Results 1 to 10 of about 43,858 (281)

Anomalous Neutral Hydrogen Column Densities in Local Interstellar Medium Clouds

The Astrophysical Journal
Analysis of high-resolution spectra of the hydrogen and deuterium Ly α lines provides measurements of interstellar neutral hydrogen column densities N (H i ) to 113 stars within 50 pc of the Sun. Plots of N (H i ) versus distance through the LIC, G, Mic,
Jeffrey L. Linsky, Seth Redfield
doaj   +2 more sources

The Origin of Neutral Hydrogen Clouds in Nearby Galaxy Groups: Exploring the Range Of Galaxy Interactions [PDF]

The Astronomical Journal, 2011
We combine high resolution N-body simulations with deep observations of neutral hydrogen (HI) in nearby galaxy groups in order to explore two well-known theories of HI cloud formation: HI stripping by galaxy interactions and dark matter minihalos with ...
Abraham, Bahcall, Barentine, Bell, Berrier, Bureau, Chemin, Chynoweth, Chynoweth, Chynoweth, Combes, Conselice, D'Onghia, Emil Polisensky, Fouque, Fraternali, Fukugita, Glen I. Langston, Gnedin, Hess, Hummel, Katie M. Chynoweth, Kelly Holley-Bockelmann, Kennicutt, Kennicutt, Kereš, Knapen, Knollmann, Kravtsov, Kuo, Langston, Laurikainen, Lockman, Lockman, Lotz, Miller, Mulder, Muller, Ott, Patton, Patton, Pisano, Putman, Schwarz, Shull, Simon, Simon, Strickland, Thilker, Thom, Wakker, Wakker, Westmeier, Zwaan   +53 more
core   +2 more sources

On the Stability of Interstellar Neutral Hydrogen Clouds at Large Z-heights

The Astrophysical Journal
Galactic neutral hydrogen (H i ) data drawn from several large-scale surveys have been used to study 32 small clouds found between Galactic longitudes 70° and 140° and latitudes −20° and −45°.
G. L. Verschuur
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Properties of Neutral Hydrogen Clouds [PDF]

Symposium - International Astronomical Union, 1974
In the region +19° <b< +30°, 122° <l< 143°, 21-cm line profiles were analyzed into Gaussian components, and these components combined into clouds, by means of computerized procedures. Maps of some of the clouds so defined are presented, and their properties discussed. Many clouds are elongated and/or irregular in shape.
Ulrich J. Schwarz, Hugo van Woerden
openaire   +1 more source

Neutral Hydrogen in the Magellanic Clouds [PDF]

Symposium - International Astronomical Union, 1999
We review observations of neutral atomic hydrogen (HI) in the Magellanic Clouds (MCs). Being the nearest gas-rich neighbours of the Milky Way the MCs give us an excellent opportunity to study in detail the structure and evolution of the interstellar medium (ISM) and the effect of interactions between galaxies.
L. Staveley-Smith, S. Kim, S. Stanimirović   +2 more
openaire   +1 more source

H i Absorption in Low-power Radio AGNs Detected by FAST

The Astrophysical Journal, 2023
We report the discovery of three H i absorbers toward low-power radio active galactic nuclei (AGNs) in a pilot H i absorption survey with the Five-hundred-meter Aperture Spherical radio Telescope (FAST).
Qingzheng Yu, Taotao Fang, Junfeng Wang, Jianfeng Wu   +3 more
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Black holes, stationary clouds and magnetic fields

Physics Letters B, 2021
As the electron in the hydrogen atom, a bosonic field can bind itself to a black hole occupying a discrete infinite set of states. When (i) the spacetime is prone to superradiance and (ii) a confinement mechanism is present, some of such states are ...
Nuno M. Santos, Carlos A.R. Herdeiro
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FEASTS: IGM Cooling Triggered by Tidal Interactions through the Diffuse H i Phase around NGC 4631

The Astrophysical Journal, 2023
We use the single-dish radio telescope Five-hundred meter Aperture Spherical Telescope (FAST) to map the H i in the tidally interacting NGC 4631 group with a resolution of 3.′24 (7 kpc), reaching a 5 σ column density limit of 10 ^17.9 cm ^−2 assuming a ...
Jing Wang, Dong Yang, S-H. Oh, Lister Staveley-Smith, Jie Wang, Q. Daniel Wang, Kelley M. Hess, Luis C. Ho, Ligang Hou, Yingjie Jing, Peter Kamphuis, Fujia Li, Xuchen Lin, Ziming Liu, Li Shao, Shun Wang, Ming Zhu   +16 more
doaj   +1 more source

Neutral hydrogen in the Large Magellanic Cloud [PDF]

Symposium - International Astronomical Union, 1964
The neutral hydrogen gas in the Large Magellanic Cloud has been observed with the 14′.5 beam of the Parkes 210-foot telescope and the 48-channel H-line receiver. We wish to present a progress report based on computer reductions of integrated brightness and median radial velocities for some 4200 profiles.
R. X. McGee, Janice A. Milton
openaire   +1 more source

Topology of Neutral Hydrogen within the Small Magellanic Cloud [PDF]

The Astrophysical Journal, 2008
In this paper, genus statistics have been applied to an HI column density map of the Small Magellanic Cloud in order to study its topology. To learn how topology changes with the scale of the system, we provide the study of topology for column density maps at varying resolution.
Chepurnov, A., Lazarian, A., Gordon, J., Stanimirovic, S.   +3 more
openaire   +2 more sources