Dense Cloud

2015 ◽  
pp. 625-625
Author(s):  
William M. Irvine
Keyword(s):  
Dense Cloud

scholarly journals Growth and structure of multiphase gas in the cloud-crushing problem with cooling

2020 ◽  
Vol 501 (1) ◽  
pp. 1143-1159
Author(s):  
Vijit Kanjilal ◽  
Alankar Dutta ◽  
Prateek Sharma
Keyword(s):  
Mixing Layer ◽  
Cooling Time ◽  
Radiative Cooling ◽  
Late Time ◽  
Dense Gas ◽  
Mixed Gas ◽  
Continuous Growth ◽  
Dense Cloud ◽  
Set Up ◽  
Background Gas

ABSTRACT We revisit the problem of the growth of dense/cold gas in the cloud-crushing set-up with radiative cooling. The relative motion between the dense cloud and the diffuse medium produces a turbulent boundary layer of mixed gas with a short cooling time. This mixed gas may explain the ubiquity of the range of absorption/emission lines observed in various sources such as the circumgalactic medium and galactic/stellar/active galactic nucleus outflows. Recently, Gronke & Oh showed that the efficient radiative cooling of the mixed gas can lead to continuous growth of the dense cloud. They presented a threshold cloud size for the growth of dense gas that was contradicted by the more recent works of Li et al. & Sparre et al. These thresholds are qualitatively different as the former is based on the cooling time of the mixed gas whereas the latter is based on the cooling time of the hot gas. Our simulations agree with the threshold based on the cooling time of the mixed gas. We argue that the radiative cloud-crushing simulations should be run long enough to allow for the late-time growth of the dense gas due to cooling of the mixed gas but not so long that the background gas cools catastrophically. Moreover, the simulation domain should be large enough that the mixed gas is not lost through the boundaries. While the mixing layer is roughly isobaric, the emissivity of the gas at different temperatures is fundamentally different from an isobaric single-phase steady cooling flow.

Illness and Death in the Era of Neoabsolutism: New Perspectives on Liberal-Catholic Conflict from 1850s Upper Austria

2007 ◽  
Vol 38 ◽  
pp. 122-144 ◽  
Author(s):  
Max H. Vögler
Keyword(s):  
Dense Cloud ◽  
Upper Austria ◽  
The People

On 8 March 1849, Upper Austria's first liberal governor, Alois Fischer, stood on the balcony of the Rathaus in Linz's market square and proclaimed the closing of the democratically elected Austrian Reichstag in Kremsier. The newly crowned emperor, Francis Joseph, had written in the proclamation that Fischer now read to the crowd that the Reichstag delegates took too long in their deliberations, wasting time on “dangerous theoretical discussions.” Their labors had become redundant, and the emperor would decree his own constitution. After reciting the imperial proclamation, Fischer retired to the side and let his assistant read out the new constitution. Named after its principal architect, Minister of the Interior Franz Stadion, the new “Stadion” constitution was mildly liberal, although, unlike its unfinished predecessor, it was wholly unambiguous when it came to the monarch: his powers were immense and—the document made sure to point out—derived from God, not from the people. In practice, the constitution was mostly ignored. Fittingly perhaps, those assembled in front of the Rathaus that day could barely make out what was being said. As one participant described the scene, the wind was so strong “that our neighbors disappeared in the dust.” The return of absolutist government thus came to Linz unintelligibly, wrapped in a dense cloud of dust.

Interstellar Line Spectra of a Dense Cloud: The VI Cygni Association

1980 ◽  
pp. 261-262
Author(s):  
Steven P. Souza ◽  
Barry L. Lutz
Keyword(s):  
Dense Cloud

Dense cloud chemistry

1982 ◽  
Vol 87 (1-2) ◽  
pp. 435-453 ◽  
Author(s):  
T. J. Millar
Keyword(s):  
Cloud Chemistry ◽  
Dense Cloud

A bipolar outflow - L1641-north and its ambient dense cloud

1988 ◽  
Vol 325 ◽  
pp. L13 ◽  
Author(s):  
Y. Fukui ◽  
H. Takaba ◽  
T. Iwata ◽  
A. Mizuno
Keyword(s):  
Dense Cloud ◽  
Bipolar Outflow

C18O Observations of the Dense Cloud Cores and Star Formation in Ophiuchus

2000 ◽  
Vol 528 (2) ◽  
pp. 817-840 ◽  
Author(s):  
Kengo Tachihara ◽  
Akira Mizuno ◽  
Yasuo Fukui
Keyword(s):  
Star Formation ◽  
Dense Cloud ◽  
Cloud Cores
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