Modified Gibbs state for an ideal atomic hydrogen gas

We present the first neutral atomic hydrogen (HI) gas images of QSO host galaxies. The results come from our ongoing survey of all twenty-three QSOs at redshifts z < 0.07 visible from the VLA. Our images show tidal interactions in all of the QSO host galaxies detected in HI, even when no such interactions are clearly visible in the optical. The results are not consistent with the suggestion by Sanders et al. (1988a, 1988b) that ultraluminous infrared galaxies, the vast majority of which are later-stage mergers, are the parent population of a significant fraction of radio-quiet QSOs. Instead, our results suggest that QSOs reside in a wide variety of interacting environments.

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Thermal conductivity and accommodation coefficient of spin-polarized atomic-hydrogen gas

Physical Review B ◽

10.1103/physrevb.52.7215 ◽

1995 ◽

Vol 52 (10) ◽

pp. 7215-7229 ◽

Cited By ~ 2

Author(s):

M. J. Yoo ◽

T. J. Greytak

Keyword(s):

Thermal Conductivity ◽

Atomic Hydrogen ◽

Accommodation Coefficient ◽

Hydrogen Gas ◽

Spin Polarized

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Cryogenic 2 mm wave electron spin resonance spectrometer with application to atomic hydrogen gas below 100 mK

Review of Scientific Instruments ◽

10.1063/1.1633006 ◽

2004 ◽

Vol 75 (1) ◽

pp. 94-98 ◽

Cited By ~ 35

Author(s):

Sergei Vasilyev ◽

Jarno Järvinen ◽

Esa Tjukanoff ◽

Alexander Kharitonov ◽

Simo Jaakkola

Keyword(s):

Electron Spin Resonance ◽

Electron Spin ◽

Atomic Hydrogen ◽

Hydrogen Gas ◽

Spin Resonance ◽

Electron Spin Resonance Spectrometer

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Three-body recombination in two-dimensional atomic hydrogen gas

Physical Review A ◽

10.1103/physreva.72.052713 ◽

2005 ◽

Vol 72 (5) ◽

Cited By ~ 15

Author(s):

J. Järvinen ◽

J. Ahokas ◽

S. Jaakkola ◽

S. Vasilyev

Keyword(s):

Atomic Hydrogen ◽

Hydrogen Gas ◽

Two Dimensional ◽

Three Body ◽

Body Recombination

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The SFR Efficiency of HI Gas in the Outskirts of Star Forming Galaxies

Proceedings of the International Astronomical Union ◽

10.1017/s1743921316009236 ◽

2016 ◽

Vol 11 (S321) ◽

pp. 360-362

Author(s):

Marc Rafelski

Keyword(s):

Star Formation ◽

Atomic Hydrogen ◽

Rest Frame ◽

Star Formation Rate ◽

Formation Rate ◽

Hydrogen Gas ◽

Star Forming ◽

Uv Emission ◽

Atomic Gas

AbstractIn order to understand the origin of the decreased star formation rate (SFR) efficiency of neutral atomic hydrogen gas measured in Damped Lyα Systems (DLAs) at z ~ 3, we measure the SFR efficiency of atomic gas at z ~ 1, z ~ 2, and z ~ 3 around star-forming galaxies. We create galaxy stacks in these three redshift bins, and measure the SFR efficiency by combining DLA absorber statistics with the observed rest-frame UV emission in the galaxies’ outskirts. We find that the SFR efficiency of Hi gas is ~ 3% of that predicted by the KS relation. We find no significant evolution in the SFR efficiency with redshift, although simulations and models predict a decreasing SFR efficiency with decreasing metallicity and thus with increasing redshift. We discuss possible explanations for this decreased efficiency without an evolution with redshift.

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