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Observations of feedback from radio-quiet quasars – II. Kinematics of ionized gas nebulae [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 The prevalence and energetics of quasar feedback is a major unresolved problem in galaxy formation theory. In this paper, we present Gemini Integral Field Unit observations of ionized gas around eleven luminous, obscured, radio-quiet quasars at z~0.5 out
Guilin Liu +2 more
exaly +3 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
doaj +1 more source
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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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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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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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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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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Planetary Nebulae and the Ionization of the Interstellar Medium in Galaxies
Frontiers in Astronomy and Space Sciences, 2022 We discuss the role of planetary nebulae and their progeny in galaxy context in terms of ionization of the galaxy interstellar medium. This regards ionized gas outside the disk of spiral galaxies, the diffuse ionized medium in spiral galaxies, and the ...
Grażyna Stasińska +2 more
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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
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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
doaj +1 more source