Results 1 to 10 of about 590 (185)
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 ...
Nazim Aksaker, Sinan K Yerli
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Emission-Line Fluxes of Northern Planetary Nebulae [PDF]
Publications of the Astronomical Society of Australia, 2015 AbstractWe present long slit spectrophotometric emission line fluxes of bright and extended (< 5 arcsec in diameter) planetary nebulae (PNe), selected from a catalogue with suitable equatorial coordinates for northern hemisphere. In total, 17 planetary nebulae have been chosen and observed in 2008–2010.
Nazim Aksaker, Sinan K Yerli
exaly +5 more sources
The Astrophysical Journal, 2023 We have studied the evolution of HuBi 1–like planetary nebulae, considering several stages of mass injection. We have carried out numerical ionization+1D hydrodynamics+atomic/ionic rate models with our code Coral1d to reproduce planetary nebulae that ...
Ary Rodríguez-González +6 more
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The Luminosity–Area Relation of z > 2 Quasars’ Lyα Nebulae
The Astrophysical Journal Letters, 2023 Cool ( T ∼ 10 ^4 K) gas is commonly observed around z > 2 quasars as traced by extended Ly α emission. These large-scale nebulae are usually studied using circularly averaged surface-brightness profiles, which suppress information on morphological ...
Fabrizio Arrigoni Battaia +4 more
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SiO Emission from the Orion Nebula [PDF]
Symposium - International Astronomical Union, 1980 SiO emission in both a strong maser transition in the first excited vibrational state and in a weaker transition in the ground vibrational state both arise from the same small region in the Kleinmann-Low Nebula in Orion. Within the errors, the source position coincides with that of the infrared source IRc2.
B. Baud +5 more
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Radio Continuum Spectra of Planetary Nebulae
Galaxies, 2018 Radio continuum emission of planetary nebulae is a rich source of information about their structure and physical parameters. Although radio emission is well studied, planetary nebulae show higher spectral indices than expected for homogeneous sphere.
Marcin Hajduk +6 more
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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
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Modelling the ArH+ emission from the Crab nebula [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 Abstract We have performed combined photoionization and photodissociation region (PDR) modelling of a Crab nebula filament subjected to the synchrotron radiation from the central pulsar wind nebula, and to a high flux of charged particles; a greatly enhanced cosmic-ray ionization rate over the standard interstellar value, ζ0, is required
F. D. Priestley, M. J. Barlow, S. Viti
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X-ray Observations of Planetary Nebulae since WORKPLANS I and Beyond
Galaxies, 2020 Planetary nebulae (PNe) were expected to be filled with hot pressurized gas driving their expansion. ROSAT hinted at the presence of diffuse X-ray emission from these hot bubbles and detected the first sources of hard X-ray emission from their central ...
Martín A. Guerrero
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When the Stars Align: A 5σ Concordance of Planetary Nebulae Major Axes in the Center of Our Galaxy
The Astrophysical Journal Letters, 2023 We report observations of a remarkable major axes alignment nearly parallel to the Galactic plane of 5 σ significance for a subset of bulge “planetary nebulae” (PNe) that host, or are inferred to host, short-period binaries. Nearly all are bipolar. It is
Shuyu Tan +4 more
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