scholarly journals The environmental dependence of neutral hydrogen content in spiral galaxies

2008 ◽  
Author(s):  
Jesse Miner ◽  
Jim Rose ◽  
Sheila Kannappan ◽  
Robert Minchin ◽  
Emmanuel Momjian
Keyword(s):  
Hydrogen Content ◽  
Spiral Galaxies ◽  
Neutral Hydrogen ◽  
Environmental Dependence

Low surface brightness spiral galaxies. I - Neutral hydrogen content and location in the infrared Fisher-Tully diagram

1982 ◽  
Vol 263 ◽  
pp. 94 ◽  
Author(s):  
W. Romanishin ◽  
N. Krumm ◽  
E. Salpeter ◽  
G. Knapp ◽  
K. M. Strom ◽  
...  
Keyword(s):  
Hydrogen Content ◽  
Surface Brightness ◽  
Spiral Galaxies ◽  
Neutral Hydrogen ◽  
Low Surface Brightness

scholarly journals Influence of Gravitational Lensing on Estimates of Ω in Neutral Hydrogen

1996 ◽  
Vol 173 ◽  
pp. 97-98
Author(s):  
Matthias Bartelmann ◽  
Abraham Loeb
Keyword(s):  
Observational Data ◽  
Gravitational Lensing ◽  
Column Density ◽  
Spiral Galaxies ◽  
Neutral Hydrogen ◽  
Absorption Lines ◽  
Gravitational Lenses ◽  
High Column

A wealth of observational data supports the commonly held view that damped Lyman-α (Lyα) absorption in QSO spectra is associated with neutral-hydrogen (HI) disks in spiral galaxies. Most of the HI probed by QSO absorption lines is traced by damped Lyα lines because of their high column densities, N > 1020 cm–2. The spiral galaxies hosting the HI disks can act as gravitational lenses on the QSOs. If the HI column density increases towards the center of the disks, as suggested by observations of local galaxies, the magnification bias preferentially selects for high column-density systems. The estimates of HI in damped Lyα systems can then systematically be distorted by gravitational lensing.

The Hi Neighborhoods Around STARBIRDS

2018 ◽  
Vol 14 (S344) ◽  
pp. 280-282
Author(s):  
Megan C. Johnson ◽  
Kristen B. W. McQuinn ◽  
John Cannon ◽  
Charlotte Martinkus ◽  
Evan Skillman ◽  
...  
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Spiral Galaxies ◽  
Dwarf Galaxies ◽  
Neutral Hydrogen ◽  
Tidal Interactions ◽  
Low Surface Brightness ◽  
The Galaxy ◽  
Green Bank Telescope ◽  
Intense Star Formation

AbstractStarbursts are finite periods of intense star formation (SF) that can dramatically impact the evolutionary state of a galaxy. Recent results suggest that starbursts in dwarf galaxies last longer and are distributed over more of the galaxy than previously thought, with star formation efficiencies (SFEs) comparable to spiral galaxies, much higher than those typical of non-bursting dwarfs. This difference might be explainable if the starburst mode is externally triggered by gravitational interactions with other nearby systems. We present new, sensitive neutral hydrogen observations of 18 starburst dwarf galaxies, which are part of the STARburst IRregular Dwarf Survey (STARBIRDS) and each were mapped with the Green Bank Telescope (GBT) and/or Parkes Telescope in order to study the low surface brightness gas distributions, a common tracer for tidal interactions.

scholarly journals The environmental dependence of neutral hydrogen in the gimic simulations

2014 ◽  
Vol 438 (3) ◽  
pp. 2530-2537 ◽  
Author(s):  
D. Cunnama ◽  
S. Andrianomena ◽  
C. M. Cress ◽  
A. Faltenbacher ◽  
B. K. Gibson ◽  
...  
Keyword(s):  
Neutral Hydrogen ◽  
Environmental Dependence

Spiral galaxies in clusters. II - Neutral hydrogen observations in Cancer, Hercules /A 2151/, and Pegasus I

1981 ◽  
Vol 86 ◽  
pp. 943 ◽  
Author(s):  
R. A. Schommer ◽  
W. T., III Sullivan ◽  
G. D. Bothun
Keyword(s):  
Spiral Galaxies ◽  
Neutral Hydrogen

Spiral galaxies in clusters. I - Neutral hydrogen observations in Abell 1367, Coma, and Zwicky 74-23 /1400.4 + 0949/

1981 ◽  
Vol 86 ◽  
pp. 919 ◽  
Author(s):  
W. T., III Sullivan ◽  
B. Bates ◽  
G. D. Bothun ◽  
R. A. Schommer
Keyword(s):  
Spiral Galaxies ◽  
Neutral Hydrogen

scholarly journals Observations of the Neutral Hydrogen in the Barred Spiral Galaxies NGC 3992 and NGC 4731

1983 ◽  
Vol 100 ◽  
pp. 235-236
Author(s):  
S. T. Gottesman ◽  
J. R. Ball ◽  
J. H. Hunter
Keyword(s):  
Radio Astronomy ◽  
Atomic Hydrogen ◽  
Spiral Galaxies ◽  
Neutral Hydrogen ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory ◽  
Barred Spiral Galaxies ◽  
Parameters Of Interest

We report observations of the atomic hydrogen properties of the barred spiral galaxies NGC 3992 and NGC 4731. These systems were observed in 1980 and 1981 with the VLA telescope of the National Radio Astronomy Observatory. In Table 1 we list the systemic parameters of interest.

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