Results 21 to 30 of about 1,887,037 (257)
Discovery of GeV Gamma-Ray Emission from Pulsar Wind Nebula Kes 75 and PSR J1846–0258
The Astrophysical Journal, 2023 We report the detection of gamma-ray emission from pulsar wind nebula (PWN) Kes 75 and PSR J1846−0258. Through modeling the spectral energy distribution incorporating the new Fermi-LAT data, we find that the observed gamma-ray emission is likely a ...
Samayra M. Straal +2 more
doaj +1 more source
Observing and Modeling the Gamma-Ray Emission from Pulsar/Pulsar Wind Nebula Complex PSR J0205+6449/3C 58 [PDF]
, 2017 We present the results of the analysis of eight years of Fermi-LAT data of the pulsar/pulsar wind nebula complex PSR J0205+6449/3C 58. Using a contemporaneous ephemeris, we carried out a detailed analysis of PSR J0205+6449 both during its off-peak and on-
Jian Li +6 more
semanticscholar +1 more source
EVOLUTION OF THE CRAB NEBULA RADIO EMISSION
Odessa Astronomical Publications, 2017 In 1977-1992 the flux density of the Crab Nebula in respect to Orion Nebula was measured at the frequency of 927 MHz with the same 10-m radio telescope.
E. N. Vinyajkin
doaj +1 more source
X-ray Emission from Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1997 X-ray emission from planetary nebulae (PNe) may originate from two sources: central stars which are 100,000–200,000 K will emit soft X-rays, and shocked fast stellar winds reaching 106–107 K will emit harder X-rays. The former are point sources, while the shocked winds are expected to be extended sources emitting continuously out to the inner wall of ...
Gail M. Conway, You-Hua Chu
openaire +1 more source
Backscattering and Line Broadening in Orion
The Astronomical Journal, 2022 Examination of emission lines in high-velocity-resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region.
C. R. O’Dell +2 more
doaj +1 more source
Emission Lines of Northern Planetary Nebulae [PDF]
Proceedings of the International Astronomical Union, 2016 AbstractIn this work, we present results of long slit spectrophotometric emission line flux observations of selected planetary nebulae (PNe). We have measured absolute fluxes and equivalent widths (EW) of all observable emission lines. In addition to these observations, electron temperatures (Te), densities (Ne), and chemical abundances were also ...
Aksaker, Nazim +3 more
openaire +3 more sources
The Antares emission nebula and mass loss of α Scorpii A [PDF]
, 2008 Aims. The Antares nebula is a peculiar emission nebula seen in numerous [Fe ii] lines and in radio free-free emission, probably associated with the H ii region caused by α Sco B in the wind of α Sco A. High-resolution spectra with spatial resolution were
D. Reimers, H. Hagen, R. Baade, K. Braun
semanticscholar +1 more source
The Astrophysical Journal, 2023 The Crab Pulsar is the prime example of an emitter of giant pulses. These short, very bright pulses are thought to originate near the light cylinder, at ∼1600 km from the pulsar.
Rebecca Lin +5 more
doaj +1 more source
The Astrophysical Journal Letters, 2022 We report the discovery of giant (50−100 kpc) [O ii ] emitting nebulae with MUSE in the field of TXS 0206−048, a luminous quasar at z = 1.13. “Down-the-barrel” UV spectra of the quasar show absorption at velocities coincident with those of the extended ...
Sean D. Johnson +12 more
doaj +1 more source
M 1–92 Revisited: New Findings and Open Questions: New NOEMA Observations of Minkowski’s Footprint
Galaxies, 2022 PN M 1–92, also known as Minkowski’s Footprint, is a textbook example of a massive pre-planetary nebula. It presents all the characteristics of this type of source: non-spherical symmetry (bipolar cylindrical symmetry in this case), high-velocity gas ...
Javier Alcolea +7 more
doaj +1 more source