, Wang L, Wilner D J, Yang Chen, Yang Su, Yusef-Zadeh F   +18 more
core   +2 more sources

Supernova Ia Remnants with M-dwarf Surviving Companions

The Astrophysical Journal
We study the possibility that Type Ia supernovae might be produced by binary systems where the companion of the exploding white dwarf is an M-dwarf star.
Kuo-Chuan Pan, Pilar Ruiz-Lapuente, Jonay I. González Hernández   +2 more
doaj   +1 more source

DO WE SEE THE ‘IRON PEAK’?

Acta Polytechnica, 2013
Recent measurements of the cosmic ray (CR) energy spectrum in the PeV region and above have confirmed the remarkable sharpness of the knee and revealed another structure at about 70PeV which we call the ‘Iron Peak’.
Anatoly D. Erlykin, Arnold W. Wolfendale
doaj   +1 more source

Constraints on the cosmic ray diffusion coefficient in the W28 region from gamma-ray observations

, 2010
GeV and TeV gamma rays have been detected from the supernova remnant W28 and its surroundings. Such emission correlates quite well with the position of dense and massive molecular clouds and thus it is often interpreted as the result of hadronic cosmic ...
Aharonian, F. A., Casanova, S., Gabici, S., Rowell, G.   +3 more
core   +1 more source

Historical Supernovae and Supernova Remnants [PDF]

International Astronomical Union Colloquium, 1996
The oldest historical supernova (SN), recorded by ancient Chinese in 14th Century B.C. on pieces of tortoise shells or bones, is identified with the aid of modern space γ-ray observations. Hard X-rays with energy up to 20 keV were observed from IC 443 by the X-ray satellite Ginga. We infer from these observations the age of IC 443 is ∼ 1000 — 1400 yrs.
openaire   +1 more source

Supernova Remnants and their Supernovae [PDF]

International Astronomical Union Colloquium, 1988
AbstractObserving supernova remnants provides important clues to the nature of supernova explosions. Conversely, the late stages of stellar evolution and the mechanism of supernova explosions affect supernova remnants through circumstellar matter, stellar remnants, and nucleosynthesis. The elements of supernova classification and the connection between
openaire   +1 more source

The Distance to the S147 Supernova Remnant

The Astrophysical Journal
In the absence of a parallax distance to a pulsar or a surviving binary in a supernova remnant (SNR), distances to Galactic SNRs are generally very uncertain.
C. S. Kochanek, John C. Raymond, Nelson Caldwell   +2 more
doaj   +1 more source

Excess gamma rays from the Loop I supernova remnant [PDF]

Evidence is presented for an excess of cosmic ray intensity within the Loop I supernova remnant based on an interpretation of the observed distribution of gamma-rays across the remnant and the column densities of the associated gas.
Bhat, C. L., Mayer, C. J., Wolfendale, A. W.   +2 more
core   +1 more source